CN107401655B

CN107401655B - Metal pipe line defect recognition and no-welding method for maintaining

Info

Publication number: CN107401655B
Application number: CN201610342273.3A
Authority: CN
Inventors: 梁爱国; 王庆林; 蒋华义; 王玉龙
Original assignee: China Petroleum and Natural Gas Co Ltd; Xian Shiyou University
Current assignee: China Petroleum and Natural Gas Co Ltd; Xian Shiyou University
Priority date: 2016-05-20
Filing date: 2016-05-20
Publication date: 2019-05-07
Anticipated expiration: 2036-05-20
Also published as: CN107401655A

Abstract

The present invention provides a kind of metal pipe line defect recognition and no-welding method for maintaining, wherein this method includes establishing damage data table, in the functional relation established between damage regime and safe construction pressure in damage data table；The damage regime for being detected by damage regime of the detection device to pipeline, and being determined after being detected according to detection device determines the safe construction pressure of pipeline by inquiry damage data table；According to the safe construction pressure and the compatible seal clamp of damage regime selection after determination；Seal clamp is mounted on to the injury region of pipeline, and makes to form cavity between seal clamp and the outer wall of pipeline；Sealant is injected into cavity by glue filling device, maintenance is sealed with the injury region to pipeline, the pressure that sealant generates in cavity is less than safe construction pressure.This method efficiently solves the problems, such as that the sealant of injection causes secondary damage to pipeline so that pipeline can not be repaired.

Description

Metal pipe line defect recognition and no-welding method for maintaining

Technical field

The present invention relates to oil field pipe breakages to leak maintenance technique field, in particular to a kind of metal pipe line defect Identification and no-welding method for maintaining.

Background technique

Pipeline maintenance method in the prior art generally requires to carry out halt production maintenance and replacement, and maintenance difficulty is big, when consuming Between it is long, and once get angry, easily cause safety accident.Stop production to overhaul can also bring additional economic loss because of damp production.Cause Piping failure caused by oil, feed channel inner wall corrosion or fouling etc. during the daily production run in this oil field, frequently with not getting angry Agent injecting type on-line pressure sealant technology repair.The technology uses special seal clamp, and one is rebuild on leakage position newly Sealing structure, promptly make up leakage defect, reach and medium is prevented to leak, realize the purpose of sealing, Applicable media temperature and Pressure limit is wider, and plugging operations are relatively simple, at home and abroad obtains extensive promotion and application.

When agent injecting type on-line pressure sealant technology construction application, the internal pressure that fixture is born is the system pressure leaked into sealing cavity Power and the resultant force for completing the sealant extruding force sealed, and pipeline can be born from sealant extruding force and pipe in fixture injecting glue slot The collective effect of road ontology and system pressure.Wherein, system pressure is with Uniform Loads on pipeline, and sealed extruded power is It is injected into sealing cavity by multiple injecting holes.Each injecting hole nearby bears sealant and flows, fills up, is compacted overall process, The extruding force that each injecting hole is showed is different.If the external thrust of injecting is excessive, or control is improper, then to pipeline Great additional stress is generated, leading to pipeline, deformation occurs or rupture, causes the destruction of unrepairable.In addition, daily in oil field During production run, oil, gas metallic conduit due to long-play and convey the strong fluid media (medium) of high temperature, high pressure, corrosivity, Inner and outer walls of pipeline corrosion or fouling are easily caused, and then there is a phenomenon where trommel or perforation, is brought much to site operation Uncertain factor.

Summary of the invention

The main purpose of the present invention is to provide a kind of metal pipe line defect recognition and no-welding method for maintaining, existing to solve Have in technology since the pressure of injection sealant controls improper the problem of causing pipeline unrepairable.

To achieve the goals above, according to an aspect of the invention, there is provided a kind of metal pipe line defect recognition and exempting from Weld method for maintaining, comprising: establish damage data table, establishing between damage regime and safe construction pressure in damage data table Functional relation；The damage for being detected by damage regime of the detection device to pipeline, and being determined after being detected according to detection device Hurt operating condition, the safe construction pressure of pipeline is determined by inquiry damage data table；According to after determination safe construction pressure and Damage regime chooses compatible seal clamp；Seal clamp is mounted on to the injury region of pipeline, and makes seal clamp and pipeline Outer wall between form cavity；Sealant is injected into cavity by glue filling device, dimension is sealed with the injury region to pipeline It repairs, the pressure that sealant generates in cavity is less than safe construction pressure.

Further, damage regime includes material type, the type of impairment of pipeline and the injury region and seal clamp of pipeline The distance between injecting glue slot；When establishing damage data table, by the material type, the type of impairment of pipeline and injury region of pipeline The distance between injecting glue slot of seal clamp is fitted to obtain safe construction pressure.

Further, type of impairment includes poroid damage, and safe construction pressure Psafe is obtained by following formula:

Psafe=157.05519-31.10771*ln (r+74.249),

Wherein, the unit of safe construction pressure Psafe is MPa, and the injury region of pipeline is cavernous structure, and r is cavernous structure Radius, unit mm.

Psafe=247.00606-52.10033*ln (r+65.39911),

Further, type of impairment includes the axial crack damage of the axial direction along pipeline, safe construction pressure Psafe It is obtained by following formula:

Psafe=25.55345-4.34022*ln (r-2.47777),

Wherein, the unit of safe construction pressure Psafe is MPa, and r is the damaged length of the injury region of pipeline.

Further, type of impairment includes the circumferential crack damage of the circumferential direction along pipeline, safe construction pressure Psafe It is obtained by following formula:

Psafe=23.80073-3.32896*ln (r-3.54268),

Further, temperature when sealant injection cavity is T1, wherein 0 T1≤800 DEG C <.

Further, the use pressure of sealant is P1, wherein P1≤60MPa.

Further, the temperature before sealant injection cavity is T2, wherein 90 DEG C≤T2≤120 DEG C.

Further, the pressure of glue filling device towards push sealant in cavity is P2, and, P3≤P2≤70%P4, In, P3 is the rated pressure of pipeline；P4 is safe construction pressure.

Further, detection device includes supersonic detector and sonigauge, as 5mm≤δ, using ultrasonic wave Defectoscope detects pipeline, as δ < 5mm, is detected using sonigauge to pipeline, wherein δ is pipeline Wall thickness.

Further, seal clamp includes in flange fixture, single grooved ring shape fixture, double flute fixture or rectangular box-like fixture It is at least one.

It applies the technical scheme of the present invention, metal pipe line defect recognition and no-welding method for maintaining, this method include establishing Damage data table, in the functional relation established in damage data table between damage regime and safe construction pressure.It is filled by detection The damage regime set and detected to the damage regime of pipeline, and determine after being detected according to detection device damages number by inquiry The safe construction pressure of pipeline is determined according to table.According to after determination safe construction pressure and damage regime choose it is compatible close Fixture is sealed, seal clamp is mounted on to the injury region of pipeline, and make to form cavity between seal clamp and the outer wall of pipeline.Pass through Glue filling device injects sealant into cavity and is sealed maintenance, the pressure that sealant generates in cavity with the injury region to pipeline Power is less than safe construction pressure.This method is efficiently solved causes the pressure of sealant much big because blindness injects sealant In the safe construction pressure of damage pipeline, so that the sealant of injection further causes secondary damage to pipeline so that pipeline can not The problem of repairing.

Detailed description of the invention

The accompanying drawings constituting a part of this application is used to provide further understanding of the present invention, and of the invention shows Examples and descriptions thereof are used to explain the present invention for meaning property, does not constitute improper limitations of the present invention.In the accompanying drawings:

Fig. 1 shows the process of the embodiment of metal pipe line defect recognition according to the present invention and no-welding method for maintaining Figure；

Fig. 2 shows the explorations of the leak scene of metal pipe line defect recognition according to the present invention and no-welding method for maintaining The flow chart of embodiment；

Fig. 3 shows the flow chart of the evaluation of programme of risk assessment software according to the present invention；

Fig. 4 shows the flow chart of metal pipe line defect recognition according to the present invention and no-welding method for maintaining；

Fig. 5 shows the structural schematic diagram of the first seal clamp according to the present invention；

Fig. 6 shows the structural schematic diagram at another visual angle of the first seal clamp according to the present invention；

Fig. 7 shows the structural schematic diagram of the second seal clamp according to the present invention；

Fig. 8 shows the structural schematic diagram at another visual angle of the second seal clamp according to the present invention；

Fig. 9 shows the structural schematic diagram of third seal clamp according to the present invention；

Figure 10 shows the structural schematic diagram at another visual angle of third seal clamp according to the present invention；

Figure 11 shows the structural schematic diagram of the 4th seal clamp according to the present invention；

Figure 12 shows the knot of the embodiment one sealed according to the present invention using single slot seal clamp to straight pipe injury region Structure schematic diagram；

Figure 13 shows the knot of the embodiment two sealed according to the present invention using single slot seal clamp to straight pipe injury region Structure schematic diagram；

Figure 14 shows the knot of the embodiment one sealed according to the present invention using double flute seal clamp to straight pipe injury region Structure schematic diagram；And

Figure 15 shows the knot of the embodiment two sealed according to the present invention using double flute seal clamp to straight pipe injury region Structure schematic diagram.

Wherein, the above drawings include the following reference numerals:

10, seal clamp；11, injecting hole；12, threaded hole；20, injecting glue slot；30, flange；40, bolt otic placode；50, threeway Pipe；60, elbow；70, pipeline.

Specific embodiment

It should be noted that in the absence of conflict, the features in the embodiments and the embodiments of the present application can phase Mutually combination.The present invention will be described in detail below with reference to the accompanying drawings and embodiments.

As shown in Figures 1 to 4, embodiment according to the present invention one provides a kind of metal pipe line defect recognition and exempts to weld Connect method for maintaining.This method includes establishing damage data table, and damage regime and safe construction pressure are established in damage data table Between functional relation.It is detected by damage regime of the detection device to pipeline, and is determined after being detected according to detection device Damage regime, by inquiry damage data table to determine the safe construction pressure of pipeline.According to the safe construction pressure after determination Power and damage regime choose compatible seal clamp, and seal clamp is mounted on to the injury region of pipeline, and make seal clamp with Cavity is formed between the outer wall of pipeline.Sealant is injected into cavity by glue filling device to be sealed with the injury region to pipeline Maintenance, the pressure that sealant generates in cavity are less than safe construction pressure.

In the present embodiment, this method, which is efficiently solved, leads to the pressure of sealant much because blindness injects sealant Greater than damage pipeline safe construction pressure so that injection sealant secondary damage further is caused to pipeline so that pipeline without The problem of method is repaired.The effect of sealing is not achieved since the pressure of the sealant of injection is too small.The metal tube of the technical program Line defect identification and no-welding method for maintaining, which pass through the safe construction pressure simulated, can be good at control injection sealant The safety and success rate of construction is effectively guaranteed so that the sealing effect of the sealant of injection is just right in pressure.

Further, damage regime includes material type, the type of impairment of pipeline and the injury region and seal clamp of pipeline The distance between injecting glue slot.When establishing damage data table, by the material type, the type of impairment of pipeline and injury region of pipeline The distance between injecting glue slot of seal clamp is fitted to obtain safe construction pressure.This method can find rapidly oil gas For the pipelines such as pipeline station, refinery factory and long-distance transport pipes because of the defects of corroding thinning or leakage, it is accurately fixed to carry out to defective locations The quick detection recognition method of position, and a set of no-welding dimension emergency repair method with pressure is provided, to overcome existing maintenance technique to there is peace Full hidden danger, the problem of blindness deficiency.This method can preferably meet live emergency demand, guarantee the success rate of sealing operation, Safety repairs emergency pipe line in time, guarantees that production safety carries out.

Wherein, safe construction pressure Psafe is obtained by following formula:

Psafe=157.05519-31.10771*ln (r+74.249),

The unit of safe construction pressure Psafe is MPa, and the injury region of pipeline is cavernous structure, and r is the half of cavernous structure Diameter, unit mm.If the ratio of the wall thickness δ of the caliber D and pipeline of pipeline is 168/5, pipeline internal pressure P, that is, pipeline performance of pipeline Pressure is 6.4MPa, when type of impairment includes that poroid damage is circular hole perforation, by the way that damage data table is woven into risk The data of relevant parameter are carried out lesion mimic by risk assessment software to measure the pipeline under various operating conditions by evaluation software Safe construction pressure show the safe construction pressure that simulates by damage data as shown in table 1 below and applied by safety The error condition of work pressure formula calculating safe construction pressure.

Table 1

Circle hole radius/mm	2.5	5	7.5	10	12.5	15	20
								Simulation results P/MPa	21.5	21.5	20	19	19	18	16
Formula calculated result P/MPa	22	21	20.1	19.1	18.2	17.3	15.6
								Error %	2.3	2.3	0.5	0.5	4.1	3.9	2.5

The error that table 1 shows simulation results and formula calculated result under different circular hole lesion sizes is smaller, That is the calculating structure difference of the two is very small, and the accuracy of safe construction calculation of pressure is effectively improved using this method.

Again as shown in table 2, defective form is still circular hole, when caliber is 89mm, wall thickness 4mm, operating pressure 1.6MPa When, safe construction pressure Psafe is obtained by following formula:

Psafe=247.00606-52.10033*ln (r+65.39911),

Simulation results and formula calculated result are as shown in table 2:

Table 2

Circle hole radius/mm	2.5	5	7.5	10	12.5	15	20
								Simulation results P/MPa	26	26	26	21	19	18.6	14.5
Formula calculated result P/MPa	27.2	25.4	23.5	21.8	20.1	18.4	15.3
								Error %	4.6	2.3	9.6	3.8	5.8	1.0	5.5

Defective form is axial crack, and as caliber 168mm, wall thickness 5mm, operating pressure 6.4MPa, pipeline internal pressure P is 6.4MPa, safe construction pressure Psafe are obtained by following formula:

Psafe=25.55345-4.34022*ln (r-2.47777),

Wherein, the unit of safe construction pressure Psafe is MPa, and r is damaged length, that is, crack length of the injury region of pipeline Degree.

Simulation results and formula calculated result are as shown in table 3:

Fracture length/mm	5	10	15	20	40	60	80
								Simulation results P/MPa	21.5	17	15	12	11	7	7
Formula calculated result P/MPa	21.5	16.8	14.6	13.1	9.8	8.0	6.7
								Error %	0	1.2	2.7	9.2	10.9	14.3	4.3

Defective form is the circumferential crack damage of the circumferential direction along pipeline, when caliber is 377mm, wall thickness 8mm, operation Pressure P is that 1.6MPa safe construction pressure Psafe is obtained by following formula:

Psafe=23.80073-3.32896*ln (r-3.54268),

Simulation results and formula calculated result are as shown in table 4:

Table 4

Fracture length/mm	5	10	15	20	40	60	80
								Simulation results P/MPa	22.5	17.9	15.5	15	10.5	10.5	10
Formula calculated result P/MPa	22.5	17.6	15.7	14.5	11.8	10.4	9.4
								Error %	0	1.7	1.3	3.3	12.4	1.0	6.0

Metal pipe line defect location detection method, which refers to, selects suitable equipment, technology and artificial identification in conjunction with field condition The process program of identification identifies the position of pipeline defect, shape, size and type, is judged, for the system for tieing up Rush Repair Scheme Basic data is provided surely, efficiently avoids the blindness of maintenance process.The technology of predominantly detecting includes non-destructive testing and artificial knowledge Other two kinds.Detection scheme flow chart as shown in Fig. 2, itself specific steps are as follows:

Step 1: leak scene exploration understands and surveys the basic condition information of scene oil-gas pipeline to be detected, to formulate Detection scheme is prepared.Mainly include following aspect:

1) history: the history Corrosion monitoring situation of pipeline to be detected repairs situation, relocates with condition of construction etc..

2) pipeline layout: the layout scenarios such as threeway, flange and bend pipe.

3) pipeline specifications: including pipe diameter, wall thickness, operating pressure, temperature etc..

4) pipeline anticorrosion coating: pitch, coal tar, epoxy powder, insulating layer etc..When tube body covers insulating layer, it is detected Position is also handled, and certain detection space, usually not less than 0.5 meter are reserved.

5) pipeline support system: simple support, circumferential clamp, welding support etc..

6) close to the difficulty of detected position: when detection support pipeline, with stable ladder firm in structure, being preferably formed with two Name and the above operating personnel assist, and have staff to be responsible for safety custody.It, be by ladder, under hole when lower pipeline is cheated in detection When grease is more, rain boots or oil-resistant and waterproof protective clothing are put on.When detecting high-temperature pipe, first measurement pipe temperature, temperature are needed When excessively high, need with special high temperature-proof gloves.

7) ambient enviroment: it is detected existing danger source situation around position, may around influence equipment, the instrument of operation Instrument, platform, building specific location.

8) defect type expected from: predicting the defect type of pipeline according to leakage situation, and corrosive shake, perforation, point are rotten Erosion, thorn leakage etc..

Step 2: determine detection scheme, according to exploration grasp information, determine detection ordering, detection method, arrangement of time, The contents such as safety protection facility, testing staff and safety responsibility supervisor, in which:

1) sequence detected will will take the normal operation of pipeline into consideration depending on on-site actual situations, not delay Premised on normal production, in conjunction with the flexibility and program simplicity of detection.

2) buried pipeline will determine whether to excavate according to exploration situation, will also be according to different erosion resistant coatings and different conveyings Medium determines the detection number of leakage point surrounding conduit and detects the selection of position, and surface duct then can be detected directly.

Step 3: instrument and equipment inspection and detection prepare, and specifically include that

1) determine that pipeline wall thickness in 5mm or more, uses ultrasonic examination.Wall thickness is below in 5mm, uses ultrasound Thick instrument measures.Inspection is attached to equipment before detection, checks Plant in good condition situation, and calibrate to equipment, if Detection range is set, pipe diameter and wall thickness are marked.Select the detection position of pipeline section, measurement pipe temperature, processing pipe surface etc..

2) pipeline exposed for ground or excavated, which can be seen, is immediately seen pipeline defect, can carry out manual identified, measure Determine shape, type and the size of pipeline leakage defect.

Step 4: carrying out detection, specifically include that

1) pipeline body is detected using Portable ultrasonic flaw detector or sonigauge.It is swept first It looks into, treats test tube section region and carry out whole scanning.After finding flaw echo, regulated attenuator, to determine that defect is maximum anti- Area where ejected wave wave amplitude, and then plan-position and the buried depth of defect are measured, record the area where its position and wave amplitude.

2) it for buried apart from longer pipeline section, needs that position appropriate is selected to carry out excavation detection, removes the pipeline section Erosion resistant coating is detected；For the serious pipeline of ultrasonic signal decaying, such as wax deposition crude oil, asphalt corrosion resistant layer or seriously corroded Pipeline section can suitably shorten initial detecting range, and using close spacing, multimetering method collects more detection data, so as to In analysis.

Step 5: Analysis of test results, analysis detecting data diagnose pipeline testing result.Mark flange, bend pipe, branch pipe, The pipelines essential attribute such as instrument.Buried position and erosion resistant coating position are indicated, the testing number for analyzing identical pipeline section different location is compared It is analyzed according to same position data investigation, the circumferential position for judging defect, observing defect, severity classification is carried out to defect.

Step 6: reinspection checks the above results one time or multipass, again to guarantee the accuracy of test result.

According to defect diagonsis as a result, being verified and being rechecked.After being compared to Analysis of test results, to there are suspected defects Pipeline section is rechecked and is analyzed, and by result and testing result comparative analysis before, determines the pipeline section position for needing to excavate.Really The pipeline section for determining existing defects, marks defective locations, and observation corrosion of the pipe wall situation can be used according to defect different location and situation Other nondestructiving detecting means, such as ultrasonic wave guided wave, magnetic powder, vortex carry out fine scanning to defect and determine the position of defect, property Matter and size.

Metal pipe line defect risk assessment scheme refers to that (circular hole is split by software emulation simulation pipeline difference defective form Seam, point, fracture etc.) and pipeline stress and deformation when defect size, determine different leakage defects to the shadow of pipeline breakage Rule is rung, damaged reason and defective form is easily revealed pipeline and carries out risk analysis, software is analyzed in establishment risk assessment, for dimension The formulation of Rush Repair Scheme provides foundation.

The risk assessment analysis software worked out can analyze the pipeline defect detected by scene, determine it to pipe The influence that line operates normally provides foundation for selection, the size of safe construction pressure etc. of tool in dimension Rush Repair Scheme, convenient existing Field uses.Evaluation of programme flow chart as shown in figure 3, itself specific steps are as follows:

Step 1: analysis pipeline Breakage Reasons and defective form, comprising:

1) the problem of investigating pipeline specification parameter, using, emergency maintenance time, place, reason and maintenance process Technology, associated production, installation, maintenance criterion etc..

2) analyzed according to finding determine pipeline easily leak damaged reason and defective form (circular hole, crack, point, Fracture etc.).

Step 2: the analogue simulation of pipeline defect, comprising:

1) test line correlation mechanics parameter.

2) mechanical model is established with ANSYS software (or other mechanical analysis softwares), simulates different defective forms and defect The stress and deformation of pipeline when size.

3) investigation and analysis result is combined to determine different leakage defects to the affecting laws of pipeline breakage.

Step 3: establishment risk assessment software is easily revealed pipeline, breaking point progress risk analysis, and establishment risk assessment is soft Part.

The no-welding dimension Rush Repair Scheme with pressure is for the pipeline according to determined by pipeline defect location detection scheme Defect situation and defect risk evaluation results and use corresponding on-line pressure sealant tool to carry out no-welding on-line pressure sealant maintenance, eliminate Security risk or leakage point, it is ensured that the technical solution that pipeline safety operates normally.It mainly include that tool selection scheme and safety are applied Work pressure determines scheme two parts.Tool selection scheme, which refers to the difference according to defect of pipeline and its operates normally on pipeline, to be influenced Difference and process and select suitable seal clamp and construction tool, dimension repairing purposefully is carried out to pipeline.Safe construction Pressure determines that scheme refers to and carries out exfactory inspection, sealing performance test to fixture by seal clamp (abbreviation fixture) test platform And safe construction pressure test, and combining software emulation simulation (mechanical analyses such as ANSYS software), it is ensured that fixture was being constructed The safe construction pressure of on-line pressure sealant, guarantees the success of dimension Rush Repair Scheme under stability and determining different defect situations in journey Rate.Tie up Rush Repair Scheme flow chart as shown in figure 4, itself specific steps are as follows:

Step 1: the selection of seal clamp, according to defect of pipeline position (such as flange, straight pipe, elbow, threeway), defect Shape (such as longitudinal crack, axial crack, R-joining, point leakage, corrode it is thinning), defect size (such as fracture length, leak source size, Extent of corrosion etc. occurs for inner and outer walls of pipeline) difference and its pipeline is operated normally influence it is different determine seal clamp used and The form of construction tool.

Flange regio defect selects flange fixture.Single grooved ring shape fixture is generally selected in the point leakage of straight pipe, single crack.Directly The many places point leakage of pipeline section, corrodes thinning etc., general selection double flute tubulose fixture at many cracks.Threeway, the leakage of elbow are general Select rectangular box-like fixture.Cause tube wall whole if detecting that crack is too long, leak source is excessive, general corrosion occurs for inner and outer walls of pipeline Body, which is thinned, leads to situations such as pipeline integral strength is too low, pipeline strength is too low at fixture injection pressure point, cannot use sealing card Tool repairs, and need to stop production and replace pipeline.

Step 2: the production and quality inspection of seal clamp require and on-site land survey actual card according to the defeated corrosive medium of pipe Tool demand is designed processing to fixture used, and is tested using seal clamp experiment porch to its quality.Fixture structure Schematic diagram is as shown in Fig. 5 to 15, wherein as shown in figure 5, seal clamp 10 is set on pipeline 70 to carry out to it Sealing, wherein 30 be flange, as shown in fig. 6, Fig. 6 is shown the bolt otic placode 40 on seal clamp 10.Fig. 7 shows sealing Fixture 10 is used to seal the schematic diagram of tee tube 50, and Fig. 8 shows the structural schematic diagram in injecting hole 11 on seal clamp 10, Fig. 9 Show the structural schematic diagram that seal clamp 10 is sealed elbow 60, wherein threaded hole 12 is provided on seal clamp 10, Figure 12 to 15 shows the structural schematic diagram that the injecting glue slot 20 of seal clamp 10 is sealed injury region.

Fixture is generally double-faced arc structure, is divided into upper lower burrs two parts, fixture cambered surface internal diameter is identical as pipeline outer diameter, up and down Be connected between disk by the folder ear of strap bolt, junction is set there are two bar shaped seal groove, inject after sealant can be achieved upper disk, under The sealing of disk faying face, there are two ring-shaped pouring glue grooves for fixture two sides, inject the sealing of achievable pipeline and fixture after sealant.Single slot Fluted, one annular seal cavity of formation after fastening is designed in the annular upper and lower disk of fixture.The upper and lower disk of dual grooved tubulose fixture In be respectively designed with bar shaped injecting glue slot, form four seal chambers associated with one another after fastening, be two rings at fixture both ends respectively Shape seal chamber, two strip seal chambers on upper and lower disk joint surface.Joint surface gap is less than 0.1mm between the upper and lower disk of fixture. Injecting hole is evenly arranged along seal chamber, and straight line and camber line spacing are respectively less than 100mm between two holes.Flange fixture is generally according to flange shape Shape and size are designed processing, and rectangular box-like fixture is depending on the actual conditions of the leakage positions such as threeway, elbow.Sealing card Tool material is required according to corrosive medium, general to select boilers and pressure vessel steel；The wall thickness of seal clamp is according to the volume of pipeline Constant-pressure determines.

It is larger but can lack in maintenance range that, spot corrosion larger for corroded area has been linked to be piece, the longer homalographic in crack It falls into, on-line pressure sealant can be carried out by lined screening glass in fixture, single grooved ring shape fixture is required to using liner screening glass.It is made When with mainly preventing using single slot fixture, sealant enters to be in contact in pipeline or sealant is contacted with tube wall with the defeated medium of pipe When resistance is excessive and the protection liner that causes injecting glue failure designed.Inner lining plate should be made according to fixture annular groove specification (wall thickness is generally 6mm) is divided to upper and lower two disks staggeredly to overlap, is stuck on annular groove and is filled and led up, generally according to actual needs may be used Edge is processed as zigzag or sharp edge, material is required according to corrosive medium, generally 45# steel.Fixture production processes Cheng Hou carries out exfactory inspection, sealing performance test and safe construction pressure test using seal clamp experiment porch, really to it Protect the safety and stability of fixture in the construction process.

Under normal conditions corresponding fixture deposit and inspection should be carried out for defect and easy leakage point easily occurs in oil field pipe It tests, to meet live emergency demand.

Step 3: the determination of safe construction pressure, comprising:

1) the maximum flexibility pressure that pipeline during injecting sealant can bear is pacified using seal clamp test platform Full operation pressure is tested, and obtains the measurement result of safe construction pressure under different pipeline parameters and defective form.

2) analogue simulation is carried out using software (mechanical analyses such as ANSYS software), determines the safe construction under different situations Pressure.

3) contrast simulation and experimental result, Optimal improvements simulation model obtain the mechanical model to tally with the actual situation, in turn It determines the empirical equation for calculating safe construction pressure, and works out safe construction calculation of pressure software.

Step 4: no-welding on-line pressure sealant operation with pressure, comprising:

1) uncured type sealant is selected, the use of temperature is 0~800 DEG C, is less than 60MPa using pressure, before injecting operation It is heated to 90 DEG C~120 DEG C.

2) pre-operational check confirmation contacts pipeline section defect situation with sealant, and is calculated by software and determine field condition Safe construction pressure.

3) carry out on-line pressure sealant construction operation, when operation injection pressure control pipeline safety operation pressure 70% with Under, and it is not less than pipeline rated pressure.

Step 5: construction post-processing, it is with slip-type plastics gum cover that seal clamp is fully wrapped around after the completion of construction, included one The butter anti-corrosion for determining quality carries out landfill recovery to the pipeline section excavated.

Metal pipe line defect location detection scheme is that on-site actual situations is combined to select suitable equipment, technology and manually recognize Surely the process program identified, it is quick, accurate that used lossless detection method has the characteristics that, is applied to in-service oil-gas pipeline and lacks It falls into detection, with the smallest buried pipeline excavation and anticorrosive coating peeling workload, most obtains defect of pipeline situation fastly, whether real be It applies pipeline allowing pressurized maintenance and how to guarantee that pipeline performance provides safely detection foundation in maintenance process.

Pipeline stress and deformation when simulating pipeline difference defective form and defect size by software emulation, to pipeline Easily the damaged reason of leakage and defective form carry out risk analysis.The risk assessment analysis software of establishment can be to detected by scene Pipeline defect analyzed, determine its to pipeline operate normally influence, for dimension Rush Repair Scheme in seal clamp and installation position Size of the selection, safe construction pressure set etc. provides foundation, is convenient for clear construction parameter.

No-welding dimension Rush Repair Scheme with pressure is for the defect of pipeline feelings according to determined by pipeline defect location detection scheme Condition and defect risk evaluation results and use corresponding on-line pressure sealant tool to carry out no-welding on-line pressure sealant maintenance, it is hidden to eliminate safety Trouble or leakage point, it is ensured that the technical solution that pipeline operates normally.The program is closed for on-site actual situations design processing or selection Suitable sealing tool simultaneously carries out no-welding dimension repairing, and has carried out quality inspection to sealing tool used before construction, it can be ensured that The stability of sealing tool in the construction process.The determination of safe construction pressure can make injecting glue point avoid pipeline breaking point, provide Safe construction pressure value avoids the blindness of injecting glue, is effectively guaranteed the safety and success rate of construction.

This method can carry out quick and precisely detection identification to metal pipe line defect and implement to defect point no-welding with pressure The process for tieing up repairing can safely, effectively complete the pipeline reparation of different pipe sections, different defects, different pressure levels.And And the pipeline items technical performance index after repairing is not less than former pipeline designs, meets live emergency demand, lets out to piping failure The further development of leakage maintenance technique is of great significance.

Wherein, in metal pipe line defect recognition and no-welding method for maintaining, temperature when sealant injects cavity is T1, In, 0 T1≤800 DEG C <.The use pressure of sealant is P1, wherein P1≤60MPa.Sealant injection cavity before temperature be T2, wherein 90 DEG C≤T2≤120 DEG C.

The pressure of glue filling device towards push sealant in cavity is P2, and, P3≤P2≤70%P4, wherein P3 is pipe The rated pressure of line, P4 are safe construction pressure.

Second embodiment according to the present invention, with pipe range about 2.8km, operating pressure 3.4MPa, outer diameter 219mm, wall thickness The seamless steel pipe of 5mm, by taking the wet crude pipe inspection of petroleum transferring station and maintenance as an example, comprising:

1, to pipeline disadvantage detection and localization:

Step 1: the pipeline section basic condition information is investigated in on-site land survey, is prepared to formulate detection scheme.It specifically includes that

1) history: the pipeline performance 18 years or more, portions corrosion and scaling phenomenon was serious, once occurs managing brokenly for several times, manage Leakage adds up to repair more than 10 times.

3) pipeline specifications: pipe diameter is Φ 219mm, wall thickness 5mm, operating pressure 3.4Mpa.

4) pipeline anticorrosion coating: insulating layer, detected position do not need to be handled.

5) pipeline support system: simple support.

6) close to the difficulty of detected position: special high temperature-proof gloves need to be worn.

7) it ambient enviroment: is detected around position without potential danger source.

8) defect type expected from: corrosive shake, perforation, thorn leakage.

Step 2: determine detection scheme, according to exploration grasp information, determine detection ordering, detection method, arrangement of time, The contents such as safety protection facility, testing staff and safety responsibility supervisor, comprising:

1) when detecting, according to on-site actual situations, premised on not delaying normal production.

2) stripping insulation layer can be detected directly without run-down around leakage point.

Step 3: instrument and equipment inspection and detection prepare, comprising:

1) the pipeline section wall thickness is 5mm, uses ultrasonic examination.It was found that thinned and problem pipeline section, uses sonigauge It measures.

2) inspection is attached to equipment, checks Plant in good condition situation, connect equipment, check cable integrity, if fill Full electricity etc..

3) equipment is calibrated, detection range is set, mark pipe diameter and wall thickness.

4) the suitable detection position of selection, avoids having larger reflectance signature (such as flange) as far as possible or to be placed in detection blind In area；

5) tube body temperature is measured.

6) pipe surface is cleared up, tube body surrounding is made to expose enough spaces, convenient for checking.

Step 4: carrying out detection, comprising:

1) manual identified is carried out to the position that leakage, leakage has occurred first, measures the shape for determining leakage, type and big It is small.Through manual identified discovery flange connecting portion spinosity leakage.

2) it to couplant is coated within the scope of remaining pipeline section position to be measured i.e. probe turnover zone, is popped one's head in using ultrasonic detector It is detected.Scanning whole section of weld joint and weld seam two sides, do sawtooth pattern scanning, and probe movement speed is not more than 150mm/s, visits Head should have every time along the displacement of bead direction 15% overlapping, in order to check transverse defect, should weld seam two sides carry out in parallel or Lateral scan with oblique angle.

3) after finding flaw echo, regulated attenuator, to determine the area where defect maximum reflection wave wave amplitude, in turn Plan-position and the buried depth for measuring defect, record the area where its position and wave amplitude.

4) the thinning defects of wall thickness such as corrosion thinning are found, sonigauge is used instead and carries out further detection confirmation, note Record its position.

Step 5: Analysis of test results, comprising:

1) pipeline essential attribute known to flange, bend pipe, branch pipe, instrument etc. is marked.

2) buried position and erosion resistant coating position are indicated.

3) it compares and analyzes the analysis methods such as detection data and the same position data investigation of identical pipeline section different location, judgement Defect, the axial direction for observing defect and circumferential position, carry out severity classification to defect；The analysis showed that at the pipeline section straight tube Without leak case, the leakage of flange connections spinosity.

Step 6: reinspection is rechecked testing result and is analyzed, by result and testing result comparative analysis before.

Step 7: obtaining test result.

Testing inspection, discovery flange connecting portion spinosity leakage, the corrosion of remaining pipeline section have been carried out to the pipeline section by this method Situation is close, no missing inspection, ideal.

2, risk analysis is carried out to defect:

Risk analysis is carried out to the flange by the risk assessment software of establishment to learn: thorn occurring at this and leaks smaller, week Bustle pipe section corrosion condition is close, and internal pressure is no more than 22.5MPa.

3, it carries out no-welding dimension with pressure to the pipeline section defect to repair, steps are as follows:

Step 1: the selection of seal clamp, this leakage point are located at flange, for small area thorn leakage, select flange fixture, card Lamps structure is as shown in Figure 5.

Step 2: the production and quality inspection of seal clamp have made processing from the selection of fixture warehouse and have carried out quality inspection The flange fixture of survey, the fixture material selection boilers and pressure vessel steel, wall thickness 15mm.Injecting glue pore size distribution uses 8 cellular types, note Glue groove groove depth 10mm, fixture and pipeline section joint surface gap are less than 0.5mm.

Step 3: determining safe construction pressure, worked out safe construction calculation of pressure software is used to bring every basic ginseng into Number is calculated and is learnt, theory α coefficient operation pressure is 19.2MPa, and injecting process piping pressure-bearing is no more than 22.5MPa, and injecting pressure is not More than 35MPa.

Step 4: uncured type injecting sealant is selected in no-welding on-line pressure sealant operation, the use of temperature is 0~800 DEG C, is used Pressure is less than 60MPa.Check confirmation and sealant engagement flange defect situation, injecting sealant is using being preceding heated to 90 DEG C~120 DEG C, it is successively injected along hole for injecting glue, injection pressure control is in 30MPa hereinafter, injection pressure rises to 35MPa and stops after filling when operation Only injecting glue closes hole for injecting glue using bolt.

Step 5: construction post-processing is wrapped up seal clamp with slip-type plastics gum cover after the completion of construction, included certain matter The butter anti-corrosion of amount.

Third embodiment according to the present invention is 11500m, operating pressure 2.2MPa, outer diameter 325mm, wall thickness with length For the spiral weld steel pipe of 5mm, certain multi-purpose station blowdown line pipe inspection and maintenance, comprising:

1, to pipeline disadvantage detection and localization, comprising the following steps:

1) history: the pipeline performance 23 years or so, portions corrosion and scaling phenomenon was serious, once occurs managing brokenly for several times, manage Leakage adds up to repair 11 times.

3) pipeline specifications: pipe diameter is Φ 325mm, wall thickness 5mm, operating pressure 2.2Mpa.

4) close to the difficulty of detected position: the pipeline section is mostly buried pipeline section, and the lower grease in hole is more, needs by ladder And put on oil-resistant and waterproof protective clothing.

5) it ambient enviroment: is detected around position without potential danger source.

6) defect type expected from: corrosive shake, perforation, spot corrosion.

Step 2: determine detection scheme, according to exploration grasp information, determine detection ordering, detection method, arrangement of time, The contents such as safety protection facility, testing staff and safety responsibility supervisor.

2) the buried part of pipeline section optionally decides whether to excavate；After excavation, erosion resistant coating is removed, determines leakage point surrounding conduit Detection number and detect position selection.

3) detection method: part ground line section detects signal than more visible, and each section of detection is primary, finds suspicious ask Pipeline section is inscribed, emphasis investigation is carried out；Most buried pipeline section according to circumstances determines every segment pipe detection number and detection position.

Step 3: instrument and equipment inspection and detection prepare, comprising:

1) the pipeline section wall thickness is 5mm, uses ultrasonic examination；It was found that thinned and problem pipeline section, uses sonigauge It measures.

2) inspection is attached to equipment, checks Plant in good condition situation；Equipment is connected, checks cable integrity, if fill Full electricity etc..

4) the suitable detection position of selection, avoids having larger reflectance signature (such as flange) as far as possible or to be placed in detection blind In area.

5) tube body temperature is measured.

Step 4: carrying out detection, comprising:

1) manual identified is carried out to the position that leakage, leakage has occurred first, measures the shape for determining leakage, type and big It is small；Manual identified discovery is away from having inclined crack at one at entrance 340km.

2) it to couplant is coated within the scope of remaining pipeline section position to be measured i.e. probe turnover zone, is popped one's head in using ultrasonic detector It is detected；Scanning whole section of weld joint and weld seam two sides, do sawtooth pattern scanning, and probe movement speed is not more than 150mm/s, visits Head should have every time along the displacement of bead direction 15% overlapping, in order to check transverse defect, should weld seam two sides carry out in parallel or Lateral scan with oblique angle.

Step 5: Analysis of test results, comprising:

2) buried position and erosion resistant coating position are indicated.

3) it compares and analyzes the analysis methods such as detection data and the same position data investigation of identical pipeline section different location, judgement Defect, the axial direction for observing defect and circumferential position, carry out severity classification to defect；The analysis showed that the pipeline section has at one Corrosive shake, crack tube wall around are integrally thinned, and have occurred and that leakage.

Step 7: obtaining test result.

Testing inspection has been carried out to the pipeline section by this method, and has been excavated, the means such as erosion resistant coating is gone to be verified, has been found Away from the inclined crack for having a long 17mm at entrance 340km, crack tube wall around is integrally thinned, and has occurred and that leakage；Remaining pipeline section Corrosion condition is close, no missing inspection, ideal.

2, risk analysis is carried out to defect, risk analysis is carried out to pipeline section at this by the risk assessment software of establishment and is obtained Know: crack is smaller at this, though tube wall around have it is thinned, on pipeline bearing capacity influence it is weaker；Pipeline pressure-bearing is no more than 20.1MPa。

Step 1: the selection of seal clamp, corrosion leakage point is located at straight pipe herein, apart from portions such as flange, elbow, threeways Farther out, Corrosion Types are inclined crack, and length is smaller, need to select straight pipe list grooved ring shape fixture for position.

Step 2: the production and quality inspection of seal clamp have made processing from the selection of fixture warehouse and have carried out quality inspection Single grooved ring shape fixture of survey, the fixture material selection boilers and pressure vessel steel, wall thickness 15mm；Fixture is double globoidal structures, Common list grooved ring shape fixture, injecting glue pore size distribution use 6 cellular types, injecting glue groove deep 10mm, and fixture is less than with pipeline section joint surface gap 0.5mm.Slips is protected using liner, material selects 45# steel according to by corrosivity requirement.

Step 3: determining safe construction pressure, worked out safe construction calculation of pressure software is used to bring every basic ginseng into Number is calculated and learnt: theory α coefficient operation pressure is 19.3MPa；Injecting process piping pressure-bearing is no more than 20.1MPa, and injecting pressure is not More than 35MPa.

Step 4: uncured type injecting sealant is selected in no-welding on-line pressure sealant operation, the use of temperature is 0~800 DEG C, is used Pressure is less than 60MPa.Check that confirmation contacts pipeline section defect situation with sealant, injecting sealant is using being preceding heated to 90 DEG C~120 DEG C, it is successively injected along hole for injecting glue, injection pressure control is in 30MPa hereinafter, injection pressure rises to 35MPa and stops after filling when operation Only injecting glue closes hole for injecting glue with bolt.

Step 5: construction post-processing, it is with slip-type plastics gum cover that seal clamp is fully wrapped around after the completion of construction, included one Determine the butter anti-corrosion of quality.

Fourth embodiment according to the present invention, with pipe range about 20km, operating pressure 6.4MPa, outer diameter 168mm, wall thickness The seamless steel pipe of 5mm, for Crude-oil Pipeline detection and maintenance.

1, to pipeline disadvantage detection and localization: the following steps are included:

1) history: the pipeline performance 10 years or more, portions corrosion and scaling phenomenon was serious, once occurs managing brokenly for several times, manage Leakage, causes pollution in wide area, adds up to repair 21 times.

3) pipeline specifications: pipe diameter is Φ 168mm, wall thickness 5mm, operating pressure 6.4Mpa, and inlet temperature is 35 DEG C, out Mouth temperature is 60 DEG C.

4) pipeline anticorrosion coating: insulating layer；It is detected position to be handled, reserves 0.8 meter of detection space.

5) pipeline support system: simple support.

8) defect type expected from: corrosive shake, perforation, spot corrosion.

Step 3: instrument and equipment inspection and detection prepare, comprising:

5) tube body temperature is measured.

Step 4: carrying out detection, comprising:

1) manual identified is carried out to the position that leakage, leakage has occurred first, measures the shape for determining leakage, type and big It is small；Manual identified finds have corrosion failure at one to leak at 10.7km from home, remaining pipeline section is without leakage.

Step 5: Analysis of test results, comprising:

2) buried position and erosion resistant coating position are indicated.

3) it compares and analyzes the analysis methods such as detection data and the same position data investigation of identical pipeline section different location, judgement Defect, the axial direction for observing defect and circumferential position, carry out severity classification to defect；The analysis showed that the pipeline section has at one The corrosion failure of diameter 2.5mm, around have a fouling, but corrosion-free thinned situation occurs.

Step 7: obtaining test result, testing inspection has been carried out to the pipeline section by this method, and excavated, remove erosion resistant coating Etc. means verified, find away from outlet 10.7km at have a diameter 2.5mm corrosion failure leak, remaining pipeline section corrode feelings Condition is close, and corrosion-free to be thinned, no missing inspection is ideal.

2, risk analysis is carried out to defect, risk analysis is carried out to pipeline section at this by the risk assessment software of establishment and is obtained Know: corrosion failure leakage of 2.5mm is smaller at this, and surrounding pipeline section corrosion condition is close, and corrosion-free to be thinned, pipeline internal pressure is not More than 22.8MPa.

Step 1: the selection of seal clamp, corrosion leakage point is located at straight pipe herein, apart from portions such as flange, elbow, threeways Farther out, Corrosion Types are spot corrosion, and leakage area is smaller, need to select straight pipe list grooved ring shape fixture for position.

Step 2: the production and quality inspection of seal clamp have made processing from the selection of fixture warehouse and have carried out quality inspection Single grooved ring shape fixture of survey, the fixture material selection boilers and pressure vessel steel, wall thickness 15mm.Fixture is double globoidal structures, Common list grooved ring shape fixture, injecting glue pore size distribution use 6 cellular types, injecting glue groove deep 10mm, and fixture is less than with pipeline section joint surface gap 0.5mm.Attached liner protects slips.

Step 3: determining safe construction pressure, worked out safe construction calculation of pressure software is used to bring every basic ginseng into Number is calculated and learnt: theory α coefficient operation pressure is 23.9MPa；Injecting process piping pressure-bearing is no more than 22.8MPa, and injecting pressure is not More than 35MPa.

Step 5: construction post-processing, with slip-type plastics gum cover that seal clamp is fully wrapped around after the completion of construction, included Huang Oily anti-corrosion.

Fifth embodiment according to the present invention is 2784m, operating pressure 1.8MPa, outer diameter 219mm, wall thickness 7mm with pipe range Spiral weld steel pipe, oily waste water treatment pipe inspection and maintenance for, comprising:

1) history: the pipeline performance 5 years or so, portions corrosion and scaling phenomenon was serious, once occurs managing brokenly for several times, manage Leakage adds up to repair 12 times.

3) pipeline specifications: pipe diameter is Φ 219mm, wall thickness 7mm, operating pressure 1.8Mpa, and inlet temperature is 48 DEG C, out Temperature of standing is 35 DEG C.

4) pipeline anticorrosion coating: bitumen layer；It is detected position to be handled, reserves 0.7 meter of detection space.

5) close to the difficulty of detected position: the pipeline section is mostly buried pipeline section, and the lower grease in hole is more, needs by ladder And put on oil-resistant and waterproof protective clothing.

6) it ambient enviroment: is detected around position without potential danger source.

7) defect type expected from: corrosive shake, perforation, spot corrosion.

Step 2: determine detection scheme, according to exploration grasp information determine detection ordering, detection method, arrangement of time, The contents such as safety protection facility, testing staff and safety responsibility supervisor, specifically include that

2) the buried part of pipeline section optionally decides whether to excavate；After excavation, bitumen layer is removed, determines leakage point surrounding conduit Detection number and detect position selection.

Step 3: instrument and equipment inspection and detection prepare, comprising:

1) the pipeline section wall thickness is 7mm, uses ultrasonic examination；It was found that thinned and problem pipeline section, uses sonigauge It measures.

5) tube body temperature is measured.

Step 4: carrying out detection, comprising:

1) manual identified is carried out to the position that leakage, leakage has occurred first, measures the shape for determining leakage, type and big It is small；Manual identified finds there are multiple leak sources at one position of pipeline section, has revealed.

Step 5: Analysis of test results, comprising:

2) buried position and erosion resistant coating position are indicated.

3) it compares and analyzes the analysis methods such as detection data and the same position data investigation of identical pipeline section different location, judgement Defect, the axial direction for observing defect and circumferential position, carry out severity classification to defect.The analysis showed that the pipeline section has at one The biggish corrosion failure of area, the position tube wall are integrally thinned, and have two 11mm long axial cracks for being nearly at parastate, Distance 6mm has the corrosion failure of multiple diameter 2mm or so around crack, has occurred and that leakage；Defect integrally substantially forms diameter The border circular areas of 18mm.

Step 7: conclusion has carried out testing inspection to the pipeline section by this method, and excavated, go the means such as erosion resistant coating into Row verifying finds that the position tube wall is integrally thinned, and has two long narrow tables away from there is the biggish corrosion default of area at one at entrance 1203m It is in the 11mm long axial crack of parastate, distance 6mm has the corrosion failure of multiple diameter 2mm or so around crack, Through leaking；Defect integrally substantially forms the border circular areas of diameter 18mm, remaining pipeline section corrosion condition is close, no missing inspection, It is ideal.

2, risk analysis is carried out to defect, risk analysis is carried out to pipeline section at this by the risk assessment software of establishment and is obtained Know: pipeline section leak point is more at this, and tube wall is integrally thinned, and pipeline bearing capacity is weaker；Pipeline pressure-bearing is less than at this 18.5MPa。

Step 1: the selection of seal clamp, corrosion leakage point is located at straight pipe herein, apart from portions such as flange, elbow, threeways Farther out, corroded area is larger, and tube wall is integrally thinned, and has crack and spot corrosion, need to select straight pipe double flute tubulose fixture for position.

Step 2: the production and quality inspection of seal clamp have made processing from the selection of fixture warehouse and have carried out quality inspection The dual grooved fixture of survey, the fixture material selection boilers and pressure vessel steel, wall thickness 15mm；Fixture is double globoidal structures, general Logical double flute tubulose fixture, annular seal space injecting glue pore size distribution use 8 cellular types, and bar shaped seal chamber injecting glue pore size distribution uses 6 cellular types, note Glue groove groove depth 10mm, wide 20mm, fixture and pipeline section joint surface gap are less than 0.5mm.

Since corroded area is larger, crack is longer at this and has many places spot corrosion, but can need in card in maintenance range Lined protection slips carries out on-line pressure sealant in tool.According to fixture annular groove specification make liner slips, wall thickness 6mm, Outer diameter 220mm is divided to upper and lower two disks staggeredly to overlap, is stuck on annular groove and is filled and led up；Liner protect slips material according to by Corrosivity requirement, selects 45# steel.

Step 3: determining safe construction pressure, worked out safe construction calculation of pressure software is used to bring every basic ginseng into Number is calculated and learnt: theory α coefficient operation pressure is 16.3MPa；Injecting process piping pressure-bearing is no more than 18.5MPa, and injecting pressure is not More than 35MPa.

Step 4: uncured type injecting sealant is selected in no-welding on-line pressure sealant operation, the use of temperature is 0~800 DEG C, is used Pressure is less than 60MPa；Check that confirmation contacts pipeline section defect situation with sealant, injecting sealant is using being preceding heated to 90 DEG C~120 DEG C, it is successively injected along hole for injecting glue, injection pressure control is in 30MPa hereinafter, injection pressure rises to 35MPa and stops after filling when operation Only injecting glue closes hole for injecting glue with bolt.

Sixth embodiment according to the present invention is 800m, operating pressure 1.7MPa, outer diameter 377mm, wall thickness 6mm with length Seamless steel pipe, for one section of soft water pipe inspection of certain infusion multi-purpose station collection transmission pipe network and maintenance, comprising:

1) history: the pipeline performance 4 years or so, overall operation was all right, added up to repair 1 time.

3) pipeline specifications: pipe diameter is Φ 377mm, wall thickness 6mm, operating pressure 1.7Mpa.

4) close to the difficulty of detected position: the pipeline section is ground pipeline section, it is exposed outside.

6) defect type expected from: corrosive shake, perforation, thorn leakage.

Step 2: determine detection scheme, according to exploration grasp information determine detection ordering, detection method, arrangement of time, The contents such as safety protection facility, testing staff and safety responsibility supervisor, comprising:

3) detection method: part ground line section detects signal than more visible, and each section of detection is primary, finds suspicious ask Pipeline section is inscribed, emphasis investigation is carried out.The buried pipeline section in part according to circumstances determines every segment pipe detection number and detection position.

Step 3: instrument and equipment inspection and detection prepare, comprising:

1) the pipeline section wall thickness is 6mm, uses ultrasonic examination；It was found that thinned and problem pipeline section, uses sonigauge It measures.

5) tube body temperature is measured.

Step 4: carrying out detection, comprising:

1) manual identified is carried out to the position that leakage, leakage has occurred first, measures the shape for determining leakage, type and big It is small；Manual identified finds spinosity leakage at the threeway of 9m from home, remaining pipeline section is without leakage.

Step 5: Analysis of test results, comprising:

2) buried position and erosion resistant coating position are indicated.

3) it compares and analyzes the analysis methods such as detection data and the same position data investigation of identical pipeline section different location, judgement Defect, the axial direction for observing defect and circumferential position, carry out severity classification to defect.The analysis showed that from home the three of 9m Logical place's spinosity leakage, leak source diameter is about 3mm, remaining pipeline section overall condition is good.

Step 7: obtaining test result, testing inspection has been carried out to the pipeline section by this method, has found the three of 9m from home Logical place's spinosity leakage, leak source diameter is about 13mm, has occurred and that leakage；Remaining pipeline section is all right, no missing inspection, ideal.

2, risk analysis is carried out to defect, risk analysis is carried out to pipeline section at this by the risk assessment software of establishment and is obtained Know: leak source is 3mm at the threeway, and leak source is small, is influenced on pipeline bearing capacity weaker；Pipeline pressure-bearing is no more than 16.7MPa.

Step 1: the selection of seal clamp, leakage point is located at threeway herein, and Corrosion Types are circular hole, diameter 13mm, Rectangular box-like fixture need to be selected.

Step 2: the production and quality inspection of seal clamp have made processing from the selection of fixture warehouse and have carried out quality inspection The rectangular box-like fixture surveyed, the fixture material selection boilers and pressure vessel steel, wall thickness 15mm.Injecting glue pore size distribution uses 6 holes Formula, injecting glue groove deep 10mm, fixture and bend pipe joint surface gap are less than 0.5mm.

Step 3: determining safe construction pressure, worked out safe construction calculation of pressure software is used to bring every basic ginseng into Number is calculated and learnt: theory α coefficient operation pressure is 15.3MPa；Injecting process piping pressure-bearing is no more than 16.7MPa, and injecting pressure is not More than 35MPa.

Seventh embodiment according to the present invention is 1467m, operating pressure 0.4MPa, outer diameter 219mm, wall thickness 5mm with length Seamless steel pipe, certain wellblock oil-collecting main line detection and maintenance for, comprising:

1, to pipeline disadvantage detection and localization:

1) history: the pipeline performance 16 years or so, once occurred managing broken, pipe leakage caused by inside and outside corrosion for several times, and added up to repair 8 It is secondary.

3) pipeline specifications: pipe diameter is Φ 219mm, wall thickness 5mm, operating pressure 0.4Mpa.

4) close to the difficulty of detected position: the pipeline section part is buried pipeline section, needs by ladder and puts on oil resistant and refuse Water protective garment.

6) defect type expected from: corrosive shake, perforation, thorn leakage.

Step 3: instrument and equipment inspection and detection prepare, comprising:

5) tube body temperature is measured.

Step 4: carrying out detection, comprising:

1) manual identified is carried out to the position that leakage, leakage has occurred first, measures the shape for determining leakage, type and big It is small；Elbow spinosity leakage of the manual identified discovery away from starting point 328m, remaining pipeline section is without leakage.

Step 5: Analysis of test results, comprising:

2) buried position and erosion resistant coating position are indicated.

3) it compares and analyzes the analysis methods such as detection data and the same position data investigation of identical pipeline section different location, judgement Defect, the axial direction for observing defect and circumferential position, carry out severity classification to defect；The analysis showed that away from starting point 328m's The leakage of elbow spinosity, leak source diameter is about 4mm, remaining pipeline section overall condition is good.

Step 7: obtaining test result, testing inspection has been carried out to the pipeline section by this method, and excavated, remove erosion resistant coating Etc. means verified, find away from starting point 328m elbow spinosity leakage, leak source diameter is about 4mm, has occurred and that leakage；Remaining Pipeline section is all right, no missing inspection, ideal.

2, risk analysis is carried out to defect, risk analysis is carried out to pipeline section at this by the risk assessment software of establishment and is obtained Know: the elbow leak source is 4mm, and leak source is small, is influenced on pipeline bearing capacity weaker；Pipeline pressure-bearing is no more than 21.1MPa.

Step 1: the selection of seal clamp, leakage point is located at elbow herein, and Corrosion Types are circular hole, and diameter 4mm is needed Select rectangular box-like fixture.

Step 3: determining safe construction pressure, worked out safe construction calculation of pressure software is used to bring every basic ginseng into Number is calculated and learnt: theory α coefficient operation pressure is 19.8MPa；Injecting process piping pressure-bearing is no more than 21.1MPa, and injecting pressure is not More than 35MPa.

8th embodiment according to the present invention is 2.4km, operating pressure 2.5MPa, outer diameter 219mm, wall thickness 7mm with pipe range Seamless steel pipe, for the detection of petroleum transferring station fuel-displaced line and maintenance, comprising:

Step 1: on-site land survey investigates the pipeline section basic condition information and prepares to formulate detection scheme.It specifically includes that

1) history: the pipeline performance 14 years or so, pipeline corrosion, scale formation compared serious, once repeatedly occur pipe it is broken, Pipe leakage, causes large area oil leak, adds up to repair 32 times.

3) pipeline specifications: pipe diameter is Φ 219mm, wall thickness 7mm, operating pressure 2.5Mpa, and inlet temperature is 40 DEG C, out Temperature of standing is 58 DEG C.

4) pipeline anticorrosion coating: bitumen layer；It is detected position to be handled, reserves 0.6 meter of detection space.

5) close to the difficulty of detected position: special high temperature-proof gloves need to be worn.

7) defect type expected from: corrosive shake, perforation, spot corrosion.

Step 2: determining detection scheme, comprising:

According to the information that exploration is grasped, detection ordering, detection method, arrangement of time, safety protection facility, detection people are determined The contents such as member and safety responsibility supervisor.

3) detection method: part ground line section detects signal than more visible, and each section of detection is primary, finds suspicious ask Pipeline section is inscribed, emphasis investigation is carried out.Most buried pipeline section according to circumstances determines every segment pipe detection number and detection position.

Step 3: instrument and equipment inspection and detection prepare, comprising:

5) tube body temperature is measured.

Step 4: carrying out detection, comprising:

1) manual identified is carried out to the position that leakage, leakage has occurred first, measures the shape for determining leakage, type and big It is small；Manual identified finds there is large area oil leak at one at 721m from home, remaining pipeline section is without leakage.

Step 5: Analysis of test results, comprising:

2) buried position and erosion resistant coating position are indicated.

3) it compares and analyzes the analysis methods such as detection data and the same position data investigation of identical pipeline section different location, judgement Defect, the axial direction for observing defect and circumferential position, carry out severity classification to defect.The analysis showed that the pipeline section has at one The biggish corrosion failure of area, the position tube wall are integrally thinned, and around have 2 R-joinings, and length is respectively 55mm, 70mm, and one Axial crack, length 65mm have the corrosion failure of multiple diameter 6mm or so around crack, have occurred and that leakage, have occurred and that and let out Leakage.

Step 7: obtaining test result, testing inspection has been carried out to the pipeline section by this method, and excavated, remove erosion resistant coating Etc. means verified, discovery from home has the biggish corrosion failure of area at one at 721m, which is integrally thinned, week It is with 2 R-joinings, length is respectively 55mm, 70mm, an axial crack, length 65mm, there are multiple diameter 6mm left around crack Right corrosion failure, has occurred and that leakage, defect integrally substantially forms the border circular areas of diameter 100mm.Remaining pipeline section corrodes feelings Condition is close, no missing inspection, ideal.

2, risk analysis is carried out to defect, risk analysis is carried out to pipeline section at this by the risk assessment software of establishment and is obtained Know: pipeline section leak point is more at this, and tube wall is integrally thinned, and pipeline bearing capacity is very weak, it is proposed that stop production replacement pipeline.

Step 1: the selection of seal clamp, corrosion leakage point is located at straight pipe herein, apart from portions such as flange, elbow, threeways Farther out, tube wall is integrally thinned, and has crack and spot corrosion, and corroded area is larger for position, cannot be repaired using seal clamp, considers Stop production replacement pipeline.

Step 3: determining safe construction pressure, worked out safe construction calculation of pressure software is used to bring every basic ginseng into Number is calculated and learnt: theory α coefficient operation pressure is 8.2MPa；Injecting process piping pressure-bearing is no more than 10.5MPa, and injecting pressure is not More than 18MPa.

Step 4: maintenance suggests that, because corroded area is larger at this, tube wall is integrally thinned, and has compared with large fracture and spot corrosion, surpasses It out can maintenance range, it is proposed that stop production replacement pipeline.

The foregoing is only a preferred embodiment of the present invention, is not intended to restrict the invention, for the skill of this field For art personnel, the invention may be variously modified and varied.All within the spirits and principles of the present invention, made any to repair Change, equivalent replacement, improvement etc., should all be included in the protection scope of the present invention.

Claims

1. a kind of metal pipe line defect recognition and no-welding method for maintaining characterized by comprising

Damage data table is established, the function established between damage regime and safe construction pressure in the damage data table closes System；

It is detected by the damage regime of the detection device to pipeline, and according to the institute determined after detection device detection Damage regime is stated, by inquiring the damage data table with the safe construction pressure of the determination pipeline；

According to the safe construction pressure and the compatible seal clamp of damage regime selection after determination；By the sealing Fixture is mounted on the injury region of the pipeline, and makes to form cavity between the seal clamp and the outer wall of the pipeline；

Sealant is injected into the cavity by glue filling device, maintenance is sealed with the injury region to the pipeline, it is described close The pressure that envelope agent generates in the cavity is less than the safe construction pressure.

2. metal pipe line defect recognition according to claim 1 and no-welding method for maintaining, which is characterized in that the damage Operating condition includes the injecting glue of the material type of the pipeline, the type of impairment of the pipeline and the injury region and the seal clamp The distance between slot；When establishing the damage data table, by the material type of the pipeline, the type of impairment of the pipeline and The distance between the injecting glue slot of the injury region and the seal clamp is fitted to obtain the safe construction pressure.

3. metal pipe line defect recognition according to claim 2 and no-welding method for maintaining, which is characterized in that the damage Type includes poroid damage, and the safe construction pressure Psafe is obtained by following formula:

Psafe=157.05519-31.10771*ln (r+74.249),

Wherein,

The unit of the safe construction pressure Psafe is MPa,

The injury region of the pipeline is cavernous structure, and r is the radius of the cavernous structure, unit mm.

4. metal pipe line defect recognition according to claim 2 and no-welding method for maintaining, which is characterized in that the damage Type includes poroid damage, and the safe construction pressure Psafe is obtained by following formula:

Psafe=247.00606-52.10033*ln (r+65.39911),

Wherein,

The unit of the safe construction pressure Psafe is MPa,

5. metal pipe line defect recognition according to claim 2 and no-welding method for maintaining, which is characterized in that the damage Type includes the axial crack damage along the axial direction of the pipeline, and the safe construction pressure Psafe passes through following formula It obtains:

Psafe=25.55345-4.34022*ln (r-2.47777),

Wherein,

The unit of the safe construction pressure Psafe is MPa,

R is the damaged length of the injury region of the pipeline.

6. metal pipe line defect recognition according to claim 2 and no-welding method for maintaining, which is characterized in that the damage Type includes the circumferential crack damage of the circumferential direction along the pipeline, and the safe construction pressure Psafe passes through following formula It obtains:

Psafe=23.80073-3.32896*ln (r-3.54268),

Wherein,

The unit of the safe construction pressure Psafe is MPa,

R is the damaged length of the injury region of the pipeline.

7. metal pipe line defect recognition according to claim 1 and no-welding method for maintaining, which is characterized in that the sealing The temperature when cavity is injected in agent is T1, wherein 0 T1≤800 DEG C <.

8. metal pipe line defect recognition according to claim 1 and no-welding method for maintaining, which is characterized in that the sealing The use pressure of agent is P1, wherein P1≤60MPa.

9. metal pipe line defect recognition according to claim 1 and no-welding method for maintaining, which is characterized in that the sealing It is T2 that the temperature before the cavity is injected in agent, wherein 90 DEG C≤T2≤120 DEG C.

10. metal pipe line defect recognition according to claim 1 and no-welding method for maintaining, which is characterized in that the note Adhesive dispenser towards the pressure that the sealant is pushed in the cavity be P2, and, P3≤P2≤70%P4,

Wherein,

P3 is the rated pressure of the pipeline；

P4 is the safe construction pressure.

11. metal pipe line defect recognition according to claim 1 and no-welding method for maintaining, which is characterized in that the inspection Surveying device includes supersonic detector and sonigauge, as 5mm≤δ, using the supersonic detector to the pipe Line is detected, and as δ < 5mm, is detected using the sonigauge to the pipeline, wherein the δ is described The wall thickness of pipeline.

12. metal pipe line defect recognition according to claim 1 and no-welding method for maintaining, which is characterized in that described close Envelope fixture includes at least one of flange fixture, single grooved ring shape fixture, double flute fixture or rectangular box-like fixture.