CN112268808A - Test method for combined action of bending moment and internal pressure of submarine pipeline - Google Patents
Test method for combined action of bending moment and internal pressure of submarine pipeline Download PDFInfo
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- CN112268808A CN112268808A CN202011132119.6A CN202011132119A CN112268808A CN 112268808 A CN112268808 A CN 112268808A CN 202011132119 A CN202011132119 A CN 202011132119A CN 112268808 A CN112268808 A CN 112268808A
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N3/00—Investigating strength properties of solid materials by application of mechanical stress
- G01N3/08—Investigating strength properties of solid materials by application of mechanical stress by applying steady tensile or compressive forces
- G01N3/10—Investigating strength properties of solid materials by application of mechanical stress by applying steady tensile or compressive forces generated by pneumatic or hydraulic pressure
- G01N3/12—Pressure testing
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01M—TESTING STATIC OR DYNAMIC BALANCE OF MACHINES OR STRUCTURES; TESTING OF STRUCTURES OR APPARATUS, NOT OTHERWISE PROVIDED FOR
- G01M3/00—Investigating fluid-tightness of structures
- G01M3/02—Investigating fluid-tightness of structures by using fluid or vacuum
- G01M3/26—Investigating fluid-tightness of structures by using fluid or vacuum by measuring rate of loss or gain of fluid, e.g. by pressure-responsive devices, by flow detectors
- G01M3/28—Investigating fluid-tightness of structures by using fluid or vacuum by measuring rate of loss or gain of fluid, e.g. by pressure-responsive devices, by flow detectors for pipes, cables or tubes; for pipe joints or seals; for valves ; for welds
- G01M3/2807—Investigating fluid-tightness of structures by using fluid or vacuum by measuring rate of loss or gain of fluid, e.g. by pressure-responsive devices, by flow detectors for pipes, cables or tubes; for pipe joints or seals; for valves ; for welds for pipes
- G01M3/2815—Investigating fluid-tightness of structures by using fluid or vacuum by measuring rate of loss or gain of fluid, e.g. by pressure-responsive devices, by flow detectors for pipes, cables or tubes; for pipe joints or seals; for valves ; for welds for pipes using pressure measurements
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N3/00—Investigating strength properties of solid materials by application of mechanical stress
- G01N3/02—Details
-
- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N3/00—Investigating strength properties of solid materials by application of mechanical stress
- G01N3/02—Details
- G01N3/04—Chucks
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N3/00—Investigating strength properties of solid materials by application of mechanical stress
- G01N3/20—Investigating strength properties of solid materials by application of mechanical stress by applying steady bending forces
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N3/00—Investigating strength properties of solid materials by application of mechanical stress
- G01N3/22—Investigating strength properties of solid materials by application of mechanical stress by applying steady torsional forces
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N3/00—Investigating strength properties of solid materials by application of mechanical stress
- G01N3/26—Investigating twisting or coiling properties
Abstract
The embodiment of the invention relates to a test method for combined action of bending moment and internal pressure of a submarine pipeline, which comprises the following steps: adjusting the sliding support frame to a preset position through a test console so as to enable the fixing clamps to be positioned at the same level, and performing zero calibration on the displacement sensor; adhering a strain gauge on the surface of the test pipe, connecting the sealing port with the test pipe, and detecting the tightness of the test pipe; fixing the test pipe fitting on the sliding support frame by using a fixing clamp, and ensuring the free rotation performance of the fixing clamp; the strain gauge is connected with the strain gauge, the strain gauge is connected with the test console, the strain gauge is used for reflecting the strain stress of the test pipe fitting in real time, and the strain gauge is connected with the water pressure loading system; adding water into the test pipe fitting for exhausting, loading to test water pressure under the condition of intact tightness, and loading a bending moment effect by using a hydraulic system according to actual needs; and monitoring the test progress in real time according to data fed back by the displacement sensor, the hydraulic instrument, the hydraulic pressure instrument, the strain gauge and the strain gauge.
Description
Technical Field
The embodiment of the invention relates to the technical field of ocean engineering, in particular to a test method for joint action of bending moment and internal pressure of a submarine pipeline.
Background
Under the background of the shortage of world resources, the development of abundant marine resources is trending for a long time, and submarine pipeline transportation is taken as an important mode with the widest application, has the advantages of large transportation quantity, continuity and reliability, small influence of natural weather and the like, but once a damage leakage accident occurs, huge economic loss and environmental damage problems can be caused. Necessary submarine pipeline simulation experiments are indispensable for ensuring the safety and reliability of submarine pipeline transportation and reducing the huge loss caused by accidents.
Submarine pipelines need to be laid in marine oil and gas resource exploitation, and a vertical bending section and a bottom contact section can generate large bending moment deformation when a pipe laying ship lays pipes. In the normal operation process of the submarine pipeline, the pipeline always bears certain pressure to realize oil and gas transportation, and meanwhile, the pipeline often has certain bending deformation, such as a pipe section connecting an ocean platform and a manifold, wherein the pipeline is easy to damage under the action of complex load under the combined action of obvious bending moment and internal pressure, and the pipe section is also a high-incidence area for pipeline damage. Therefore, the method is very important for the safety check of the submarine pipeline, especially for the research under the complex load action of the bending moment internal pressure.
Disclosure of Invention
In view of this, in order to solve the problems in the prior art, the embodiment of the invention provides a test method for the joint action of the bending moment and the internal pressure of the submarine pipeline.
The embodiment of the invention provides a test method for the combined action of bending moment and internal pressure of a submarine pipeline, which is applied to a test device for the combined action of bending moment and internal pressure of the submarine pipeline, and comprises the following steps:
adjusting the sliding support frame to a preset position through a test console so as to enable the fixing clamps to be positioned at the same level, and performing zero calibration on the displacement sensor;
adhering a strain gauge on the surface of the test pipe, connecting the sealing port with the test pipe, and detecting the tightness of the test pipe;
fixing the test pipe fitting on the sliding support frame by using a fixing clamp, and ensuring the free rotation performance of the fixing clamp;
the strain gauge is connected with the strain gauge, the strain gauge is connected with the test console, the strain gauge is used for reflecting the strain stress of the test pipe fitting in real time, and the strain gauge is connected with the water pressure loading system;
adding water into the test pipe fitting for exhausting, loading to test water pressure under the condition of intact tightness, and loading a bending moment effect by using a hydraulic system according to actual needs;
and monitoring the test progress in real time according to data fed back by the displacement sensor, the hydraulic instrument, the hydraulic pressure instrument, the strain gauge and the strain gauge.
In an alternative embodiment, the connecting the sealing port with the test tubing comprises:
and connecting the exhaust end of the sealed port with one end of the test pipe fitting, and connecting the water inlet end of the sealed port with the other end of the test pipe fitting.
In an alternative embodiment, the fixing of the test tube to the sliding support frame by the fixing clip includes:
the test pipe fittings are fixed on the four groups of sliding support frames by utilizing four fixing clamps, wherein the fixing clamps correspond to the sliding support frames one to one.
In an alternative embodiment, the adding water and exhausting air to the test pipe, and the loading to the test water pressure under the condition of perfect tightness comprises the following steps:
and starting a hydraulic pump to load water pressure, adding water into the test pipe fitting for exhausting, and loading data to a water pressure instrument to reach the test water pressure under the condition of intact tightness.
In an alternative embodiment, the loading of the bending moment effect by the hydraulic system according to actual needs includes:
according to actual needs, the hydraulic pump is started, and the lifting of the middle two groups of sliding support frames is controlled by controlling the reversing valve so as to apply a bending moment effect on the test pipe fitting. The submarine pipeline bending moment and internal pressure combined action test method provided by the embodiment of the invention can monitor the strain stress in real time and research the ultimate bearing capacity of the strain stress under the condition that the pipeline is subjected to complex loads of bending moment and internal pressure, can provide technical test support for the design of the submarine pipeline, and provides guarantee for the safety and reliability of pipeline transportation.
Drawings
In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings used in the description of the embodiments or the prior art will be briefly described below, it is obvious that the drawings in the following description are only some embodiments described in the embodiments of the present invention, and it is also possible for a person skilled in the art to obtain other drawings based on the drawings.
FIG. 1 is a schematic structural diagram of a testing apparatus for testing the combined action of bending moment and internal pressure of a submarine pipeline according to an embodiment of the present invention;
FIG. 2 is a schematic flow chart of an implementation of a test method for the combined action of bending moment and internal pressure of a submarine pipeline according to an embodiment of the present invention;
FIG. 3 is a schematic structural diagram of a hydraulic system according to an embodiment of the present invention;
FIG. 4 is a schematic structural diagram of a loaded hydraulic system according to an embodiment of the present invention;
FIG. 5 is a schematic view of a sealing port (exhaust port) according to an embodiment of the present invention;
the reference numbers in the figures illustrate: 1-sealing port (exhaust end); 2-test the pipe fitting; 3-fixing the clamp; 4-a strain gauge; 5-sliding supporting frame (lifting); 6-a console; 7-sliding support frame (not liftable); 8-sealing the port (water inlet end); 9-a reversing valve; 10-an electrically driven hydraulic pump; 11-a water tank; 12-electric hydraulic pump; 13-a water pressure meter; 14-hydraulic pressure pipe; 15-a slide rail; 16-hydraulic pipe(s); 17-a hydraulic cylinder; 18-an operation table; 19-a rotating shaft; 20-hydraulic lever (side displacement sensor); 21-a hydraulic instrument; 22-hydraulic oil pump main body; 23-water tank inlet pipe; 24-a water tank outlet pipe; 25-hydraulic pump body; 26-a drainage pressure relief valve; 27-a valve handle; 28-a gas tight valve; 29-exhaust hole; 30-a sealing ring; 31-air outlet.
Detailed Description
In order to make the objects, technical solutions and advantages of the embodiments of the present invention clearer, the technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are some, but not all, embodiments of the present invention. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.
For the convenience of understanding of the embodiments of the present invention, the following description will be further explained with reference to specific embodiments, which are not to be construed as limiting the embodiments of the present invention.
As shown in fig. 1, a schematic structural diagram of a test apparatus for testing the combined action of bending moment and internal pressure of a submarine pipeline according to an embodiment of the present invention is provided, where the apparatus includes: the hydraulic system comprises an operation platform, a hydraulic system and a loading hydraulic system.
The operation platform comprises a sliding support frame, the sliding support frame is arranged on the sliding rail, the sliding support frame is matched with a rotatable pipe fitting fixing clamp to fix the test pipe fitting, and the fixing clamp adapts to bending deformation and rotation of the test pipe fitting and ensures that the test pipe fitting is tightly attached.
The hydraulic system comprises a hydraulic oil pump main body, a hydraulic pump, a reversing valve, a hydraulic cylinder, a hydraulic pipe and a hydraulic rod; the hydraulic pump the switching-over valve respectively with hydraulic oil pump main part is connected, and is located hydraulic oil pump main part top, the switching-over valve with the hydraulic pressure union coupling, the hydraulic pressure pipe with the pneumatic cylinder is connected, the pneumatic cylinder run through in the slip support frame, the hydraulic stem set up in inside the pneumatic cylinder, just hydraulic stem one end position is higher than the slip support frame.
The loading hydraulic system comprises a water tank, a hydraulic pump main body, a hydraulic pipe and a sealing port; the water tank is positioned at the top of the hydraulic pump main body, the hydraulic pump is connected with the hydraulic pump main body, one end of the hydraulic pipe is arranged on the surface of the hydraulic pump main body, and the other end of the hydraulic pipe penetrates through the water inlet end of the sealed port to be connected with one end of the test pipe fitting.
Optionally, the operating platform comprises four groups of sliding support frames, the four groups of sliding support frames are sequentially arranged on the sliding rail, the middle two groups of sliding support frames can be lifted, and the two groups of sliding support frames on the two sides can not be lifted.
Optionally, the two sets of sliding support frames in the middle are respectively provided with a strain gauge.
Optionally, the operating platform further comprises a strain gauge and a test console; the strain gauge is connected with a strain gauge, and the strain gauge is connected with a test console.
Optionally, the hydraulic pipes include two sets of hydraulic pipes, and the two sets of hydraulic pipes are respectively connected with the reversing valve; the hydraulic cylinders comprise two groups of hydraulic cylinders which are respectively connected with the two groups of hydraulic pipes in a one-to-one manner; the hydraulic rods comprise two groups of hydraulic rods which are respectively arranged in the hydraulic cylinder in a one-to-one mode.
Optionally, one end of the hydraulic rod is connected with the two middle groups of fixing clamps through a rotating shaft, and the two groups of fixing clamps on the two sides are fixed on the two groups of sliding support frames on the two sides.
Optionally, a hydraulic instrument is arranged on the surface of the reversing valve.
Optionally, a pressure relief valve is arranged on the surface of the hydraulic pump main body.
Optionally, a water inlet pipe and a water outlet pipe are arranged on the surface of the water tank.
Optionally, the exhaust end of the sealing port is arranged at the other end of the test tube.
Based on the test device for the joint action of the bending moment and the internal pressure of the submarine pipeline, as shown in fig. 2, the test method for the joint action of the bending moment and the internal pressure of the submarine pipeline provided by the embodiment of the invention specifically comprises the following steps:
s201, adjusting the sliding support frame to a preset position through a test console so as to enable the fixing clamps to be located at the same level, and performing zero calibration on the displacement sensor;
s202, adhering a strain gauge on the surface of the test pipe, connecting the sealing port with the test pipe, and detecting the tightness of the test pipe;
s203, fixing the test pipe fitting on the sliding support frame by using a fixing clamp, and ensuring the free rotation performance of the fixing clamp;
s204, connecting the strain gauge with a strain gauge, connecting the strain gauge with a test console, reflecting the strain stress of the test pipe fitting in real time, and connecting the strain gauge with a hydraulic loading system;
s205, adding water into the test pipe fitting for exhausting, loading to test water pressure under the condition that the tightness is intact, and loading a bending moment effect by using a hydraulic system according to actual needs;
and S206, monitoring the test progress in real time according to the data fed back by the displacement sensor, the hydraulic instrument, the hydraulic pressure instrument, the strain gauge and the strain gauge.
As shown in fig. 1, in the test preparation stage, the sliding support frame 5 is moved by the console 6 (or remote computer operation), the bending moment loading position is adjusted, the left end of the test pipe 2 is hermetically connected with the sealing port 1, the right end of the test pipe is hermetically connected with the sealing port 8, the four fixing clamps 3 are fixed on the four groups of sliding support frames 5, the strain gauge 4 is connected with the strain gauge on the pipe 2, and meanwhile, the strain gauge is connected with the console 6, so that the strain stress of the pipe 2 can be reflected in real time.
When the test is started, the electric hydraulic pump 12 is started to load water pressure, the indication of the water pressure instrument 13 is noticed, the water pressure is kept unchanged after the specified internal pressure is reached, the electric hydraulic pump 10 is started, the lifting of the middle two groups of sliding support frames is controlled by controlling the reversing valve 9, bending moment is applied to the pipe fitting 2, meanwhile, the hydraulic rod 20 in the graph 2 is provided with a displacement sensor which is connected with the control console 6, the displacement of the pipe fitting 2 can be reflected in real time, and accurate indication can be made whether the pipe fitting 2 reaches the limit or not by matching with strain stress data.
As shown in fig. 3, when the hydraulic system works, the electric hydraulic pump 10 drives the hydraulic oil pump main body 22, the hydraulic rod 20 is lifted by controlling the reversing valve 9, the bending moment loading on the pipe fitting is completed, and the displacement sensor transmits data to the console; the rotating shaft 19 ensures that the fixing clamp 3 can rotate to match the pipe fitting and can still be in close contact after the pipe fitting is deformed by bending moment; the hydraulic line 16 is illustrated here as actually a pair of oil lines, one in and one out, drawn for simplicity and for one line.
As shown in fig. 4, before the loading hydraulic system works, water is added into the water tank 11 through the water inlet pipe 23 to provide a water source for hydraulic loading, the electric hydraulic pump 12 pumps the water in the water tank 11 into the sealed port 8 through the hydraulic pump main body 25 to realize loading hydraulic pressure, and after the specified internal pressure is reached, the loading is stopped and the hydraulic pressure is kept unchanged; after the experiment is finished, the water pressure of unloading is to open the drainage relief valve 26, so that the water pressure in the pipe fitting is reduced to the standard atmospheric pressure, and the safety of other disassembly works is ensured.
As shown in fig. 5, in the process of adding water pressure to the sealed pipe, firstly, the airtight valve 28 is opened, so that the gas in the pipe is discharged out of the pipe through the exhaust hole 29, the airtight valve 28 and the gas outlet 31, and when the gas outlet 31 starts to discharge water, the airtight valve 28 is closed, so as to increase the water pressure in the pipe; meanwhile, when the pressure of the pressure release valve 26 in fig. 3 is released to a safe level, the pipe fitting is twisted to make the valve handle 27 face downwards vertically, and then the airtight valve 28 is opened to realize the drainage in the pipe.
The invention provides a test method for joint action of bending moment and internal pressure aiming at a submarine pipeline, which can realize that the action of bending moment is exerted while a pipe fitting is stressed by internal pressure, and the stress condition of the submarine pipeline is closer to the actual stress condition; the research of the pipeline under the action of complex load is further promoted, and technical equipment support is provided for corresponding tests. Compared with the prior art at home and abroad, the method has the following advantages:
(1) the invention can realize the simulation analysis of the pipe fitting under the joint action of the bending moment and the internal pressure, the test condition is closer to the actual condition, and a more accurate data basis is provided for engineering application.
(2) The four groups of sliding support frames can realize the test of pipe fittings with different sizes, and have wide application range.
(3) The hydraulic lifting design can realize the cyclic loading of positive and negative bending moments without dismounting the pipe fitting, and is more convenient and efficient.
(4) The control console integrates monitoring and control into a whole, can be remotely connected with a computer end for control, and improves the operability and the safety.
Those of skill would further appreciate that the various illustrative components and algorithm steps described in connection with the embodiments disclosed herein may be implemented as electronic hardware, computer software, or combinations of both, and that the various illustrative components and steps have been described above generally in terms of their functionality in order to clearly illustrate this interchangeability of hardware and software. Whether such functionality is implemented as hardware or software depends upon the particular application and design constraints imposed on the implementation. Skilled artisans may implement the described functionality in varying ways for each particular application, but such implementation decisions should not be interpreted as causing a departure from the scope of the present invention.
The steps of a method or algorithm described in connection with the embodiments disclosed herein may be embodied in hardware, a software system executed by a processor, or a combination of the two. The software system may reside in Random Access Memory (RAM), memory, Read Only Memory (ROM), electrically programmable ROM, electrically erasable programmable ROM, registers, hard disk, a removable disk, a CD-ROM, or any other form of storage medium known in the art.
The above-mentioned embodiments are intended to illustrate the objects, technical solutions and advantages of the present invention in further detail, and it should be understood that the above-mentioned embodiments are merely exemplary embodiments of the present invention, and are not intended to limit the scope of the present invention, and any modifications, equivalent substitutions, improvements and the like made within the spirit and principle of the present invention should be included in the scope of the present invention.
Claims (5)
1. A test method for the combined action of bending moment and internal pressure of a submarine pipeline is characterized by being applied to a test device for the combined action of bending moment and internal pressure of the submarine pipeline, and comprises the following steps:
adjusting the sliding support frame to a preset position through a test console so as to enable the fixing clamps to be positioned at the same level, and performing zero calibration on the displacement sensor;
adhering a strain gauge on the surface of the test pipe, connecting the sealing port with the test pipe, and detecting the tightness of the test pipe;
fixing the test pipe fitting on the sliding support frame by using a fixing clamp, and ensuring the free rotation performance of the fixing clamp;
the strain gauge is connected with the strain gauge, the strain gauge is connected with the test console, the strain gauge is used for reflecting the strain stress of the test pipe fitting in real time, and the strain gauge is connected with the water pressure loading system;
adding water into the test pipe fitting for exhausting, loading to test water pressure under the condition of intact tightness, and loading a bending moment effect by using a hydraulic system according to actual needs;
and monitoring the test progress in real time according to data fed back by the displacement sensor, the hydraulic instrument, the hydraulic pressure instrument, the strain gauge and the strain gauge.
2. The method of claim 1, wherein said connecting a sealing port with a test tubular comprises:
and connecting the exhaust end of the sealed port with one end of the test pipe fitting, and connecting the water inlet end of the sealed port with the other end of the test pipe fitting.
3. The method of claim 1, wherein securing the test tubular to the sliding support frame with a retaining clip comprises:
the test pipe fittings are fixed on the four groups of sliding support frames by utilizing four fixing clamps, wherein the fixing clamps correspond to the sliding support frames one to one.
4. The method of claim 1, wherein the step of adding water to the test tube to evacuate the test tube and the step of loading the test tube with a perfect seal to a test water pressure comprises the steps of:
and starting a hydraulic pump to load water pressure, adding water into the test pipe fitting for exhausting, and loading data to a water pressure instrument to reach the test water pressure under the condition of intact tightness.
5. The method according to claim 1, wherein the loading of the bending moment effect by the hydraulic system according to actual needs comprises:
according to actual needs, the hydraulic pump is started, and the lifting of the middle two groups of sliding support frames is controlled by controlling the reversing valve so as to apply a bending moment effect on the test pipe fitting.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
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| CN202011132119.6A CN112268808A (en) | 2020-10-21 | 2020-10-21 | Test method for combined action of bending moment and internal pressure of submarine pipeline |
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| Application Number | Priority Date | Filing Date | Title |
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| CN202011132119.6A CN112268808A (en) | 2020-10-21 | 2020-10-21 | Test method for combined action of bending moment and internal pressure of submarine pipeline |
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Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN113237617A (en) * | 2021-04-08 | 2021-08-10 | 天津大学 | Underwater shell modal test device considering internal flow field and pressure influence thereof |
| CN113237782A (en) * | 2021-04-22 | 2021-08-10 | 天津大学 | Full-size riser fatigue test device |
| CN113237618A (en) * | 2021-04-08 | 2021-08-10 | 天津大学 | Underwater shell modal test method considering internal flow field and pressure influence thereof |
| CN113848139A (en) * | 2021-09-22 | 2021-12-28 | 天津大学 | A cyclic loading fatigue test device for pipeline moment of flexure |
| CN113848134A (en) * | 2021-09-22 | 2021-12-28 | 天津大学 | Fatigue test method for circularly applying bending moment to pipeline |
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Cited By (5)
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| CN113237617A (en) * | 2021-04-08 | 2021-08-10 | 天津大学 | Underwater shell modal test device considering internal flow field and pressure influence thereof |
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| CN113237782A (en) * | 2021-04-22 | 2021-08-10 | 天津大学 | Full-size riser fatigue test device |
| CN113848139A (en) * | 2021-09-22 | 2021-12-28 | 天津大学 | A cyclic loading fatigue test device for pipeline moment of flexure |
| CN113848134A (en) * | 2021-09-22 | 2021-12-28 | 天津大学 | Fatigue test method for circularly applying bending moment to pipeline |
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Application publication date: 20210126 |