CN106503303B - A kind of composite material enhancing metallic conduit design pressure calculation method - Google Patents
A kind of composite material enhancing metallic conduit design pressure calculation method Download PDFInfo
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Abstract
The invention discloses a kind of design pressure calculation methods of composite material enhancing metallic conduit, when composite material enhances metallic conduit pressure-bearing, bearing capacity is the adduction of composite material and metallic conduit bearing capacity, therefore when being designed calculation of pressure to pipeline, the method for choosing double design ratios, it is that design ratio is different from taking 0.5 to entire pipeline before, a design ratio is determined to metal layer and composite layer respectively, the design pressure of tubing is calculated.Wherein the design ratio of metal layer is identical as non-reinforced metallic conduit value method, and the design ratio of composite material enhancement layer is calculated by finite element model analysis and experimental study, and value is between 0.2~0.35.The present invention provides calculation method for the design pressure that composite material enhances metallic conduit, and compared with the calculation method in Canadian standard CSA Z662, more meets in all structure sheaf proportional regions with the bearing capacity of practical pipeline.
Description
[technical field]
The present invention relates to a kind of design pressure calculation methods of composite material enhancing metallic conduit.
[background technique]
In high-pressure fluid transportation art, such as the pipeline of natural gas, most-often used is the metallic conduits such as steel pipe, still
With conveyance conduit pressure demand is gradually increased, pipeline needs to improve its bearing capacity, and method used at present includes increasing
Add metallic conduit wall thickness or improves the intensity of pipeline material.The wall thickness for increasing metallic conduit not only increases piping cost, but also
Increase the difficulty of pipeline transportation and construction.Pipeline wall thickness can be thinned to a certain extent by improving pipeline material intensity, still
High-strength material research and development need certain period, and by taking most-often used steel as an example, and the steel crack arrest of higher intensity is poor, easy
Corrosion, and in work progress all there is certain difficulty in the welding and bending of pipeline.
The method for maying be used at the outer wound composite of metallic conduit at present, because under the effect of interior pressure, the ring of steel pipe
To stress (σs) and axial stress (σa) relationship be σs=2 σaIf the wall thickness of steel conduit meets the requirement of axial stress,
So its circumference stress can only meet half, i.e. the internal pressure bearing capacity of steel pipe is limited by its circumference stress.Therefore, pass through
In metallic conduit outer cladding continuous fiber composite material enhancement layer, the circumferential bearing capacity of pipeline is improved, to reach raising pipe
The purpose of road discharge pressure and conveying capacity.
For such pipeline, it is by petroleum that representative a kind of pipeline, which is that composite material enhances pipeline steel tube,
Glass fiber reinforced epoxy resin enhancement layer is coated by the method that continuous fiber is wound outside natural gas pipeline steel tube, reaches and mentions
The effect of high tubing bearing capacity, can be used as high-pressure natural gas long-distance transport pipes.In order to guarantee the safe handling of pipeline, need to pipe
The design pressure in road is calculated, and Canadian standard CSA Z662 is in the 17th Zhang Zhongyou formula to the design pressure of such pipeline
It is calculated, formula is as follows:
In formula, P is design pressure, MPa；D is outer diameter of steel pipes, mm；S is steel pipe minimum yield strength, MPa；T sets for steel pipe
Count wall thickness, mm；T is temperature parameter；ThFor 95% confidence lower limit fibre reinforced composites hoop tensile strength, MPa；W is fibre
The design wall thickness of dimension enhancing composite layer, mm；F is design parameter, is 0.5；L is the product of the parameters such as location parameter.
The design pressure that composite material enhancing pipeline steel tube is calculated using this formula, when enhancement layer is relatively thin, compound pipeline complex pipeline
Design pressure be even lower than the design pressure of inner layer steel pipe.And when the thickness proportion of enhancement layer is larger, pass through this formula meter
Obtained design pressure is bigger than normal compared with testing measured result, this can directly result in the safety problem of pipeline at runtime.It is logical
It crosses finite element model and calculates analysis, and the essential attribute of bonded composite, the selection of 0.5 design ratio has certain do not conform to
Rationality.Since when the long-term stress of composite material is only when within the 40% of its tensile strength, creep will not just occur for material
It destroys, therefore when carrying out pipe design, the stress of composite material is not to be exceeded the 40% of its tensile strength under operating pressure.And
The design ratio of entire tubing is taken as 0.5 by the formula of CSA Z662, i.e., when design pressure calculates, inner layer steel pipe intensity value
It is the 50% of its minimum yield strength, composite material strength value is the 50% of its tensile strength.This algorithm is for steel pipe
It is than more conservative, because the usual value of the design ratio of steel pipe is 0.72 (two class of level-one area), but for composite material
For have certain risk, especially when enhancement layer is thicker, composite portions design pressure calculating in ratio regular meeting
Bigger, calculated result is often bigger than normal, and there are certain irrationalities.
[summary of the invention]
It is an object of the invention to solve above-mentioned problem of the prior art, a kind of composite material enhancing metallic conduit is provided
Design pressure calculation method.When composite material enhances metallic conduit pressure-bearing, bearing capacity is that composite material and metallic conduit are held
The adduction of loading capability, therefore when being designed calculation of pressure to pipeline, the method for choosing double design ratios, and before to entire
Pipeline takes 0.5 as design ratio difference, determines a design ratio respectively to metal layer and composite layer, the design to tubing
Pressure is calculated.Wherein the design ratio of metal layer is identical as non-reinforced metallic conduit value method, composite material enhancement layer
Design ratio by finite element model analysis calculate and experimental study, value be 0.2~0.35 between.
In order to achieve the above objectives, the present invention is achieved by the following scheme:
A kind of design pressure calculation method of composite material enhancing metallic conduit, calculates according to following formula:
Wherein: P is design pressure, unit MPa；D is metal pipe outside diameter, unit mm；S is the surrender of metal material minimum
Intensity, unit MPa；T is metal tube design wall thickness, unit mm；T is temperature parameter；ThFor the increasing of 95% confidence lower limit fiber
Strong composite material circumferential direction tensile strength, unit are to be determined by the strength test under highest design temperature, unit MPa；W is fibre
The design wall thickness of dimension enhancing composite layer, unit mm；FmFor metal design ratio；FcFor composite Materials Design coefficient；L is
Location parameter.
A further improvement of the present invention lies in that:
The composite construction pipeline enhances metallic conduit by continuous fiber composite material and forms.
Further include subsequent step, hydraulic bursting test research, verifying are carried out to the design pressure obtained by theoretical calculation
Meet corresponding design requirement.
For the value of the temperature coefficient T according to the respective standard value of inner layer metal pipe, value range is 0.87~1.
For the value of the position parameter L according to the respective standard value of inner layer metal pipe, value range is 0.5~1.
The metal design ratio FmAccording to the specific location of pipe installation and trandfer fluid value, value range 0.4
~0.8.
The composite Materials Design coefficient FcValue range is 0.2~0.35.
The composite Materials Design coefficient FcValue be 0.3.
Compared with prior art, the invention has the following advantages:
The present invention provides calculation method, and and Canadian standard for the design pressure that composite material enhances metallic conduit
Calculation method in CSA Z662 is compared, and is more met in all structure sheaf proportional regions with the bearing capacity of practical pipeline.
[specific embodiment]
Below with reference to embodiment, the present invention is described in further detail.
The design pressure calculation method of composite material enhancing metallic conduit of the present invention, which is characterized in that according to following formula
It calculates:
Wherein: P is design pressure, unit MPa；D is metal pipe outside diameter, unit mm；S is the surrender of metal material minimum
Intensity, unit MPa；T is metal tube design wall thickness, unit mm；T is temperature parameter；ThFor the increasing of 95% confidence lower limit fiber
Strong composite material circumferential direction tensile strength, unit are to be determined by the strength test under highest design temperature, unit MPa；W is fibre
The design wall thickness of dimension enhancing composite layer, unit mm；FmFor metal design ratio；FcFor composite Materials Design coefficient；L is
Location parameter.
For the value of temperature coefficient T according to the respective standard value of inner layer metal pipe, value range is 0.87~1.Position system
For the value of number L according to the respective standard value of inner layer metal pipe, value range is 0.5~1.Metal design ratio FmAccording to pipeline
The specific location and trandfer fluid value of laying, value range are 0.4~0.8.Composite Materials Design coefficient FcValue range is
0.2~0.35, preferably 0.3.
Composite construction pipeline enhances metallic conduit by continuous fiber composite material and forms.Composite material enhances metallic conduit
Design pressure calculation method is suitable for enhancing metallic conduit by autofrettage and the composite material without autofrettage.It is interior
The Mechanics Performance Testing of layer metal tube and enhancing composite material must satisfy the requirement of relevant criterion.
Further include subsequent step, hydraulic bursting test research, verifying are carried out to the design pressure obtained by theoretical calculation
Meet corresponding design requirement.
Examples 1 to 3 gives different enhancement layer wall thickness and uses standard CSA Z662 and the calculated composite wood of the present invention
The design pressure of material enhancing pipeline steel tube.
Embodiment 2~3 gives the measured value of composite material enhancing pipeline steel pipe hydrostatic testing.It is quick-fried for such tubing
Broken safety coefficient takes 2.0, it is desirable that by testing the burst pressure measured divided by the maximum operation pressure obtained after burst safety factor 2
Power should be not less than design pressure.
In Examples 1 to 3, inner layer metal outer diameter tube is 508mm, wall thickness 9.5mm；Inner layer metal pipeline is X65
Grade, minimum yield pressure are 450MPa；Using glass fiber reinforced epoxy resin E51 be composite material, 95%
Confidence lower limit fibre reinforced composites hoop tensile strength is 1000MPa.
In Examples 1 to 3, the design ratio of internal layer pipeline steel tube is according to GB/T 50251-2015 to gas pipeline work
The code requirement of skill design, takes the design ratio of the pipeline steel tube in two class of level-one area, is 0.72；The design ratio of composite material
Take 0.3；Temperature coefficient T and position parameter L take 1.
Embodiment 1
Composite material enhancement layer wall thickness 1mm.
Design pressure according to the composite material enhancing pipeline steel tube calculated in CSA Z662 is 10.4MPa, according to this hair
The design pressure of bright calculating is 13.3MPa, and the design pressure (design ratio takes 0.72) of inner layer steel pipe is 12.1MPa.By with
The design pressure value that upper data can be seen that the composite material enhancing pipeline steel tube obtained using the calculation method of CSA Z662 is low
In non-reinforced steel pipe, it is not inconsistent with actual conditions.
Embodiment 2
Composite material enhancement layer wall thickness 3.58mm.
Design pressure according to the composite material enhancing pipeline steel tube calculated in CSA Z662 is 15.5MPa, according to this hair
The design pressure of bright calculating is 16.3MPa, and the hydraulic bursting test measured value of this specification composite material enhancing pipeline steel tube is
34.5MPa takes 2 calculating, maximum operating pressure 17.3 according to burst safety factor.Above data is compared, passes through CSA at this time
Z662 and design pressure calculation method of the invention all meet test requirements document, i.e. design pressure is calculated lower than test measured value
Maximum operating pressure.
Embodiment 3
Composite material enhancement layer wall thickness 7.3mm.
Design pressure according to the composite material enhancing pipeline steel tube calculated in CSA Z662 is 22.8MPa, according to this hair
The design pressure of bright calculating is 20.7MPa, and the hydraulic bursting test measured value of this specification composite material enhancing pipeline steel tube is
44.8MPa takes 2 calculating, maximum operating pressure 22.4 according to burst safety factor.Above data is compared, CSA Z662 is passed through
The design pressure value being calculated is higher than the maximum operating pressure that test measured value is calculated, and is calculated using the present invention
Data meet corresponding require.
Of the invention solves process:
1) bearing capacity of composite material enhancing metallic conduit is composite material enhancement layer and metal layer under same strain,
The superposition of two structure sheaf stress responses.
2) bearing capacity of inner layer metal pipeline does not generate variation because composite material enhances.
3) composite material enhancement layer fails because of creep in use in order to prevent, and stress, which is used for a long time, to be lower than
The 40% of its tensile strength.
4) it is X65 Grade that table 1, which is inner layer metal pipeline, outer diameter 508mm, when wall thickness 9.5mm pipeline steel tube, if
Meter pressure is 17MPa, calculates design pressure using the enhancement layer thickness of the invention being calculated, and using finite element analysis software
The stress situation of lower two structures.As can be seen from the table, the stress of composite material its tensile strength 30% hereinafter, and
In conjunction with the stress level of steel layer, it is consistent substantially with the design ratio of formula in the present invention.
The stress analysis of 1 same design pressure different structure thickness degree pipeline of table
The above content is merely illustrative of the invention's technical idea, and this does not limit the scope of protection of the present invention, all to press
According to technical idea proposed by the present invention, any changes made on the basis of the technical scheme each falls within claims of the present invention
Protection scope within.
Claims (7)
1. a kind of design pressure calculation method of composite material enhancing metallic conduit, which is characterized in that calculated according to following formula:
Wherein: P is design pressure, unit MPa；D is metal pipe outside diameter, unit mm；S is that the surrender of metal material minimum is strong
Degree, unit MPa；T is metal tube design wall thickness, unit mm；T is temperature parameter；ThFor 95% confidence lower limit fiber reinforcement
Composite material circumferential direction tensile strength, unit are to be determined by the strength test under highest design temperature, unit MPa；W is fiber
Enhance the design wall thickness of composite layer, unit mm；FmFor metal design ratio；FcFor composite Materials Design coefficient, value model
Enclose is 0.2~0.35；L is location parameter.
2. the design pressure calculation method of composite material enhancing metallic conduit according to claim 1, which is characterized in that institute
Composite material enhancing metallic conduit is stated to form by continuous fiber composite material enhancing metallic conduit.
3. the design pressure calculation method of composite material enhancing metallic conduit according to claim 1, which is characterized in that also
Including subsequent step, hydraulic bursting test research is carried out to the design pressure obtained by theoretical calculation, verifying meets corresponding
Design requirement.
4. the design pressure calculation method of composite material enhancing metallic conduit according to claim 1 to 3,
It is characterized in that, for the value of the temperature parameter T according to the respective standard value of inner layer metal pipe, value range is 0.87~1.
5. the design pressure calculation method of composite material enhancing metallic conduit according to claim 1 to 3,
It is characterized in that, for the value of the location parameter L according to the respective standard value of inner layer metal pipe, value range is 0.5~1.
6. the design pressure calculation method of composite material enhancing metallic conduit according to claim 1 to 3,
It is characterized in that, the metal design ratio FmAccording to the specific location of pipe installation and trandfer fluid value, value range 0.4
~0.8.
7. the design pressure calculation method of composite material enhancing metallic conduit according to claim 1, which is characterized in that institute
State composite Materials Design coefficient FcValue be 0.3.
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| CN109086535B (en) * | 2018-08-10 | 2022-11-11 | 临海伟星新型建材有限公司 | Composite pipe strength design method |
| CN109657308B (en) * | 2018-12-05 | 2022-11-22 | 新地能源工程技术有限公司 | Method for calculating pipe fitting design pressure and method for determining pipe fitting wall thickness |
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| US6146482A (en) * | 1998-04-20 | 2000-11-14 | Southwest Research Institute | Method for designing high pressure low cost prestressed composite wrapped transmission line system |
| CN101429857A (en) * | 2008-06-16 | 2009-05-13 | 中国海洋石油总公司 | Design method for maximum torque of well drilling seat suspension liner tube |
| CN101782486A (en) * | 2009-11-06 | 2010-07-21 | 北京隆盛泰科石油管科技有限公司 | Selection method of test sample for steel pipe transverse yield strength test |
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| WO2004094768A2 (en) * | 2003-04-23 | 2004-11-04 | Th Hill Associates, Inc. | Drill string design methodology for mitigating fatigue failure |
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|---|---|---|---|---|
| US6146482A (en) * | 1998-04-20 | 2000-11-14 | Southwest Research Institute | Method for designing high pressure low cost prestressed composite wrapped transmission line system |
| CN101429857A (en) * | 2008-06-16 | 2009-05-13 | 中国海洋石油总公司 | Design method for maximum torque of well drilling seat suspension liner tube |
| CN101782486A (en) * | 2009-11-06 | 2010-07-21 | 北京隆盛泰科石油管科技有限公司 | Selection method of test sample for steel pipe transverse yield strength test |
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