CN106503303A - A kind of composite strengthens metallic conduit design pressure computational methods - Google Patents
A kind of composite strengthens metallic conduit design pressure computational methods Download PDFInfo
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- CN106503303A CN106503303A CN201610868067.6A CN201610868067A CN106503303A CN 106503303 A CN106503303 A CN 106503303A CN 201610868067 A CN201610868067 A CN 201610868067A CN 106503303 A CN106503303 A CN 106503303A
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Abstract
The invention discloses a kind of composite strengthens the design pressure computational methods of metallic conduit, when composite strengthens metallic conduit pressure-bearing, bearing capacity be composite and metallic conduit bearing capacity plus and, therefore when calculation of pressure is designed to pipeline, the method for choosing double design ratios, different for design ratio from taking 0.5 before to whole pipeline, a design ratio is determined respectively to metal level and composite layer, the design pressure of tubing is calculated.Wherein the design ratio of metal level is identical with not enhanced metallic conduit value method, and the design ratio of composite enhancement layer is calculated by finite element model analysis and experimental study, and value is between 0.2～0.35.The present invention provides computational methods for the design pressure of composite enhancing metallic conduit, and compared with the computational methods in Canadian standard CSA Z662, more meets with the bearing capacity of actual pipeline in all structure sheaf proportions.
Description
【Technical field】
The present invention relates to a kind of composite strengthens the design pressure computational methods of metallic conduit.
【Background technology】
In high-pressure fluid transportation art, the such as pipeline of natural gas, most-often used is the metallic conduits such as steel pipe, but
With gradually stepping up to conveyance conduit pressure demand, pipeline needs to improve its bearing capacity, and the method for using at present includes increasing
Plus the intensity of metallic conduit wall thickness or raising pipeline material.The wall thickness for increasing metallic conduit not only increases piping cost, and
Increased the difficulty of pipeline transportation and construction.Improve pipeline material intensity can thinning pipeline wall thickness to a certain extent, but
High-strength material research and development need certain cycle, and by taking most-often used steel as an example, the steel crack arrest of higher intensity is poor, easy
Corrosion, and in work progress all there is certain difficulty in the welding of pipeline and bending.
The method of metallic conduit outer wound composite is usable at present, because under the effect of intrinsic pressure power, the ring of steel pipe
To stress (σs) and axial stress (σa) relation be σs=2 σaIf the wall thickness of steel conduit meets the requirement of axial stress,
So its circumference stress can only meet the intrinsic pressure bearing capacity of half, i.e. steel pipe and be limited by its circumference stress.Therefore, pass through
In metallic conduit outer cladding continuous fiber composite material enhancement layer, the ring bearing capacity of pipeline is improved, pipe is improved so as to reach
Road discharge pressure and the purpose of conveying capacity.
For such pipeline, a representative class pipeline is that composite strengthens pipeline steel tube, is by oil
Glass fiber reinforced epoxy resin enhancement layer is coated by the method that continuous fiber winds outside natural gas pipeline steel tube, is reached and is carried
The effect of high tubing bearing capacity, can be used as high-pressure natural gas long-distance transport pipes.In order to ensure the safe handling of pipeline, need to pipe
The design pressure in road is calculated, and Canadian standard CSA Z662 has design pressure of the formula to this kind of pipeline in the 17th chapter
Calculated, formula is as follows：
In formula, P is design pressure, MPa；D is outer diameter of steel pipes, mm；S be steel pipe SMYS, MPa；T is set for steel pipe
Meter wall thickness, mm；T is temperature parameter；ThFor 95% confidence lower limit fibre reinforced composites hoop tensile strength, MPa；W is fibre
Dimension strengthens the design wall thickness of composite layer, mm；F is design parameter, is 0.5；L is the isoparametric product of location parameter.
The design pressure that composite strengthens pipeline steel tube, when enhancement layer is relatively thin, compound pipeline complex pipeline are calculated using this formula
Design pressure be even below inner layer steel pipe design pressure.And when the thickness proportion of enhancement layer is larger, by this formula meter
The design pressure for obtaining is bigger than normal compared with test measured result, and this can directly result in pipeline safety problem operationally.Logical
Cross FEM (finite element) model and calculate analysis, and the base attribute of bonded composite, the selection of 0.5 design ratio has certain not conforming to
Rationality.As when the long-term stress of composite is only within the 40% of its tensile strength, material will not just occur creep
Destruction, therefore when pipe design is carried out, under operating pressure, the stress of composite is not to be exceeded the 40% of its tensile strength.And
The formula of CSA Z662 is taken as 0.5 the design ratio of whole tubing, i.e., when design pressure is calculated, inner layer steel pipe intensity value
For the 50% of its SMYS, 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 one-level area), but for composite
For have certain risk, especially when enhancement layer is thicker, composite portions design pressure calculating in ratio regular meeting
Bigger, result of calculation is often bigger than normal, there is certain irrationality.
【Content of the invention】
It is an object of the invention to solving above-mentioned problem of the prior art, there is provided a kind of composite strengthens metallic conduit
Design pressure computational methods.When composite strengthens metallic conduit pressure-bearing, bearing capacity is that composite and metallic conduit hold
Loading capability plus and, therefore when calculation of pressure is designed to pipeline, the method for choosing double design ratios, with before to whole
Pipeline takes 0.5 for design ratio difference, determines a design ratio, the design to tubing respectively to metal level and composite layer
Pressure is calculated.Wherein the design ratio of metal level is identical with not enhanced metallic conduit value method, composite enhancement layer
Design ratio calculated by finite element model analysis and experimental study, value be 0.2～0.35 between.
For reaching above-mentioned purpose, the present invention is employed the following technical solutions and is achieved：
A kind of composite strengthens the design pressure computational methods of metallic conduit, calculates according to equation below：
Wherein：P is design pressure, and unit is MPa；D is metal tube external diameter, and unit is mm；S is the minimum surrender of metal material
Intensity, unit are MPa；T is metal tube design wall thickness, and unit is mm；T is temperature parameter；ThIncrease for 95% confidence lower limit fiber
Strong composite ring tensile strength, unit is to be determined by the strength test under highest design temperature, and unit is MPa；W is fibre
Dimension strengthens the design wall thickness of composite layer, and unit is mm；FmFor metal design ratio；FcFor composite Materials Design coefficient；L is
Location parameter.
The present invention is further improved by：
The composite construction pipeline strengthens metallic conduit by continuous fiber composite material and forms.
Also include subsequent step, hydraulic bursting test research is carried out to the design pressure obtained by Theoretical Calculation, verify
Meet corresponding design requirement.
Respective standard value of the value of the temperature coefficient T according to inner layer metal pipe, span are 0.87～1.
Respective standard value of the value of the position parameter L according to inner layer metal pipe, span are 0.5～1.
The metal design ratio FmAccording to particular location and the conveyance fluid value of pipe installation, span is 0.4
～0.8.
The composite Materials Design coefficient FcSpan is 0.2～0.35.
The composite Materials Design coefficient FcValue be 0.3.
Compared with prior art, the invention has the advantages that：
The present invention provides computational methods, and and Canadian standard for the design pressure that composite strengthens metallic conduit
Computational methods in CSA Z662 are compared, and are more met with the bearing capacity of actual pipeline in all structure sheaf proportions.
【Specific embodiment】
With reference to embodiment, the present invention is further detailed explanation.
Composite of the present invention strengthens the design pressure computational methods of metallic conduit, it is characterised in that according to equation below
Calculate：
Wherein：P is design pressure, and unit is MPa；D is metal tube external diameter, and unit is mm；S is the minimum surrender of metal material
Intensity, unit are MPa；T is metal tube design wall thickness, and unit is mm；T is temperature parameter；ThIncrease for 95% confidence lower limit fiber
Strong composite ring tensile strength, unit is to be determined by the strength test under highest design temperature, and unit is MPa；W is fibre
Dimension strengthens the design wall thickness of composite layer, and unit is mm；FmFor metal design ratio；FcFor composite Materials Design coefficient；L is
Location parameter.
Respective standard value of the value of temperature coefficient T according to inner layer metal pipe, span are 0.87～1.Position is
Respective standard value of the value of number L according to inner layer metal pipe, span is 0.5～1.Metal design ratio FmAccording to pipeline
The particular location of laying and conveyance fluid value, span are 0.4～0.8.Composite Materials Design coefficient FcSpan is
0.2～0.35, preferably 0.3.
Composite construction pipeline strengthens metallic conduit by continuous fiber composite material and forms.Composite strengthens metallic conduit
Design pressure computational methods are applied to the composite enhancing metallic conduit through autofrettage and without autofrettage.Interior
The Mechanics Performance Testing of layer metal tube and enhancing composite must is fulfilled for the requirement of relevant criterion.
Also include subsequent step, hydraulic bursting test research is carried out to the design pressure obtained by Theoretical Calculation, verify
Meet corresponding design requirement.
Embodiment 1～3 gives the composite wood that different enhancement layer wall thickness are calculated using standard CSA Z662 and the present invention
Material strengthens the design pressure of pipeline steel tube.
Embodiment 2～3 gives the measured value that composite strengthens pipeline steel pipe hydrostatic testing.For such tubing, quick-fried
Broken safety coefficient takes 2.0, it is desirable to by testing the burst pressure for measuring divided by the maximum operation pressure obtained after burst safety factor 2
Power should be not less than design pressure.
In embodiment 1～3, inner layer metal outer diameter tube is 508mm, and wall thickness is 9.5mm；Inner layer metal pipeline is X65
Grade, minimum yield pressure are 450MPa；Using glass fiber reinforced epoxy resin E51 be composite, 95%
Confidence lower limit fibre reinforced composites hoop tensile strength is 1000MPa.
In embodiment 1～3, 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 one-level area, is 0.72；The design ratio of composite
Take 0.3；Temperature coefficient T and position parameter L take 1.
Embodiment 1
Composite enhancement layer wall thickness 1mm.
The design pressure for strengthening pipeline steel tube according to the composite calculated in CSA Z662 is 10.4MPa, according to this
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
Upper data can be seen that the composite that the computational methods using CSA Z662 obtain strengthen pipeline steel tube design pressure value low
In not enhanced steel pipe, it is not inconsistent with practical situation.
Embodiment 2
Composite enhancement layer wall thickness 3.58mm.
The design pressure for strengthening pipeline steel tube according to the composite calculated in CSA Z662 is 15.5MPa, according to this
The design pressure of bright calculating is 16.3MPa, and the hydraulic bursting test measured value of this specification composite enhancing pipeline steel tube is
34.5MPa, takes 2 calculating according to burst safety factor, and maximum operating pressure is 17.3.Contrast data above, now by CSA
The design pressure computational methods of Z662 and the present invention all meet test requirements document, i.e. design pressure and are calculated less than test measured value
Maximum operating pressure.
Embodiment 3
Composite enhancement layer wall thickness 7.3mm.
The design pressure for strengthening pipeline steel tube according to the composite calculated in CSA Z662 is 22.8MPa, according to this
The design pressure of bright calculating is 20.7MPa, and the hydraulic bursting test measured value of this specification composite enhancing pipeline steel tube is
44.8MPa, takes 2 calculating according to burst safety factor, and maximum operating pressure is 22.4.Contrast data above, by CSA Z662
Calculated design pressure value is higher than the calculated maximum operating pressure of test measured value, and is calculated using the present invention
Data meet corresponding requirement.
The present invention solves process：
1) composite strengthen metallic conduit bearing capacity be composite enhancement layer and metal level under same strain,
The superposition of two structure sheaf stress responses.
2) bearing capacity of inner layer metal pipeline does not produce change because composite strengthens.
3) in order to prevent composite enhancement layer from failing because of creep in use, its life-time service stress should be less than
The 40% of its tensile strength.
4) table 1 be inner layer metal pipeline be X65 Grades, external diameter 508mm, during wall thickness 9.5mm pipeline steel tubes, if
Meter pressure is 17MPa, using calculated enhancement layer thickness of the invention, and calculates design pressure using finite element analysis software
The stress situation of lower two structures.As can be seen from the table, the stress of composite in its tensile strength less than 30%, and
In conjunction with the stress level of steel layer, it is consistent with the design ratio of formula in the present invention substantially.
The stress analysis of 1 same design pressure different structure thickness degree pipeline of table
Above content technological thought only to illustrate the invention, it is impossible to limit protection scope of the present invention with this, every presses
According to technological thought proposed by the present invention, any change that is done on the basis of technical scheme, claims of the present invention is each fallen within
Protection domain within.
Claims (8)
1. a kind of composite strengthens the design pressure computational methods of metallic conduit, it is characterised in that calculate according to equation below：
Wherein：P is design pressure, and unit is MPa；D is metal tube external diameter, and unit is mm；S is that the minimum surrender of metal material is strong
Degree, unit is MPa；T is metal tube design wall thickness, and unit is mm；T is temperature parameter；ThFor 95% confidence lower limit fiber reinforcement
Composite ring tensile strength, unit are to be determined by the strength test under highest design temperature, and unit is MPa；W is fiber
Strengthen the design wall thickness of composite layer, unit is mm；FmFor metal design ratio；FcFor composite Materials Design coefficient；L is position
Put parameter.
2. composite according to claim 1 strengthens the design pressure computational methods of metallic conduit, it is characterised in that institute
State composite construction pipeline to form by continuous fiber composite material enhancing metallic conduit.
3. composite according to claim 1 strengthens the design pressure computational methods of metallic conduit, it is characterised in that also
Including subsequent step, hydraulic bursting test research is carried out to the design pressure obtained by Theoretical Calculation, checking meets corresponding
Design requirement.
4. the composite according to claim 1-3 any one strengthens the design pressure computational methods of metallic conduit, its
It is characterised by, the respective standard value of the value of the temperature coefficient T according to inner layer metal pipe, span are 0.87～1.
5. the composite according to claim 1-3 any one strengthens the design pressure computational methods of metallic conduit, its
It is characterised by, the respective standard value of the value of the position parameter L according to inner layer metal pipe, span are 0.5～1.
6. the composite according to claim 1-3 any one strengthens the design pressure computational methods of metallic conduit, its
It is characterised by, the metal design ratio FmAccording to particular location and the conveyance fluid value of pipe installation, span is 0.4
～0.8.
7. the composite according to claim 1-3 any one strengthens the design pressure computational methods of metallic conduit, its
It is characterised by, the composite Materials Design coefficient FcSpan is 0.2～0.35.
8. the composite according to claim 7 any one strengthens the design pressure computational methods of metallic conduit, and which is special
Levy and be, the composite Materials Design coefficient FcValue be 0.3.
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN109086535A (en) * | 2018-08-10 | 2018-12-25 | 浙江伟星新型建材股份有限公司 | A kind of multiple tube strength design |
| CN109657308A (en) * | 2018-12-05 | 2019-04-19 | 新地能源工程技术有限公司 | A kind of calculation method of tube design pressure and the method for determining tube wall thickness |
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| US20040221985A1 (en) * | 2003-04-23 | 2004-11-11 | T H Hill Associates, Inc. | Drill string design methodology for mitigating fatigue failure |
| 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 |
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Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN109086535A (en) * | 2018-08-10 | 2018-12-25 | 浙江伟星新型建材股份有限公司 | A kind of multiple tube strength design |
| 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 |
| CN109657308A (en) * | 2018-12-05 | 2019-04-19 | 新地能源工程技术有限公司 | A kind of calculation method of tube design pressure and the method for determining tube wall thickness |
| 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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