Method for determining design coefficient of reinforced thermoplastic pipe (RTP)

A technology that enhances compounding and determines methods, and is applied in computer-aided design, calculation, electrical digital data processing, etc., and can solve problems such as limiting the scope of application, RTP pipes cannot be used, and the strength of RTP pipes cannot be fully utilized.

Active Publication Date: 2016-11-16
BC P INC CHINA NAT PETROLEUM CORP +2
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] Due to the different characteristics of RTP pipes and steel pipes, the current technical standards for oil and gas pipelines cannot be used for RTP pipelines, and the current RTP pipeline standard system cannot be completely copied and applied to oil and ga

Method used

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  • Method for determining design coefficient of reinforced thermoplastic pipe (RTP)
  • Method for determining design coefficient of reinforced thermoplastic pipe (RTP)
  • Method for determining design coefficient of reinforced thermoplastic pipe (RTP)

Examples

Experimental program
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Effect test

Embodiment 1

[0149] Example 1, such as figure 1 As shown, a method for determining the design coefficient of a thermoplastic reinforced composite pipeline described in the embodiment of the present invention, the method includes:

[0150] Step 1, analyze the load l of the thermoplastic reinforced composite pipe, including internal pressure load, bending load, external pressure load, axial tensile load, temperature difference load and combined load, and obtain the distribution state and eigenvalue of each load design variable. At the same time, Analyze the load resistance r of the pipeline according to the material properties of the pipeline, and obtain the distribution state and eigenvalue of each design variable of the load resistance;

[0151] Step 2, establishing the limit state function g, load probability model and resistance probability model under different load conditions, including internal pressure load, bending load, external pressure load, axial tensile load, temperature differ...

Embodiment 2

[0168] Example 2, oil and gas long-distance pipelines can be divided into buried pipelines and open-pit pipelines according to different laying methods. The main load types are divided into five types of loads: internal pressure load, bending load, external pressure load, axial tensile load and temperature difference load; the statistical principle of the probability model of each load is based on the concept of design reference period and extreme load .

[0169] Under the internal pressure load, the resistance r is the burst pressure, and the load l is the internal pressure of the pipeline.

[0170] The resistance probability model satisfies the normal distribution, and the resistance design variables include d, r i 、r o , α, σ bg , σ bp , a, N, combined with the material properties of the pipeline, the geometric parameters of the components and the calculation mode of the resistance, determine the probability distribution of each design variable of the resistance. The p...

Embodiment 3

[0179] Example 3, under bending load, the resistance r is the critical strain ε relative to the local longitudinal bending of the pipeline crit , the load l is the strain ε caused by the bending load th ;

[0180] The limit state function for local buckling due to restricted thermal expansion becomes:

[0181] g=ε crit -ε th (9)

[0182] ϵ c r i t = 0.28 × ( t D m ) / μ z r ; - - - ( 10 )

[0183] ε th = R 0 / R b (11)

[0184] In the formula,

[0185] t is the wall thickness of the pipe; D m is the average diameter of the pipe; μ zr is the Poisson’s ratio in the p...

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Abstract

The invention discloses a method for determining a design coefficient of a reinforced thermoplastic pipe (RTP). The method comprises the following steps: analyzing an internal pressure load, bending load, external pressure load, axial tension load, temperature difference load and combined load of the RTP, and analyzing the load resistance of the RTP; establishing a limit state function, load probability model and resistance probability model under different load conditions; determining an average value, standard difference and variation coefficient of the loads and the resistance; giving a target reliability index, and determining a partial load coefficient and partial resistance coefficient by virtue of a FORM method; determining the design coefficient by virtue of an LRFD method. The method has the beneficial effects that the loads of the RTP are classified into the internal pressure load, the bending load, the external pressure load, the axial tension load, the temperature difference load and the combined load; the target reliability index is combined to form a calculation method for the design coefficient by establishing a limit state equation and establishing the probability models, so that a foundation is laid for the future engineering application of the RTP to an oil and gas transmission pipeline.

Description

technical field [0001] The invention relates to the technical field of pipeline engineering, in particular to a method for determining the design coefficient of a thermoplastic reinforced composite pipeline. Background technique [0002] Steel pipes are mostly used in oil and gas transmission pipelines, but their engineering applications are increasingly restricted due to corrosion problems in the application of steel pipes, difficulties in the production technology of large-diameter high-pressure pipelines, and poor self-cracking performance of high-grade steel pipes. Thermoplastic reinforced composite pipe (RTP) has the characteristics of excellent self-corrosion resistance, good toughness and flexibility, convenient and reliable connection, and smooth pipe wall. It is developing rapidly and will shine in the field of oil and gas transportation engineering applications. Most RTP pipes adopt a three-layer structure, the inner layer is usually a corrosion-resistant and wear-...

Claims

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Application Information

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IPC IPC(8): G06F17/50
CPCG06F30/17G06F30/367G06F2113/14
Inventor 程梦鹏张文伟桑广世耿晓梅王鸿钟桂香韩桂武唐培连窦宏强
Owner BC P INC CHINA NAT PETROLEUM CORP
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