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Fracture controllable natural gas pipeline and ductile fracture control method thereof

A technology of ductile fracture and control method, applied in pipeline systems, gas/liquid distribution and storage, mechanical equipment, etc., can solve the problems of high cost and poor economy, and achieve control of production cost, good economy and safety, and saving. cost effect

Active Publication Date: 2015-04-08
BC P INC CHINA NAT PETROLEUM CORP +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, this method also needs to improve the toughness of the steel pipe while ensuring the strength of the steel pipe. It needs to use a large number of high-toughness steel pipes, and the cost is high and the economy is poor.
In addition, this method is based on the assumption that the steel pipe is completely cracked when the toughness is higher than the specified value, and the crack arrest probability of the pipeline is actually lower than the expected value, so there are certain risks and hidden dangers

Method used

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  • Fracture controllable natural gas pipeline and ductile fracture control method thereof
  • Fracture controllable natural gas pipeline and ductile fracture control method thereof
  • Fracture controllable natural gas pipeline and ductile fracture control method thereof

Examples

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example 1

[0041] Example 1: US DOT49CFR Part 192 stipulates that cracks should be stopped within 5-8 steel pipes, and the corresponding crack stop probability should be above 90% and 99% respectively. According to the battle hyperbolic method, the specified crack arrest toughness of X90 single tube is 305J. If the probability of crack arrest within the length of 8 steel pipes reaches 99%, that is, i=8, P=0.99. Let P c = 0.001, the crack arrest probability of a single running steel pipe is 50%, then the crack arrest probability of the crack arrest pipe can be calculated as p b =0.6914, that is, the probability that the crack arrest pipe toughness is higher than the standard crack arrest toughness of 305J is 69.14%. At the same time, according to the normal distribution law, assuming that the standard deviation is 30J (constrained by the production process), the average toughness of the crack arrester can be calculated as 320J, so as to obtain the toughness index of crack arrester manuf...

example 2

[0042] Example 2: The specified crack arrest toughness of X90 single pipe calculated according to the battle hyperbolic method is 305J. If the probability of crack arrest within the length of 8 steel pipes reaches 99%, that is, i=8, P=0.99. Let P c = 0.001, the crack arrest probability of a single crack arrester pipe is 80%, then the crack arrest probability of the running steel pipe can be calculated as p a =0.4628, that is, the probability that the operating pipe toughness is higher than the standard crack arrest toughness of 305J is 46.28%. At the same time, according to the normal distribution law, assuming that the standard deviation is 30J (constrained by the production process), the average toughness of the running pipe can be calculated as 290J, so as to obtain the toughness index of the running pipe manufacturing. Due to the large number of operating pipes, reducing the toughness requirements of the operating pipes can reduce the cost of steel pipe manufacturing, re...

example 3

[0043] Example 3: The specified crack arrest toughness of X90 single pipe calculated according to the battle hyperbolic method is 305J. Assuming that the crack arrest probability of a single crack arrest pipe is 75%, the probability that the operating pipe toughness is higher than the standard crack arrest toughness of 305J is 45%, P c = 0.001, then the probability of crack arrest within the length of 8 steel pipes is 98.56%. The probability of crack arrest within the specified length can be determined according to the toughness distribution index of the running pipe and crack arrest pipe.

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Abstract

Disclosed are a fracture controllable natural gas pipeline and a ductile fracture control method thereof. The fracture controllable natural gas pipeline comprises i-1 operating pipes and a fracture stop pipe communicated with the (i-1)th operating pipe. According to the method, probability statistics of permutation and combination is performed to obtain a probability extended over the i-1 operating pipes; according to the probability P<ni-1> extending over the i-1 operating pipes and a probability P<c> wherein the operating pipe higher than a required pipe ductility is unable to be facture-stopped, and probabilities of the operating pipes unable to fracture-stopped are acquired; according to single-pipe fracture stop probability P of a fracture stop pipe and the probabilities of the operating pipes unable to fracture-stopped, a fracture stop probability of the fracture controllable natural gas pipeline is obtained; ductile fracture of the fracture controllable natural gas pipeline is controlled according to the fracture stop probability of the fracture controllable natural gas pipeline. The fracture controllable natural gas pipeline has good safety, and fracture of the fracture controllable natural gas pipeline can be controlled by acquiring the fracture stop probability of the fracture controllable natural gas pipeline and the ductility requirement thereof.

Description

technical field [0001] The invention belongs to the field of storage and transportation engineering, and in particular relates to a natural gas pipeline capable of controlling fracture behavior and a ductile fracture control method thereof. Background technique [0002] With the national economy's increasing demand for natural gas, under the background of high pressure and large transport volume, while the strength level of natural gas transmission pipelines is increasing, the requirements for toughness are also getting higher and higher. In addition, the service environment of pipeline steel It is very harsh, which increases the probability of cracks, so it poses higher challenges and requirements for the safe operation of pipeline steel. Under the existing TMCP process, the toughness of pipeline steel is usually improved by fine-grain strengthening. However, the existing pipeline steel has undergone the treatment of ultra-refined grains, and the effect of continuing to us...

Claims

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Application Information

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IPC IPC(8): F17D1/02F17D5/00
Inventor 杨坤李鹤霍春勇吉玲康李炎华马秋荣
Owner BC P INC CHINA NAT PETROLEUM CORP
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