Method for maintaining and replacing natural gas pipeline

A natural gas pipeline and pipeline technology, which is applied in the field of natural gas pipeline maintenance and replacement, can solve problems such as waste of liquid nitrogen resources, and achieve the effect of improving replacement efficiency.

Inactive Publication Date: 2019-07-30
CHONGQING UNIVERSITY OF SCIENCE AND TECHNOLOGY
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Once an accident occurs, so much liquid nitrogen is needed for replacement, which is a great waste of liquid nitrogen resources

Method used

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  • Method for maintaining and replacing natural gas pipeline
  • Method for maintaining and replacing natural gas pipeline
  • Method for maintaining and replacing natural gas pipeline

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Embodiment Construction

[0027] The present invention will be further described below in conjunction with the accompanying drawings.

[0028] Such as Figure 1-3 As shown, the present invention discloses a method for repairing and replacing pipes of natural gas pipelines. The method for repairing and replacing pipes includes the following steps: step 1, close the upstream and downstream splint valves in the accident section and vent them, step 2 connect the bypass pipeline, and step 3 weld open Holes are shorted, step 4 is the first layer of isolation bag, step 5 is the rectangular ventilator, step 6 is sealing the opening, step 7 is the second layer of isolation bag, step 8 is the rectangular ventilator, step 9 pipe cutting, step 10 Take the isolation bag and weld the replacement tube.

[0029] The nitrogen used to replace the natural gas in the accident section 6 comes from the vaporization of liquid nitrogen.

[0030] The two T-shaped slots 16 in the rectangular ventilator 15 are arranged symmetr...

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Abstract

The invention discloses a method for maintaining and replacing a natural gas pipeline. The method comprises the following steps of step 1, closing an upstream clamping plate valve and a downstream clamping plate valve of an accident section and emptying; step 2, connecting a bypass pipeline; step 3, welding an open hole for short connection; step 4, downwards putting a first layer of isolating bag; step 5, downwards putting a rectangular ventilator; step 6, sealing the open hole; step 7, downwards putting a second layer of isolating bag; step 8, downwards putting a rectangular ventilator; step9, cutting the pipeline; and step 10, taking out the isolating bags and welding to replace the pipeline. According to the method, the first isolating bag and the second isolating bag are arranged toblock the natural gas in the upstream and downstream pipelines of the accident section, so that the blocking property is improved, the safe pipeline replacement and maintenance operation of the accident section can be guaranteed, the liquid nitrogen consumption can be greatly reduced, the normal transmission of the natural gas is guaranteed, and the production operation is not affected.

Description

technical field [0001] The invention relates to a method for maintaining and changing pipes, in particular to a method for maintaining and changing pipes of natural gas pipelines. Background technique [0002] The use of pipelines to transport natural gas has the advantages of low cost, high efficiency, small transportation loss and controllable risks. In the process of natural gas transportation, with the passage of time, natural gas pipelines will be damaged by natural disasters, pipeline corrosion or third parties, resulting in distortion, corrosion, cracks or breaks in the pipeline, directly causing the interruption of natural gas pipeline transportation, and in severe cases It may cause casualties, damage to the environment and other accidents. When an accident occurs in the pipeline, the pipeline needs to be replaced and repaired. During the maintenance operation, the natural gas in the accident section needs to be replaced to ensure the safety of the pipe replacement...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): F16L55/18F16L13/02
CPCF16L13/02F16L55/18
Inventor 周梅妮
Owner CHONGQING UNIVERSITY OF SCIENCE AND TECHNOLOGY
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