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Construction method for connecting natural gas pipelines with gas

A construction method and natural gas technology, applied in the direction of pipe/pipe joint/pipe fitting, pipe laying and maintenance, non-removable pipe connection, etc., can solve the problem of no gas connection method, and achieve good economic and social benefits. , the effect of low labor consumption and less preparation work

Active Publication Date: 2010-09-29
中国化学工程第四建设有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Natural gas pipeline operation with gas is essential, but so far there has not been a relatively mature method of taking over with gas

Method used

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  • Construction method for connecting natural gas pipelines with gas
  • Construction method for connecting natural gas pipelines with gas
  • Construction method for connecting natural gas pipelines with gas

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Experimental program
Comparison scheme
Effect test

specific Embodiment 1

[0016] Concrete embodiment 1: the construction method of decompression method with gas connection

[0017] Tee connection: When the connecting branch pipe is smaller than the original main pipe, the connecting pipe is generally a short flange pipe or a valve connected to the short flange pipe.

[0018] Trench for excavation work: Check the distance and relative position between the new pipe and the existing pipe. For ease of operation, the net distance between the pipe and the trench wall shall not be less than 0.8m, and the net distance from the trench bottom shall not be less than 0.5m. A valve well is built behind the gas connection to protect the rear valve.

[0019] Preparation work: close the valves at the two sections of the operation point or the main valve of the pressure regulating cabinet, set up a temporary relief pipe, check whether the valve in the valve well is working normally, check the gas pressure detection point set up on the operation site, and set up a s...

specific Embodiment 2

[0038] Specific embodiment 2: The construction method of connection with gas without depressurization method

[0039] Suitable for medium and low pressure natural gas pipelines with gas connections. That is, the gas pressure of the original gas pipeline does not decrease, and the pressure is about 300Pa. Drill a hole on the original main pipe with an air drill. When the branch pipe is less than 80mm, tap the thread after drilling the hole and connect it with a screw. When the branch pipe is larger than 80mm, the welding form should be adopted, and the operation procedure is the same as that of the depressurization method.

[0040] The construction equipment of the present invention with a gas takeover operation point:

[0041] serial number

[0042] The labor force organization of the operating point with the gas connection pipe of the present invention:

[0043] serial number

[0044] Equipment and materials required for construction of the present i...

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Abstract

The invention relates to a construction method for connecting natural gas pipelines with gas, which comprises the following steps: excavating an operating spot groove at the selected spot; after excavating the groove to the given requirement, prefabricating stub pipes and junction valves of branch pipes, closing the valves on both sides of the operating spot, putting scattered pipes to reduce pressure, and observing the pressure in the pipes; after the pressure drops to the specified standard, drawing the opening position on the main pipe, carrying out oxweld cutting, removing the pipe wall, welding the prefabricated pipe sections, and replacing with new pipelines; after replacing with the new pipelines, detecting leakage with soap solution, carrying out anti-corrosion treatment at the joints, and restoring gas supply; and finally, laying a valve well, backfilling the pipe groove, and restoring the road surface, thereby completing the whole pipe connecting construction with gas. By using the invention, reliability, economical efficiency, safety and the like of the whole construction process are improved, and the whole construction process is simple in operation, less in preparation work, light in labor intensity and low in labor consumption. Each construction spot only needs about 5 persons, the construction only takes a half day and only needs common equipment, such as welders, electric drills, mobile phones and the like.

Description

technical field [0001] The invention relates to a construction and installation method of an urban natural gas pipeline, in particular to a construction method of a natural gas pipeline with a gas connection. Background technique [0002] After the natural gas gas pipeline is put into use, due to the development of users and the construction of urban roads, it is necessary to carry out the extension of the main pipe and the opening of the branch pipe, the end user with gas connection, and the overhaul of the pipeline. Natural gas pipeline operation with gas is essential, but so far there has not been a relatively mature method of taking over with gas. And natural gas is a kind of flammable, explosive, and harmful gas to human health. Once leaked, it will directly endanger the safety of people's lives and property. In the current construction market, it is the general trend to win bids at low prices while ensuring quality and safety while reducing costs and increasing benefi...

Claims

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Application Information

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IPC IPC(8): F16L1/00F16L13/02
Inventor 孙韵刘欣欣毛瑞芳黄利华
Owner 中国化学工程第四建设有限公司
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