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Branch line connecting technology adopting no valve during hot tapping

A technology of opening and branching under pressure, applied in branch pipelines, pipes/pipe joints/fittings, pipes, etc., can solve the problems of high valve cost, increased workload, damage, etc., to reduce maintenance and safety hazards, reduce The effect of construction cost and convenient operation

Inactive Publication Date: 2012-11-21
HENAN ZHONGTUO PIPELINE ENG
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0002] In the gas and liquid pipeline transportation system, it is often necessary to install branch pipelines on the main pipeline. In order not to affect the normal transportation of gas and liquid, the pressure drilling facility is often used for the pressure drilling operation, but the pressure drilling operation requires A valve is installed between the main pipeline and the branch pipe. Due to the high cost of the valve, the valve structure is complex, and it is easy to be damaged due to corrosion and other reasons. There are potential safety hazards, and frequent inspections and maintenance are required, which increases the workload.

Method used

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Examples

Experimental program
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Effect test

Embodiment Construction

[0009] A process for connecting branch lines with pressure without valves, comprising the following steps:

[0010] The first step: install the pair of semicircular four-way pipe fittings on the parent pipeline to be drilled and weld them;

[0011] Step 2: Connect the branch line to be connected with the connection port of the four-way fitting;

[0012] Step 3: Install the gate valve, hole opening machine and hole opening connection box at the working port of the four-way pipe fittings, and do a good job of supporting them;

[0013] Step 4: Carry out nitrogen test pressure and leak detection work on four-way pipe fittings, flange welds, gate valves, and open-hole connection boxes. The test pressure is consistent with the operating pressure of the pipeline. Leak detection with a leak detector or soapy water to ensure Press for 10-15 minutes, no leakage is qualified;

[0014] Step 5: Replace the four-way pipe fittings, gate valve, opening connection box and opening machine wit...

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PUM

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Abstract

The invention relates to a branch line connecting technology adopting no valve during hot tapping. The technology comprises the following steps: mounting and welding paired semicircular non-sealing head four-way pipes to a to-be-bored main pipeline; butting to-be-connected branch lines with the connection ports of the four-way pipes; and mounting a temporary bored gate valve, a boring machine and a bored connecting box on operation ports of the four-way pipes while well supporting the temporary bored gate valve, the boring machine and the bored connecting box. The boring machine is used for boring, and is dismantled after the boring is fulfilled; and formation sealing pies and blind plates are mounted on the operation ports. The technology has the benefits that the normal delivery of a pipeline cannot be impacted during the construction process; the technology is simple; the operation is convenient; and no valve is arranged between the main pipeline and branch lines, so as to reduce cost and follow-up maintenance and potential safety hazards.

Description

technical field [0001] The invention relates to a process for opening a hole with pressure and connecting a branch line without using a valve. Background technique [0002] In the gas and liquid pipeline transportation system, it is often necessary to install branch pipelines on the main pipeline. In order not to affect the normal transportation of gas and liquid, the pressure drilling facility is often used for the pressure drilling operation, but the pressure drilling operation requires Installing valves between the main pipeline and the branch pipes requires frequent testing and maintenance, which increases the workload due to the high cost of the valves and the complex structure of the valves, which are easily damaged due to corrosion and other reasons. Contents of the invention [0003] The purpose of the present invention is to provide a valveless pressure drilling device and method that does not need to install valves after opening holes without valves, has simple p...

Claims

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Application Information

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IPC IPC(8): B23D79/00F16L41/08
Inventor 耿树文张庆欢暴来安魏坤士王智慧林冬冬江帅
Owner HENAN ZHONGTUO PIPELINE ENG
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