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Method for testing pressure of large-diameter extra-long PE pipe

A pipe pressure test and large-diameter technology, which is applied in the direction of applying stable tension/pressure to test the strength of materials, can solve the problems of high manpower and material resources consumption, increase construction time, and large manpower and material resources, so as to reduce manpower and material resources consumption, The effect of reducing construction time

Inactive Publication Date: 2013-05-08
TANGSHAN SANYOU CHEM IND
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, too many pressure test points will increase the construction time and consume a lot of manpower and material resources
Taking FE 100 grade DN800 pipeline as an example, every additional pressure test point will increase the time by 2 days, 10 labors, and material consumption of 5,000 yuan
For the long-distance transportation pipeline measured in kilometers, the consumption of manpower and material resources is quite high

Method used

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  • Method for testing pressure of large-diameter extra-long PE pipe
  • Method for testing pressure of large-diameter extra-long PE pipe
  • Method for testing pressure of large-diameter extra-long PE pipe

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Embodiment Construction

[0020] Describe the present invention in detail below in conjunction with embodiment:

[0021] The following is an example of 0.6 MPa pressure test for FE 100 grade DN800 pipeline.

[0022] A pressure test method for a large-caliber ultra-long-distance PE pipeline, which is carried out according to the following steps:

[0023] 1. Firstly, the construction preparation before the pressure test:

[0024] The firmness and reliability of the support baffle of the head of the pressure test pipe section shall be inspected. During the pressure test, the support facilities are strictly prohibited from loosening and collapsing; the valve shall not be used as a sealing plate.

[0025] When pressurizing, use equipment with metering devices (such as systems including pressurized water pumps, flow meters, pressure gauges, water intake equipment, etc.). 1.3 to 1.5 times the pressure, the diameter of the dial is not less than 150mm.

[0026] The drainage pipeline must also b...

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Abstract

The invention relates to a method for testing pressure of a pipe, and in particular relates to a method for testing pressure of a large-diameter extra-long PE pipe. The method comprises the following steps of: pre-testing the pressure, which is to fill the pipe with water and dip the pipe in water for above 12 hours before testing the pressure of the pipe, later discharge the air in the empty pipe; slowly pressurizing the water pressure of the pipe to the test pressure, and stabilizing the pressure for at least 30min; mainly testing the pressure, which is to quickly discharge the water in the pipe after the step of pre-testing the pressure so as to reduce the pressure, wherein the pressure drop quantity is 10%-15% of the test pressure; calculating the discharged water quantity during the pressure discharge period while reducing the pressure; recording the rest pressure of the pipe once 3min, wherein when the rest pressure of the pipe has rising trend in 30min, the water pressure test result is qualified; or when the rest pressure of the pipe does not have rising trend in 30min, continuously observing for at least 60min, wherein when the pressure drop does not exceed 1 / 30 of the test pressure in the 60min, the water pressure test result is qualified. Compared with the prior art, the method disclosed by the invention reduces the construction time and reduces the consumption of manpower and material resources.

Description

technical field [0001] The invention relates to a pressure test method for a pipeline, in particular to a pressure test method for a large-caliber ultra-long-distance PE pipeline. Background technique [0002] Polyethylene pipe is a thermoplastic material, and the pipe itself has the characteristics of creep and stress relaxation under pressure. Unlike pipes of traditional materials (such as ductile iron, steel, etc.), creep of polyethylene pipes will cause a continuous downward trend in pressure over a period of time. In addition, the temperature change during the hydrostatic test will cause pressure fluctuations. When the pipe diameter and length of the hydrostatic test are quite large, the pressure drop caused by the above reasons is very obvious. The characteristics of PE pipes, such as elasticity, creep under pressure, expansion, and shrinkage under pressure loss, will all be exhibited during the hydraulic test. Therefore, PE manufacturers and all the pressure test req...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01N3/12
Inventor 于国峰赵志和李宏刚李秀芝李月志王伟裴立刚韩志远路春华
Owner TANGSHAN SANYOU CHEM IND
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