Plugging pressure testing device and plugging pressure testing method applicable to middle and high pressure gas pipes

Abstract

The invention provides a plugging pressure testing device applicable to middle and high pressure gas pipes and relates to the field of gas engineering. The plugging pressure testing device comprises a detecting device, a power device, an elastic cushion and a pressing plate, wherein the power device comprises a cylinder block, a cylinder cover, a piston and a piston rod; a chamber is formed in the cylinder block, the cylinder block is provided with a first end face and a second end face, and the piston rod comprises a first end and a second end; the piston is fixedly connected with the piston rod, and the piston rod penetrates through the cylinder block; and a gas guiding hole is formed in the piston rod in an axial direction, and the elastic cushion is arranged between the pressing plate and the first end face. The plugging pressure testing device provided by the invention is simple in structure and convenient to use, can be quickly butted with a gas pipe and can be tightly fitted with the inner wall of the gas pipe by virtue of the power device, so that the plugging effect is good, and leakage can be effectively prevented; and gas pressure and gas in the plugged gas pipe can be accurately measured through the gas guiding hole in the piston rod. Based on the plugging pressure testing device applicable to the middle and high pressure gas pipes, the invention also provides a plugging pressure testing method.

Description

technical field [0001] The invention relates to the field of gas engineering, in particular to a plugging and pressure testing device and a plugging and pressure testing method suitable for medium and high pressure gas pipes. Background technique [0002] In the process of overhauling and installing gas pipes, in order to ensure the safety of gas transportation, it is necessary to conduct pressure test inspections on the gas pipes to ensure that there is no leakage of the gas pipes and the safety performance of the use. The pipeline can be put into normal transmission and distribution operation. [0003] In the existing technology, in the process of pressure test inspection, due to the complicated operation of the pressure test device, and in the process of plugging and pressure test, gas leakage is very easy to occur, and because at the construction site, Especially in gas emergency operations, there are different working conditions of various types of work, and the situat...

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Problems solved by technology

[0003] In the existing technology, in the process of pressure test inspection, due to the complicated operation of the pressure test device, and in the process of plugging and pressure test, gas leakage is very easy to occur, and because at the construction site, Especially in gas emergency operations, there are different working conditions of various types of work, and the situation on site is relatively complicated. Once gas leakage occurs due to improper operation, it will cause quite serious accidents

[0004] Moreover, the existing inspection methods need to install a plugging device during the detection process and remove the plugging device during the pressure test. This process is complicated and repetitive, and hot welding operations must be performed. It takes a long time and the labor rate is not high

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