Method for detecting hydrostatic pressure of thin-wall steel pipe under end face seal condition

Abstract

The invention relates to a method for detecting the hydrostatic pressure of a thin-wall steel pipe under the end face seal condition. Used equipment is an end face seal steel pipe hydrostatic pressure testing machine which comprises a testing machine body, a hydraulic system, a water pressure system and an electric control system. The method for detecting the hydrostatic pressure of the thin-wall steel pipe under the end face seal condition comprises the following steps of: 1) feeding the pipe and pre-clamping, namely respectively sealing the two pipe orifices of the pressure test thin-wall steel pipe by using two seal flat gaskets on a main pressure test head body and an auxiliary pressure test head body; 2) filling water, namely filling low-pressure water into the pressure test thin-wall steel pipe, exhausting, and closing a low-pressure water inlet valve, an exhaust port and a pressure relief port; 3) pressurizing, namely supplementing the water to the pressure test thin-wall steel pipe for pressurizing, pressurizing a main hydraulic cylinder synchronously, and determining a test pressure value according to a calculation formula; 4) stabilizing pressure, namely after the pressure of the water in the pressure test thin-wall steel pipe reaches a specified test pressure value, stabilizing the pressure until time specified by the test is up; and 5) relieving the pressure and discharging the water and the pipe. The detection method overcomes the defects of the conventional pipe making specifications, and the calculation process is simple, convenient and reliable.

Description

technical field [0001] The invention relates to the field of a thin-walled steel pipe hydrostatic pressure testing machine and a thin-walled steel pipe hydrostatic pressure detection method, in particular to a method for testing the pressure bearing capacity of a thin-walled steel pipe with a diameter-thickness ratio greater than 20 for transporting fluids such as oil and natural gas An end face seal hydrostatic pressure testing machine and a method for detecting hydrostatic pressure of a thin-walled steel pipe under the end face seal condition. Background technique [0002] In order to ensure the safe and reliable operation of steel pipes for oil and natural gas pipeline transportation, hydrostatic pressure tests must be carried out during the manufacturing process of steel pipes for transportation to test the pressure bearing capacity and reliability of steel pipes. At present, the hydrostatic pressure test equipment for steel pipes used by many steel pipe manufacturers is...

AI Technical Summary

Problems solved by technology

[0006] The purpose of the present invention is to provide a detection method for the hydrostatic pressure of thin-walled steel pipes, which can effectively solve the pressure detection problem of the hydrostatic pressure test of thin-walled steel pipes under the condition of end face sealing

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