Hydrostatic pressure test system and test method for realizing hydrostatic pressure of steel pipe

Abstract

The invention provides a hydrostatic test system and test method for realizing hydrostatic pressure of a steel pipe. The hydrostatic test system comprises a first seal head and a second seal head which are mounted at two ends of the steel pipe, wherein a pressure maintaining device is arranged on one side of the first seal head, a pressure measuring point is arranged on the first seal head, and a second pipeline is further arranged on the first seal head. After flushing in the steel pipe is completed, the pressure maintaining device is automatically closed under the action of gravity, high-pressure water is added into the steel pipe through the second pipeline, and the pressure maintaining device is sealed. In the steel pipe water filling process of the pressure maintaining device, the valve is automatically opened and closed to achieve sealing, and sealing is reliable. The water in the steel pipe cannot flow back or leak under the sealing of the one-way valve. A high-pressure water pressure measuring point is led out from the end socket to measure the water pressure value in the steel pipe, pressure fluctuation change caused by operation of a valve on a pipeline is reduced, and the accuracy, authenticity and stability of a recorded value are ensured. Therefore, possible leakage points during static pressure maintaining of the steel pipe are reduced, and long-term hydrostatic pressure is achieved.

Description

technical field [0001] The invention relates to the field of steel pipe testing, in particular to a hydrostatic test system and a test method for realizing hydrostatic pressure of steel pipes. Background technique [0002] At present, the steel pipe hydraulic testing machine is a special equipment for hydrostatic testing of oil and gas transmission steel pipes. The steel pipe inspection standard requires that the steel pipes be subjected to hydrostatic pressure tests one by one. After the water pressure value makes the internal stress of the pipe wall reach 95% of its minimum yield strength, the high-pressure water supply device is closed, and the static pressure is achieved by relying on the excellent sealing performance of the hydraulic machine. The holding time is 10-15s, and a smooth curve is recorded by the curve recording software. The existing problems mainly include: from the high-pressure water supply device to the steel pipe, there are pipelines, hydraulic gate va...

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Problems solved by technology

[0004] The invention provides a hydrostatic test system and test method for a steel pipe to realize hydrostatic pressure, which solves the problem that the traditional hydrostatic test is to set a pressure measuring point between the high-pressure water supply device and the steel pipe to measure the water pressure change, and to measure the water pressure change from the high-pressure water supply device to the steel pipe. There are pipelines, hydraulic gate valves, high and low pressure switching water valves and other devices. The above-mentioned many links cannot meet the sealing requirements, and leakage problems are prone to occur

[0005] The invention provides a hydrostatic test system and test method for steel pipes to realize hydrostatic pressure. Another problem to be solved is that in the traditional hydrostatic test, the hydrostatic pressure is realized by closing the valve of the hydraulic gate valve, and various valves on the pipeline are closed or closed. The pressure fluctuation caused by the opening process is large, resulting in inaccurate test values. At the same time, manual operation is required to start the hydraulic gate valve, and it is difficult to achieve hydrostatic pressure for a long time.

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