Regarding pressure testing of valves and pipelines
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This post was last edited by Wanghai de Ri on 2015-11-3 at 11:13. The test pressure for the valve housing is 1.5 times the maximum operating pressure; the test pressure for the valve seal is 1.1 times the maximum operating pressure. The test pressure for the pipelines is 1.5 times the maximum operating pressure. How should testing of pipelines and valves be handled together? What multiple of pressure should it be? How to consider the test pressure between the valve body and the pipeline flange gaskets
1.5 times the valve’s pressure is used for the strength test, which is intended to ensure that no medium leaks out; this serves the same purpose as that of a pipeline, acting like a section of pipe. The sealing test pressure, on the other hand, relates to the issue of sealing at the internal connections； Therefore, if the pipeline is pressurized along with the valves, all valves can be opened and pressurized at 1.5 times the standard pressure; the pressure on the gaskets should be equal to the pressure required for testing the pipeline as well as the strength limit of the valves, that is, 1.5 times that value
So if the pipelines are pressurized along with the valves, all the valves can be opened and pressurized at 1.5 times the normal pressure; can the seals in areas such as the valve stems withstand a pressure of 1.5 times the normal hydraulic pressure? When valves leave the factory, their sealing performance is generally designed to be 1.1 times higher than required
For valves included in the pressure testing pipeline, these valves must be in the open position. The pressure level is determined based on the pipeline test pressure; generally, the specifications, models, and poundage of the gaskets, along with the corresponding flanges, are sufficient
If the experimental pressure exceeds the valve’s capacity, the valve should be removed and replaced with a short section
The test pressure for the valve housing is 1.5 times the maximum operating pressure; the test pressure for the valve seal is 1.1 times the maximum operating pressure. The test pressure for the pipelines is 1.5 times the maximum operating pressure, and when testing both the pipelines and the valves together, the highest of these values should be used as the test pressure.