Hydraulic test strength verification
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The national standards include checks on the strength of hydraulic tests; in which chapter are the checks on the strength of pipe ends specified? Also, what are the verification criteria in the American standards, and in which chapter are they? We have a device with a design pressure of 20 Mpa, and a hydrostatic test pressure of 1.5 times that value. How should we calculate the strength verification, specifically for the pipe connections (according to American standards)? The manufacturer says that the strength is twice the yield strength – is that possible? Furthermore, will an extended hydrotesting time cause damage to the equipment?
This post was last edited by Fenfa Shangxiang Chemical Workers on 2020-8-18 at 17:10. It’s not possible. If there is no margin in the design, would you dare to use it? The design cannot exceed the yield strength
Is this a high-pressure pipeline? For containers, a value of 1.25 is generally used taking temperature corrections into account… I haven’t seen any specifications regarding the verification of pipe ends, but generally, for flanges, the value should not exceed 1.5 times the maximum allowable pressure at the operating temperature; it’s also necessary to take into account the conditions of the fasteners as well
Standard pipe flanges generally do not have sufficient strength, as they are designed based on engineering experience
The verification is the same as that for steel pipes and cylinders; for connection flanges, it should not exceed 1.5 times the maximum allowable operating pressure at the test temperature. For container flanges, refer to the \"Training Manual for Pressure Vessel Design Engineers – Basic Knowledge and Components\".