Why is the design pressure for some devices 7.15, while the hydraulic test pressure (in horizontal position) is 11
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The last edit to this post was made by mhg111 on 2010-12-28 at 14:41. Why is the design pressure for some devices 7.15, while the hydraulic test pressure (when the device is in a horizontal position) is 11; in other cases it’s 9. Why?
The hydraulic test pressures are all 1.5 times the design pressure, which is nothing unusual.
Gasifier? Is 11 the hydrostatic test pressure? It seems to be more than 1.5 times. Are there any relevant standards to explain this?
When selecting the test pressure, attention should be paid to the temperature coefficient (see standard: GB-50235). The hydrostatic test pressure is Ps = 1.5P1/2 (allowable stress of the pipe at the test temperature / allowable stress of the pipe at the design temperature). A hydrostatic test pressure slightly greater than 1.5 times the design pressure indicates that the test temperature is lower than the design temperature, which is normal.
Go to the resource sharing area; there should be materials on this topic there. I don’t have it on hand, sorry