Questions regarding the hydrostatic testing of vertical vessels
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I recently encountered a small issue: I am designing a compressed air storage tank with a design pressure of 0.4 MPa, a design temperature of 50 degrees, and a material of S30408; the hydrostatic test pressure is 0.5 MPa. There is a manhole on the cylinder. The manhole is designed in accordance with HG/T21516; its maximum allowable operating pressure at 20 degrees Celsius is 0.46 MPa. May I ask whether it is still possible to use manholes in accordance with HG/T21516 in situations where the hydrostatic test pressure exceeds the maximum allowable operating pressure of such manholes? Please help take a look, thank you
It can be chosen; the standard for manholes specifies the maximum operating pressure, and it is fine for the hydrostatic test pressure to exceed this maximum allowable operating pressure
Yes, the hydrostatic test pressure can reach up to 1.5 times the maximum allowable operating pressure at normal temperature
Operating pressure, design pressure, maximum operating pressure, test pressure
The hydrostatic test pressure need only be no more than 1.5 times the maximum allowable operating pressure of the manhole flange
For manholes, a higher grade is usually chosen; after all, it is a component that is subject to significant stress, and it is used for inspections, maintenance, and other purposes. Although choosing a higher grade increases costs, it reduces risks.
The data is fine. But there is a small question: is it reasonable to use the \"maximum allowable operating pressure at 20°C\"? Is the design temperature 20°C?
This situation is acceptable. Using a design temperature of 50 degrees and taking the maximum allowable operating pressure at 20 degrees should be fine.