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How do you define a hydro-test pressure based on design pressure?

Hydro-test pressure and holding times vary for different design codes. For example, the ASME SEC VIII Div.1 general hydro-test pressure will be 1.3 x design pressure (minor factors may vary for this equation as well) and for piping design codes, the hydro-test pressure will be ASME B31.4,B31.8 1.5 x design pressure.

Bellows of an expansion joint going through a hydro-test pressure.
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