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Allowable Hydrotest stress

Allowable Hydrotest stress

Allowable Hydrotest stress

(OP)
Can anyone tell how allowable hydrotest stress should be determined for flat heads or tubesheets?

RE: Allowable Hydrotest stress

not sure what you  are meaning..can you explain a bit more what you are looking for..AYBEE

RE: Allowable Hydrotest stress

(OP)
Aybee,

Thank you for your response.

When you perform a hydrotest, you can't apply too high pressure because the stress developed may be excessive. My question is during hydrotest, how high stress can be allowed. On what rule, should the maximum allowable hydrotest stress for flat heads or tubesheets be determined?

kyong

RE: Allowable Hydrotest stress

ASME VIII Div.2 gives a limit of 90% of min.yield stress for general primary membrane stresses and of 135% of yield for primary membrane plus bending stresses.

prex

http://www.xcalcs.com
Online tools for structural design

RE: Allowable Hydrotest stress

(OP)
prex,

Thank you very much.

kyong

RE: Allowable Hydrotest stress

The ASME codes(fired and unfired pressure vessels) will show you the formulae needed to calculate the MAWP's of these item you mentioned.  The hydrostatic test will be at 150% MAWP.

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