During a hydrotest, localized tensile yielding around flaws results in compressive residual stresses upon depressurization. These can persist during subsequent vessel operation at normal operating pressures.
From: materials-welding@googlegroups.com [mailto:materials-welding@googlegroups.com] On Behalf Of Ali Asghari
Sent: Saturday, May 30, 2009 10:37 PM
To: materials-welding@googlegroups.com
Subject: [MW:2285] hydro test
hi
can every body answer two follwing questions?
how hydro test increase the resistance to brittle fracture or failure by crack like flaw?do hydro test decrease residual stress?
regard advance.
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