22:03 Apr-12-2009 John O'Brien Consultant, - Chevron ETC , USA, Joined Jan 2000 278
Re: Exemption of Hydro test/Pneumatic testsIn Reply to APPA RAO at 11:31 Apr-05-2009 (Opening).
if this is for new build vessels then you have problems getting around the requirements. Most codes pretty much insist unless the test poses a risk to the vessel or environment - for example hydrotesting a refractory lined vessel would be apoor choice. If this is for an in-service requirement post repair or replaceemnt you have more options. Look to API 510 to give guidance. You need to work with a pressure vessel engineer and NDE specialist to detrmine if the appied NDE can justify waiving the test.
04:27 Apr-13-2009 R Duwe NDT Inspector, API-510, 570, 653 MISTRAS, USA, Joined Jan 2009 148
Re: Exemption of Hydro test/Pneumatic testsIn Reply to John O'Brien at 22:03 Apr-12-2009 .
Mr. O'Brien covered this pretty well. For vessels already in service, API-510 requires the concurrence of a 510 certified Inspector [who has inspected your vessel] and a pressure vessel engineer. For new ASME vessels the Inspector would be the Authorized Inspector.