Re: [MW:9771] holding time

If you are hydro testing a vessel made of Sec. VIII, pls. referer UG 99 afor hydro test and UG 100 for Pneumatic test.

Generally its 1.3 times the MAWP X St / S (i.e Stress value S for the test temp on the vessel to stress value S fo the design temp.)

You can use pneumatic test in lieu of hydro if the conditions doesn't allow to use water. in this case its 1.1 times the MAWP X St/S

No specific holding time, it shall be pr. tested till we complete the visual  inspections for leaks

Cheers

MM

On Sun, Feb 6, 2011 at 3:52 PM, Ilangkumaran Kumarasamy <ilangkumaran.kumarasamy@borouge.com> wrote:

Dear experts,

 

                     Kindly share me the details

 

What is the holding time for vessel while conducting hydro testing and how to select the fluids? I knew it is 10 minutes if its piping if possible provide the code and para. Something like design pressure X 1.25………..

 

Thank you,

Ilan

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