ASME B31.1B-2006 Says
137.4.5 Required Hydrostatic Test Pressure.
Thehydrostatic test pressure at any point in the piping system
shall not be less than 1.5 times the design pressure,
but shall not exceed the maximum allowable test pressure
of any nonisolated components, such as vessels,
pumps, or valves, nor shall it exceed the limits imposed
by para. 102.3.3(B). The pressure shall be continuously
maintained for a minimum time of 10 minutes and may
then be reduced to the design pressure and held for such - (This time depends upon project requirement- Max 2 hrs)
time as may be necessary to conduct the examinations
for leakage. Examinations for leakage shall be made of
all joints and connections. The piping system, exclusive
of possible localized instances at pump or valve packing,
shall show no visual evidence of weeping or leaking
With regards
T.Mahendran,
Tabouk - KSA,
Ph: 059 3423 767.
From: SOHAIB GHNAIMAT <sohaib_cegco@yahoo.com>
To: materials-welding@googlegroups.com
Sent: Sun, December 26, 2010 9:17:20 PM
Subject: Re: [MW:8951] Hydrostatic Test
Dear Larry , usually the holding time for buried Piping should be 2 hours for the strength test and 24 hours for tightness test , while for above ground piping the holding time should be 30 minutes to two hours ( Depends on project Inspection ) providing that ALL welds should be accessible for visual inspection to any leak.
Regards,
Sohaib
From: Larry <quality@unieng.com.au>
To: materials-welding@googlegroups.com
Sent: Wed, December 8, 2010 4:18:47 PM
Subject: [MW:8611] Hydrostatic Test
Hi There,
Is there any table on holding time on hydrostatic test as per ASME B31.3 NFS, or any table in ASME code that would refer to it?
Thanks in advance.
Larry Zarate
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