edition). This is a strength or proof test - and a leak test at the same
time. Prescribed test pressure is (B31.3, sec. 345.4.2):
P = (1.5 x P x St)/ S - i.e basically 1.5 times design pressure for
systems operating at room temperature.
This is very similar to PED & EN 13480 requiring a minimum test pressure
of 1.43 x design pressure - and another formula (EN 13480-5, 9.3.2-2),
similar to above from ASME, if the piping has a design temperature above
room temperature.
The above tests will both verify the strength - and because of a certain
holding time, where the pressure is monitored and should be constant,
and because of inspection for leakages at for example flange connections
is carried out during the test, it is also a leak test.
ASME B31.3 operates with other types of leak tests - which are test for
leaks. Among these a pneumatic leak test, at max. 1.1 times the design
pressure, or a sensitive leak test (B31.3, 345.8) at the lesser of 15
psi or 25% of the design pressure.
regards
Kristian Lund Jepsen
-----Original Message-----
From: materials-welding@googlegroups.com
[mailto:materials-welding@googlegroups.com] On Behalf Of Pisat, R.
(Rahul)
Sent: 18. juni 2010 10:54
To: materials-welding@googlegroups.com
Subject: [MW:5645] Hydrostatic pressure testing of piping systems - is
it for leak test or for strength test ?
Hello All,
I have one question regarding scope of Hydrostatic pressure testing of
piping systems.
As per ASME B31.3, Hydrostatic pressure testing of the piping systems is
defined as Hydrostatic leak test ie to check each piping system to
ensure tightness.
The PED (97/23/EC) guidelines & EN 13480 pressure piping code ask for
PROOF TESTING, ie by Hydrostatic testing, of the piping systems to check
the Strength & Integrity of the piping systems.
Why there is such difference between the approach/aspect of Hydrostatic
testing ?
If in 31.3, Hydrostatic pressure testing is only defined for check the
tightness ? how can one satisfy the PROOF TEST requirement of PED for
ASME B31.3
Your kind replies will be highly appreciated.
Kind regards
Rahul
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