[MW:5646] Re: Hydrostatic pressure testing of piping systems - is it for leak test or for strength test ?

Dear Rahul,

The proof test as mentioned by PED and EN is for proving the
constructions strength and depending on the design rules test pressure
will be about 1.3 - 1.4 times the maximum design pressure and mostly
will run for about 1/2 till 1 hour.

On the other hand the leak test is for proving the structure /
pipeline has no leaks. This does not only consists the piping /
pipeline itself but also al flange connections present in a system and
the applied gasket material.
This leak test is often not mentioned in design codes but mostly a
customer requirement, I have to mention that I'm not known with the
content of ASME B31.3.
Test pressure as well as test duration depends completely on clients
requirements . I know that for pipelines often 24 hours is taken as
test duration. The maximum pressure drop allowed should be agreed in
front of the test but is mostly also specified in client requirements.

Hope this clarify things for you.

Best Regards,

Herman Pieper

On 18 jun, 10:53, "Pisat, R. (Rahul)" <Rahul.Pi...@akzonobel.com>
wrote:
> 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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