Aramco do allow the use of pneumatic test if hydro is not possible
(the procedure is well documented in aramco procedure). ive used
pneumatic test on several occasion and have experience "boom" (man
its deafening, worse than the bombing run during the gulf war)
thrice (not once, not twice) with no loss injury or damage to
property in oil/gas environment.
basically if there is a safety procedure governing its use and
trained personnel are available - then go for it. If not, then stay
away from performing the test. The b31 offer other alternative test.
- In PipingDesign@yahoogroups.com, elie altawil <eliealtawil@...>
wrote:
>
> Many times when I specified hydrotesting at 110% up to 150% of
MAOP (depending on applicable code) and the client requested that we
modify the test from hydyo to pneumatic test for economical reasons.
I typically refer the client to the applicable code section on
pneumatic testing and decline to issue an official procedure.
>
> The reasoning behind this is that the test is to proof that the
pipe is strong enough to sustain the pressure and rupture is
possibility, the reason we are doing the test.
>
> For water under 100 psi the water expand very little after a
failure. For gas the volume will expand by (100+14.7)/14.7 = 7.8
time.
>
> Pneumatic test is OK on lines 3/4"NPS or smaller that are
intended for instrument gas line.
>
> _____________________________
> Elie Al-Tawil, Colorado USA
> Former Saudi Aramco Employee
> Mech Engineer, 20 yrs oil/gas
>
>
>
> ---------------------------------
> Blab-away for as little as 1ยข/min. Make PC-to-Phone Calls using
Yahoo! Messenger with Voice.
>
> [Non-text portions of this message have been removed]
>
Received on Mon Apr 10 05:28:00 2006