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Hi-Spec Systems
we are specialised in the design, development and manufacture of Phased Array and Time-of-Flight Diffraction (ToFD) ultrasonic inspection systems.
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Technical Discussions
Ashish
Ashish
05:39 Nov-26-2008
Hydrotest of Sphere

Dear

We just need to know how much time duration required for doing hydotest of Sphere
Dia - 15.4meters

Regards

Ashish


 
 Reply 
 
Roger D
NDT Inspector, API-510, 570, 653
MISTRAS, USA, Joined Jan 2009, 148

Roger D

NDT Inspector, API-510, 570, 653
MISTRAS,
USA,
Joined Jan 2009
148
02:31 Dec-09-2008
Re: Hydrotest of Sphere
----------- Start Original Message -----------
: Dear
: We just need to know how much time duration required for doing hydotest of Sphere
: Dia - 15.4meters
: Regards
: Ashish
------------ End Original Message ------------
The standard [& traditional] ASME vessel test time is 10 minutes at overload [the full test pressure with any temperature/mat'l stress corrections figured in]. This is just a 'usual & customary' time. If it's going to fail, it'll happen IMMEDIATLY.

Do not allow the pressure gauge(s) to be unattended for even a minute at overload. Spheres vent well, and sunshine on a well vented vessel can cause MAJOR increases in test pressure, just due to the expansion of the water.

Some company spec's call for a 1-hour hold at test pressure, but this is just added danger. Overload it, hold it at overload for a very few minutes, drop the pressure down to Design [or a little above Design] & imspect for leaks and other problems. If you're feeling suicidial, do the visual inspection at full Overload. There's a reason that ASME Sect. VIII now recommends waiting until the pressure has been decreased to do the close-up inspection.



 
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