MWAP in FRP storage Tank
MWAP in FRP storage Tank
(OP)
Hello everyone,
I was asked to calculate the MWAP for an FRP storage tank.
Is calculation the same as per API 650?
Thanks,
Rich
I was asked to calculate the MWAP for an FRP storage tank.
Is calculation the same as per API 650?
Thanks,
Rich





RE: MWAP in FRP storage Tank
Regards,
Mike
RE: MWAP in FRP storage Tank
All I have a GA drawing. it says FRP Tank in accordance with spec ASTM 3299.
API 650 is not mentioned anywhere in the drawing.
Thanks,
Rich
RE: MWAP in FRP storage Tank
Is API 650 is not limited to steel fabricated tanks?
Maybe you have to refer to ASME Section X?
Kurt
RE: MWAP in FRP storage Tank
RE: MWAP in FRP storage Tank
ASME X is what FRP pressure vessels get built to. And they are impossible to reverse-engineer. The tensile of the yarn, the winding angles [must be more than one], fill factor, use of 'chop', ester mix and cure conditions all have 'order of magnitude' impacts on the strength of a FPR tank/vessel.
If I had to certify an unknown one, I would fill it 98% (+) full of water and GENTLY pressure it up with air/N2/Ar to 0.5 to 1.0 psi, then certify it to one-third to half of that test pressure. And that constitutes $iss-Poor Engineering. If you want a good one, buy a good one. Doggy doo-doo is tough to certify.
RE: MWAP in FRP storage Tank
These tanks should be operated at atmospheric pressure and provide for extra venting during liquid delivery
Several FRP tanks have failed because the owner/specify failed to include an emergency relief vent on the tank.
http://www.eng-tips.com/viewthread.cfm?qid=363083
MJCronin
Sr. Process Engineer