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MAWP of API 650 Tank

MAWP of API 650 Tank

MAWP of API 650 Tank

(OP)
Hi everyone,

I am trying to determine the MAWP of an API 650 tank with an internal design pressure of 3 IWC. The tank is 15' in diameter and 20' high built in 1972. I'm using E-Tank 2000 to calculate the MAWP and it's telling me the MAWP of the tank is 69.28 IWC (2.5 psi). I am wondering if it is common for a tank's MAWP to be this much higher than the design pressure. Thanks.

RE: MAWP of API 650 Tank

It is certainly permissible if API-650 Appendix F is complied with. My experience suggests that it is not "common" to do this; most tanks that I see are rated for MAWP of +16 oz or less.

RE: MAWP of API 650 Tank

The anchorage of the tank usually controls in small tanks such as the one you have. If your tank has sufficient anchorage, 2.5 psig is not too unusual. I would recommend obtaining an older copy of API 650 and working out some of the calculations by hand. A computer program is no substitute for understanding the standard.

Also, this question is probably better asked in the Storage Tank Engineering forum.

RE: MAWP of API 650 Tank

The pressure design and the combination of pressure and wind/seismic overturn have been changed up quite a bit, so I'd be kind of surprised if a tank was just accidentally good for that pressure. But it's possible. One thing to watch is the anchorage.

RE: MAWP of API 650 Tank

(OP)
Thanks for the help. I used the report given by ETank and it follows API-650 Appendix F. I plugged in another tank that was larger and received a MAWP of about 35 IWC when it also was designed for 3 IWC. I just find it strange that a majority of our tanks were designed for 3 IWC when many are actually much higher.

Does anyone know where I can obtain a copy of APi-650 4th Ed.? Thanks again.

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