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billbusy (Mechanical) (OP)
16 Nov 11 13:15
What's the difference between these two standars/tanks?

I knew 650 is for sotrage tank and 12d/f for production use tank. but still not so clear what's the difference between storage/production tanks.

Should a tank for process facility follow 12d/f not 650 or can be both 12 and 650?

Thanks.
billbusy (Mechanical) (OP)
16 Nov 11 13:20
Generally, I want to know what kind of tanks should follow API 650, what kind of tanks should follow API 12D/F. Thanks
Duwe6 (Industrial)
17 Nov 11 9:28
12F is a 'relaxed' 650 for small, truck transportable & shop-fabricated 'production' tanks that sit out in pastures by wellheads.  The 12F design rules do make an acceptable product, that I feel is better than one designed under UL-143.  Nothing wrong with using 12F tanks in a process unit inside a refinery or chemical plant.

I use an upgraded 12F design -- manway rounded at top, not square as 12F allwos -- for small tanks.  If you look in the back of 12F, there is a limit to how large, both height & diameter, something built under the 12F rules can be.

I use a strict API-650 design at 40 to 50-ft and above, and go to an annular ring above 100-ft diameter.

In the area in between, it depends on the product and location [risk exposure] as to how strict or relaxed the design rules I follow are.  API-650 is a 'perverted' standard IMHO.  There are a number of design details forbidden under 650 & atmosphereic pressure that are fully acceptable on a ASME VIII design at 100 psig.  Just doesn't make good engineering sense, and if you conservatively use good engineering design, you will build a good tank.

Conversly, if the calc's 'just don't look right', you are about to make a big mistake.
billbusy (Mechanical) (OP)
30 Nov 11 15:56
Duwe6, thanks for your clear explanation!

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