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Underground tank . ASME Sec Vlll div 1

Underground tank . ASME Sec Vlll div 1

(OP)
I have underground tank with 0.8 m diameter and height 1.7 m . HLL is 1.4 m . Specific gravity of liquid is 1.2 . Internal pressure is Atm and static pressure of liquid . Roof is bolted cover .The design code is ASME sec Vlll dev .1 .

1) how I calculate the thickness of tank ( shell , bottom ).
2) the design of bolted cover has to take the effect of soil load ( density of soil is given ) . Can Anybody advise me how I can consider soil load in design of bolted cover ( roof ) and is it possible to do this using compress software ? Also concrete pavement thickness is given .

Thanks.

RE: Underground tank . ASME Sec Vlll div 1

Internal pressure will be pretty negligible for a tank that small.
Calculate external pressure due to the soil and use that as external pressure on the tank.
Whether Compress can handle the cover- I don't know, the pressure is reversed from a normal flange, and it may or may not be set up to handle that.
Also note that applying a pressure vessel code to non-pressured vessels may give you unreasonable results at times.

RE: Underground tank . ASME Sec Vlll div 1

A little late but here we go. I don't know in which state you have this tank but in my state of MA, there is a MA code requirement for tank minimum wall thickness. Check your state code requirement.

RE: Underground tank . ASME Sec Vlll div 1

One more thing, if the tank is truly built to ASME sect VIII, DIV.1, then there should be a National Board number which can be submitted to the National Board for a copy of the manufacturer's data report. This report will have the wall thicknesses of the shell aand heads.

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