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Calculating MAWP & MAVP for a non-cylindrical Tank

Calculating MAWP & MAVP for a non-cylindrical Tank

Calculating MAWP & MAVP for a non-cylindrical Tank

(OP)
Can any one provide help for calculating the MAWP & MAVP for a rectangular tank to be designed IAW ASME BPVC Sect. VIII, Div. I.

This tank will have both vertically and horizontally internal supports as well as tie-rods. In addition, the internal design pressure is (-)0.5 psig / (+)0.5 psig and is protected by PVRV valve set at (-)4/(+)8 oz/sq. in. In a vent line to atmos.

Any guidance would be greatly appreciated.

RE: Calculating MAWP & MAVP for a non-cylindrical Tank

I suggest as follows:

1. Calculate all stresses according APPENDIX 13 (ASME VIII div 1).

2. Compare all stresses with design stress material, all of them shall be < Sd (design stress material).

3. Remove P (internal design pressure) from all equations, take the lesser value of P as MAWP

4. Repeat this procedure for external pressure to take MAVP (in this case the larger value or more vaccumm).

Regards

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