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.
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
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