PASS/EQUIP → Working with PASS/EQUIP → Data Export and Import → Export of a tank model to Ansys →Model loading as per API-650
When selecting the option “Tank loading according to API-650” in the general data, the model is loaded according to the settings Fig. 1.
The minimum design load on the roof Lr=1.0 kPa is considered as a constant vertical load in the plan, it is applied to the roof elements taking into account the direction of the normal to the surface at the considered point (Lr×cosa).
Uniform snow load Sb=0.84×S, non-uniform snow load depends on roof slope: Su={Sb when q£10°; 1.5×Sb when q>10°}, distributed over the roof sector 135° in the plan.
The design wind pressure on the shell PWS=0.89×(V/190)2, is applied as a horizontal load from the windward side, taking into account the direction of the normal: Fx=PWS×Al×cosa, where Al is the area of the considered wall element.
The design wind uplift pressure on the roof is PWR=1.48×(V/190)2, applied as internal pressure to the roof elements (normal to the surface at the considered point)..
Fig. 1. Model loading as per API-650