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Non-Uniform Pressure issue with a Pressure Vessel

Question asked by Liam Griggs on Nov 14, 2012
Latest reply on Nov 27, 2012 by Justin Strempke



I have a "LPG Storage Tank" that is a cylinder with two hemispheres. The height is 2 metres, but the depth of the LPG is 1.8metres, above which is vapour.

The assumed pressure of the vapour is 8bar, would this be a uniform pressure acting on the sections above of 8x10^5 Pa?


My main issue is:

The LPG has a density of 560kg/m^3 and is meant to be modelled using a non-uniform pressure load, up to the 1.8 metres point. Any help regarding how to model this would be very much appreciated. Do I set the Y value to gamma, rho*g (560*9.81)? And does the vapour pressure also apply being the + option with the rest except Y set to zero?

This is what I have tried, as well as modelling the tank as alloy steel with set thickness and applying fixtures to supports at the bottom, but I get warning messages about displacements being too large... I can put some images up if required to make this more understandable if necessary.