Membrane structures on tanks became more popular over the last 10 – 20 years. Design calculations can only be carried out by using very advanced FEM computer programs which can calculate both non-linear elastic and geometric non-linear.
The burdening such like wind and snow loads as well as the internal gas pressure is important to take very serious into account. Our engineering office MonoConsult can provide you with these types of calculations.
To illustrate the tension a cover must burden see the pictures below: