Verifying static equilibrium ensure that the external forces are balanced correctly by the structure’s internal forces. This is important prerequisites before further analyses with e.g. current, wind and waves and is important in itself.

• Float position: It should be investigated that float position is within acceptable ranges. There need to be sufficient buoyancy also in extreme cases with brackish water. Check that the system floats at the expected draft and don’t sink. In this tutorial we investigated how the floater and tarpaulin displaced vertically and evaluated if this appeared logically given the different fluid densities. Also, how the tarpaulin expanded or shrunk was evaluated.
• Relative pressure: It is noted that pressure differences on the outside relative to the inside matters strongly for the position of the tarpauline. Having fresh water inside means one need the inside water line to be above the outside water line which gives a situation where there is internal overpressure in the tarpaulins upper part while there is external overpressure in the bottom area leading the tarpaulin to deform upwards in the botton and outwards in the upper area. checking the pressure balance is an important take-away from static analysis.
• Water level inside the structure: checking this enable us to find how free-surface level inside is located relative to the outside.