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## Main Question or Discussion Point

Does anyone know how to calculate the mass of compressed hydrogen tank at certain pressure.

The tank is cylindrical with hemispherical ends.

I have pressure,radius,wall thickness and length,internal volume and density of the material.

The tank is a Type IV tank.(Composite tank with polymer liner.)Is it reasonable to assume that the polymer liner weight is neglible since it is a non-load bearing structure and just there to prevent hydrogen permeation.

Are there any formulas that calculate the weight of the tank valves and regulators and pumps as a factor of the tank weight.

Thanks for your help.

The tank is cylindrical with hemispherical ends.

I have pressure,radius,wall thickness and length,internal volume and density of the material.

The tank is a Type IV tank.(Composite tank with polymer liner.)Is it reasonable to assume that the polymer liner weight is neglible since it is a non-load bearing structure and just there to prevent hydrogen permeation.

Are there any formulas that calculate the weight of the tank valves and regulators and pumps as a factor of the tank weight.

Thanks for your help.