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" (e.g, how I can say this thank shall be designed for 0.246 Kpag (vacuum) or 0.3 Kpag or 1.5 Kpag, etc ?" If the tank can be freely vented to atmosphere, the pressure drop in the vent goose neck is the design internal / external pressure for the tank. This vent can be sized in such a way as to...

Total Force applied = F. Total area of shell transferring the load to foundation = PI() * D * t . Assuming the force is uniformly distributed around shell circumference: Force per unit circumference = F / (PI()*D) ; But, Stress = Force / area = F/(PI() * D * t) = F/(PI() * D ) * ( 1/t)...

The Client’s comment is correct. The derivation is: Section modulus of shell z = (PI() * D^2 * t) / 4. Stress on shell due to moment = M/z = 4 * M / (PI() * D^2 * t) Force per unit circumference = F = stress * thickness = (+/-) 4 * M / (PI() * D^2) KN/M (This load varies from (+)...

It will be advisable to go for immediate repair of the roof after decommissioning the tank due to following reasons: 1) The bottom deck plate is stressed due to the buoyancy force applied on it by the product in tank. The stresses are usually near the allowable stress under the design...