I am designing a sulfur storage tank. It has a design tempetature of 160 deg. C.
The tank needs to be Post weld heat treated as per material requirements.
There will be an expansion of the tank shell and the bottom during PWHT process. There is a need to provide a slot in the anchor chair top...
Appendix R of API 650 gives the load combinations to be considered for combined stress analysis for the shell.
I assume that we have to calculate the stress induced due to various loads like:
Dead load : DL
Design External pressure : Pe
Design Internal Pressure : Pi
Live Load : Lr
Seismic Load...
As per Add4 in the formula for calculating Impulsive natural period (Ti) the term E(elastic modulus for the tank material) is in the denominator.
But as per API 650 11th Edition 2007 the term E is in the numerator. If we use E in the numerator then the Impulsive time period comes in days.
If...
Before Add 4 of API 650 was introduced we used to take horizontal force acting on the roof which is equal to 15 lbs/ft^2. But Add 4 of API 650 says there is an uplift pressure of 30 lbs/ft^2 acting on the roof due to wind.
Such high uplift pressure 30 lbs/ft^2 can occur from inside the tank.
I...
