I am designing a tank with design pressures -10Kpa/30KPa(-1.45/4.35 psi). The tank is flat bottomed (uniformily supported on the ground).
I was using API 620 but I can't calculate the cylinder under external pressure (view 5.10.5: API620 formulas are not intended to be used for evaluating...
I am designing an atmospheric stainless steel open top tank and the design temperature is 66ºC (150,8ºF).
As it is a stainless steel tank I am applying appendix S of API 650. In section S.3.6, it sais that Appendix M requirements shall be met for stainless steel tanks with design...
When the liquid stored has a lower density than water, must the tank be designed with the density of water in API620?
In API650 ther is no doubt as two thicknesses are calculated, one with density of fluid (design) and another with density of water (hydrostatic test), and your select the higher...
Thanks a lot for your help. I had mistaken the signs of the forces.
Then, my equations should be:
T2 = (P1+Pg)*Rc (P1, Pg and T2 all positive).
T1 = Rc/2*(P1+Pg+W/At) (P1 and Pg positive and W negative)
One last doubt,
"At" is the area of the circunference = pi*(Dtank/2)^2...
Hi JStephen,
I have no vacuum in the tank.
The reason why T1 and T2 are both negative is the hydrostatic pressure of the tank. In all the courses of the shell, except in the top shell course, the hydrostatic pressure (P1, negative sign) is higher than the gas pressure (Pg, positive sign)...
Hi, I am designing a low pressure tank with 9 m of diameter and 13 m of heigth. It is a cylindrical tank with flat bottom and coned roof.
My question is about the application of section 5.10.3.5 when calculating the shell thikness.
In this case, since we have a cylindrical shell, R1=infinity...
