wind pressure for Fitness-For-Service of API 650 tanks
wind pressure for Fitness-For-Service of API 650 tanks
(OP)
thread1452-357698: API-650 Intermediate Wind Girders to Prevent Buckling - Considerations for Full Tank?
A related question regarding wind pressure. When tanks are emmpty, they are liable to blow in. Sure. More so if the shells are not within tolerances. In API 579-1, the Plastic Collapse verification indicates that the wind load case pressure be applied * a factor, but I wonder if this pressure is that mentioned in API 650 where it says "Design wind pressure (PWSand PWR) using design wind speed (V): The design wind pressure on shell (PWS) shall be 0.86 kPa (V/190) 2, ([18 lbf/ft2 ][V/120]2) on vertical projected areas of cylindrical surfaces."
It seems that this pressure distribution can account for overturning, but not for buckling of the plates inward, as can happen during hurricanes in empty tanks. Any ideas on what pressure distributions to use on the cylindrical and conical faces of the tank in a Finite Element simulation?
Thanks a lot!
A related question regarding wind pressure. When tanks are emmpty, they are liable to blow in. Sure. More so if the shells are not within tolerances. In API 579-1, the Plastic Collapse verification indicates that the wind load case pressure be applied * a factor, but I wonder if this pressure is that mentioned in API 650 where it says "Design wind pressure (PWSand PWR) using design wind speed (V): The design wind pressure on shell (PWS) shall be 0.86 kPa (V/190) 2, ([18 lbf/ft2 ][V/120]2) on vertical projected areas of cylindrical surfaces."
It seems that this pressure distribution can account for overturning, but not for buckling of the plates inward, as can happen during hurricanes in empty tanks. Any ideas on what pressure distributions to use on the cylindrical and conical faces of the tank in a Finite Element simulation?
Thanks a lot!





RE: wind pressure for Fitness-For-Service of API 650 tanks
RE: wind pressure for Fitness-For-Service of API 650 tanks
RE: wind pressure for Fitness-For-Service of API 650 tanks
In terms of seismic analysis, would you recommend applying the force and overturning moment from Annex E to a FEA model? If so, where would you apply thee force? Is there a way to capture the effect of sloshing in a quasi-static simulation?
Thanks in advance! Cheers,
RE: wind pressure for Fitness-For-Service of API 650 tanks
RE: wind pressure for Fitness-For-Service of API 650 tanks
Ac -convective spectral accel parameter 0.30795E-01
Ai -impulsive spectral accel parameter 0.17143
?
Thanks in advance for your advice. Cheers,