API 12D vs 650 Tank Design- Anchorage Requirements
API 12D vs 650 Tank Design- Anchorage Requirements
(OP)
API 650 Tank in Colorado, 40'Dia X 24', with 3.5 oz/in^2 requires overturning anchorage. On the other hand, API 12D tank, equal size, equal pressure, same location- I don't see any 12D reference to wind design, seismic design, or anchorage requirements. Am I missing something? How is it justified- equal tanks, one 650 requires anchorage, one 12D no anchorage required?





RE: API 12D vs 650 Tank Design- Anchorage Requirements
On the pressurization, API-650 generally neglects the strength of the bottom plate and requires that the shell be anchored so that it doesn't uplift. The allowable pressures for API 12F and 12D assume that the bottom will resist some of the pressure. If the pressure is applied while the tank is completely empty, the shell will presumably lift up some distance.