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API 650 design uplift pressure on the roof

API 650 design uplift pressure on the roof

API 650 design uplift pressure on the roof

Hello, I'm trying to do some calculations on Wind overturning stability on a self supported cone roof tank with internal pressure. The thing is that when I look at the design code in the point 5.2.1(k)2 it states the maximum design pressure on roof. My struggle is to understand the meaning of this. Say I have some wind speed that results into an uplift pressure on roof per 5.2.1(k)1 .And internal pressure such that it exceeds the 1.6 times the design pressure P per F 4.1, does it mean that I need to reduce the allowable internal pressure in tank so I dont exceed the max design pressure on roof cap? .If this point states that I need to take into account only 1.6 P per F 4.1 if the sum of design and internal pressure exceeds that value, how can I make the wind overturning stability check since it's made with load combination cases?

RE: API 650 design uplift pressure on the roof

I think in most cases, for a self-supporting roof, the allowable pressure per F4.1 is going to be higher than any wind pressure.

I think the point of the section being referenced is that if the roof is going to peel off the tank in a hurricane, then you can't develop the same amount of uplift as you could if it stayed on.

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