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API 650 App P shell thickness w/repad

API 650 App P shell thickness w/repad

API 650 App P shell thickness w/repad

(OP)
I am working through the nozzle calculations per App P.2. The tank includes a repad (1/4", same as shell).

My question is does 't' (shell thickness) include this repad ie. 1/2"?

I can see it not being included for somthing like radial deflection or shell rotation, since the repad is only a small part of the tank shell. But if it isn't included at all, I dont see where having a repad or not benefits the calculation, ie. shouldn't the calculation with a repad produce higher allowable loads?

Thanks.
Daryl

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