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Wetted surface for torispherical head

Wetted surface for torispherical head

Wetted surface for torispherical head

(OP)
I want to size a safety valve for a vertical cylindrical styrene storage tank with torispherical heads. According to API-521, for fire case, Q=21000*F*(Wetted Area)^0.82. How to determine wetted area for the head. Can anybody please help?

RE: Wetted surface for torispherical head

try 0.918 D^2.  i found this in some notes but cannot find a source for it.   since it is more than pi/4 D^2, it may be close.

RE: Wetted surface for torispherical head

Can't you get it from the blank diameter of the plate before forming?

RE: Wetted surface for torispherical head

(OP)
Thank you Ben for your reply.
Could you tell me, what will be the wetted surface area of torispherical heads of a partially filled bullet?

Thanks in advance.

RE: Wetted surface for torispherical head

quark:

you can't, since the plate is distorded during forming. Final area is greater than the plate area.

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