Dear Friends,
API Std 521, mentinoed number of Vapor Passes (N) to calculate vapor velocity, as follows
Uv = (260/N)* (1/Av)
where
N = Number of Vapor Passes
Av = Segmental area for vapor in meter2.
Please any one will define the term "N", number of vapor passes, what does it mean.
Thanks
Nasiruddin



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