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pressure drop through a reducer

pressure drop through a reducer

pressure drop through a reducer

(OP)
would like to know how to compute the pressure drop through a reducer from 20 inches to 12 inches if the inlet of the reducer has 195 centrigrade 77t/hr of crude oil column overhead  vapour  

RE: pressure drop through a reducer

There is very little published data for standard pipe reducers. Hooper (Chem Eng, Nov 7, 1988, pg 89-92) says reducers give very little resistance when flowing from large to small, but are effectively sudden expansions when flowing from small to large.

In the reduction mode Hooper's equation is
K = (0.1 + 50/Re)( (D/d)^4 - 1 )

where
  Re is based on inlet (large) diameter
  D is inlet (large) diameter
  d is small (outlet) diameter

A conical tapered reducer would give a higher K value than this.

Katmar Software
Engineering & Risk Analysis Software
http://katmarsoftware.com

RE: pressure drop through a reducer

Crane has a method.  I cannot comment on its accuracy.

RE: pressure drop through a reducer

(OP)
thanks guys,
for now let me use Katmars formula but generally speeking it seems its its difficult to calculate

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