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Calculating Static Pressure gain in expansion

Calculating Static Pressure gain in expansion

Calculating Static Pressure gain in expansion

(OP)
In doing the pressure drop calculations based on the expansion of the 8"D to a 10"D and also eliminating the 45 degree elbows, do i need to calculate the SP gain in expansion(if so is the Static Regain factor = old cross sectional area/new?) or is it unnecessary if I just know how much velocity(in fpm) I lost from the expansion?

Also after calculating the total pressure drop in the system, what other criteria do i look at to determine the efficiency of the system i designed??
Thank you!

RE: Calculating Static Pressure gain in expansion

That's not static pressure.

And its a net pressure loss that occurs at a reducer or an "expander", due to turbulence generated in the expansion process.

BigInchworm-born in the trenches.
http://virtualpipeline.spaces.msn.com

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