Calculating Static Pressure gain in expansion

[oaskar]

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!

 

[BigInch]

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.

BigInch-born in the trenches.

http://virtualpipeline.spaces.msn.com