Adding a screen to a pipe and calculating NPSH
Adding a screen to a pipe and calculating NPSH
(OP)
Hey all. We're looking to add a screen in one of our pipes and we have to figure out whether the change in pressure caused by adding the screen will starve the pump. I believe this is an NPSH problem, and I am using the equation...
NPSH = 1/g * [(Pa - Pv)/density - hf] - Z
... where g is gravity, Pa is pressure at the surface of our pond, Pv is the vapor pressure, hf is friction in fittings, and Z is the height of the pump above our pond.
The trouble I'm having is figuring out how adding the screen will change the variables in this equation.
Any and all help is greatly appreciated!
NPSH = 1/g * [(Pa - Pv)/density - hf] - Z
... where g is gravity, Pa is pressure at the surface of our pond, Pv is the vapor pressure, hf is friction in fittings, and Z is the height of the pump above our pond.
The trouble I'm having is figuring out how adding the screen will change the variables in this equation.
Any and all help is greatly appreciated!





RE: Adding a screen to a pipe and calculating NPSH
RE: Adding a screen to a pipe and calculating NPSH
Katmar Software - Engineering & Risk Analysis Software
http://katmarsoftware.com
"An undefined problem has an infinite number of solutions"
RE: Adding a screen to a pipe and calculating NPSH
In the link below you'll find a free calculator which could help you to calculate what you're looking for.
http://www.pressure-drop.mobi/
RE: Adding a screen to a pipe and calculating NPSH
RE: Adding a screen to a pipe and calculating NPSH
rmw
PS: The thought occurred to me to start a thread to get the members to list what they have seen caught by strainers and/or screens. I didn't use my whole list above.
RE: Adding a screen to a pipe and calculating NPSH
RE: Adding a screen to a pipe and calculating NPSH
I agree that minor loss is an unfortunate use of words to describe something which could become not trivial at all in computing head loss. Anyway that's the way it is: I've not coined the term myself
RE: Adding a screen to a pipe and calculating NPSH
RE: Adding a screen to a pipe and calculating NPSH