Viscosity
Viscosity
(OP)
What is the practical / maximum viscosity limit for centrifugal pumps ?
Please advise.
Thanks
Please advise.
Thanks
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RE: Viscosity
ANSI / HI 1.1-1.5-1994
American National Standard for Centrifugal Pumps
for Nomenclature, Definitions, Application and Operation
suggests that you can apply correction factors for performance with viscosities up to 2200 cSt for small pumps (Q<=100 USGPM @ BEP) and about 4000 cSt for larger pumps. One might infer that these represent industry-accepted practical limitations.
Also, I think I read somewhere that the affinity laws for centrifugal pumps start breaking down when viscosities exceed 50 cP. Might have been in the Hydraulic Institute Standards.
Regards,
SNORGY.
RE: Viscosity
Sulzer in its Centrifugal Pump Handbook (Elsevier) says:
BTW, 1 cSt = 10-6 m2/s.
RE: Viscosity
You might also want to consult ANSI/HI 9.6.7 ("Effects of Liquid Viscosity on Rotodynamic Pump Performance"), which presents a revised procedure and equations to predict pumps performance or give a shot to this handy calculator:
h
RE: Viscosity
"I am sure it can be done. I've seen it on the internet." BigInch's favorite client.
http://www.youtube.com/watch?v=hpiIWMWWVco
"Being GREEN isn't easy." Kermit
http://virtualpipeline.spaces.live.com
RE: Viscosity
I am old. I stopped collecting stuff years ago when it started to hurt too much to bend over to pick things up.
That said, I should (and will) endeavour to get a copy of the more recent publication. Thanks for letting me know.
Regards,
SNORGY.
RE: Viscosity
RE: Viscosity
If you find a large print version, post back.
rmw
RE: Viscosity
rmw, It'll probably be in "mimiograph media".
"I am sure it can be done. I've seen it on the internet." BigInch's favorite client.
http://www.youtube.com/watch?v=hpiIWMWWVco
"Being GREEN isn't easy." Kermit
http://virtualpipeline.spaces.live.com
RE: Viscosity
I know I read "50 cP" as a magic number somewhere. I'll have to dig around a bit. HIS FAQ's suggests 1000 SSU, closer to 200 cP.
rmw:
http://estore.pumps.org/Centrifugal-Pumps-C7.aspx
Regards,
SNORGY.
RE: Viscosity
http://w
RE: Viscosity
The original question could be a little misleading. I would be hesitant to answer unless I knew the head and flow required. Do you have a small pump that only requires 10 GPM with 10 feet of head or are you trying crude oil pipeline pumps?
Knowing a little more about the application would help. Economics ultimately should determine the answer.
D23