Max RPM for Centrifugal Pump
Max RPM for Centrifugal Pump
(OP)
Is there a maximum RPM for a centrifugal pump? I was just quoted a centrifugal sea water pump operating at 6756 RPM. Wont it wear out quickly at this speed? Pump material is 2205 duplex stainless.





RE: Max RPM for Centrifugal Pump
High rotation usually means problems with impller and casing erosion yes, but also with NPSH and cavitation. You can meet a high speed with the right motor, but just because it "can" run that fast doesn't mean that it "should be" running that fast. Do you really want to turn it that fast? Usually is cheaper to go slower.
RE: Max RPM for Centrifugal Pump
RE: Max RPM for Centrifugal Pump
RE: Max RPM for Centrifugal Pump
RE: Max RPM for Centrifugal Pump
Just because the vendor wants to sell you this, doesn't mean it's a good idea.
It's attractive because high speed means smaller and cheaper.
One way or another you will pay now or later.
No free lunch as they say.
To level the playing field, make sure the warranty is for parts, labor and ... lost production.
I hate Windowz 8!!!!
RE: Max RPM for Centrifugal Pump
Can't believe your duplex stainless pump with a gearbox is much cheaper than a traditional 3600rpm centrifugal; or will have less reliability/Maintenance issues. You could look at a two stage offering from most any of the big players.
RE: Max RPM for Centrifugal Pump
How about posting make, model, curve etc. for us all to see.
It is a capital mistake to theorise before one has data. Insensibly one begins to twist facts to suit theories, instead of theories to suit facts. (Sherlock Holmes - A Scandal in Bohemia.)
RE: Max RPM for Centrifugal Pump
RE: Max RPM for Centrifugal Pump
Don't see any problem with the selection - one can only assume the vendor knows that he is specifying / supplying.
Wear out in what way? erosion of the wetted parts, bearings / seals, gearbox ??
It is a capital mistake to theorise before one has data. Insensibly one begins to twist facts to suit theories, instead of theories to suit facts. (Sherlock Holmes - A Scandal in Bohemia.)
RE: Max RPM for Centrifugal Pump
As long as "cavet emptor" is equally in force.
I hate Windowz 8!!!!
RE: Max RPM for Centrifugal Pump
The only other options I can think of that could perform the Conditions of Service would be:
- typical 2-stage centrifugal splitcase run at 3600rpm. Many make them; seawater materials (NiAlBrz, CD4MCu, Duplex, etc) could make this cost prohibitive.
- vertical turbine style pump laid horizontally. This might take too many stages and could be very expensive if you had more than 410 series stainless fitted. However, you could possibly get away with 1800 rpm selection with a large diameter impeller; think lifetime costs.
WOuld like to see a $$ comparison of up front costs between these styles.
RE: Max RPM for Centrifugal Pump
Regards
StoneCold