Low NPSH pump
Low NPSH pump
(OP)
the project is looking to buy a steam condensate pump, the flow is 120 gpm and the head is 235 ft, (Continuous flow)
the problem is with the NPSHA < 0.5ft, I am trying to find a pump which meets this requirement. They dont want to have a Vertical canned pump
Please let me know any other vendor or pump that can meet this requirement.
I have found a Vertical in-line Roth pump (Regenerative turbine type) the NPSHR is 1 foot.
The pump will be pumping the steam condensate from existing Condensate pot (which is already below grade)
Please let me know if there is any pump other than vertical can and what is the long term consequences with less NPSH margin?
the problem is with the NPSHA < 0.5ft, I am trying to find a pump which meets this requirement. They dont want to have a Vertical canned pump
Please let me know any other vendor or pump that can meet this requirement.
I have found a Vertical in-line Roth pump (Regenerative turbine type) the NPSHR is 1 foot.
The pump will be pumping the steam condensate from existing Condensate pot (which is already below grade)
Please let me know if there is any pump other than vertical can and what is the long term consequences with less NPSH margin?





RE: Low NPSH pump
RE: Low NPSH pump
The best I can suggest is a low-speed multi-stage pump, but even then you're hard-pressed to find something that isn't a canned solution.
RE: Low NPSH pump
I too would like to know why there is such resistance to a vertical canned pump. Can anyone share information on this?
BTW, the solution to my pump problem, that is acceptable to Operations, is to use a high Nss pump, low rpm and raise the tank height by 4 ft.
RE: Low NPSH pump
When I inquired from couple of vendors the can length they gave me was 12' and 9' respectively
Earlier i forgot to mention about the steam condensate temperature, it is 360 F
I believe this temperature requires a Plan 21 or 23 arrangement.
Please let me know if there is any other thing to be taken into consideration when selecting the mechanical seal and flush plan?
RE: Low NPSH pump
Spirax manufacture such an item
http://www
http://www.spiraxsarco.com/pdfs/TI/p135_04.pdf