Pump Selection for Lift Station
Pump Selection for Lift Station
(OP)
I'm a new engineer who is just getting into designs.
I have to design a lift station to handle 0.127cu m/s of flow. I've calculated the horsepower requirement for the pump(s) but folks at the office think i shouldn't have. They say all i need to give the manufacturer is the flow and TDH.
Is this standard engineering practice? The HP rating is 100. I'm thinking about 2-50HP pumps and 2 more for standby. I was thinking that during low flow, one pump could be used...possibly. Also, more pumps would give the system more robustness.... minimising the risk of the station being out of operation. (Note: This LS serves a large area). The office folks say 1-100HP and another standby. Please tell me what you think, i don't want to fall into lax engineering practices.
One more thing...the equation: Water HP = Q x TDH/3960, would it work for sewage pumps?
Looking forward to your responses,
Allie
I have to design a lift station to handle 0.127cu m/s of flow. I've calculated the horsepower requirement for the pump(s) but folks at the office think i shouldn't have. They say all i need to give the manufacturer is the flow and TDH.
Is this standard engineering practice? The HP rating is 100. I'm thinking about 2-50HP pumps and 2 more for standby. I was thinking that during low flow, one pump could be used...possibly. Also, more pumps would give the system more robustness.... minimising the risk of the station being out of operation. (Note: This LS serves a large area). The office folks say 1-100HP and another standby. Please tell me what you think, i don't want to fall into lax engineering practices.
One more thing...the equation: Water HP = Q x TDH/3960, would it work for sewage pumps?
Looking forward to your responses,
Allie





RE: Pump Selection for Lift Station
Process - Piping
RE: Pump Selection for Lift Station
If very low flows are expected 1 unit could even be put on VFD drive - plus 3 units can also cover for any exceptional high inflows should this ever occur.
Your HP calculation should be Q x TDH / 3960 / pump Eff.
And yes, the HP calc. is of use for a couple or reasons - 1 as pointed out by Pipeline1972 and secondly it gives you a fell for what size equipment you are looking at.
RE: Pump Selection for Lift Station
"If everything seems under control, you're just not moving fast enough."
- Mario Andretti- When asked about transient hydraulics
http://virtualpipeline.spaces.msn.com
RE: Pump Selection for Lift Station
Thanks again,
Allie
RE: Pump Selection for Lift Station
"If everything seems under control, you're just not moving fast enough."
- Mario Andretti- When asked about transient hydraulics
http://virtualpipeline.spaces.msn.com
RE: Pump Selection for Lift Station
If you use their software then you can select the pump that best suits your system and all its scenarios.
RE: Pump Selection for Lift Station
Omigosh...Thanks a million! I didn't get flyps but in my search, i stumbled upon PUMP-FLO.com and this site is amazing...it has got a pump selector for every manufacturer i've ever heard of and many, many more.
So, once again, thanks for the heads-up on the free software availability.
Regards,
Allie
RE: Pump Selection for Lift Station
How about posting the link to PUMP-FLO
RE: Pump Selection for Lift Station
"If everything seems under control, you're just not moving fast enough."
- Mario Andretti- When asked about transient hydraulics
http://virtualpipeline.spaces.msn.com
RE: Pump Selection for Lift Station
RE: Pump Selection for Lift Station
Just in case you still want the link, it's attached.