Domestic Water Pump Torque Curves
Domestic Water Pump Torque Curves
(OP)
Hello:
I am an electrical engineer trying to convince the folks in my group that when replacing a 1940s vintage 50hp pump motor with a modern energy efficient replacement, a lot more has to be done than just supplying the nameplate data. I think that proper engineering practice would dictate obtaining the motor and pump curves (available)and based on the system configuration match a motor with the existing pump.
The folks in my group (non engineers) say that all that is necessary is the name plate data of the original motor and nothing more. They say I am "over-engineering" a simple installation.
What do you folks think?
Jimmy Junior, PE
Senior Electrical Engineer
I am an electrical engineer trying to convince the folks in my group that when replacing a 1940s vintage 50hp pump motor with a modern energy efficient replacement, a lot more has to be done than just supplying the nameplate data. I think that proper engineering practice would dictate obtaining the motor and pump curves (available)and based on the system configuration match a motor with the existing pump.
The folks in my group (non engineers) say that all that is necessary is the name plate data of the original motor and nothing more. They say I am "over-engineering" a simple installation.
What do you folks think?
Jimmy Junior, PE
Senior Electrical Engineer





RE: Domestic Water Pump Torque Curves
If the guy who signs your paycheck thinks you're over- engineering, then you are. No one else's opinion is relevant.
Mike Halloran
Pembroke Pines, FL, USA
RE: Domestic Water Pump Torque Curves
RE: Domestic Water Pump Torque Curves
I only need motor torque curves for start-up analysis for high static head lifts. Since most electric motors seem to deliver about 150% torque when starting, its seldom a critical concern.
A pump should always be matched with its system curve (and control valves) and IMO its always a good thing to check when renovating an old system, since its common for flowrates to change over the years. Listen to Mike's advice above, but check it anyway. Its a quick job and most of the time...nobody else needs to know.
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