cir. pump

Joe Mattiello_2

The sytem pressure can not exceed the maximum prssure rating of the pump at 125 psi. system pressure, or system curve dicates net flow, and higher pressure on the discharge side unloads the motor, because no work is being done, or less work that is.

Joe Mattiello
Technical Support Technician
Tel. 401-942-8000 X 484
Fax. 401-942-2360
1160 Cranston St
Cranston, RI 02920
joemat@taco-hvac.com

JD_5

cir. pump

Does a cir. pump on a hot water boiler work harder pumping at 20 p.s.i. than at 10 p.s.i. ? Thanks.

Steamhead (in transit)

Nope

it doesn't. The standing pressure is the same on both sides when the circ is off. The circ just causes a difference in pressure which makes the water move.

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Rich Corcoran_32

Circ Pump

Steamhead is right on the mark. A higher pressure increases the NPSHA (Net Positive Suction Head Available) on a pump, which can prevent all sorts of problems(cavitation) wth larger pumps or even a small pump in a marginal aplication.

RC

Empire_2

With pump running...

increase in flo, Yes
Increase in head, Yes
Increase in Fric. loss, NO