Makeup pump for tower.
Makeup pump for tower.
(OP)
Dear all,
Please help me to understand about the makeup pump design.
Open head of chilled water pump as follows:-
Discharge- 700kpa
Suction -420kpa
Head of pump - 292 kpa
What pressure I can set the makeup pump for cut off.
Whether delta of discharge or suction or suction pressure.
Please help me to solve this .
Regards
Sandy
Please help me to understand about the makeup pump design.
Open head of chilled water pump as follows:-
Discharge- 700kpa
Suction -420kpa
Head of pump - 292 kpa
What pressure I can set the makeup pump for cut off.
Whether delta of discharge or suction or suction pressure.
Please help me to solve this .
Regards
Sandy





RE: Makeup pump for tower.
Where in the system does the make-up pump connect? The pump must generate enough pressure to push water into the system at the location of connection - you need to figure out what the pressure is at this location.
If the make-up is connected immediately before the pump, it needs a set point of 420 kPa.
If the make-up is connected immediately after the pump, it needs a set point of 700 kPa.
Any other point will require a set point somewhere in-between.
I've always found it best to provide make-up at the point of system pressure/expansion control (the expansion tank). This is the point where the system pressure is set, therefore it is the one point you "know" precisely. You can get combined expansion tank/pressurization/make-up units which make all this very simple.
Note, one of your readings is wrong*, head of pump = discharge - suction (700-420 = 280)
* unless your suction and discharge points are measured before/after other components (strainers, valves etc)
hope this helps.
RE: Makeup pump for tower.
if open there will be no expansion tank obviously.
all other comments still stand
RE: Makeup pump for tower.