Barry Kirk
New member
Can a general pump (TSF-2021) 8.5@3600 be reduced to say 6 GPM by changing pullies or some other means? This pump is set up with a 25 HP Kohler.
decrease GPM?
- Thread starter Barry Kirk
- Start date
Dave Olson
Workin North of 60
Russ Johnson
Equipment Expert
Barry, if you want to permanently pump 6 gpm, you can resize the pulleys and turn the pump slower. At 1250 RMP, the TSF2021 will make 6 gpm. Use this formula to figure your pulley needs. Engine speed X engine pulley diameter = Pump speed X pump pulley diameter. So....ES = 3400, EP = 3.5", PS = 1250. 3400 X 3.5 = 1250 X ?, 11,900 = 1250 X ?, 11900 / 1250 = ?, 9.52 = ?. Get it?
Barry Kirk
New member
Thanks for your help guys! I think I get it and will keep the formulas and tip info onfile for future reference.
Henry Bockman
Maryland Pressure Washing
I can't answer this question for you but why would you want to cut down your water volume? More gpm gives you better cleaning. With the 8 or 10gpm pumps your both talking about I would rig them for two gun operation. That would cut down your water volume and also allow you to have two people working off the same rig. That's how my 8gpm pump is set up at least. I can use one gun or two if I like.
Dave Olson
Workin North of 60
Hello Henry,
Yes we do run 2 wands on many of our projects.
Dave Olson
Yes we do run 2 wands on many of our projects.
Dave Olson
Henry Bockman
Maryland Pressure Washing
That makes sense with a pump the size you have. Why would someone want to cut down their water volume though?
Hey Dave, how much horsepower are you running for that 10gpm pump and how much do they cost?
I wouldnt mind bumping up my water volume a bit either if I could get away with it. I've got a 25hp kohler engine on my rig with a 200 gallon tank and I usually get enough water from the houses in this area to fill the tank up when running 8gpm.
How big a pump could I run with an engine this size, hooked up to adequate incoming water with a 200 gallon tank?
Hey Dave, how much horsepower are you running for that 10gpm pump and how much do they cost?
I wouldnt mind bumping up my water volume a bit either if I could get away with it. I've got a 25hp kohler engine on my rig with a 200 gallon tank and I usually get enough water from the houses in this area to fill the tank up when running 8gpm.
How big a pump could I run with an engine this size, hooked up to adequate incoming water with a 200 gallon tank?
Dave Olson
Workin North of 60
Hello Henry,
We have a 20 horse 220 3 phase electric motor running this pump.
Here is a chart to determine what horsepower you need based on type of motor. I did a copy paste from Generl Pumps web site.
Q. How do I calculate the horsepower required for my system?
A. The horsepower required for operation is based on three variables: discharge volume, pressure and drive type. The formula for the calculation is H=(P*G)/C.
Where: H = Horsepower
P = Pressure in PSI
G = Flow in GPM
C = Drive constant:
Hydraulic C = 1714
Electric C = 1460
Gasoline C = 1250 (Industrial grade)
Gasoline C = 1100 (Standard grade)
Diesel C = Supplied by Engine Mfr.
This will give you an estimate of the horsepower required for the system. To specifically determine required horsepower, motor and drive efficiencies must be considered. Contact your motor supplier for these values.
Dave Olson
We have a 20 horse 220 3 phase electric motor running this pump.
Here is a chart to determine what horsepower you need based on type of motor. I did a copy paste from Generl Pumps web site.
Q. How do I calculate the horsepower required for my system?
A. The horsepower required for operation is based on three variables: discharge volume, pressure and drive type. The formula for the calculation is H=(P*G)/C.
Where: H = Horsepower
P = Pressure in PSI
G = Flow in GPM
C = Drive constant:
Hydraulic C = 1714
Electric C = 1460
Gasoline C = 1250 (Industrial grade)
Gasoline C = 1100 (Standard grade)
Diesel C = Supplied by Engine Mfr.
This will give you an estimate of the horsepower required for the system. To specifically determine required horsepower, motor and drive efficiencies must be considered. Contact your motor supplier for these values.
Dave Olson