Here one for the crowd

Jim@Garagecleaning

Jim@Garagecleaning

banned
There are different means of driving a pump.

1. Belt driven ( Most common and least expensive, more maintenance than the others, least efficient in transfer of HP )

2. Electrical driven ( Very efficient, though high electrical power could be an issue )

3. Hydraulic driven ( Also very efficient )

4. Engine direct drive driven ( Some love them, efficiency, not sure )

5. Gear Box


These are the basic five drives to power a pump.

All have different formula to determine the size of the motor to the pump.

Most of us know the formula for the Belt driven VS HP, But what about the rest?

What is the formulas for the other drives when determining what size of a motor is needed to drive the pump?.

So this is the senario......

I am building a unit from scratch. I have a pump that requires 20 hp belt driven. I want to get rid of my belt drive and possible change to another type of direct drive. What dose that HP need to be? How much more efficient is the other drives?
 
Mike Cooke said:
might want to edit it because there is a such thing as direct drive without gear box
Click to expand...

I always though a direct drive and a down drive gear box is the same principle since most pumps need a gear box for the correct RPMS. Very few large pumps can be a true direct drive to the back of the motor. These pumps usually always have to spin slower than the engine.

However, I took your advice and added the words gear box.

Thanks
 
most direct drive pumps are 3400 rpm and considered throw aways to the professional crowd. gear drive are just what the name implies, gear reduced down to 1450 rpm normally. I have found gear drives are easy to maintain and very sturdy. most gear drives are usually bolted onto the pump so they can't be considered pumps just a drive mechanism.
 
greg/sd said:
most direct drive pumps are 3400 rpm and considered throw aways to the professional crowd. gear drive are just what the name implies, gear reduced down to 1450 rpm normally. I have found gear drives are easy to maintain and very sturdy. most gear drives are usually bolted onto the pump so they can't be considered pumps just a drive mechanism.
Click to expand...

Thanks for the definition. Great !!!
 
Formula is the same for all pumps regardless of drive mechanism the formula for...
electric is GPM x PSI/1460= required hp
Hydraulic GPM x PSI/ 1714= required hp
Gasoline GPM x PSI/1100= required hp
Diesel GPM x PSI/ 1260= required hp
 
greg/sd said:
most direct drive pumps are 3400 rpm and considered throw aways to the professional crowd. gear drive are just what the name implies, gear reduced down to 1450 rpm normally. I have found gear drives are easy to maintain and very sturdy. most gear drives are usually bolted onto the pump so they can't be considered pumps just a drive mechanism.
Click to expand...

Ditto!!! I have thousands of hours on Gear Driven Pump's. The only problem i have ever had in all that time was a key-way failure and it messed up the shaft, which was an easy fix.;)
 
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