3
U.S. ......................... (Metric)
Volume.......................................................... 20.6 GPM .............. 78.0 LPM
Discharge Pressure ......................................4060 PSI ................. 280 bar
Power Required ............................................56.0 BHP ................. 41.8 kW
Speed (Continuous)...................................... ................................ 1000 RPM
Inlet Pressure (maximum) ............................
-4.35 to145 PSI
......
-0.3 to 10 bar
Plunger Diameter..........................................
1.1”
.......................... 28 mm
Crankshft Stroke ...........................................
1.81”
........................ 46 mm
Crankshaft Diameter.....................................
1.38”
........................
35 mm
Crankshaft Mounting ..................................................................... Either side
Shaft Rotation ................................................................................ Top of pulley towards manifold
Temperature of Pumped Fluids ....................Up to 140
o
F ............. (60
o
C)
Inlet Ports ......................................................................................
(3) 1-1/2” NPT
Discharge Ports .............................................................................
(2) 1” NPT
Weight ..........................................................179 lbs. ................... (81 kg)
Crankcase Oil Capacity ................................1.2 Gal. ................... (4.6 liter)
Fluid End Material......................................... ................................ Nickel-Plated Spheroidical Cast Iron
Specifications
Model GP5128GB Series
Consult the factory for special requirements that must be met if the pump is to
operate beyond one or more of the limits specified above.
Horsepower Ratings:
We recommend a 1.15 service factor be specified when selecting an electric motor as the power
source.
To compute electric motor horsepower required, use the following formula: HP = (GPM X PSI) /
1450.
The formula to determine the horsepower required for a gas engine is: HP = (GPM X PSI) / 1150.
The formula to determine the horsepower required for a diesel engine is: HP = (GPM X PSI) / 1250.
For the Application of a Hydraulic Motor:
To Determine the Torque of a Hydraulic Motor -- (GPM x PSI x 36.77) / RPM = Torque (in-lbs)
Calculating RPM / GPM of Pump:
A pump must be connected to an electric motor or gas or diesel engine with the correct ratio of pulleys
and belts to attain the required speed and GPM. The use of a Variable Frequency Drive (VFD) may
also
be used to control the RPM of a properly sized electric motor when variable flows are required.
(Max. Pump RPM / Rated Pump GPM) x Required Pump GPM =
Required Pump RPM
To calculate a pulley diameter one (1) pulley diameter and the required pump RPM must be known:
(Pump RPM x Pump Pulley Diameter) / Motor RPM = Motor Pulley Diameter
(Motor RPM x Motor Pulley Diameter) / Pump RPM = Pump Pulley Diameter
