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LP122A SERIES/LP123 PULLEY SELECTION AND HORSEPOWER
REQUIREMENTS
GPM
PUMP
PULLEY
MOTOR
PULLEY
RPM 600 PSI 800 PSI 1000 PSI 1300 PSI 2000 PSI*
22.3 12.75" 3.95" 500 9.6 12.7 15.9 20.7 31.9
24.7 12.75" 4.35" 555 10.6 14.1 17.6 22.9 35.3
28.5 12.75" 4.95" 640 12.2 16.3 20.4 26.5 40.7
30.9 12.75" 5.35" 695 13.2 17.7 22.1 28.7 44.1
33.4 12.75" 5.75" 750 14.3 19.1 23.9 31.0 47.7
35.6 12.75" 6.15" 800 15.3 20.3 25.4 33.1 50.9
39.4 12.75" 6.50" 885 16.9 22.5 28.1 36.6 56.3
3
Specifications
Models LP122A Series/LP123
Pump speeds of 640 RPM and above require a minimum inlet pressure of 12 psig.
Pump speeds of 805 RPM and above require a minimum inlet pressure of 14 psig.
Volume............................................................................................... Up to 39.0 GPM (147.6 l/m)
Discharge Pressure ............................................................................ Up to 2000* PSI (138* Bar)
Inlet Pressure ..................................................................................... Up to 90 PSI (6.2 Bar)
Speed ................................................................................................. Up to 885 RPM
Plunger Diameter............................................................................... 42 mm
Stroke................................................................................................. 42 mm
Crankcase Oil Capacity ..................................................................... 116 fl.oz.
Temperature of Pumped Fluids ......................................................... Up to 160
o
F (71
o
C)
Inlet Port ............................................................................................ 1-1/2" NPT
Discharge Port ................................................................................... 1" NPT
Crankshaft Mounting......................................................................... Either Side
Shaft Rotation.................................................................................... Top of Pulley Towards Fluid End
Weight................................................................................................ 116 lbs.
Crankshaft Diameter.......................................................................... 35 mm
Valve Casing - LP122A ..................................................................... Aluminum Bronze
Valve Casing - LP123 ........................................................................ Brass
Valve Casing - LP122A-4000............................................................ 303 S.S.
Valve Casing - LP122A-3100............................................................ Aluminum Bronze-Nickle
Volumetric Efficiency @ 800 RPM................................................... 0.96
Mechanical Efficiency @ 800 RPM.................................................. 0.85
PULLEY INFORMATION
Pulley selection and pump speed are based on a 1725
RPM motor and "B" section belts. When selecting
desired GPM, allow for a ±5% tolerance on pumps
output due to variations in pulleys, belts and motors
among manufacturers.
1. Select GPM required, then select appropriate
motor and pump pulley from the same line.
2. The desired pressure is achieved by selecting the
correct nozzle size that corresponds with the pump
GPM.
HORSEPOWER INFORMATION
We recommend that a 1.1 service factor be specified
when s electing an electric motor as the power source.
To compute specific pump horsepower requirements,
use the following formula:
HP = (GPM X PSI) / 1440
*Intermittent duty only! - Consult factory!
*