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LP255 PULLEY SELECTION AND HORSEPOWER REQUIREMENTS
PUMP
PULLEY
MOTOR
PULLEY
RPM GPM 1000 PSI 1500 PSI 2000 PSI 2200 PSI
12.75" 3.95" 500 13 9.3 13.9 18.6 20.4
12.75" 4.35" 640 16.6 11.9 17.8 23.7 26.1
12.75" 4.95" 750 19.5 13.9 20.9 27.9 30.6
12.75" 5.35" 805 20.9 14.9 22.4 29.9 32.8
12.75" 5.75" 865 22.5 16.1 24.1 32.1 35.4
12.75" 6.15" 920 23.9 17.1 25.6 34.1 37.6
12.75" 6.50" 1000 26 18.6 27.9 37.1 40.9
4
Specifications
Model LP255
Volume............................................................................................... Up to 26.0 GPM (147.6 l/m)
Discharge Pressure ............................................................................ Up to 2200*
Inlet Pressure ..................................................................................... Up to 90 PSI
Speed ................................................................................................. Up to 1000 RPM
Plunger Diameter............................................................................... 32 mm
Stroke................................................................................................. 42 mm
Crankcase Oil Capacity ..................................................................... 116 fl.oz.
Temperature of Pumped Fluids ......................................................... Up to 160
o
F
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/LP255 ............................................................ 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!