Giant LP450, LP350, LP400 User Manual
Triplex Ceramic
Plunger Pump
Operating Instructions/
Repair and Service
Models
Manual
LP350, LP400, LP450
Updated 3/98
Contents:
Installation Instructions: page 2
Pump Specifications: pages 3-5
Exploded View/Parts: page 6
Repair Instructions: page 7
Kits/Torque Specs.: page 7
Dimensions: back page
Warranty Information: back page
INSTALLATION INSTRUCTIONS
Installation of the Giant Industries, Inc.,
pump is not a complicated procedure, but
there are some basic steps common to all
pumps. The following information is to be
considered as a general outline for installation. If you have unique requirements,
please contact Giant Industries, Inc. or your
local distributor for assistance.
1. The pump should be installed flat on a base to
a maximum of a 15 degree angle of inclination to
ensure optimum lubrication.
2. The inlet to the pump should be sized for the
flow rate of the pump with no unnecessary
restrictions that can cause cavitation. Teflon
tape should be used to seal all joints. If pumps
are to be operated at temperatures in excess of
0
140
F, it is important to insure a positive head
to the pump to prevent cavitation.
3. The discharge plumbing from the pump
should be properly sized to the flow rate to
prevent line pressure loss to the work area. It is
essential to provide a safety bypass valve
between the pump and the work area to protect
the pump from pressure spikes in the event of a
blockage or the use of a shut-off gun.
4. Use of a dampener is necessary to minimize
pulsation at drive elements, plumbing, connections, and other system areas. The use of a
dampener with Giant Industries, Inc. pumps is
optional, although recommended by Giant
Industries, Inc. to further reduce system pulsation. Dampeners can also reduce the severity of
pressure spikes that occur in systems using a
shut-off gun. A dampener must be positioned
downstream from the unloader.
5. Crankshaft rotation on Giant Industries, Inc.
pumps should be made in the direction designated by the arrows on the pump crankcase.
Reverse rotation may be safely achieved by
following a few guidelines available upon request
from Giant Industries, Inc. Required horsepower
for system operation can be obtained from the
charts on pages 3-5.
6. Before beginning operation of your pumping
system, remember: Check that the crankcase
and seal areas have been properly lubricated per
recommended schedules. Do not run the pump
dry for extended periods of time. Cavitation will
result in severe damage. Always remember to
check that all plumbing valves are open and that
pumped media can flow freely to the inlet of the
pump.
Finally, remember that high pressure operation in a pump system has many advantages. But, if it is used
carelessly and without regard to its potential hazard, it can cause serious injury.
IMPORTANT OPERATING CONDITIONS
Failure to comply with any of these conditions invalidates the warranty.
1. Prior to initial operation, add oil to the crankcase so that oil level is between the two lines on
the oil dipstick. DO NOT OVERFILL.
2. Pump operation must not exceed rated
pressure, volume, or RPM. A pressure relief
device must be installed in the discharge of the
system.
Use SAE 90 Industrial gear oil.
3. Acids, alkalines, or abrasive fluids cannot be
Crankcase oil should be changed after the
first 50 hours of operation, then at regular
pumped unless approval in writing is obtained
before operation from Giant Industries, Inc.
intervals of 500 hours or less depending on
operating conditions.
4. Run the pump dry approximately 10 seconds
to drain the water before exposure to freezing
temperatures.
2
Specifications
6.15"
6.55"
Volume ........................................................................................................ Up to 22.6 GPM
Model LP350
Discharge Pressure .................................................................................... 2350 PSI
Inlet Pressure .............................................................................................. Up to 90 PSI
Maximum Crankshaft Speed ...................................................................... Up to 1000 RPM
Plunger Diameter ........................................................................................ 30mm
Stroke .......................................................................................................... 42mm
Crankcase Oil Capacity .............................................................................. 100 fl.oz.
Temperature of Pumped Fluids ................................................................... 140
.................................................................................................................... 160
Inlet Port ..................................................................................................... 1-1/4" BSP
Discharge Port ............................................................................................ 1" BSP
Shaft Mounting ........................................................................................... Either side
Shaft Rotation ................................................................................ Top of pulley towards manifold
Weight......................................................................................................... 105 lbs.
Crankshaft Diameter .................................................................................. 35mm
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.
o
F @1000 RPM
o
F Up to 500 RPM
HORSEPOWER INFORMATION
Horsepower ratings shown are the power requirements for the pump. Gas engine power outputs
must be approximately twice the pump power
requirements shown above.
We recommend that a 1.1 service factor be specified
when selecting an electric motor as the power source.
To compute specific pump horsepower requirements,
use the following formula:
HP = (GPM x PSI) / 1440
LP350 PULLEY SELECTION AND HORSEPOWER
REQUIREMENTS
PUMP
PULLEY
12.75" 3.95" 500 11.3 3.9 7.8 15.7 18.0
12.75" 4.95" 640 14.5 5.0 10.0 20.1 23. 1
12.75" 5.75" 750 16.9 5.9 11.8 23.5 27. 1
12.75"
12.75"
12.75" 6.95" 940 21.2 7.4 14.7 29.5 33. 9
12.75" 7.50" 1000 22.6 7.8 15.7 31.4 36. 1
MOTO R
PULLEY
RPM GPM 500 PSI 1000 PSI 2000 PSI 2300 PSI
805 18.2 6.3 12.6 25.3 29. 0
865 19.5 6.8 13.6 27.1 31. 2
3
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