Giant GP7145 User Manual

Models
GP7145 and GP7255A

Triplex Ceramic

Plunger Pump

Operation Manual

Updated 11/07

Contents:

Installation Instructions page 2
Pump Specifications (GP7145): page 3
Exploded View: page 4
Parts List: page 5
Pump Specifications (GP7255A): page 6
Kits/Torque Specifications: page 7
Maintenance Information: page 7
Repair Instructions: page 8
Troubleshooting Guide: page 9
Dimensions: page 10
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 140
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

o

F, it is important to

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
charts on pages 3 and 6.

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.

operation can be obtained from the

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 crankcase so
that oil level is between the two lines on the oil
dipstick. DO NOT OVERFILL.

Use Giant Recommended Oil (p/n 01154), or the
equivalent to SAE 85-90W Industrial Grear Lube.

Crankcase oil should be changed after the first 50
hours of operation, then at regular intervals of 500
hours or less depending on operating conditions.

2. Pump operation must not exceed rated
pressure, volume, or RPM.
device must be installed in the discharge of the
system.

3. Acids, alkalines, or abrasive fluids cannot be
pumped unless approval in writing is obtained
before operation from Giant Industries, Inc.

4. Run the pump dry approximately 10 seconds
to drain the water before exposure to freezing
temperatures.

A pressure relief

NOTE: Contact Giant Industries for Service School Information. Phone: [phone].

2

Specifications

Model GP7145

U.S................................(Metric)

V olume (Continuous)............................................................... 47.5 GPM .....................(180 LPM)

Volume (Intermittent).............................................................. 60 GPM* ......................(227 LPM)*

Discharge Pressure ................................................................ 3000 PSI .......................(207 bar)*

Speed (Continuous).........................................................................................................750 RPM

Speed (Intermittent) ........................................................................................................947 RPM

Inlet Pressure (maximum) ...................................................... 145 PSI .........................(10 bar)

Plunger Diameter.................................................................... 1.77” .............................45mm

Plunger Stroke ........................................................................ 2.0” ...............................52mm

Crankshaft Diameter .............................................................. 1.9” ............................... 48mm

Key Width............................................................................... 0.6” ...............................14mm

Crankshaft Mounting ......................................................................................................Either side

Shaft Rotation ......................................................................... Top of pulley towards manifold

T emperature of Pumped Fluids............................................... Up to 140

Inlet Ports .......................................................................................................................(2) 2-1/2" NPT

Discharge Ports .............................................................................................................. (2) 1-1/4" NPT

Weight ..................................................................................... 455 lbs...........................(206 kg)

Crankcase Oil Capacity .......................................................... 1.6 Gal. .........................(6.0 liter)

Fluid End Material...........................................................................................................Spheroidical Cast Iron

o

F .................(60 oC)

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.

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.

GP7145 PULLEY SELECTION & HORSEPOWER

REQUIREMENTS

RPM GPM 800 PSI 1000 PSI 1500 PSI 2000 PSI 3000 PSI*

300 19.0 10.9 13.6 20.4 27.1 40.7
400 25.3 14.5 18.1 27.1 36.2 54.3
500 31.7 18.1 22.6 33.9 45.2 67.9
600 38.0 21.7 27.1 40.7 54.3 81.4
750 47.5 27.1 33.9 50.9 67.9 101.8
789 50.0 28.6 35.7 53.5 71.4 107.1
947 60.0 34.3 42.9 64.3 85.7 128.6

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:

(GPH X PSI) / 1450 = HP

* Intermittent Duty Only!

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Exploded View - GP7145 and GP7255A

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