Giant GP7128 User Manual
Model
GP7128
Triplex Ceramic
Plunger Pump
Operating Instructions/
Repair and Service Manual
Contents:
Installation Instructions: page 2
Pump Specifications: page 3
Exploded View: page 4
Parts List/Kits page 5
Repair and Service: pages 6-8
Torque Specs: page 8
Trouble Shooting Chart: page 9
Recommended Spare
Parts List: page 10
Dimensions: page 11
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 1400 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
chart on page 3.
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 crankcase so
that the oil level is between the two lines on the oil
dipstick. DO NOT OVERFILL. SAE 80 Indus-
trial Gear oil may be used. Crankcase oil should
be changed after the first 50 hours of operation,
then at regular intervals of 200 hours or less depending on operating conditions.
2. Pump operation must not exceed rated
pressure, volume, or RPM. A pressure relief
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.
2
Specifications
Model GP7128
Flow .....................................................................17.9 GPM..................... 67.7 Liters/minute
Discharge Pressure ............................................. 5800 PSI
1
......................................
400 Bar
1
Crankshaft Speed ....................................................................................... 750 RPM
Inlet Pressure (maximum) ...................................-4.35 to 145 PSI ........... -0.3 to 10 Bar
Plunger Diameter.................................................1.1” ............................... 28 mm
Plunger Stroke .....................................................2.1”............................... 52 mm
Crankshaft Diameter ........................................... 1.9” ............................... 48 mm
Key Width............................................................0.6” ............................... 14 mm
Crankshaft Mounting .................................................................................. Either side
Shaft Rotation ................................................................................T op of pulley towards manifold
o
T emperature of Pumped Fluids............................140
F ...........................60 oC
Inlet Ports ...................................................................................................(2) 1-1/4" BSP
Discharge Ports .......................................................................................... (2) 3/4" BSP
Weight ..................................................................375 lbs. ......................... 170 Kg
Crankcase Oil Capacity .......................................1.6 Gal. .........................6 Liters
Fluid End Material....................................................................................... Stainless Steel
Volumetric Efficiency @ 700 RPM............................................................ 89%
Mechanical Efficiency @ 700 RPM .......................................................... 83%
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.
NOTES:1This specification for maximum pressure and maximum speed apply to
intermittent duty. When the pump is used for continuous duty and/or with
water warmer than 100oF, these values must be reduced by 10%.
GP7128 HORSEPOWER REQUIREMENTS
RPM GPM 3000 PSI 4000 PSI 5000 PSI 5800 PSI
300 7.2 15.4 20.6 25.7 29.8
400 9.5 20.4 27.1 33.9 39.4
550 13.1 28.1 37.4 46.8 54.3
600 14.3 30.6 40.9 51.1 59.2
650 15.5 33.2 44.3 55.4 64.2
700 16.7 35.8 47.7 59.6 69.2
750 17.9 38.4 51.1 63.9 74.2
HORSEPOWER RATINGS:
The rating shown are the power requirements for the
pump. Gas engine power outputs must be
approximately twice the pump power requirements
shown above.
We recommend a 1.1 service factor be specified
when selecting an electric motor as the power
source.
T o compute specific pump horsepower requirements,
use the following formula:
GPM X PSI
1400
3
= hp
Exploded View - GP7128 Pump
4
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