Triplex Ceramic
Plunger Pump
Operating Instructions /
Models
GP5120, GP5122 & GP5124
Manual
updated 01/17
Contents:
Installation Instructions: page 2
Pump Specications: page 3
Exploded View: page 4
Parts List: page 5
Kits/Torque Specs: page 6
Repair Instructions: page 7
Dimensions: back page
Warranty Information back page
INSTALLATION INSTRUCTIONS
Operation and Maintenance
Check oil level prior to starting and ensure
trouble-free water supply.
Important! If there is a danger of frost, the water in the pump and in the pump ttings (particularly the unloader valve) must be emptied. The
second discharge port can also be used and the
pump run “dry” for 1-2 minutes for this purpose.
Oil: Use only 1.2 gal. (4.6 L) SAE 80W-90 Industrial Gear Lube Oil.
Before putting the pump into operation for
the rst time, and every time the suction line
is emptied, the plugs (37) must be removed
and the pump cranked manually or started
briey until water emerges out of the plug
bores. This procedure serves to vent the
drip-return so that the low-pressure seals
(32) do not run dry.
Thereafter the plugs (34) must be screwed back
on and tightened.
Initial oil changed after 50 operating hourse and
then every 1000 operating hours, or after 1 year
if used less.
Caution when operating in damp places or with
high temperature uctuations. Oil must be
changed immediately should condensate (frothy
oil) occur in the gear box.
NPSH values must be respected.
Max. input pressure 145 PSI (10 bar), max.
suction head -4.35 PSI (-0.3) bar. Make sure
that suction pulsation is sufciently dampened -
water column resonance must be avoided.
Safety Rules
A safety valve is to be installed in accordance
with the guidelines for liquid spraying units so
that the admissible operating pressure cannot
be exceeded by more than 10%.
Pump operation without a safety valve as well
as any excess in temperature or speed limits
automatically voids the warranty.
When the pump is in operation, the shaft end
must be covered by shaft protector (21) and the
driven shaft side and coupling by a protective
cover.
Pressure in the discharge line and in the pump
must be at zero before any maintenance to the
pump takes place. Close off suction line.
Take necessary precautions to ensure that the
driving motor cannot get switched on accidently
(by disconnecting the fuses, for example).
Make sure that the pump and all parts on the
pressure side of the unit are vented and relled,
with pressure at zero, before starting the pump.
In order to prevent air, or an air/water mixture
being absorbed and to prevent cavitation oc-
curring, the pump positive suction head (npshr)
and water temperature must be respected.
Cavitation and/or compression of gases lead
to uncontrollable pressure spikes which can
ruin pump and unit parts and also be dan-
gerous to the operator and anyone standing
nearby.
Giant plunger pumps are suitable for pump-
ing clean water and other non-aggressive or
abrasive media with a specic weight similar to water. Before pumping other liquids
- especially ammable, explosive and toxic
media - Giant must be consulted with regard
to the resistance of the pump material. It is
the reposnsibility of the equimpment manufacturer and/or operator to ensure that all
pertinent safety regualtions are adhered to.
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GP5120/GP5122/GP5124 SERIES PUMP SPECIFICATIONS
Max.
Flow
Max.
Pressure
Max.
Speed
Power
Req’d.
Max.
Temp.
Plunger
Diameter
NPSH
Required
Model GPM PSI RPM HP °F in Ft-Head
GP5120 10.5 8700 1000 63.3 140 0.787 27.9
GP5122 11.9 7250 930 59.0 140 0.866 27.9
GP5124 13.2 5800 850 53.8 140 0.945 27.9
Max.
Flow
Max.
Pressure
Max.
Speed
Power
Req’d.
Max.
Temp.
Plunger
Diameter
NPSH
Required
Model L/min Bar RPM kW °C mm mWs
GP5120 40.0 600 1000 47.2 60 20 8.5
GP5122 45.0 500 930 44.0 60 22 8.5
GP5124 50.0 400 850 40.1 60 24 8.5
Horsepower Ratings:
We recommend a 1.15 service factor be specied when selecting an electric motor as the power source.
To compute electric motor horsepower required, use the following formula: HP = (GPM X PSI) / 1450.
The formula to determine the horsepower required for a gas engine is: HP = (GPM X PSI) / 1150.
The formula to determine the horsepower required for a diesel engine is: HP = (GPM X PSI) / 1250.
For the Application of a Hydraulic Motor:
To Determine the Torque of a Hydraulic Motor -- (GPM x PSI x 36.77) / RPM = Torque (in-lbs)
Calculating RPM / GPM of Pump:
A pump must be connected to an electric motor or gas or diesel engine with the correct ratio of pulleys
and belts to attain the required speed and GPM. The use of a Variable Frequency Drive (VFD) may also
be used to control the RPM of a properly sized electric motor when variable ows are required.
(Max. Pump RPM / Rated Pump GPM) x Required Pump GPM = Required Pump RPM
To calculate a pulley diameter one (1) pulley diameter and the required pump RPM must be known:
(Pump RPM x Pump Pulley Diameter) / Motor RPM = Motor Pulley Diameter
(Motor RPM x Motor Pulley Diameter) / Pump RPM = Pump Pulley Diameter
Common Specications:
Inlet Pressure ..-4.35 to 145 PSI (-0.3 to 10 Bar)
Max. Temperature ..................140 oF (60 oC)
Crankshaft Diameter..............1.38” (35mm)
Crankcase Oil Capacity .........1.2 Gal. (4.6 L)
Inlet Ports ..............................(2) 3/4” BSP
Discharge Ports .....................(2) 1/2” BSP
Stroke ....................................1.81” (46mm)
Weight ...................................176 lbs (80 kg)
Shaft Rotation ..Top of Pulley Toward Fluid End
Materials Used for MP Pumps:
Manifold ........AISI 303 Stainless Steel
Plungers .......Solid Ceramic
Valves ........... Duplex Steel
Seals............. Aramide/Teon Packing
Gear End ...... Spheroidal Cast Iron
Crankshaft .... Drop-forged and case-hardened
Consult the factory for special requirements that
must be met if the pump is to operate beyond
one or more of the limits specied above.
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