Submersible Slurry Pumps GPN Series

Submersible Slurry Pumps GPN Series is a submersible high power, heavy-duty slurry pump incorporating an agitator to suspend solids enabling the pump to handle high concentration slurries. Being equipped with high-chromium cast iron wear parts, the pump delivers outstanding durability. The suction plate is adjustable enabling the pump to maintain the original performance*. The GPN utilizes a cooling water jacket to allow the pump to operate at low water levels for extended period of time without the fear of overheating.

GPN catalog photo


  • Transferring and draining bentonite slurry in piling works.
  • Draining cement slurry or sand-carrying water in foundation works.
  • Draining aggregate and ore wash water in mines and quarries.
  • Collecting sediments in grit chambers at wastewater treatment plants.
  • Pumping scale at steel mills.
High-powered slurry pumps that deliver powerful agitation for discharging slurries laden with silt, earth, sand or other particulate

The GPN-series is a submersible three-phase high power and extra heavy-duty slurry pump driven by a 4-pole or 6-pole motor. It is equipped with a high-chromium cast iron agitator that assists smooth suction of the settled matters. The other wear parts such as the impeller and the suction plate are also made of high-chromium cast iron for extra durability. The side discharge, spiral design allows smoother passage of the sucked solid matters. The motor is cooled by a water jacket that assures efficient motor cooling even when it operates with its motor exposed to air.

Performance Curves

Discharge Bore
Model Motor Output
Phase Starting Method Solids Passage
Dimensions L x H
Dry Weight*2
Cable Length
80 GPN35.5 5.5 Three D.O.L.*1 30 487 x 796 145 8
100 GPN411 11 D.O.L.*1 30 617 x 879 217 8
100 GPN415 15 D.O.L.*1 30 617 x 879 220 10
100 GPN422 22 D.O.L.*1 30 725 x 1102 415 10
150 GPN622 22 D.O.L.*1 30 725 x 1102 415 10
200 GPN837 37 Star-Delta 46 1015 x 1606 800 10

Side Discharge Design with Water Jacket

The side discharge, spiral design allows smoother passage of the sucked solid matters. The motor is cooled by a water jacket assuring efficient motor cooling even when the pump operates with its motor exposed to air.

1.Anti-wicking Cable Entry
Prevents water incursion due to capillary wicking should the power cable be damaged or the end submerged.

2.Motor Protector
Circle Thermal Protector (15kW and below)
Directly cuts the motor circuit if excessive heat builds up or overcurrent occurs in the motor.
Miniature Thermal Protectors (22kW and above)
React to excessive heat caused by dry-running. The bimetal strip opens to cause the control panel to shut the power supply.

3.Chromium Molybdenum Shaft
Made of SCM435 (JIS), chromium molybdenum steel (tensile strength 930 N/mm2 and over). It has the superior performance against a shock given at the instant of sucking hard foreign matters.

4.Inside Mechanical Seal with Silicon Carbide Faces (15kW and below)
Dual Inside Mechanical Seals with Silicon Carbide Faces (22kW and above)
Isolated in the oil chamber where a clean, non-corrosive and abrasion-free lubricating environment is maintained. Compared with the water-cooled outside mechanical seal, it reduces the risk of failure caused by dry-heating and adhering matter. The silicon carbide provides 5 times higher corrosion, wear and heat resistance than the tungsten carbide.
*GPN422/622/837 have the Oil Lifter forcibly lubricating and cooling the mechanical seal.

Model GPN415

5. High-chromium Cast Iron Impeller & Suction Plate

Made of high-chromium cast iron ensuring highest durability. Even if the performance drops due to wearing outof the impeller and/or suction plate, it can be improved by simply replacing the suction plate.

*GPN422/622/837 have an adjustable suction plate.

6. Agitating Mechanism
Consists of a shaft-mounted agitator and a dedicated strainer. The agitator made of high-chromium cast iron resists wear caused by abrasive particles, and it suspends solids to assist in pumping sediments in combination with the strainer.


GPN35.5 GPN411 GPN415 GPN422 GPN622 GPN837
PUMP Discharge Bore mm 80 100 150 200
Discharge Connection Hose Coupling
Solids Passage mm 30 46
Impeller Semi-open
High-chromium Cast Iron
Suction Cover Gray Cast Iron
Suction Plate High-chromium Cast Iron
Oil Seal Nitrile Butadiene Rubber
Casing Gray Cast Iron
Shaft Seal Inside Mechanical Seal (without Oil Lifter) Dual Inside Mechanical Seals (with Oil Lifter)
Silicon Carbide
Shaft Sleeve   403 Stainless Steel
Agitator High-chromium Cast Iron
MOTOR Type Continuous-duty Rated, Dry-type Induction Motor
Output kW 5.5 11 15 22 37
Phase Three
Pole 4 6
Insulation  E B F
Starting Method D.O.L.*2 Star-Delta
Motor Protector (built-in) CTP MTP
Leakage Sensor (built-in) - Electrode
ml 1100 2500 3600 9200
Turbine Oil (ISO VG32)
Frame Gray Cast Iron
Shaft Chromium Molybdenum Steel
ml 8 10
Cable Chloroprene Rubber
Dry Weight*1 kg 145 217 220 415 800