Grinder Wastewater Pumps

Submersible Grinder Pump – 12GDS


Designed for high Head sewage applications where a gravity system is not practical. Ideal for pressure sewage systems.


Solids handling capabilities: 3″ maximum
Discharge: 1 1⁄4″ NPT removable flange
Capacities: up to 46 GPM
Total heads: up to 106 feet TDH

Features and Benefits

  • Single phase pumps now have built-in overload protection.
  • Impeller: Silicon bronze, multi-vane semi-open, with pump-out vanes for mechanical seal protection. Balanced for smooth operation.
  • Grinder Cutter System: The anti-roping design, hardened cutter is keyed to the  motor shaft for positive drive. The cutter ring is specially designed to be reversed when the first side wears out thus doubling its life and reducing maintenance costs. The cutter system is designed and tested to pass items found in normal wastewater.
  • Casing: Heavy duty cast iron, volute type for maximum efficiency. Use with A10-12 guide rail system for ease of installation and maintenance.
  • Dual Mechanical Seals: Silicon carbide vs. silicon carbide outer seal and ceramic vs. carbon inner seal, stainless steel metal parts, BUNA-N elastomers. Upper and lower shaft seals are positioned independently and are separated by an oil-filled chamber. Optional Silicon/Tungsten Carbide outer seal available.
  • Optional Seal Sensor Probe: Located in oil-filled chamber. If pumpage should begin to leak past lower seal it indicates to pump control panel a fault has occurred. Requires optional Seal Fail Circuit in the control panel.
  • Fasteners and Pipe Plugs: 300 series stainless steel.

Models & Weights

12GDS1G31A1A – 110 lbs

12GDS1G21A1A – 110 lbs.

12GDS3G21A1A – 105 lbs.

12GDS3G31A1A – 105 lbs.

12GDS3G41A1A – 105 lbs.

12GDS3G51A1A – 105 lbs.

Performance Curves


Ready to select pumps as well as suction diffusers, triple duty valves, heat exchangers, air/dirt separators, PIC valves, and parts? Click below to open the new Bell & Gossett ESP-Systemwize selection tool and enter your duty points to begin selecting the most energy efficient system:


Sizing Tools:

Steam + Water Pressure Reducing Values

Software Tool and Application Support/Suggest Enhancements

Please click the button below to report issues and suggest enhancements.

Support Request

System Selection and Technical Product Support

Consult your local Bell & Gossett Representative for additional assistance.