Product Description
Zenit Grey GRG Grinder Pump
The Zenit Grey GRG Grinder Pump provides reliable submersible sewage lifting for wastewater containing fibres, filaments and shreddable solids. Its rotary cutting system reduces troublesome material before the pump sends it through the discharge pipeline.
Therefore, the Grey GRG submersible pump helps reduce blockage risks in systems with small-diameter rising mains. Moreover, its high-head hydraulics support applications with substantial elevation differences or long pressure pipelines.
Zenit Grey GRG Grinder Pump Design
The Zenit Grey GRG Grinder Pump uses a cast-iron multi-channel open impeller. In addition, a rotating triangular knife works closely against a plate with sharp-edged openings.
Consequently, the GRG rotary-knife system creates an effective cutting action. It reduces compatible solids and filamentary material before they enter the hydraulic casing.
Key Features and Benefits
The Zenit GRG sewage grinder provides:
- Cast-iron multi-channel open impeller
- Rotary triangular cutting knife
- Sharp-edged grinder plate
- Suitability for fibres and filaments
- Motor range from 1.1 to 7.5 kW
- Two-pole motor design
- 50 Hz and 60 Hz configurations
- Maximum flow up to 8.4 l/s
- Maximum 50 Hz head up to 53.3 m
- Maximum 60 Hz head up to 59.5 m
- Horizontal G1½-inch or G2-inch discharge
- Double silicon-carbide mechanical seals
- AISI 431 stainless-steel drive shaft
- Oil-chamber leakage sensor
- ATEX and IECEx versions available
Together, these features make the Zenit Grey GRG Grinder Pump suitable for professional sewage and wastewater systems.
Grey GRG Grinder Pump Performance
At 50 Hz, the Grey GRG range covers motor ratings from 1.1 to 7.5 kW. Moreover, selected models deliver flow rates up to 8.4 l/s and heads up to 53.3 metres.
Meanwhile, selected 60 Hz models also reach 8.4 l/s while developing heads up to 59.5 metres.
However, these figures represent separate maximum limits across the range. Therefore, engineers should select each GRG pump from its individual hydraulic performance curve.
GRG Rotary-Knife Grinding System
The GRG cutting system uses a triangular knife connected to the shaft and impeller. During operation, the knife moves closely across the perforated grinder plate.
As a result, the pump cuts compatible fibres and shreddable solids before hydraulic transfer. Moreover, special grooves help cut filaments near the shaft, where they might otherwise wrap around rotating components.
Zenit manufactures the cutter and grinder plate from hardened X102 CrMo 17 KU martensitic steel. Consequently, the system provides high mechanical strength for demanding wastewater duties.
Anti-Clogging Wastewater Hydraulics
After cutting, the pump directs the reduced fragments into the hydraulic casing. In addition, Zenit’s Anti-Clogging System helps move suspended fragments towards the discharge.
Therefore, the Zenit Grey GRG Grinder Pump can support wastewater transfer through relatively small-diameter pressure pipelines.
However, operators should prevent stones, metal objects and other non-shreddable materials from entering the sump.
Motor, Seals and Monitoring
The Grey GRG pump uses Class H insulation, IP68 protection and thermal devices within the stator. Consequently, the motor supports demanding civil and industrial operating cycles.
Moreover, two silicon-carbide mechanical seals operate inside a large oil chamber. The oil lubricates and cools the seal faces while protecting them from wastewater contamination.
In addition, a moisture sensor monitors the seal chamber. Therefore, operators can detect water ingress early and schedule maintenance before serious damage develops.
Zenit GRG Installation Options
Zenit supports free-standing and permanent installation of the GRG grinder pump. Alternatively, installers can use compatible vertical or horizontal bottom-coupling systems.
As a result, technicians can remove the pump from the sump without entering the chamber. Moreover, the bottom coupler helps maintain alignment with the discharge pipe.
Zenit GRG Applications in India
The Zenit Grey GRG Grinder Pump may support applications across India such as:
- Residential sewage lifting
- Municipal and civil wastewater stations
- Hotels and restaurants
- Campsites and leisure facilities
- Sports facilities
- Livestock wastewater
- Textile process wastewater
- Paper-industry wastewater
- Food-processing effluent
- Tannery wastewater
- Agricultural processing water
- Pressure sewer systems
Moreover, the grinder design suits wastewater containing shreddable fibres and filaments. Nevertheless, engineers should review solids type, liquid temperature and chemical composition before selection.
Hazardous-Area Configurations
Zenit offers selected Grey Series models with ATEX and IECEx certification.
Therefore, suitable configurations may operate in specified potentially explosive gas atmospheres. However, certification depends on the exact ordered model. Engineers should verify the pump nameplate, certification and permitted installation zone before use.
Selecting the Correct Zenit GRG Pump
Correct selection depends on:
- Required flow and total head
- Fibre content
- Solids type
- Discharge pipe diameter
- Wastewater temperature
- Installation method
- Operating frequency
- Motor rating
- Hazardous-area requirements
Therefore, engineers should select the Zenit Grey GRG Grinder Pump from model-specific hydraulic data. Otherwise, an unsuitable configuration may increase blockage risk, reduce performance or shorten equipment life.
Product Enquiries in India
The Zenit Grey GRG Grinder Pump is presented through Pumps Bharat for residential sewage, municipal wastewater, hospitality, food processing, textiles, livestock applications and pressure sewer systems across India.
When submitting an enquiry, please provide the required flow, total head, wastewater composition, fibre content, discharge pipe size, power supply and sump arrangement. Consequently, the available GRG configurations can be evaluated against the application requirements.