Product Description
Zenit Grey GRG Grinder Pump
The Zenit Grey GRG Grinder Pump provides reliable submersible sewage lifting where wastewater contains 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 prevent blockages 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 pump creates an effective scissor action. It cuts compatible solids and filamentary material before they enter the hydraulic casing.
Key Features of the Zenit GRG Sewage Grinder
- Cast-iron multi-channel open impeller
- Rotary triangular cutting knife
- Sharp-edged grinder plate
- Suitable 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 of 53.3 m
- Maximum 60 Hz head of 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 Series grinder pump range covers 1.1–7.5 kW. Moreover, selected models deliver up to 8.4 l/s and develop heads up to 53.3 metres.
Meanwhile, the 60 Hz range uses the same published power band. It also reaches 8.4 l/s; however, selected models develop heads up to 59.5 metres.
These figures represent separate maximum limits. Therefore, engineers must select each Zenit GRG sewage grinder from its individual 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 Grey GRG submersible pump cuts shreddable solids and fibres before hydraulic transfer. Moreover, special grooves help cut filaments near the shaft, where they could otherwise twist around rotating parts.
Zenit manufactures the cutter and grinder plate from hardened X102 CrMo 17 KU martensitic steel. Consequently, the system provides high mechanical strength and hardness for demanding wastewater duties.
Anti-Clogging GRG Wastewater Hydraulics
After cutting, the pump directs the reduced fragments into the hydraulic casing. In addition, Zenit’s Anti-Clogging System helps expel suspended fragments through the discharge.
Therefore, the GRG industrial sewage pump can convey treated wastewater through relatively small-diameter pipes. However, operators must prevent stones, metal objects and other non-shreddable materials from entering the sump.
Zenit GRG Pump Motor and Construction
The Zenit Grey project uses redesigned motors and hydraulics to improve performance, energy use and reliability. Consequently, each GRG motor and hydraulic combination supports its intended duty point.
Moreover, the cast-iron construction withstands demanding civil and industrial service. The Zenit Grey GRG Grinder Pump also uses Class H insulation, IP68 protection and thermal devices inside the stator.
Grey GRG Mechanical Seals and Monitoring
The Grey Series grinder pump uses two silicon-carbide mechanical seals inside a large oil chamber. Therefore, the oil lubricates and cools the seal faces while protecting them from wastewater contamination.
In addition, a moisture sensor monitors the mechanical-seal chamber. Consequently, operators can detect water ingress and plan maintenance before a serious failure occurs.
Zenit GRG Grinder Pump Installation
Zenit supports free-standing and permanent installation of the GRG rotary-knife pump. Alternatively, installers can use a compatible vertical or horizontal bottom-coupling system.
As a result, technicians can lift the pump from the sump without entering the chamber. Moreover, the bottom coupler maintains alignment with the discharge pipe.
GRG Sewage Grinder Applications
The Zenit Grey GRG Grinder Pump suits:
- Residential sewage lifting
- Civil wastewater stations
- Campsites and leisure facilities
- Restaurants and hotels
- Sports facilities
- Livestock-farm wastewater
- Textile process water
- Paper-industry wastewater
- Canning and food-processing waste
- Tannery wastewater
- Agricultural processing water
- Pressure sewer systems
Moreover, the grinder performs well where wastewater contains shreddable fibres and filaments. Nevertheless, engineers must review the solids type, temperature and chemical composition before selection.
ATEX and IECEx Grey GRG Pumps
Zenit offers selected Grey Series models with ATEX and IECEx certification. The published marking is II 2G Ex db h IIB T4 Gb.
Therefore, suitable configurations may operate in specified potentially explosive gas atmospheres. However, certification depends on the exact ordered model. Buyers must confirm the nameplate, certificate and installation zone before use.
Selecting a Zenit GRG Sewage Pump
Correct selection depends on flow, total head, fibre content, solids type and pipe diameter.
In addition, engineers should confirm the operating frequency, motor power, installation method, wastewater temperature and hazardous-area requirements. Therefore, specialists should select the Zenit Grey GRG Grinder Pump from model-specific hydraulic data.
Request a Zenit Grey GRG Pump in the UAE
Contact our pump specialists for technical selection, specifications and UAE pricing.
Please provide the required flow, total head, wastewater composition, fibre content, discharge pipe and sump arrangement. Consequently, our team can recommend the correct Zenit Grey GRG Grinder Pump model.