Product Description
The Lowara 8GS75-3 is a compact 4-inch submersible bore pump for clean-water supply, sprinkler irrigation and pressure boosting. This 7.5kW model uses a three-phase 415V power supply.
Applications
- Water supply from drilled wells or cisterns.
- Tank filling and domestic or commercial water supply.
- Sprinkler irrigation.
- Pressure boosting.
- Fire-water supply.
Performance
- Flow at 246.7m head: 120L/min.
- Maximum head: 339.9m at zero flow.
Actual flow depends on the pumping water level, delivery height, required outlet pressure and pipe resistance.
The recommended volume and head beside the price are selection guides. Use the 8GS75 performance curve to check the flow available at the total head required by your installation.
Construction and water suitability
For clean water with a maximum sand content of 150g/m3. The front wear ring and floating impellers help resist wear from sand abrasion.
- Precision-cast stainless-steel upper and lower supports provide a durable coupling to the motor.
- A hexagonal pump shaft provides positive drive to the impellers.
- A stainless-steel non-return valve is built into the pump head.
Installation and controls
Keep the complete assembly submerged and clear of the bore bottom and sediment.
- Water cover while pumping: at least 1m above the pump outlet.
- Pump diameter allowance: up to 99mm, including the cable cover.
- Bore clearance: the bore’s internal diameter must be at least 3mm larger than the pump diameter. Also allow room for the electrical cable and installation fittings.
Motor cooling: water must flow past the motor at the speed required by the supplied motor’s instructions. Fit a suitable cooling sleeve if the installation cannot provide that cooling flow, including unsuitable wide-bore, cistern or tank arrangements.
Use suitable pipework and a separate safety cable, attached to the pump’s designated fastening point. Never lift or suspend the pump by its electrical cable. Cable extensions require suitable submersible cable and a waterproof joint.
Maximum water temperature in contact with the motor is 35°C, subject to the supplied motor’s temperature and cooling requirements.
Automatic tank filling or pressure operation requires suitable level or pressure controls. Three-phase operation requires suitable starting equipment and motor overload protection matched to the motor nameplate. Size the cable for the installation. Use dry-running protection where the water level can fall.
Limits for the 4OS motor configuration
These limits apply when the pump is fitted with a 4OS motor. Check the supplied motor’s nameplate and instructions; other motor configurations can have different limits.
- Maximum immersion depth: 150m below the water surface.
- Maximum supply-voltage variation: ±10%.
- Maximum starts: 30 per hour, evenly distributed.
The manufacturer’s horizontal-operation allowance for 4OS motors is limited to 2.2kW. It does not cover this motor rating.
Hydraulic efficiency
Minimum Efficiency Index (MEI): ≥ 0.4.
MEI is a standardised index used to assess hydraulic pump efficiency. This meets the minimum index stated in the manufacturer’s ecodesign documentation. It does not mean 40% efficiency and does not describe the combined efficiency of the pump and motor.
