e-GS Submersible

Summary

Product identification

The Lowara e-GS Series comprises 4-inch submersible electric pumps, designed for 60 Hz operation.

• Document Code: 191015711 Rev. A Ed.06/2017

Applications

These pumps are suitable for:

• Water supply from drilled wells and cisterns.
• Sprinkler irrigation.
• Pressure boosting.
• Fire-fighting.

Market sectors include Residential, Agriculture, and Industry.

Operating limits

Pump

• Delivery: Up to 27 m³/h at 3500 rpm.
• Head: Up to 300 m at 3500 rpm.
• Maximum Pump Overall Diameter (including cable cover): 99 mm.
• Maximum Immersion Depth:
  • 150 m (with 4OS motor)
  • 300 m (with L4C motor)
• Maximum Permissible Quantity of Sand: 150 g/m³.
• Delivery Port:
  • Rp 1 1/4 for 1GSL, 2GS, 4GS, 6GS versions.
  • Rp 2 for 8GS, 12GS, 16GS versions.
• Motor Power Range: From 0.37 to 7.5 kW.
• Liquid Characteristics: Performance values are valid for liquids with a density ρ = 1.0 Kg/dm³ and kinematic viscosity ν = 1 mm²/sec.

Motor

• 4OS Single-phase:
  • Power: From 0.37 to 2.2 kW
  • Voltage: 220-230 V, 60 Hz
• 4OS Three-phase:
  • Power: From 0.37 to 7.5 kW
  • Voltage: 220-230 V, 60 Hz or 380 V, 60 Hz
• L4C Single-phase:
  • Power: From 0.37 to 4 kW
  • Voltage: 220-230 V, 60 Hz
• L4C Three-phase:
  • Power: From 0.37 to 5.5 kW (220-230 V, 60 Hz) or from 0.37 to 7.5 kW (380 V, 60 Hz)
• Maximum Supply Voltage Variations:
  • ±10% (4OS motors)
  • ±6% (L4C motors)
• Maximum Number of Starts per Hour (evenly distributed):
  • 30 (4OS motors)
  • 40 (L4C motors)
• Horizontal Operation:
  • 4OS motors: Up to 2.2 kW
  • L4C motors: Up to 7.5 kW
• Maximum Water Temperature in Contact with Motor: 35°C.

Construction characteristics

Pump

• Abrasion Resistance: Features an abrasion-resistant construction with a front wear ring combined with floating impellers for optimum resistance to sand abrasion.
• Supports: Upper and lower supports are made of precision-cast stainless steel for corrosion resistance, durability, and sturdy motor coupling.
• Shaft: Hexagonal pump shaft ensures effective impeller driving.
• Non-Return Valve: Stainless steel non-return valve integrated into the pump head.
• Motor Coupling: e-GS series pumps can be coupled with either 4OS or L4C motors.
• Materials: See the official PDF for exact tabulated values regarding pump section materials.

Electrical

Motor Starting Systems

• Direct:
  • Suitable for low-power motors.
  • Starting current (Iₛ) = Rated current (Iₙ) x 4 to 8.
  • Starting torque (Tₛ) = Rated torque (Tₙ) x 2 to 3.
• Star/Delta:
  • Starting current (Iₛ) = Iₙ x 1.3 to 2.7.
  • Starting torque (Tₛ) = Tₙ x 0.7 to 1.
  • Motor is unsupplied for approximately 70 ms during star to delta changeover. Not recommended for submersible electric pumps with power above 10 HP due to rotor slowdown.
• Impedances:
  • Motor starts with a voltage lower than the rated one, achieved via impedances.
  • Lowara panels reduce starting voltage to 70% (e.g., Rated voltage Uₙ = 400 V, Starting voltage Uₛ = 280 V).
  • Switch to rated voltage occurs without power supply interruptions.
• Autotransformer:
  • Pump starts with a voltage lower than the rated one.
  • Lowara panels use an autotransformer with a voltage that is 70% of the line voltage (e.g., Rated voltage Uₙ = 400 V).
  • Switch to rated voltage occurs without power supply interruptions.

Motor - Control Panel Combination

• See the official PDF for exact tabulated values regarding motor and control panel combinations.

Mechanical / hydraulic

Hydraulic Performance

• Hydraulic performance range charts (Q vs H) are provided for 1GSL, 2GS, 4GS, 6GS, 8GS, 12GS, and 16GS series at 60 Hz. See the official PDF for detailed curves.

Dimensions and Weights

• Dimensions and weights tables are provided for 1GSL, 2GS, 4GS, 6GS, 8GS, 12GS, and 16GS series with both 4OS and L4C motors. See the official PDF for exact tabulated values.

Cooling sleeve

A cooling sleeve may be necessary if the calculated fluid speed (v) around the motor is less than the minimum required speed (vₘ) for proper motor cooling.

• Fluid Speed Calculation: v = (Q/2) / {π·[(D²/4) – (d²/4)]}
  • Q: operating flow rate of the electric pump (m³/s) – half of the flow is considered.
  • D: diameter of the well (m).
  • d: diameter of the motor (m).
• Cooling Sleeve Diameter Calculation: D = {4·[(Q/(vₘ·π)) + (d²/4)]}⁰.⁵
  • Q: operating flow rate of the electric pump (m³/s) – the entire flow is considered.
  • D: diameter of the cooling sleeve (m).
  • d: diameter of the motor (m).
  • vₘ: minimum speed of the fluid that flows around the motor (m/s).
  • If the pump operates at different flow rates, the minimum flow rate should be used for calculating the cooling sleeve diameter.

Installation guidelines

• Control Panel: Must be equipped with a main switch and thermal relay for overload protection.
• Non-Return Valves: Install one at 10 meters from the delivery ports, and an additional non-return valve every 30-50 meters of piping.
• Well Mouth: Install a gauge and gate valve at the well mouth.
• Dry Running Protection: Use electronic probes or floats.
• Cable Securing: Secure the drop cable to the pipe every 2-3 meters.
• Pump Placement: Ensure the electric pump is installed at a safe distance from the bottom of the well.
• Well Clearance: Maintain a minimum distance of 3 mm between the pump's diameter and the internal diameter of the well.
• Water Circulation: During operation, ensure the water circulation speed around the motor is at least 8 cm/sec.
• Minimum Dynamic Level: The minimum dynamic level of the water in the well must be at least 1 m above the pump’s delivery port.
• Inverter Installation: For inverter-controlled systems, a filter is suggested for cable lengths exceeding 20 meters.

NPSH (Net Positive Suction Head)

Cavitation is the formation of vapor-filled cavities in liquids when local pressure drops below the liquid's vapor pressure. This can cause damage to pump components.

• NPSH Definition: Represents the total energy (in m) of the liquid at suction under incipient cavitation conditions, excluding the vapor pressure.
• Static Height Verification Formula: hp + hz ≥ (NPSHr + 0.5) + hf + hpv
  • hp: absolute pressure applied to the free liquid surface in the suction tank (m of liquid).
  • hz: suction lift between the pump axis and the free liquid surface (m); negative if liquid level is below pump axis.
  • hf: flow resistance in the suction line and accessories.
  • hpv: vapor pressure of the liquid at operating temperature (m of liquid).
  • 0.5: safety factor.
• Suction Loss Tables:
  • Water Temperature (°C) vs. Suction Loss (m):
    • 20: 0.2
    • 40: 0.7
    • 60: 2.0
    • 80: 5.0
    • 90: 7.4
    • 110: 15.4
    • 120: 21.5
  • Elevation Above Sea Level (m) vs. Suction Loss (m):
    • 500: 0.55
    • 1000: 1.1
    • 1500: 1.65
    • 2000: 2.2
    • 2500: 2.75
    • 3000: 3.3
• Recommendations: Position the pump as close as possible to the liquid. For high suction heads (over 4-5 m) or high flow rates, use a suction line with a larger diameter than the pump’s suction port.

Water requirements

Civil Users

• Maximum Consumption for Each Delivery Point (l/min):
  • Sink: 9
  • Dishwasher: 10
  • Washing machine: 12
  • Shower: 12
  • Bathtub: 15
  • Washbasin: 6
  • Bidet: 6
  • Flush tank WC: 6
  • Controlled flushing system WC: 90
• Contemporaneity Factor: The maximum theoretical requirement is reduced by a contemporaneity coefficient. Formulas are provided for apartments with one or two bathrooms and different WC types.
• Flow Rate Table: A table of water requirements (l/min) for civil users is provided, showing values based on the number of apartments (1 to 200) and WC type (flush tank or controlled flushing system). See the official PDF for detailed tabulated values.
• Seaside Resorts: Consider increasing the flow rate by at least 20%.

Community Buildings

• Water requirements for community buildings (e.g., offices, department stores, nursing homes, hotels) differ from condominiums and are generally higher.
• These requirements must be determined case-by-case using analytical calculation methods.
• A diagram provides guidance on maximum contemporaneity flow rates for various community types. See the official PDF for the diagram.
• Seaside Resorts: Consider increasing the flow rate by at least 20%.

---

Disclaimer: This summary is based on extracted text and may not include all figures, footnotes, or the latest revisions from the original OEM PDF datasheet. Contractual data must always match the specific OEM PDF revision used on the project.

Official datasheet (PDF)

Lenntech datasheet mirror