Lowara ZN855-05/2A-3R Stainless Steel 22kW Deep Well 8" Submersible Bore Pump with Semi-Axial Flow Impeller

Hydraulic design principles based on a five-stage assembly with two reduced impellers characterize this 8-inch range submersible unit. It serves as an efficient extraction tool for industrial cooling systems and large-scale agricultural distribution needing high-pressure lifts from aquifers. The unit supports vertical well mounting or horizontal deployment in distribution networks where the motor remains in the lowest position. This model is intended for municipal water supply projects requiring specific head parameters.

Operating parameters include a maximum head of 123.1 m and a delivery capacity scaling up to 1333 L/Min through the 125 mm outlet. Electrical power is supplied by a 22 kW motor drawing 47.3 Amps of rated current from a 415v three-phase supply. Efficiency is achieved through a semi-axial hydraulic arrangement rotating at 2900 rpm for efficient lifting in borehole environments. Performance data is verified for clean water with standard density and kinematic viscosity.

Material integrity is ensured through the use of cast AISI 316 Stainless Steel for wetted components including the diffusers and suction support. This variant is equipped with a Duplex Stainless Steel motor, providing specific material performance in aggressive water conditions. The assembly processes water containing suspended sand levels of 100 g/m³ and is rated for temperatures up to 25°C. A duplex stainless steel shaft is utilized to handle mechanical stresses during rotation.

Operational ratings include a 350-meter maximum immersion depth and a 198 mm maximum overall diameter including motor cable protection covers. A built-in non-return valve with a stainless steel spring is situated in the delivery head to prevent backflow and reverse rotation. Internal tolerances are managed by technopolymer POM-C wear rings and EPDM 70 bearing bushes supporting the duplex shaft. The pump is designed for continuous duty cycles in industrial borehole extraction.

Features

• EPDM 70 bearing bushes support the pump shaft assembly and handle mechanical loads during rotation.
• A duplex stainless steel taperlock system secures the impellers to the shaft for torque transfer.
• Internal technopolymer POM-C wear rings maintain hydraulic clearances and reduce internal friction.
• Mechanical connection of the 8-inch motor follows NEMA standards for industrial system compatibility.
• A stainless steel suction strainer excludes large particles from entering the hydraulic stages.
• The integrated non-return valve features a stainless steel spring to prevent fluid backflow.
• Stainless steel cable covers provide mechanical protection for motor power leads along the casing.