DAB.S4 OL - 4" submersible pumps with oil-filled motor

The DAB.S4 OL series includes 4-inch submersible centrifugal pumps designed for use in wells and boreholes. These pumps are ideal for applications such as water supply, pressurization, irrigation, fire protection, and building distribution systems. They operate with clean, non-aggressive water and are built to handle up to 150 g/m³ of sand. The pumps feature technopolymer impellers, stainless steel casings, and integrated suction filters. They are certified for eco-design compliance and offer high efficiency with MEI ≥ 0.4 across the range.

Available in single-phase and three-phase configurations, these pumps support voltages of 1x230 V, 3x230 V, and 3x400 V at 50 Hz. They are suitable for vertical installation and can also be installed horizontally with a cooling jacket. The motor is oil-filled for lubrication and cooling, with components in contact with water made from AISI 304L stainless steel.

How to choose

• Match the pump model to the required flow rate and head, as indicated by the model number (e.g., S4 8/21 T for 8 m³/h at 21 m head).
• Ensure the discharge size (1 1/4" or 2") aligns with the system's piping and fittings.
• Select the correct voltage configuration (single-phase or three-phase) based on the electrical supply available at the installation site.
• Confirm compatibility with the fluid properties—only suitable for clean, non-viscous, non-aggressive water.
• Consider the maximum draft (up to 250 m) and ensure the pump meets the required depth for the application.

Frequently asked questions

Can the pump be installed horizontally?
Yes, horizontal installation is possible but requires the use of a cooling jacket to ensure proper motor cooling.

What is the maximum allowable sand content in the pumped water?
The pumps are designed to handle up to 150 g/m³ of sand in the water.

What materials are used for the impeller and casing?
The impeller is made from technopolymer, while the casing, shaft, and motor components in contact with water are constructed from AISI 304L stainless steel.