DAB S4 3/25 T 4OL – 4" submersible pump for wells and boreholes, 1.5 kW, 3 × 400 V

Product detailed description

S4 3/25 T 4OL (code 60190874) is a multi-stage submersible centrifugal pump DAB with a 4" diameter, suitable for wells and bored holes with a diameter greater than 4". It is driven by a three-phase 4OL oil-filled motor, with a rated power of 1.5 kW. It is suitable for water supply and pressurization in family homes and larger buildings, for irrigation, washing and fire protection systems.

Performance and dimensions

• number of stages 25, rated flow 3 m³/h
• delivery head 138 m at zero flow and 55 m at 4.2 m³/h
• rated power P2 1.5 kW (2 HP), rated current 4.6 A, supply 3 × 400 V, 50 Hz
• delivery nozzle 1 1/4", maximum diameter 99 mm, pump length with motor 1138 mm
• weight of the pump with motor 15.9 kg

Materials and construction

The pump casing, shaft with coupling, suction strainer and cable cover are made of stainless steel, the suction and delivery body from precision cast AISI 304 steel. The impellers and diffusers are made of technopolymer, the stage bodies are made of AISI 304 steel and the check valve is made of AISI 304 steel with NBR sealing. The 4OL motor has bearings lubricated and cooled by food-grade liquid, a flexible stator in a casing made of AISI 304L steel and a mechanical seal of carbon/ceramic. The hydraulics achieve an efficiency index MEI ≥ 0.4.

Installation and operation

The pump is installed vertically, and for horizontal installation the manufacturer recommends a cooling jacket. The water should be clean and non-aggressive, with a temperature of 0 to +40 °C and a maximum sand content of 150 g/m³; submersion is possible up to 250 m and the pump may start up to 20 times per hour. The motor can withstand operation with a frequency converter in the range of 30–50 Hz. Protection of the three-phase motor is ensured by the user in the electrical installation. The electrical connection must be carried out by a qualified electrician.

Technical parameters

Frequently asked questions

Into which well can the S4 3/25 T 4OL pump fit?
It is suitable for wells and boreholes with a diameter greater than 4". The maximum diameter of the pump is 99 mm and with the 4OL motor it can be submerged to a depth of up to 250 m.

Is motor protection required for the three-phase pump?
Yes. Motor protection for the three-phase version T must be provided by the user in the electrical installation, and the connection is the responsibility of an electrician.

What kind of water can the pump handle?
Clean, non-viscous and non-aggressive water without abrasive substances with a temperature from 0 to +40 °C. The sand content may be up to 150 g/m³.

Can the pump be installed horizontally?
It is installed vertically by default. Horizontal installation is possible, and the manufacturer then recommends using a cooling jacket.