DAB S4 3/25 M 4OL – 4" submersible pump for wells and boreholes, 1.5 kW, 1 × 230 V

Product detailed description

The S4 3/25 M 4OL (code 60190766) is a DAB multistage submersible centrifugal pump with a 4" diameter, designed for wells and boreholes wider than 4". It is driven by a single-phase oil-filled 4OL motor rated at 1.5 kW. It suits water supply and pressure boosting in family houses and larger buildings, irrigation, and washing and fire-fighting systems.

Performance and dimensions

• number of stages 25, nominal flow 3 m³/h
• head 138 m at zero flow and 55 m at 4.2 m³/h
• rated power P2 1.5 kW (2 HP), rated current 10.8 A, power supply 1 × 230 V, 50 Hz
• discharge outlet 1 1/4", maximum diameter 99 mm, length of pump with motor 1184 mm
• weight of pump with motor 17.9 kg

Materials and construction

The pump jacket, shaft with coupling, suction strainer and cable guard are made of stainless steel, the suction and delivery casings of investment-cast AISI 304 steel. Impellers and diffusers are made of technopolymer, the stage casings of AISI 304 steel on this model and the non-return valve of AISI 304 steel with an NBR seal. The 4OL motor has bearings lubricated and cooled by a food-grade fluid, a rewindable stator in an AISI 304L steel housing and a carbon/ceramic mechanical seal. The hydraulics reach an efficiency index of MEI ≥ 0.4.

Installation and operation

The pump is installed vertically; for horizontal installation the manufacturer recommends a cooling sleeve. The water should be clean and non-aggressive, at 0 to +40 °C, with a sand content of no more than 150 g/m³; immersion is possible down to 250 m and the pump may start at most 20 times per hour. The motor can run on a frequency converter in the 30–50 Hz range. The single-phase version requires a starting capacitor and a manually adjustable overload protection, both housed in a control panel ordered separately. The electrical connection must be made by a qualified electrician.

Technical data

Frequently asked questions

What borehole size does the S4 3/25 M 4OL pump fit?
It is intended for wells and boreholes with a diameter larger than 4". The maximum pump diameter is 99 mm and with the 4OL motor it can be immersed down to 250 m.

What has to be ordered separately for the single-phase pump?
A control panel with a starting capacitor and a manually adjustable overload protection. The manufacturer supplies it separately; it is not part of the pump.

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

Can the pump be installed horizontally?
It is normally installed vertically. Horizontal installation is possible; the manufacturer then recommends a cooling sleeve.