Wastewater pumps S-WP


Danpumps S-WP pumps.

From the smallest S-WP0 – suitable for light industrial effluents to the S-WP5 – capable of handling heavy duty wastewater jobs from cities and industries. A flowrate from 68-3500 m3/h and connections from DN50-DN600 with non-clogging impellers.


  • Different types of impellers fit in the same volute
  • Cartridge seal
  • High-efficiency IE3 Premium motors from Siemens with klixon thermo switches
  • Moisture sensor
  • Unique motor cooling system
  • Designed for easy maintenance

The design of the S-WP pumps is a combination between high efficiency, intelligent design and practical features.

The efficiency of the pump is very important to be able to reduce running costs of the pump and in the same time reduce the CO2 release to the environment, and this is achieved by the design of the impeller and use of high-efficient IE3 motors. It gives you a user-friendly pump with a long-life cycle which will reduce maintenance costs.

When choosing the impeller

The choice of impellers depends on the nature of particles in the fluid. Designed to fit in the same volute and customized according to customers demand.

By optimizing the impeller, we make sure to hit the wished duty point and thereby saving energy consumption. They are delivered in cast iron or in stainless steel as an option.

  • One or two channel impeller

    • Higher efficiency and some possibility of clogging
  • B-tween impeller

    • Less efficient than the channel impeller, but lower possibility of clogging
  • Vortex impeller

    • Less efficient, but no clogging

Cartridge seal

A user-friendly cartridge seal that makes it possible to change the seal without using any special tools or personal with specific skills, which eliminates any risk of improper installation.

The cartridge seal has built in an impeller for circulation of motor cooling fluid. The cartridge seal is pressure tested before shipment and ready for assembling.

How to replace the cartridge seal:

  • Tap oil
  • Loosen latch bolts
  • Tap cooling water from the cooling jacket
  • Remove impeller
  • 4 bolts for release
  • 2 pull threads

See animation

We have done the work for you – all-in-one to provide simple sealing solution and ease of installation. The service time of the seal is reduced compared to a normal double mechanical seal.

See assembly of cartridge seal

High efficiency motor from Siemens

The S-WP pump is equipped with a Siemens IP68 motor IE3. The Siemens motor has an efficiency of 95,8%. The motor is protected by the cooling jacket from getting overheated together with thermo klixon and moisture sensor.

Siemens Premium IE3 motor gives a significant cost reduction compared to the IE2 motor. The IE3 Premium motor from Siemens achieves a higher efficiency and a cost benefit of 20-45%.

IE3 efficiency is 95.8%

Fast lock latch bolts

To separate the pump very easily from the motor when doing service.

The pump will be separated thus the rest of the pump is lifted up without affecting the pipework.

This feature is very popular with the service staff, as it reduces to
maintenance downtime considerably.

The locks are made in stainless steel.

Oil tap drain

It is important to tap the oil. It is also important to tap the water from the cooling jacket before taking out the cartridge seal.

The pumps are equipped with oil tap drain making service and oil change very easy.

Thermo klixon

A standard protection in all of our motors for the S-WP pump range.

Thermo switches disconnect the power at temperature at 150° C this ensures that overheating will be avoided.

Cooling jacket

The closed cooling jacket is standard for the dry pit pumps and can be supplied as an option for wet pit pumps.

The system ensures an optional cooling of the motor, which avoids the risk of overheating. The pump is cooled by the internal media that circulates by the impeller in the cartridge seal, which transfers the heat to the bottom plate.

Moisture sensor

Is another standard protection in our S-WP pumps.

The moisture sensor measures if there is water in the oil and also if there is moisture in the stator house. Attached to a control panel an alarm will sound, when the moisture level is too high, and the pump will stop.

Adjustable wear-ring

DanPumps pumps uses an axially adjustable wear-ring to reduce the hydraulic loss between the impeller and the wear-ring.

By this feature the wear-ring can be regularly adjusted to optimize the pump efficiency when the pump starts to be affected by wear.

Dry, wet & portable wastewater pumps

The DanPumps S-WP product program is delivered for dry, wet or portable installations with the choice of a vortex, a B-tween or a channel impeller.

As an option, all DanPumps dry pit wastewater pumps can be delivered as a S-WN pump with an IEC standard motor →
see S-WN pumps

Dry pit

  • Vertical, permanent, dry installation with flange connection to suction and discharge piping.
  • Safe if flooding occurs
  • No visible rotating parts
  • Easy to install and retro-fit
  • Adjustable legs
  • Good environment

Wet pit

  • Semi-permanent, submersible pump installation on twin guide bars with automatic connection to the discharge pipe.
  • Connects directly to another installation by adapter
  • Flange to flange connection is by metal to metal contact → simplicity
  • Interchangeable and connects directly to other pumps

Portable pit

  • Portable, submersible pump installation connected to discharge pipe.
  • Easy to install
  • Adaptable base ring-fits 3’’, 4’’ and 6’’ suction flange drillings
  • Base ring is shock resistant
  • One pump multiple location
  • 90° flange hose connection