Installation and connection of submersible sludge pumps FEKA

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Installation and connection of submersible sewage pumps from the brand FEKA require precise adherence to procedures to prevent premature failures caused by overload or insufficient cooling. This article focuses on practical aspects of installation, which often include direct comparison with alternatives such as DKLP 40-1800 M Dry Running Pump, since each solution has its specific place in the system.

Key differences between submersible and dry systems

Submersible sewage pumps, such as models FEKA 600 T-NA 10H07 or FEKA FXV 20.07 M-NA, operate fully submerged in liquid, which eliminates the risk of dry running and ensures motor cooling via the surrounding fluid. In contrast, dry running pumps require precise setting of the suction pipe and frequent maintenance of seals, which requires a different approach to installation and operation.

Submersible pumps are ideal for continuous pumping of sewage water without the need for airtight system preparation.
Dry pumps require regular inspection of mechanical seals and the possibility of air venting via a 6/4" set.
The choice of type depends on the depth of the pit and the type of contamination, with submersible versions being more resistant to solid particles.

Preparation of the installation site and safety measures

Before physical installation, it is essential to check the stability of the pit floor and ensure sufficient space for operation and future maintenance. When working with electrical components, always disconnect the power supply and ensure that protective devices are installed according to current standards for high-risk workplaces. Improper site preparation can lead to the pump getting stuck on the bottom or being difficult to access for part replacement.

Ensure secure anchoring of the pump to the base to prevent vibrations during startup.
Check that the distance from the walls is at least 10 cm for proper air and water flow.
Always use insulated gloves and footwear when handling in a wet environment.

Electrical connection and protection against dry running

The electrical connection must be carried out according to the diagram on the type plate, with particular attention to the correctness of the phase and grounding, especially for three-phase motors. To increase reliability, it is advisable to integrate float switches or level sensors that automatically turn off the pump when the water level drops below a critical threshold. This is key to prolonging the lifespan, as dry running is the main cause of damage to mechanical seals and windings.

Use a separate circuit breaker with the appropriate current load for the specific FEKA model.
Install relay modules for protection against phase errors and asymmetry.
For larger systems, consider combining with frequency converters if you need to regulate performance.

Mechanical installation of suction and discharge pipes

With submersible pumps, it is not necessary to build an airtight suction pipe as with dry pumps, but it is essential to ensure the correct position of the suction to prevent vortex formation. The discharge should be routed as directly upward as possible, and it is recommended to use check valves to prevent backflow of water when the pump is stopped. For longer discharge lines, it is advisable to consider using multistage pumps, such as NKV 1/14 S T, if it is necessary to overcome large height differences.

Use flexible hoses for connections to eliminate the transfer of vibrations to the piping.
Ensure that the suction inlet is at least 1.5 times the diameter of the pipe from the bottom of the pit.
For systems with a high content of solids, use strainers at the inlet to catch large pieces.

Deaeration and maintenance during operation

Although submersible pumps are less prone to air locks, it is advisable to check the system integrity after a longer standstill or when changing the type of liquid. If you are working in a system where gases occur, we recommend installing a deaeration kit 6/4" for dry systems, while for submersible systems regular checking of the liquid level and the cleanliness of inlet filters is sufficient. Regular maintenance includes checking the condition of the cable, insulation, and replacing seals if necessary, which is a common step for older models with bronze impellers.

Monitor the motor temperature during normal operation, which should not exceed 80 °C.
Clean the inlet grilles of dirt at least once a month, depending on the load.
Drain the water from the pump after the season if it is to be shut down for a long period during freezing weather.

Frequently asked questions

How often should the oil be changed in submersible pumps?

Most modern FEKA submersible pumps do not have an oil chamber, as the motor is water-cooled, so oil is not filled or changed.

Can I use the same cable for all FEKA models?

No, the length and cross-section of the cable must be adapted to the motor power and the distance from the power source, otherwise voltage drop and overheating may occur.

What should I do if the pump does not stop when the maximum level is reached?

Check the function of the float switch or level sensor that controls the start and stop, or adjust its position.

Proper installation and adherence to technical parameters when using FEKA submersible sewage pumps significantly extend their lifespan and reduce service costs. For further questions regarding selection or maintenance, you can read our other articles on centrifugal pumps or solutions for dry-running systems.

Do you have a question on this topic?

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