installation order of suction pipes for submersible pumps

We are still preparing products.

But you can look at other categories.

Installation of suction pipes for submersible pumps is a critical step that often determines the longevity of the equipment and the overall efficiency of the pumping system. Improper arrangement of the piping can lead to the formation of air pockets, vibrations, or premature wear of mechanical seals. This article will guide you through an established installation procedure to help you avoid common operational errors.

Principle of correct flow direction of the liquid

The primary goal when installing a suction pipe is to ensure an even inflow of liquid without creating vortices that could draw air into the pump. In deep tanks or pits, it is essential to position the suction head sufficiently below the surface, yet at a sufficient distance from the bottom where sediments settle. A well-designed system also includes the use of anti-suction grates that prevent the entry of large solid objects.

The suction head must be placed at least 0.5 meters above the tank bottom to prevent the suction of sediments.
The distance from the side wall should be at least twice the pipe diameter to avoid lateral flow.
When using multi-stage pumps such as NKV 1/14 S T, it is necessary to ensure that all stages are fully submerged before starting.

Technical details of connection and sealing

A critical point during installation is ensuring a hermetic seal of all connections, as even the smallest leak will cause a loss of vacuum and reduce the pump's performance. For larger pipe diameters, it is advisable to use double flanged connections with high-quality rubber seals that compensate for minor shifts. When working with heavy-duty slurry pumps, such as the model FEKA FXV 20.07 M-NA, it is essential to follow the tightening torque of the bolts according to the manufacturer's technical documentation.

Use only stainless steel or galvanized connecting parts resistant to corrosion in an aggressive environment.
All threaded connections must be sealed with special sealing paste or Teflon tape suitable for potable water and chemicals.
For systems requiring air venting, we recommend integrating a air venting kit 6/4" directly into the suction pipe.

Preventive measures against cavitation

Cavitation, the formation and subsequent collapse of gas bubbles in the liquid, is one of the most destructive phenomena for the impeller and pump motor. It occurs mainly due to insufficient vacuum at the inlet, which is often a result of a too long or narrow suction pipe. When designing the system, always monitor the characteristic curve of the pump and ensure that the NPSH (net suction head) is always higher than the available suction head in real operation.

Specifications for slurry and dirty water

When pumping slurry water, the suction pipe must be designed to minimize the risk of clogging and prevent the settling of solid matter in the lower part of the pipe. It is recommended to use pipes with a larger diameter than the nominal inlet diameter of the pump, which reduces the flow velocity and thus the risk of sedimentation. In the case of pumps such as FEKA 600 T-NA 10H07, it is essential to ensure that the suction head is equipped with a robust filtering system that prevents the passage of rubber or metal debris.

Use pipes with the smoothest possible inner surface to minimize friction and sedimentation.
Ensure that the suction pipe has a sufficient slope towards the pump, if possible, for easier draining after shutdown.
Always install a check valve immediately after the pump outlet to prevent backflow of liquid and reverse motor rotation.

Protection against dry running

Even though it is a submersible pump, there are situations where it may be lifted above the liquid level, leading to immediate overheating and damage. Therefore, it is essential to install a protection system that automatically turns off the pump when the liquid level drops. Modern solutions use float switches or electronic sensors that monitor the tank condition. For systems requiring high reliability, submersible pumps are often combined with dry-running pumps, such as DKLP 40-1800 M Dry-running Pump - double flanged, which functions as a backup source or for water transfer to the tank.

Maintenance and inspection of pipe integrity

The long-term reliability of the system depends not only on correct installation, but also on regular inspection of the suction pipe. It is recommended to inspect the condition of seals, tightening of connections and the cleanliness of the inlet filter once a year. In the case of long-term operation in hard water, it is necessary to pay attention to the possible occurrence of lime deposits, which can narrow the pipe diameter and increase hydraulic losses. If you use multi-stage pumps, such as NKV 1/14 S T, it is important to monitor the inlet pressure, as any drop may indicate clogging or damage to the suction pipe.

Check the condition of rubber seals in the connections and replace them if they are visibly cracked or deformed.
Ensure that the suction pipe is not damaged by external influences such as tree roots or mechanical impacts.
After the season, always clean the pipe thoroughly and let it dry to prevent the formation of mold or corrosion.

Strategy for arranging multiple suction pipes

With larger tanks or when using multi-section systems, we often encounter the need to install multiple pumps on a common discharge pipe.

Frequently asked questions

Can I use plastic pipe instead of steel?

Yes, plastic pipe is suitable for most applications if it is made of material resistant to chemicals and has sufficient strength, while being lighter and cheaper than steel.

Why does my pump frequently shut off at low temperatures?

This may be caused by frost formation on the suction pipe or freezing of water in the tank, which blocks the flow; we recommend installing heating elements or insulating the pipe.

How often should I change the suction filters?

Filters should be changed or cleaned according to the degree of contamination, but generally it is recommended to inspect them at least once every three months depending on the quality of the liquid being pumped.

Correct installation of suction pipes is the basis for efficient and long-term operation of your pumping equipment, which will save you time and money on repairs. Adhering to the described procedures and recommendations will allow you to maximize the lifespan of your pump and prevent unpleasant malfunctions.

Do you have a question about this topic?

Not sure or dealing with a specific situation in your home? Write to us - we are happy to help.