Mobile sewage pumps are used to pump waste water during temporary sewer diversions. Sewage work often takes place in densely populated urban areas. For this reason a highly reliable and quiet sewage pump installation is essential. A centrifugal pump from the BA series, fitted with a KS screw channel impeller is the perfect choice.

Solids and long-fibrous materials which are present in sewage water frequently lead to pump blockages. Further, the irregular volume flows with both air and gas formations present additional challenges. For this reason, not every waste water pump is suitable for pumping sewage water.

What are the important considerations to keep in mind when selecting a mobile sewage pump? If both the capacity to be pumped and the required pump pressure are known, then look at the sewage pumps overview to select the correct model. The pumps described in the overview are specially designed for pumping raw sewage. They are available with a diesel engine or as an electric pump and meet the features listed below.

Specific features of mobile sewage pumps

• The pump impeller. The design of the pump impeller is of critical importance and can go a long way to ensuring the pumps reliability for pumping sewage. In addition to the largest possible free passage, it is also important that the impeller is channel-shaped. The best solution to minimize the risk of blockages is a KS screw channel impeller. The sewage water then flows through the pump with minimal resistance.
  
  
• Large inspection covers. If the solids are larger than the free passage of the pump impeller, there is a risk of blockages in the pump. Cleaning a clogged centrifugal pump on site is an extremely unpleasant task. However, the presence of large inspection covers on the pump housing, on the check valve and float box offer a convenient solution. In this case the heavy suction and pressure hoses do not have to be disconnected when removing the blockage.
   
• Cutting grooves. Long fibrous material present in sewage water can build up over time behind or around the pump impeller. Such blockages can negatively affect the performance of the pump. In order to combat such problems, various parts of our sewage pumps, such as the seal plate, are fitted with cutting grooves as standard. When the pump impeller rotates these long-fibrous materials are shredded and exit the pump with the liquid.
                                                                                           
• Suction side aerator. The difference is in the details. The suction hose can easily be aerated with a manual valve on the float box of the BA pump. With a clogged suction strainer at the bottom of the sewer, the vacuum in the centrifugal pump increases. This reduces the pumps capacity and increases the risk of cavitation and vibrations. At this point it becomes very difficult to lift and clean the clogged suction strainer on the job site. However, when the pump is out of operation it can help to simply open the manual valve. The liquid column in the suction hose then flows back into the sewer. There is a good chance that the solid materials around the suction strainer will be washed away and the pumpset can be restarted.
  
  
• Vacuum system Mobile sewage pumps are installed dry. So they must always draw in sewage water. A reliable vacuum system is an important part of a sewage pump and enables the pump to quickly draw in the waste water, even from a newly installed and dry condition. A vacuum diaphragm pump is the best choice for this application. These are not prone to air bubbles, gas formation and contamination in the fluid.
   
• Automatic level control. The volume of water to be processed can vary greatly during sewer diversion projects. Depending on precipitation and peak use of sanitary facilities, the pump must be able to handle both small and large volumes of water. With an automatic level control, the mobile sewage pump automatically switches on or off using floats based on the rise and fall of liquid levels in the sewer. With electronically controlled diesel engines and electric pumps fitted with a frequency control we can take this one step further. Here the level is automatically controlled via the use of an optional pressure sensor which regulates the speed of the pumpset.

With a specially designed mobile sewage pump you can optimize all temporary sewer bypass work. Unnecessary blockages and associated problems can be prevented. You can save energy by running the pump only when needed, which further saves on maintenance costs.

How does a sewer bypass pump work?

It’s very simple, a mobile sewage pump from BBA Pumps is fitted as standard with all of the required features for sewage work. Once the pump and pipework have been installed, you just switch on the automatic level control. Then you can lock the canopy doors and head off home.

The sewage pump then starts automatically when the water level in the sewer rises. The vacuum system quickly sucks in the sewage until the KS centrifugal pump takes over. If the level in the sewer pipe drops, the engine stops again, significantly reducing energy usage and preventing unnecessary wear.

Contact us now for more information or a free quote.