How to select the sewage pump
The sewage pump currently visible on the market is often referred to as a non-blocking sewage pump. Is it true that there is no blockage? Not necessarily! Often the user’s sewage pump is blocked by debris in the sewage pool for a long time. The motor burned down, how to choose the sewage pump, which made many users nervous…
The selection of the sewage pump
The most critical problem for the sewage pump is the reliability problem, because the medium to be transported is a mixed liquid containing solid materials. This problem makes the requirements of the sewage pump in sealing, motor load capacity, bearing arrangement and selection are higher than that of the general pump. Therefore, when selecting the type, it is necessary to understand the sealing reliability and load carrying capacity of the sewage pump.
In order to improve the life of the sewage pump, most manufacturers at home and abroad are looking for ways to protect the pump, that is, when the pump is leaking, overloading, over-temperature and has other faults, it can automatically alarm and automatically stop and repair.
It is necessary to install a protection system in the sewage pump, which can effectively protect the safe operation of the electric pump. But this is not the key to the problem. The protection system is only a remedy after the pump has failed, and it is a relatively passive approach.
The key to the problem should be to start from the root and completely solve the problems of the pump in terms of sealing and overloading. This is a more active approach.
Selection Notice
Flow rate: The flow rate of the sewage pump should be selected according to the drainage second flow rate (unit of measurement: L/s); when there is displacement adjustment, it can be selected according to the maximum hourly flow rate (measuring unit: m3/h).
Head: The head of the sewage pump is determined according to the height of the lift and the loss of the pipeline is calculated. If the medium to be transported is a mixed liquid containing a certain solid medium (such as sediment), this problem makes the sewage pump have higher requirements on the motor bearing capacity, bearing arrangement, pump body seal, etc. than the general pump. Choose a self-priming sewage pump or a submersible sewage pump. When selecting and ordering, be sure to understand the proper sealing and load carrying capacity of your selected sewage pump.
the sewage pump used in the building includes a submersible sewage pump, a submerged drainage pump, a vertical sewage pump, and a horizontal sewage pump. The vertical sewage pump and the horizontal sewage pump require an isolation base and occupy a certain amount of space, so they are less used in buildings.
In the building, if the site is small and the displacement is not large, the submersible sewage pump and the submerged sewage pump may be preferred. The submerged sewage pump can generally be used in more important places, and its overall structure is compact, small in volume, small in noise, convenient in movement and simple in installation. The energy-saving effect is remarkable, the maintenance is convenient, there is no need to build a pump house, and it can be submerged into the water, which greatly reduces the construction cost.
In the public building facilities, a spare water pump should be set up according to each drainage collecting basin. It should be operated interactively in order to reduce the long-term load operation of the pump and improve the service life.
When extracting sewage with larger medium, the outlet pipes of submersible sewage pumps in different collection basins should not be combined and discharged. The submersible sewage pump should be equipped with a crushing device. When lifting sewage containing more fibrous materials, a cutting device or a large-channel submersible sewage pump can be used.
When extracting general wastewater, the submersible sewage pump outlet pipes of different collection basins may be considered and combined according to actual conditions.
when two or more pumps share a single outlet, valves and check valves should be installed on each pump outlet. When a single pump drain may cause backflow, a check valve shall be provided. It is not allowed to combine the pressure drainage and the gravity drainage pipe in the construction.
- High mechanical reliability, low noise and low vibration.
- It is necessary to comprehensively consider the lowest total cost of equipment, operating, maintenance and management fees.
- The selected model and performance meet the requirements of process parameters such as flow, head, pressure, temperature, cavitation flow, and suction.
- Must meet the requirements of the media characteristics. 1) For pumps that transport flammable, explosive, toxic or valuable media, it is required to use shaft seals reliably or use non-leakage pumps, such as magnetic drive pumps, diaphragm pumps, and shield pumps. 2) For pumps that transport corrosive media, it is required to use corrosion-resistant materials for convection components, such as fluoroplastic pumps. If the corrosion is not strong, engineering plastic pumps may also be used as appropriate. 3) For the pump conveying solid media, the convection component is required to be corrosion-resistant and wear-resistant. If necessary, the shaft seal is washed with a clean liquid.