OPERATION OF THE WATER PUMP WITH AIR AND ITS RESULTS
The operation of the Water Pump with air is a harmful situation for the water pump. This situation causes a decrease in the life of all pumps such as submersible pumps, centrifugal pumps and an increase in water pump failure. It is a negative situation in terms of cost and time. If there is air in the water pump, then the water pump cannot pump water as it cannot absorb the desired amount of water. One of the biggest problems that will occur as a result of the water pump making air is the cavitation.
Water pump selection is also important . When choosing a water pump, it must be ensured that the suction port of the water pump is suitable for the installation. When the selected water pump is wider than the suction line, the water pump cannot absorb the desired water and may cause cavitation. Therefore, when choosing a water pump, attention should be paid to the diameters of the suction and discharge lines and, if the water pump system is to be installed, the friction losses in the pipes. When choosing a water pump, the flow and pressure information, as well as the pipe through which this water will pass, should be carefully calculated. For example, passing a flow of 150 m3/hour through a 2” pipe will cause a lot of friction loss.
In order to prevent the Water Pumps from working with air, the Valve at the suction port must be checked. If cavitation occurs, a plug larger than the diameter of the suction port can be used.
Cavitation causes erosion in parts of water pumps. It causes abrasive and abrasive effects on the Water Pump. Cavitation also creates other problems. Loss of performance in the system, vibration problems may also occur, and the fluid in the system may lose its properties after a while. In short, if the pressure in the suction pipe is too low to keep the fluid in the liquid phase, cavitation occurs in the water pump. However, the steam volume increases the volume inside the water pump body. When the steam bubbles reach a certain size, the water pump causes an explosion on the impeller surface and erosion occurs on the impeller.
The centrifugal pump pressurizes the water when it is completely filled with water. Since the water pump, which has air in it, cannot pressurize the water until the air is discharged, the pressure drops in the installation and the water pressure rises again as soon as the pump empties the air. This event creates pressure shocks on the pump and in the installation. In addition, due to the formula P1 x V1 = P2 x V2, the air whose volume increases and decreases during pressure changes also increases the effect of the impacts in the water system.
The air entering the centrifugal pump primarily damages the pump. As a result of CAVITATION, abrasions and holes occur in the pump fan, which cannot find enough water. In addition, the entry of air into the pump along with the water creates impacts and pressure shocks on the system in several ways.
The parts that will be affected by the operation of the Water Pump with air are the mechanical seal, plastic impeller and diffusers. The sticking of water pump stages as a result of dry running is a very common failure. In order to prevent the water pump from re-airing after it has been bled, a level floater must be attached to the water tank where it is suctioned and set to stop the pump.