| A Self Priming Pump is a pump which has been | | | | the air is separated from the liquid and the air is |
| specifically designed to allow the pump to re-prime | | | | expelled out through a discharge pipe, whilst the |
| itself when under lift conditions. | | | | liquid returns to the priming chamber. This action |
| These types of pumps are extremely efficient | | | | repeats itself until the air from the suction piping is |
| because they eliminate the need for ejector and | | | | expelled and replaced by pumpage and the priming |
| vacuum pumps and also foot valves, which may | | | | has been completed. |
| become clogged and in turn may become | | | | Self priming pumps are used in many different |
| impractical to use for remote or prolonged | | | | industries and have a wide variety of applications. |
| operation. | | | | Some of these industries can and use can |
| The pump is designed to self-prime and it is | | | | include:o Wastewatero Food processingo |
| important to understand how this is achieved. By | | | | Automotiveo Steelo Quarry & miningo |
| definition a self priming pump is a pump which can | | | | Petrochemical |
| clear its passages of air if it becomes air bound | | | | Pumps are used to move liquids, slurries and fluids |
| and continue delivery of the pumpage without | | | | such as gases. A pump achieves this by displacing |
| outside attention. | | | | a volume by mechanical or physical action. Pumps |
| This is achieved by retaining a charge of liquid | | | | do not create pressure, they displace fluids by |
| sufficient to prime the pump within the casing. | | | | causing a flow. |
| When the pump is started a rotating impeller | | | | There are five major groups of pumps and these |
| creates a partial vacuum ; air from a suction pipe | | | | are;o Direct lifto Displacemento Velocityo Gravityo |
| is drawn into this vacuum and is mixed into the | | | | Buoyancy |
| liquid drawn from the priming chamber. The | | | | The efficiency of a pump is very important and |
| resulting air-liquid mixture is then pumped into an | | | | pumps should be tested on a regular basis. |
| air separation chamber which is in the casing. Here | | | | |