What is a Self Priming Pump?
A Self Priming Pump is a pump capable of drawing liquid from a level lower than the inlet. They are used in installations where the pump is above the fluid being pumped, such as above a storage tank and depending on the make and model, can pull anything from sea level to 9m. It is also important that you are sure your application and installation require a self-priming pump because, in some instances, these pumps can be less efficient than non-self-priming pumps.
Some pumps require flood casing in order to achieve self-priming, whilst others can dry run and automatically self-prime. At Tapflo, we supply a large variety of pumps that are self-priming, which includes:
Diaphragm Pumps – Our AODD Pumps can self-prime suction 5m dry or 8m wet.
Peristaltic Pumps – Tapflo UK is proud to work alongside Albin Pumps distributing their Peristaltic Pumps. These pumps can self-prime and have a suction of 9.8m dry or wet due to their operating principle.
Self-Priming Centrifugal Pumps – These pumps have 6m suction, but the head of the pump needs to be prefilled before use.
Twin Screw Pump – The Pomac Screw Pump, also available as a Double Screw Pump has a self-priming capability of up to 9 metres with water.
Flexible Impeller Pump – All of our Flexible Impeller Pumps (also known as Flexible Vane Pumps) are self-priming up to 6m dry.
What type of installation would we recommend a Self-Priming Pump for?
Before deciding whether you require a Self Priming Pump, it is important to know whether your pump will be installed above the fluid or below it. If your pump will be installed below the fluid, the weight of the fluid will force your product into the pump, therefore you won’t require a self-priming pump. However, if your pump is going to be installed above the fluid, the pump will be pulling product out of the tank or storage container and it will be important to decide how much suction is required.
Your pump will be chosen based on the requirements of dry suction and wet suction, as the suctions often differ. For example, if the tank is 5.5m deep and the pump is installed above the tank, you could use a Self-Priming Centrifugal which has a suction of 6m, but if your tank was 9m deep, you would require a Peristaltic Pump or a Diaphragm Pump.
Therefore, we would recommend self-priming pumps for installations where the pump is required to be above the fluid.