Centrifugal pump with priming tank and self-priming pump
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A regular centrifugal pump equipped with a priming tank can also achieve self-priming. So, what are the advantages and disadvantages of self-priming pumps compared to regular centrifugal pumps with priming tanks? When should which type be chosen?
Centrifugal pumps with priming tanks take up a lot of space and require extensive preliminary work, but they are actually quite useful. Self-priming pumps have more limitations, such as high flow rates and high head pressures, complex operating conditions, and limited choices of materials; as a result, they offer fewer options compared to centrifugal pumps. For example, 1000 cubic meters at 50 meters depth, desulfurization slurry (lime water) needs to be pumped up ； At this time, a centrifugal pump with a priming system is definitely necessary.
If both options are available, then one can use a pump to draw water from a tank; for example, with a flow rate of 100 and a head of 120, a centrifugal pump will have higher efficiency than a self-priming pump. Are there any other advantages?
There is also the material issue with self-priming pumps. . . Is it all stainless steel?
For high head applications, it’s better to use a non-self-priming pump
In principle, internal-circulation self-priming pumps are the preferred choice; these are the so-called pumps with a large belly. Ordinary centrifugal pumps equipped with a pre-priming tank are usually used when the self-priming height of a self-priming pump is insufficient or its parameters do not meet the requirements (such as flow rate and head). Centrifugal pumps with tanks occupy more space, are more expensive than self-priming pumps, have more connections (which increases the workload involved in installation), and require additional piping components.