Special cases of the self-priming capacity of centrifugal pumps
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A storage tank and its feed pump base are at the same elevation (0 meters). However, the pump inlet pipe extends from the top of the storage tank down to the bottom of the tank (a height of about 3 meters), and then passes through a section of horizontal pipe before dropping down to the pump inlet. In other words, this inlet pipe actually creates an upward pouch at the pump’s inlet (the piping cannot be adjusted). When a bottom valve is installed on the pipeline inside the storage tank, does this pump still need to be considered based on a 3-meter self-priming height? It can be treated as a regular centrifugal pump.
Regarding the pressure head, I personally think it should be considered in terms of ordinary centrifugal pumps. However, if the bottom valve leaks or if air enters at the inlet and self-priming is no longer possible, the pump needs to be primed.
It may not be correct; please have professionals provide corrections.
Is the calculation of NPSHa related to the type of pump? It is safer to use a self-priming pump. For ordinary centrifugal pumps, it is necessary to ensure that there is no gas in the inlet pipeline, meaning the pipeline must be filled with liquid before each start-up. From a piping perspective, such situations should be avoided.
Is the calculation of NPSHa related to the type of pump? It is safer to use a self-priming pump. For ordinary centrifugal pumps, it is necessary to ensure that there is no gas in the inlet pipeline, meaning the pipeline must be filled with liquid before each start-up. From a piping perspective, such situations should be avoided.