Reasons why a vertical self-priming pump cannot draw in liquid
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This post was last edited by gaodi913 on 2016-2-3 at 12:16. A vertical self-priming pump fails to draw in liquid; it has a bottom valve. If the process fluid contains sediment and there is air in the inlet pipe, will it still not be able to transfer fluid? Does the pump seal affect its flow rate? ? ? Seek a solution
Due to mud blockage, there is air inside the inlet pipe, preventing a vacuum from being created; leakage at the mechanical seal also prevents a vacuum from forming. A vacuum is necessary for self-priming in these cases.
Check whether there is any corrosion-induced damage on the pump’s inlet pipe or if the flanges are leak-free. We have a self-priming pump that stops pumping when the liquid level drops to a certain level; it turned out that there was a corroded hole in the inlet pipeline, and whenever the liquid level dropped to that level, air was drawn in, preventing the pump from functioning properly. Later, we fixed the issue by pressing on the inlet tank, but we plan to replace the inlet pipeline during the next maintenance session.
The machine seal, as well as the suction pipe, must not leak; otherwise it cannot operate and no flow can be achieved. The medium contains solids and has a certain concentration; this affects the suction height. If it exceeds the pump’s vacuum limit, the check valve cannot open, and no flow will occur.
Check the installation height and whether there is any leakage at the seal
Check: 1. Is it blocked?； 2. Has the exhaust work been completed? ； 3. Are there any air leaks?
If a vacuum cannot be created due to a leak in the seal of a self-priming pump, it will not be able to draw in fluid; in such cases, check for any air leaks or blocked pipes.
Either fill the pump with water and give it a try, or check if the inlet is blocked
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