Pump installation height
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I visited a manufacturer that used double-impeller pumps to feed a plate and frame filter press; the installation height was -6 meters. When I consulted the pump manufacturer about this, their staff said that the pump only needed to be installed below the liquid level, and that the pump’s manual did not include any parameters regarding the net positive suction head. Is it really true that an installation at -6 meters has no basis, and that double-impeller pumps don’t have a net positive suction head?
In confusion, a double-impeller pump must also be a centrifugal pump; it’s just the second stage of a multi-stage pump, right?
It’s probably because this pump factory isn’t professional; it’s likely that these pumps from this series haven’t been tested. If they had been tested, an NPSHr value would have been provided. The value of -6m is probably just an estimate
What he’s saying is completely nonsense. To put it simply, first of all, it doesn’t know the operating conditions of your system – things like the liquid pressure in your storage tanks or containers, as well as the saturated vapor pressure of the medium at those temperature and pressure levels. How can it then determine the effective net positive suction head? Second, it’s not clear how to determine the installation height based on the effective NPSH; generally, pumps come with an NPSH value, which represents the minimum NPSH required for that pump
Thank you to the people on the 4th and 5th floors; really, I need these no matter what. It’s amazing that the pump factory doesn’t take this into consideration – I’m stunned
-What does 6m mean? Almost all pumps meet this requirement; digging 6 feet deep is not appropriate. Give me the details, and I’ll tell you how to choose the right pump