Why do vertical pumps have a stronger cavitation resistance?
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Is it true that vertical pumps generally have a stronger resistance to cavitation than horizontal pumps? If so, what are the main reasons for it?
As long as they are all operations within the scope of the design process, no problems will arise. I really hadn’t noticed that claim; I’ll keep an eye on it :)
https://bbs.hcbbs.com/thread-698593-1-1.html This post mentions it
A vertical pump essentially increases the net positive suction head available (NPSHa) of the system. For example, if the NPSHa is calculated up to the midpoint of the pump inlet, then a value of 2m for NPSHa applies to horizontal pumps; whereas for vertical pumps, since the impeller’s suction inlet is below ground level, if it is located 2m underground, the NPSHa must be at least 4m.
NPSHr is determined by the design of the pump itself, whereas NPSHa is determined by the conditions at the user’s site. The larger the NPSHa, the less likely cavitation is to occur. The pump inlet of a vertical pump is quite a bit higher than the inlet of the first impeller stage, so it should be possible to achieve a higher NPSHa. That’s how I understand it.