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Pump NPSH: Velocity Head vs Acceleration Head

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processguy89

Chemical
Joined
May 4, 2020
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1
Location
CA
Hi guys,

I think I've been confusing myself using these two terms interchangeably (velocity head and acceleration head) in my NPSH calculations since the definitions are so similar.

I always thought acceleration head was a loss and only noticeable for a positive displacement pump. Therefore acceleration head should be SUBTRACTED in the NPSHa formula.

However, I saw this reference source for NPSH calculations (See page 3):
They are ADDING the velocity head (Hv) term in the NPSH calculation instead.

So I'm a little confused now, can someone clarify?

Thanks!
 
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