Acceleration Head Calculation

Good but just bear in mind that the OP may work in Imperial gallons which is not the same as US gallons.

If the OP is "working" anywhere, they should already know how to do the calculations involved and the units.

I can't see anything in that link that tells him how to calculate acceleration head.

And?

Just that calculation of acceleration head was one of the things OP was asking for help with.

Yes, and one would hope that when OP saw how childishly simple it is to get such information by performing a simple search, they would have the gumption and intelligence to find it for themselves.

For OP: Gumption | Define Gumption at Dictionary.com

One can find about 30,800,000 results in 0.25 seconds if one would only take a second to search for the information.

Acceleration Head | Pumps & Systems Magazine

I know that you know this, too bad most who come here don't bother to try it.

Trivia: (Indy 500 is over half over with no cautions or wrecks, another first)

OK point taken .

I applaud your, and other's, willingness to take the time to type out complex explanations to problems for those who are not willing or able to do the work themselves.

Acceleration head is given by

h_a = L*V*n*C/K/g

where L = pipe length, V = velocity in pipe, based on nominal flow, n = speed, rpm, C = a constant for the type of pump - no. of cylinders, single or double acting, g = g. Length units what you prefer, as long as you're consistent, time seconds, but n must be rpm. K = a constant, 1.4 for cold water, 2.5 for hot oil, in the paper I'm looking at.

I have a whole list of figures for C for various pump types, let me know which yours is and I'll post.

Above works for suction and discharge, but on discharge can limit L to 15m if actual length is longer, as elasticity in the pipe and compressibility of the fluid mean h_a stops increasing after that. But it sounds like you're working on suction, and you'll probably need a pulsation damper. In that case you only need to allow for pipe length between the damper and pump suction. Depending how it works out, you might need a damper on the discharge as well.

NPSHr is not calculated, the figure comes from the pump supplier.

NPSHa is calculated, using acceleration head among other things. There's plenty of data out there.