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Pump design for piping

Pump design for piping

Pump design for piping

(OP)
Hello folks,
          I am an engineer that just started right out of school. One of my first projects handed to me is the redesign of a pump. They want the flowrate to be 60mL/min @ 110psi. This comes through a graduated cylinder of about 2in id, through tubing of 0.25in id, up through the pump and out into more tubing same id, then into stainless steel piping system with 110psi. I have been working it all out with the help of Fundamentals of Fluid Mechanics by Bruce R. Munson. However, I get that the pump is only producing 0.75W of power to the system, and cannot figure out the right way to convert this to the force. It seems like such a small number for this to be true. Any help, or any point in the right direction would be nice. Thanks

RE: Pump design for piping

I love your units mL/min at 110 psi is pretty creative.

Using your Fluid Mechanics text is probably least effective way to solve the problem.  Those texts (we all have them cluttering our shelves) talk about how things should be, not how they are.  Every Fluids text I've ever looked at considers emperical equations to be somehow evil, but every engineer I know who works in fluids lives and dies by emperical equations.  Get a copy of Crane Technical Paper 410 (while you're at it get a copy of Cameron Hydraulics).

I get 0.766 W for 110 psi head and 0.016 gpm.  Not much flow into not much pressure yields not much power required.

David

RE: Pump design for piping

(OP)
Yeah, I've seen that everyone seems to swear by the Crane papers. I just wasn't sure that my requirements are actually so small in the power department. Thanks for the double check.
Oh and by the way, yeah my units are just what my bosses ask for. They love the american/SI units crossover.

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