## Finding flow rate with limited knowns

Hello all,

My basic problem is I'm trying to figure out what flow rate a diaphragm pump can provide through a length of pipe. I know the pump's max pressure and all the details of the pipe and the fluid (80w-90 gear oil), but can I solve this without knowing the velocity? Is there a way to solve the velocity through these (or other easily obtained) knowns?

Thanks,
IC
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 yes, what is the rpm and cubic inches/rev of the pump?
 It's a pneumatically powered diaphragm pump, not a gear pump. The cycle rate is not constant as it depends on the media being pumped. The more viscous the media, the slower the cycle time. Is there not a way to calculate flow rate without velocity?

## Finding flow rate with limited knowns

Alright, I've think I'm on the right track with Poiseuille's Law. Q=[(p1-p2)(radius^4)]/[(8/pi)(viscosity)(length)]

Change in pressure is 125psi