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Thanks to all for the advice. Just to clarify things, I've been retained to evaluate an existing water system. This is one of many actual and potential problems that I've identified.

Assume there is a high point in a water system. By opening a series of hydrants we lower the hydraulic grade line to the point where it intersects the pipe at the high point - no problem yet. If we continue to open hydrants the negative pressure at the high point eventually reaches the point...

I forgot to mention something in my previous response. Unless you can pump directly to atmosphere somewhere near the pump, you will only get part of the curve; however, the new curve should be similar to the orignal curve so you should be able to extrapolate. Also, the pressure gauge needs to...

You should be able to generate the curves rather easily. This is assuming you have decent flow meters, pressure gauges, and isolation valves on the outlet side of the pumps. Allow the pumps to run full blast at some moderate speed. Record the speed, flow, and pressure. Using the isolation...

Your equivalent pipe can actually be any diameter but the length will change. Assume a headloss from Point A at the beginning of the loop to Point B at the end. Determine the flow in each pipe for the assumed headloss. Add the two flows to get a total. Using the calculated flow, whatever...

As I understand it, you want to replace the two non-operational pumps. Do they pump to reservoirs or do they just pressurize the system? It sounds as if you have an adequate, but probably very unpredictable, power supply. I would suggest having either Gould or Grundfos supply the control...

SEMO as in Southeast Missouri. If so, hello from PBMO. I spent about a week in Haiti several years ago. The only thing less dependable than the electricity was the phone service. If a stormwater pump is needed, I'd suggest a motor driven pump. Voltage in Haiti is so erratic that I think a...

What sort of pumping application is this?

I am trying to develop a general relationship for the velocity needed to purge an air bubble from a water system with multiple high spots. Any suggestions.

I am trying to develop a general relationship for the velocity needed to purge an air bubble from a water pipe with multiple high spots. Any suggestions?