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Old 03-19-2011
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Water flow issues

I need some advice on hydrodynamics of a raw water system.

The genset that I am busy reconstructing used to have an external raw water pump, apparently electrically driven. Whilst I have the appropriate electric pump, I have a nervousness that it would be more likely to fail than a belt driven one.

So in my reconstruction, I have incorporated a belt driven pump of the same capacity but due to severe space limitations, I cannot place it into the system where it used to be without considerable re-engineering.

So my question is - in the sketch below (excuse the quality, pencil drawn), what would the implications to water flow be if the pump was located in a pull-orientation as opposed to a push-orientation?



I have a sneaky suspicion that the heat exchanger may lose some efficiency if the water is drawn through it under a vacuum as opposed to forced through it under a mild pressure.

As a possible variation, I could locate the pump in the circuit directly at the outlet of the heat exchanger but the position shown in the sketch is the line of my least resistance

Any ideas out there (or even better, previous experience)?
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