What is the nature of the cooling water you are spraying them with? If you have added chemicals you probably can't just go to clean water sewer (CWS) or oily water sewer (OWS) with it; your regulator probably won't allow it. I don't think it's actually "cooling water" - or is it? If so, you will be paying for that in CT make-up makeup and in chemicals to control the increase in cycles of concentration if your spraying rate is high enough. So, I assume it is fresh water or utility water. Are you just opening a utility station wash water hose and spraying them down?
In any event, I doubt that the pumps were designed to be cooled in this fashion. I would address this to the extent possible with air cooling, or else look for a different type of pump.
The other thing you might try is give CSI (Controls Southeast Inc) a call and give them your pump vendor drawings. They might be able to design a jacket system for the pump casing, which would facilitate you towards then adding a closed CW loop. You could go, for example, from open top tank full of water, through a small pump to the casing and back to the tank and let the exposed surface area of the tank take care of the heat rejection; it would likely equilibriate at some acceptable point if the tank was large enough.
Regards,
SNORGY.
