I'm trying to size a pump for a heating and cooling application for a chemical process. They need about 80 gpm with 275-300 ft of head using 55% ethylene glycol. The temperature range is 0 degrees F to 135 degrees F. I've been looking a centrifugal pumps but keep ending up at the top of the pump curve. Would a gear pump be a better use? Or will I run into problems with the gear pump because of the temperature swings and thermal expansion of the gears? Is there a "rule of thumb" that says if above a certain head pressure a gear pump is better application?
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