I know I know. Not a real exciting subject. When filling a glycol treated enclosed system. Is it any harder on the system pumps if the static ( no pump running) is at 20 psi vs. 80 psi. prior to system start up.
Wouldn't the system just be trying to create a delta P across the pump. I would not think static pressure high or low would make a difference. I do know that you need a minimum amount of static pressure.
I open to other theorys. Please weigh in.
I think you answered your own question. Static fill pressure is only to raise water level in relationship the the PRV. Not sure why you are getting such a high static, but like you said the pump itself will create its "Delta P" Just the same whether it's 20 or 80 psi. Using glycol should not be a problem though pump sizing will very a little depending on your percentage of glycol in system. Most of the time it's a non factor since most sizing have a "fudge factor" in the calculations. If you put gauges in the suction and discharge, your Delta P will still be the same.