Guys, I've been working on this building w/ a system that includes 2 hot water , 2 pumps, and 40 vav boxes heating a 100k sq ft building. The mechanical engineer speckt it out to run at 100 psi. I've got make up water piped in and its right at 80 lbs and change. The suction side of the pumps are at 80 and the discharge is at 100-105. I've never worked on or put together a system w/ so much pressure. I don't understand why so much pressure? The flow control on the boxes are at 1 gpm and 2 gpm dpending on how big the unit is. It a four story building(tree floors above ground level and a basement) W/ the boiller in the basement and the air handler is on the roof. There is a small 1 1/4 3-way control valve on the roof by before the airhandler. The pumps and boilers and relief valve on everything are rated to 125 and 150 psi. If I were to change it I'd recommend a prv valve at the make water rp valve w/ it set to 45lbs. That would give me aprox 20 lbs on the roof( elevation change) and theat would be suficient. I'm not sure how all the componemts of the system will react at 100 psi for an extended period. Any thoughts?
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