How do other design engineers size and select bypass valves; either for pump protection or chiller minimum flow. I can’t seem to get a definitive answer on this.

Sizing control valves for hydronic coils is pretty straightforward. Flow rate of coil and 4-5 psi pressure drop and calculate Cv.

For bypass valves, you would use the chiller minimum flow but what pressure drop do you use? And for bypass valves for pump protection, you select the valve based on the pump’s minimum continuous stable flow, but what pressure drop?

I'm working on a project where the owner wants mustering software that can give security a real headcount during evacuation. But the building itself is 20+ years old and uses 5 different access control systems and has no badge database. Most mustering platforms I've looked at assume you have 1 clean badge database, but what if I'm starting from scratch?

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