I need some relief: Learn the difference between safety, relief and safety relief valves

摘要

A series of anomalies occurred in the boiler room one evening. The steel compression, tank for the hydronic loop flooded, leaving no room for expansion. Water will expand at 3% of its volume when heated from room temperature to 180℉ When the burner fired, the expansion of the water increased the system pressure within the boiler. The malfunctioning operating control did not shut off the burner at the set point, which caused the relief valve to open. The brass relief valve discharge was installed with copper tubing piped solid to a 90° ell on the floor and the tubing further extended to the floor drain.