Relief Vent Piping per ASHRAE 15-2004
Relief Vent Piping per ASHRAE 15-2004 (2005)-Sizing ammonia relief vents, once a simple process, has become more complicated as safety codes have evolved. In recent years, code officials have been scrutinizing vent pipe sizing much more heavily. The latest release of the ASHRAE Safety Standard for Refrigeration Systems devotes considerable ink to the sizing of relief vents, and provides the user with an equation for determining pressure drop in relief piping. This paper will show how to use the ASHRAE equation to solve for the pressure drop in relief vent piping, how to select a relief valve and three-way valve, and also show some strategies to bring existing nonconforming installations into compliance with the code.
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