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answered Jun 21, 2015 by guyredumis (540 points)

Atmospheric Relief System: One or more relief sources discharging into a piping system or single tail pipe directly to atmosphere.

Atmospheric Vent System: Normal and emergency venting sources discharging into a collection piping system directly to atmosphere.  It usually consists of one vent with minimal piping directed to the nearest safe location for discharge and disposition.  The system is designed to collect vapors from equipment operating near or at atmospheric pressure and at very low, steady discharge rates.

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