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18-28-1102.3.2  Sizing.
   Discharge piping shall be sized for simultaneous relief of the maximum quantity of refrigerant in the system, via the sum of the system's pressure relief devices. Systems utilizing different classifications of refrigerant of different pressures shall not have discharge piping interconnected. Discharge piping cannot be smaller than the opening on the relief valve. If run longer than 100 feet (30.48 m), increase pipe one size.