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1323.1 Required Pipe Sizing
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Piping systems shall be designed and sized to deliver the required flow rates at the utilization pressures. [NFPA 99:5.1.10.11.1.1]
1323.1.1 Mains and Branches
Mains and branches in medical gas piping systems shall be not less than DN15 (NPS 1/2) (5/8 inch O.D.) size. Mains and branches in medical-surgical vacuum systems shall be not less than DN20 (NPS 3/4) (7/8 inch O.D.) size. [NFPA 99:5.1.10.11.1.2, 5.1.10.11.1.3]
1323.1.2 Drops to Individual Stations
Drops to individual station outlets and inlets shall be not less than DN15 (NPS 1/2) (5/8 inch O.D.) size. [NFPA 99:5.1.10.11.1.4]
1323.1.3 Runouts and Connecting Tubing
Runouts to alarm panels and connecting tubing for gauges and alarm devices shall be permitted to be DN8 (NPS 1/4) (3/8 inch O.D.) size. [NFPA 99:5.1.10.11.1.5]
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