Black steel pipe shall be permitted when the system is installed in freezers where the air temperature is below 32°F (0°C) and the air supply is either nitrogen or a listed regenerative air dryer.
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Threaded joints shall be made with pipe threads that comply with ASME B1.20.1. Thread sealant tape or compound shall be applied only on male threads, and such material shall be of approved types, insoluble in water, and nontoxic.
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