Occasionally, we see some pipe labeling requirements that exceed those found in ASME A13.1. NFPA 2, 2023 has a few:
(emphasis by me)
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7.1.6.4.1 Except as provided in 7.1.6.4.2, piping systems shall be marked in accordance with ASME A13.1, Scheme for the Identification of Piping Systems, or other applicable approved codes and standards as follows: (1)Marking shall include the name of the gas and a direction-of-flow arrow. (2)Piping that is used to convey more than one gas at various times shall be marked to provide clear identification and warning of the hazard. (3)Markings for piping systems shall be provided at the following locations: (a) At each critical process control valve (b) At wall, floor, or ceiling penetrations (c) At each change of direction (d) At a minimum of every 20 ft (6.1 m) or fraction thereof throughout the piping run |