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60.5.1.6.2 Piping, Tubing, Valves, and Fittings
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Piping, tubing, valves, fittings, and related components used for hazardous materials shall be in accordance with the following:
- Piping, tubing, valves, fittings, and related components shall be designed and fabricated from materials compatible with the material to be contained and shall be of a strength and durability to withstand the pressure, structural and seismic stress, and exposure to which they are subject.
- Piping and tubing shall be identified in accordance with ASME A13.1, Scheme for the Identification of Piping Systems, to indicate the material conveyed.
- Accessible manual valves, or fail-safe emergency shutoff valves operated by a remotely located manually or automatically activated shutdown control, shall be installed on supply piping and tubing at the following locations:
- Point of use
- Tank or bulk source
- Manual emergency shutoff valves and remotely located manually activated shutdown controls for emergency shutoff valves shall be identified, and the location shall be clearly visible, accessible, and indicated by means of a sign.
- Backflow prevention or check valves shall be provided when the backflow of hazardous materials could create a hazardous condition or cause the unauthorized discharge of hazardous materials.
- Liquids classified in accordance with NFPA 704 shall be carried in pressurized piping above a gauge pressure of 15 psi (103 kPa) having a hazard ranking as follows:
- The pressurized piping specified in 60.5.1.6.2(6) shall be provided with an approved means of leak detection and emergency shutoff or excess flow control in accordance with the following:
- Where the piping originates from within a hazardous material storage room or area, the excess flow control shall be located within the storage room or area.
- Where the piping originates from a bulk source, the excess flow control shall be located at the bulk source.
- Piping for inlet connections designed to prevent backflow shall not be required to be equipped with excess flow control.
[400:6.1.6.2]
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