5003.2.2.1 Design and construction.

Piping, tubing, valves, fittings and ancillary equipment used for hazardous materials shall be in accordance with the following:

   1.   Piping, tubing, valves, fittings and ancillary equipment shall be designed and fabricated from materials compatible with the material to be contained and shall be of adequate strength and durability to withstand the pressure, structural and seismic stress, and exposure to which they are subjected.

   2.   Piping and tubing shall be identified in accordance with ASME A13.1 to indicate the material conveyed.

   3.   Readily accessible manual valves, or automatic remotely-activated fail-safe emergency shutoff valves, shall be installed on supply piping and tubing at the point of use and at the tank, container or other source of supply.

   4.   Emergency shutoff valves shall be clearly visible and readily accessible. A durable sign shall be conspicuously posted immediately adjacent to such valves that identifies their location.

   5.   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.

   6.   Where gases or liquids having a hazard ranking of health hazard Class 3 or 4, flammability Class 4, or instability Class 3 or 4 in accordance with NFPA 704 are conveyed in pressurized piping above 15 pounds per square inch gauge (psig) (103 kPa), an approved means of leak detection and emergency shutoff or excess flow control shall be provided. 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 any other source of supply, the excess flow control shall be located as close to the source of supply as practical.

   Exceptions:

      1.   Piping for inlet connections designed to prevent backflow.

      2.   Piping for pressure relief devices.

5003.2.2.2 Additional regulations for supply piping for health-hazard materials.

Supply piping and tubing for gases and liquids having a health-hazard ranking of 3 or 4 in accordance with NFPA 704 shall be in accordance with ASME B31.3 and the following:

   1.   Piping and tubing utilized for the transmission of highly toxic, toxic or highly volatile corrosive liquids and gases shall have welded, threaded or flanged connections throughout, except where connections are located within a ventilated enclosure if the material is a gas, or an approved method of drainage or containment is provided for connections if the material is a liquid.

   2.   Piping and tubing shall not be located within corridors, within any portion of a means of egress required to be enclosed in fire-resistance-rated construction or in concealed spaces in areas not classified as Group H occupancies.

      Exception: Piping and tubing within the space defined by the walls of corridors and the floor or roof above or in concealed spaces above other occupancies when installed in accordance with Section 415 of the Building Code for Group H-5 occupancies.

5003.2.3 Devices, equipment and systems.

Devices, equipment and systems, including required detection and alarm systems, installed or used in conjunction with the storage, handling and use of hazardous materials shall be listed or approved.

5003.2.4 Installation of tanks.

Installation of tanks shall be in accordance with FC 5003.2.4.1 through 5003.2.4.3 and with the regulations of the New York State Department of Environmental Conservation as set forth in 6 NYCRR Sections 599 and 613.

5003.2.4.1 Underground tanks.

Underground tanks used for the storage of liquid hazardous materials shall be provided with secondary containment.

5003.2.4.2 Aboveground tanks.

Aboveground stationary tanks used for the storage of liquid hazardous materials shall be located and protected in compliance with the requirements for outdoor storage of the particular material involved.

5003.2.4.2.1 Marking.

Aboveground stationary tanks shall be marked as required by FC 5003.5.

5003.2.4.3 Flood hazard.

Hazardous materials storage tanks located in areas of special flood hazard or on the premises of Group I-2 occupancies that are hospitals located in shaded X-Zones (as defined in Section G201.2 of the Building Code) shall comply with Section G307.5 of Appendix G of the Building Code.