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20.24.250 CFC Section 2703.2.2.1 Item 7 added — Secondary containment. Section 2703.2.2.1 Item 7 is added to read: 7. Secondary containment or equivalent protection from spills shall be provided for piping for liquid hazardous materials where a spill is determined to be a plausible event and where such an event would endanger people, property or the environment and for highly toxic, toxic, and corrosive gases above threshold quantities listed in Tables 3704.2 and 3704.3. Secondary containment includes, but is not limited to double walled piping. Exceptions: 1. Secondary containment is not required for corrosive gases if the piping is constructed of inert materials. 2. Piping under sub- atmospheric conditions if the piping is equipped with an alarm and fail -- safe -to -close valve activated by a loss of vacuum. 20.24.260 CFC Section 2703.2.2.1 Item 8 added — Low melt point materials. Section 2703.2.2.1 Item 8 is added to read: 8. ow melt point materials, such as plastic, shall not be used for oxidizing materials, flammable materials, combustible liquids, pyrophoric materials, toxic gases, highly toxic gases, or moderately toxic gases. Exception: Facility specific systems approved by the Fire Chief. 20.24.270 CFC Section 2703.2.2.2 amended — Additional regulations for supply piping for health hazard materials. Section 2703.2.2.2 is amended to read: 2703.2.2.2 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 toxic, highly toxic, moderately toxic gases or highly volatile corrosive liquids and gases shall have welded, or brazed connections throughout except for connections within an exhausted 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. 63