NFPA 12A-1997 Standard on Halon 1 301 Fire Extinguishing Systems

NFPA 12A-1997 Standard on Halon 1 301 Fire Extinguishing Systems. 2-1.4.3 The Halon 1301 containers used in these systems shall be designed to meet the requirements of the U.S. Department of Transportation in Subpart C, Section 178.36 through 178.68 of Title 49, “Transportation,” of the Code of Federal Reg- ulations, Parts 170-190, or the Canadian Transport Commis- sion’s “Regulations for Transportation of Dangerous Commodities by Rail,” if used as shipping containers. If not a shipping container, it shall be designed, fabricated, inspected, certified, and stamped in accordance with Section VIII of the ASME Unfired Pressure Vessel Code; independent inspection and certification is recommended. The design pressure shall be suitable for the maximum pressure developed at 130°F (55°C) or at the maximum controlled temperature limit. 2-1.4.4 A reliable means of indication shall be provided to determine the pressure in refillable containers. The means of indication shall account for variation of container pressure with temperature. 2-1.4.5 When manifolded, containers shall be adequately mounted and suitably supported in a rack that provides for convenient individual servicing or content weighings. Auto- matic means shall be provided to prevent agent loss from the manifold if the system is operated when any containers are removed for maintenance. 2-1.4.6 In a multiple cylinder system, all cylinders supplying the same manifold outlet for distribution of agent shall be interchangeable and of one select size and charge. 2-1.4.7 Storage temperatures shall not exceed 130°F (55°C) nor be less than -20°F (-29°C) for total flooding systems unless the system is designed for proper operation with storage tem- peratures outside this range. External heating or cooling shall be used to keep the temperature of the storage container within desired ranges. 2-2 Distribution. 2-2.1* Piping. 2-2.1.1* Piping shall be of noncombustible material having physical and chemical characteristics such that its integrity under stress can be predicted with reliability. Special corro- sion-resistant materials or coatings shall be required in severely corrosive atmospheres. The thickness of the pipe wall shall be calculated in accordance with ANSI B31.1, Power Pip- ing Code. The internal pressure for this calculation shall be the maximum storage pressure at the maximum storage tempera- ture [a 70 lb/ft 3 (1121 kg/m 3 ) density shall be assumed], but in no case shall be less than the following: (a) For 360 psig (2482 kPa) charging pressure, an internal pressure of 620 psi (4274 kPa) (130°F) (55°C) (b) For 600 psig (4137...