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Installation
September 2013 4-2 P/N 81-CO2MAN-001
In systems using high pressure supply, 3/4-inch (DN20) and smaller pipe may be Schedule
40. Pipe 1-inch (DN25) through 4-inches (DN100) shall be a minimum of Schedule 80.
Furnace butt weld ASTM-53 pipe shall not be used.
Stainless steel shall be TP304 or TP316 for threaded connections or TP304, TP316, TP304L
or TP316L for welded connections.
(b) NFPA 12 does not preclude the use of other piping materials providing an internal
pressure of 2,800 PSI (19.3 MPa) which will not exceed the maximum allowable stress
value published in the ASME Code for Pressure Piping, B-31.1, an American National
Standard.; in other words, the thickness of the pipe wall shall be calculated in accordance
with ASME B31.1.
In accordance with NFPA 12, Class 150 and cast-iron fittings shall not be used.
(c) High Pressure Fittings: Class 300 malleable or ductile iron fittings shall be used
through 2-inch (DN50) internal pipe size (IPS). Larger internal pipe sizes shall be forged
steel fittings. Flanged joints used in open sections of pipe shall be permitted to be Class
300. Flanged joints used in closed sections of pipe shall be Class 600.
Stainless steel fittings shall be type 304 or 316 in accordance with ASTM A 182, Class 3000,
threaded or socket weld, for all sizes 1/8-inch (DN6) through 4-inch (DN100).
4-3.2 Pressure Operated Actuation Pipe, Tubing and Fittings
The pressure operated actuation tubing must be 1/4-inch (6 mm) O. D. stainless steel
(0.035-inch (1 mm) wall thickness) or 1/4-inch (DN6), schedule 40 or 80 galvanized steel pipe.
The pipe or tubing must be routed in the most direct manner, with a minimum of fittings.
Tubing fittings can be flared or compression-type. The pipe, tubing and fittings must have a
minimum allowable pressure rating of 1800 psig. The pressure/temperature ratings of the
fitting manufacturer must not be exceeded.
Piping and tubing must be reamed free of burrs and ridges after cutting, threading, or flaring.
Upon assembly, pipe or tubing must be blown out with nitrogen, carbon dioxide, or dry
compressed air; and must be securely supported, braced, and isolated from vibration,
mechanical, or chemical damage.
Reprinted with permission from NFPA 12-2005. Carbon Dioxide Extinguishing Systems, Copyright © 2005, National Fire Prevention Association,
Quincy, MA 02169. This reprinted material is not the complete and official position of the NFPA on the referenced subject, which is represented
only by the standard in its entirety