NFPA 13D-1999 Standard for the Installation of Sprinkler Systems in One- and Two-Family Dwellings and Manufactured Homes.
3-1.2 Each sprinkler system shall have a drain and/or test con- nection with a valve on the system side of the control valve. 3-1.3 Additional drains shall be installed for each trapped por- tion of a dry system that is subject to freezing temperatures. 3-1.4* Where waterflow alarms are provided, inspector’s test connections shall be installed at locations that allow flow test- ing of water supplies, connections, and alarm mechanisms. Where sprinklers used in the system have a nominal K-factor smaller than 5.6, the inspector’s test shall be of the same size orifice as the smallest sprinkler. 3-2 Pressure Gauges. A pressure gauge shall be installed to indicate air pressure on dry systems and on water supply pres- sure tanks. 3-3 Piping. 3-3.1* Pipe or tube used in sprinkler systems shall be of the materials specified in Table 3-3.1 or in accordance with 3-3.2 through 3-3.5.
The chemical properties, physical properties, and dimensions of the materials in Table 3-3.1 shall be at least equivalent to the standards cited in the table and designed to withstand a working pressure of not less than 175 psi (12.1 bar). Exception: When multipurpose piping system pressures do not exceed 130 psi (8.9 bar) and when such systems are not equipped with a fire department connection, piping shall be permitted to be designed to withstand a working pressure of not less than 130 psi (8.9 bar). When nonmetallic piping is used for this application, it shall be permitted to be rated at not less than 130 psi (8.9 bar) working pressure at not less than 120 ° F (49 ° C ). 3-3.2* Other types of pipe or tube shall be permitted to be used, where investigated and listed for sprinkler systems by a testing and inspection agency laboratory. Listed piping materi- als including, but not limited to, chlorinated polyvinyl chloride (CPVC), polybutylene (PB), and steel differing from those pro- vided in Table 3-3.1 shall be installed in accordance with their listings and the manufacturers’ installation instructions.
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