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28.2.2.1
In addition to the standard hydrostatic test, an air pressure leakage test at 40 psi (2.7 bar) shall be conducted for 24 hours. Any leakage that results in a loss of pressure in excess of 11/2 psi (0.1 bar) for the 24 hours shall be corrected.
28.2.2.2
Where systems are installed in spaces that are capable of being operated at temperatures below 32°F (0°C), air or nitrogen gas pressure leakage tests required in 28.2.2 shall be conducted at the lowest nominal temperature of the space.
28.2.2.3
Pipe or tube specifically investigated for suitability in dry pipe and double interlock preaction system(s) and listed for this service, shall be permitted to be tested in accordance with their listing limitations.

Related Code Sections

25.2.2.2 Systems Acceptance,
Where systems are installed in spaces that are capable of being operated at temperatures below 32°F (0°C), air or nitrogen gas pressure leakage tests ...
25.2.2.2 Systems Acceptance,
Where systems are installed in spaces that are capable of being operated at temperatures below 32°F (0°C), air or nitrogen gas pressure leakage tests ...