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Pressure-relief valves for ammonia systems shall discharge in accordance with ASHRAE 15. Piping from Ammonia Refrigerant (Group B2) shall terminate above the roof of the highest story of the building and shall be at least 40 feet (12.192 m) from any adjoining building which extends above the roof and at least 40 feet (12.192 m) from any penthouse, skylight, fixed ladder or exhaust duct system. Piping shall terminate downward at an angle of 45 degrees from the horizontal, and shall be provided with a permanent warning sign attached to the piping at the point of termination. The sign shall have a yellow background and shall state in black letters not less than 3 inches (76.2 mm) in height in both Spanish and English.
AMMONIA VENT - DANGER AMONIACO DESCARGA - PELIGRO |
Two self-contained, breathing air apparatuses (SCBA) approved by the Bureau of Mines of the United States Department of the interior shall be kept in a suitable cabinet immediately outside the entrance to the machinery room for every system containing over one 1,000 pounds (453.6 kg) of a Group Al refrigerant that operates above atmospheric pressure or over 100 pounds (45.36 kg) of Ammonia (R-717) refrigerant. SCBA equipment shall be rated for at least 30 minutes. When a machinery room is required, at least two approved self-contained breathing apparatus, suitable for the refrigerant used, shall be located outside of, but close to, the machinery room. SCBA equipment shall be fire-resistance rated for at least 30 minutes.
Where required by Section 18-28-1104.2, the machinery room shall meet the requirements of this section in addition to the requirements of Section 18-28-1105.
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