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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 (12.192m) from any adjoining building which extends above the roof and at least 40 feet (12.192m) 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 |