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5704.2.7.3.5.3 Tanks storing Class I liquids.
Vent piping for tanks storing Class I liquids shall not be manifolded with vent piping for tanks storing Class II and III liquids unless positive means are provided to prevent the vapors from Class I liquids from entering tanks storing Class II and III liquids, to prevent contamination and possible change in classification of less volatile liquid.
5704.2.7.4 Emergency venting.
Aboveground tanks shall be equipped with additional venting that will relieve excessive internal pressure caused by exposure to fires. Emergency vents shall not discharge indoors. The venting shall be installed and maintained in accordance with NFPA 30.
Exception: Tanks storing Class IIIB liquids that are larger than 12,000 gallons (45420 L) in capacity, located outdoors and not within the diked area or the drainage path of Class I or II liquids, do not require emergency relief venting.
5704.2.7.5 Tank openings other than vents.
Tank openings for other than vents shall comply with the requirements of FC 5704.2.7.5.1 through 5704.2.7.5.8.
5704.2.7.5.2 Filling, emptying and vapor recovery connections.
Filling, emptying and vapor recovery connections to tanks shall be located outdoors at a location free from sources of ignition and not less than 10 feet (3048 mm) away from building openings. Such openings shall be provided with a liquid-tight cap which shall be closed when not in use and properly identified.
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