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5704.2.7.3.6 Tank Venting for Tanks and Pressure Vessels Storing Class IB and IC Liquids
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Tanks and pressure vessels storing Class IB or IC liquids shall be equipped with venting devices which shall be normally closed except when venting under pressure or vacuum conditions, or with listed flame arresters. The vents shall be installed and maintained in accordance with Section 21.4.3 of NFPA 30 or API 2000.