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<br />, I <br /> <br />nominal inside diameter, the outlet shall be <br /> <br />provided with a vacuum and pressure relief device <br /> <br />or there shall be an approved flame arrester <br /> <br />located in the vent line at the outlet or within <br /> <br />the approved distance from the outlet. In no <br /> <br />case shall a flame arrester be located more than <br /> <br />15 fee"t from the outlet end of the vent line. <br /> <br />lit (2) Vent lines from tanks underground or <br /> <br />in buildings shall be used for no other purpose. <br /> <br />tI'(3) Size of Vents. "Each tank shall be <br /> <br />vented through piping adequate in size to prevent <br /> <br />blow-back of vapor or liquid at the fil~ opening <br />. <br /> <br />while tank is being filled. Vent pipes shall be <br /> <br />not less than 1-1/4 inches nominal inside diameter. <br /> <br />"' (4) Vent piping. Vent pipes shall be 50 <br /> <br />laid as to drain toward the tank without sags or <br /> <br />traps in which liquid can collect. They shall be <br /> <br />located SO that they will "not be subject to <br /> <br />physical damage. Vent pipes from tanks storing <br /> <br />the same class of liquids may be connected into <br />one outlet pipe. The outlet pipe shall be at <br /> <br />least one pipe size larger than the largest indi- <br /> <br />vidual vent pipe connected thereto. In no case <br /> <br />shall the point of connection between the vent <br /> <br />lines be lower than the top of any fill-pipe <br />opening. The lower end of a vent pipe shall enter <br />the tank through the top and shall not extend into <br /> <br />the tank more than one inch. Vent piping shall <br /> <br />incorporate swing joints at the points where <br /> <br />piping leaves the tank and where it connects to <br /> <br />-22'" <br />