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<br />'-,. <br /> <br />vapors. Vent pipes two inches or less in nominal <br /> <br />inside diameter shall not be obstructed by devices <br /> <br />that will reduce their capacity and thus cause <br /> <br />excessive back pressure~ Vent pipe outlets shall <br /> <br />be so located that flanunable vapors will not enter <br /> <br />building openings or be trapped under eaves or <br /> <br />other obstructions. If the vent pipe is less than <br /> <br /> <br />ten feet in length or greater than h.,o inches in <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 case <br /> <br />shall a flame arrester be located more than 15 <br /> <br />feet from the outlet end of the vent line. <br /> <br /> <br />"' (2) Vent lines from tanks underground or <br /> <br />in buildings shall be used for no other purpose. <br /> <br />II , (3) Size of Vents. Each tank shall-be <br /> <br /> <br />vented thrQugh piping adequate in size to prevent <br /> <br />blow-back of vapor or liquid at the fill opening <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 />II '(4) Vent Piping. Vent pipes shall be so <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 conn~cted into <br /> <br />one outlet pipe. The outlet pipe shall be at <br /> <br /> <br />least one pipe size larger than the largest <br /> <br />-18- , <br /> <br />r <br />