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<br />individual vent pipe connected thereto. In no <br />case shall the point of connection between the <br /> <br />vent lines be lower than the top of any fill-pipe <br /> <br />opening. The 10vJ'er end of a vent pipe shall enter <br /> <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 />buildings or other structures. Additional swing <br /> <br />joints may be required as determined by the Chief. <br /> <br />II lb. Fill and Discharg-e Piping for Underground <br /> <br />'l'anks. F ill and discharge lines for Class I. and for <br /> <br />Class II and III liquids where practical, shall enter <br /> <br />tanks only through the top and shall be grad~d toward <br /> <br />the tank. <br /> <br />possible vapor release by means of a spring loaded <br />check valve or other approved device.' <br /> <br />-19- <br /> <br />r <br />