5704.2.7.5.5 Fill pipes and discharge lines.

For top-loaded tanks, a metallic fill pipe shall be designed and installed to minimize the generation of static electricity by terminating the pipe within 6 inches (152 mm) of the bottom of the tank, and it shall be installed in a manner which avoids excessive vibration.

5704.2.7.5.5.1 Class I liquids.

For Class I liquids other than crude oil, gasoline and asphalt, the fill pipe shall be designed and installed in a manner which will minimize the possibility of generating static electricity by terminating within 6 inches (152 mm) of the bottom of the tank.

5704.2.7.5.5.2 Underground tanks.

For underground tanks, fill pipe and discharge lines shall enter only through the top. Fill lines shall be sloped toward the tank. Underground tanks for Class I liquids shall be equipped with a vapor- and liquid-tight fill connection.

5704.2.7.5.6 Location of connections.

Filling, withdrawal and vapor-recovery connections that are made and broken shall be located outdoors at a location away from sources of ignition and not less than 10 feet (3048 mm) away from building openings. Such connections shall be closed and liquid-tight when not in use and shall be properly identified.

5704.2.7.5.7 Protection against vapor release.

Tank openings provided for purposes of vapor recovery shall be protected against vapor release by means of a spring-loaded check valve or dry-break connections, or other approved device, unless the opening is a pipe connected to a vapor processing system. Openings designed for combined fill and vapor recovery shall also be protected against vapor release unless connection of the liquid delivery line to the fill pipe simultaneously connects the vapor recovery line. Connections shall be vapor-tight.