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Tanks with a connection in the bottom or the end for gravity-dispensing liquids shall be mounted and equipped as follows:
  1. Supports to elevate the tank for gravity discharge shall be designed to carry all required loads and provide stability.
  2. Bottom or end openings for gravity discharge shall be equipped with a valve located adjacent to the tank shell that will close automatically in the event of fire through the operation of an effective heat-activated releasing device. Where this valve cannot be operated manually, it shall be supplemented by a second, manually operated valve.
The gravity discharge outlet shall be provided with an approved hose equipped with a self-closing valve at the discharge end of a type that can be padlocked to its hanger.

Related Code Sections

5704.2.9.5.1 Flammable and Combustible Liquids, Overfill Prevention
and discharging by gravity back to the outside source of liquid or to an approved location. Tanks containing Class IIIB liquids and connected to fuel-burning ...
5704.2.9.5.1 Flammable and Combustible Liquids, Overfill Prevention
and discharging by gravity back to the outside source of liquid or to an approved location. Tanks containing Class IIIB liquids and connected to fuel-burning ...