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Every such vessel shall be set on a 6-inch thick bedding of water-washed sand (beach sand shall not be used) free from soil, rock, or gravel. Before any back filling is done, the position of the vessel and the sand bedding shall be approved by the Chief. After such approval, the excavation shall be back filled with the same quality water-washed sand in such a manner that the sand back fill on the sides, ends, and the top of such vessel shall be at least 6 inches thick.
Every opening for the attachment of piping and appurtenant equipment shall be in the top of such vessel. No pipe or equipment connection to any such vessel shall be buried underground, but shall be aboveground, connected to a dome or passageway which is an integral part of the vessel, or shall be in a valve pit constructed as provided in Section 57.5003.2.4.3.2.6.
A collision barrier and a security fence, constructed as provided in Section 57.312, shall be installed and maintained to provide a minimum clearance of 5 feet from the outer portion of every pit, vaporizer, pump, valve, or pipe riser.
All buried containers shall be completely uncovered for an inspection of all external surfaces at least once every three years. The intervals may be changed at the discretion of the Chief if a test plate is buried adjacent to the container and shows no appreciable corrosion on inspection by the Department after three years of service; provided, however, that every container shall be uncovered at least every 15 years. The test plates shall be of the same material as the shell of the tank and shall be at least 1/4 of the container diameter in length and 6 inches wide, and shall be buried in the water-washed sand at least as deep as the lowest surface of the container and shall not be coated. Test plates shall be provided in accordance with the following:
1. Containers 10 feet or less in length, one test plate.
2. Containers more than 10 feet but less than 20 feet in length, two test plates, one on each side near opposite ends.
3. Containers 20 feet or more in length, one test plate for each 10 feet of length, placed on alternate sides at 10-foot intervals.
The filling pipe inlet connections for tanks filled on consumer’s premises shall not be located less than 15 feet from any opening into or under a building where such opening is below the level of the filling connections; and in no case shall the filling pipe inlet connection be located less than 10 feet from any building, street, or alley.
Indirect fired vaporizers shall be equipped with the following safeguards:
1. The device that supplies the necessary heat for producing steam, hot water, or other heating medium shall be separated from all rooms containing vaporizers, pumps, and central gas mixing devices by a vapor-tight one-hour fire-resistive separation.
2. Gas-fired heating systems supplying heat exclusively for vaporization purposes shall be equipped with automatic safety devices to shut off the flow of gas to main burners, if pilot light should fail.
3. A shut-off valve shall be installed on the liquid line to the vaporizer unit outside of any vaporizer room or building.
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