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. � . . . ___. _.L' _..' _" _'___'_____.. �r�� F;� r �I��e� ]?�F,��T -1 1 �3�tf1 y � F i.�'i�l . . _, �}�. ; ¢�.�:: 9. When required by the local f�'e chief, multiple AST installations shall be protected by an approved fire protection system. Additional requirements for 2-HOUR PROTECTED AST Fire resistive 2-hour protected above ground storage tanks usually include steel tanks that are double wall and encased in some form of protective insulation such as reinforced concrete. These tanks are constructed to be fire resistive and thus have reduced requirements for separation between the tank and buildings and also between the tank and dispenser. A plain steel tank (either single or double wall) is not a 2-hour protected tank and must instead be installed following the spacing requirements for UL 142 or UL 921 tanks found on page 4 of this information sheet. This page covers the additional requirements for double wall fire resistive 2-hour protected tanks. The separation distances given here apply only to this type of tank and do not apply for single or double wall plain steel tanks. ASTs shall not exceed 12,000 gallons individual capacity or 48,000 gallons aggregate capacity at any one dispensing site. 2. ASTs 1'ess than or equal to 6,000 gallons shall be located at least 15 feet from property lines that can be built upon, including opposite sides of a public way. These ASTs shall also be located at least 5 feet from buildings and the near side of a public way (see the table below) 3. ASTs greater than 6,000 gallons shall be located at least 25 feet from property lines that can be built upon, including opposite sides of a public way. These ASTs shall also be located at least 15 feet from buildings and the near side of a public way (see the table at the bottom of this page). 4. ASTs shall have overfill prevention that will provide notification at 85% fill and automatically stop fuel flow at 90%. 5. Dispensing devices can be installed on or adjacent to the AST. 6. Antisiphon devices shall be installed on the external piping when the piping extends below the liquid level of the AST. 7. Fill openings shall have a spill container at least 5 gallon capacity. Minimum separation requirements for protected abovcground tanks lndividual "1'ank Capacity (gallons) Less than or equal to 6,000 Greater than 6,000 Minimum distance from properly linewhich is or can be built upon, including the opposite side of a public way 15 feet 25 feet Minimum distance � from the nearest side of I any public way or from � the nearest important building on the same i 5 feet 15 feet .. . _ Minimum I distance i between tanks I ! 3 feet 3 feet � ,��