(e) Every AST which is installed after September 30, 1994 and used for the storage of Class IIIB liquids, excluding unstable liquids, shall be located in accordance with Table 3-5 of these regulations, except when located within a diked area or drainage path for a tank(s) storing a Class I or Class II liquid. When a Class IIIB liquid storage tank is within the diked area or drainage path for a Class I or Class II liquid, AST.31.3(b), (c), or (d) shall apply. (f) Spacing (Shell-to-Shell) between Any Two Adjacent ASTs, where one AST is installed after September 30, 1994, with tanks storing Class I, II, or IIIA stable liquids shall be separated in accordance with Table 3-7 in these regulations. For unstable liquids, the distance between tanks shall not be less than one-half the sum of their diameters. Table 3-1 STABLE LIQUIDS [Operating Pressure 2.5 psig (17.2kPa) or Less] Type of Tank Protection Minimum distance in Minimum distance in Feet from property Feet from nearest line that is or can be side of any public built upon, including way or from nearest the opposite side of a important building on public way and shall the same property be not less than 5 ft. and shall be not less than 5 ft. Floating Roof Protection for ½ times diameter of 1/6 times diameter of exposures tank tank None Diameter of tank 1/6 diameter of tank Vertical with weak Approved foam or ½ times diameter of 1/6 times diameter of seam inerting system tank tank Protection for Diameter of tank times diameter of ⅓ exposures tank None 2 times diameter of times diameter of ⅓ tank tank Horizontal and vertical Approved foam or ½ times Table 3-6 ½ times Table 3-6 with emergency inerting system relief venting to limit Protection for Table 3-6 Table 3-6 pressure to 2.5 psig exposures None 2 times Table 3-6 Table 3-6 Table 3-2 Stable Liquids [Operating Pressure Greater than 2.5 psig (17.2 kPa)] Type of Tank Protection Minimum Distance in Minimum Distance in Feet from Property Feet from Nearest Line that Is or Can Be Public Way or Built Upon, Including Nearest Important the Opposite Side of Building on the same a Property
(e) Every AST which is installed after September 30, 1994 and used for the storage of Class IIIB liquids, excluding unstable liquids, shall be located in accordance with Table 3-5 of these regulations, except when located within a diked area or drainage path for a tank(s) storing a Class I or Class II liquid. When a Class IIIB liquid storage tank is within the diked area or drainage path for a Class I or Class II liquid, AST.31.3(b), (c), or (d) shall apply. (f) Spacing (Shell-to-Shell) between Any Two Adjacent ASTs, where one AST is installed after September 30, 1994, with tanks storing Class I, II, or IIIA stable liquids shall be separated in accordance with Table 3-7 in these regulations. For unstable liquids, the distance between tanks shall not be less than one-half the sum of their diameters. Table 3-1 STABLE LIQUIDS [Operating Pressure 2.5 psig (17.2kPa) or Less] Type of Tank Protection Minimum distance in Feet from property line that is or can be built upon, including the opposite side of a public way and shall be not less than 5 ft. Minimum distance in Feet from nearest side of any public way or from nearest important building on the same property and shall be not less than 5 ft. Floating Roof Protection for exposures ½ times diameter of tank 1/6 times diameter of tank None Diameter of tank 1/6 diameter of tank Vertical with weak seam Approved foam or inerting system ½ times diameter of tank 1/6 times diameter of tank Protection for exposures Diameter of tank ⅓ times diameter of tank None 2 times diameter of tank ⅓ times diameter of tank Horizontal and vertical with emergency relief venting to limit pressure to 2.5 psig Approved foam or inerting system ½ times Table 3-6 ½ times Table 3-6 Protection for exposures Table 3-6 Table 3-6 None 2 times Table 3-6 Table 3-6 Table 3-2 Stable Liquids [Operating Pressure Greater than 2.5 psig (17.2 kPa)] Type of Tank Protection Minimum Distance in Feet from Property Line that Is or Can Be Built Upon, Including the Opposite Side of a Minimum Distance in Feet from Nearest Public Way or Nearest Important Building on the same Property
Colorado_Revised_UST_Regs_Jan09-3.docx