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0 0 <br /> A10.4.1 This section covers the structural maximum allowable number of perforations per <br /> assessment of steel tanks to determine whether 500 square foot area is 25; <br /> the tank is suitable for a minimum 10 year life <br /> extension by lining. The qualification of a steel <br /> tank for structural soundness shall be 4. The number of acceptable perforations per <br /> establishing the 500 sq - ft area for tanks less than 10 years of <br /> accomplished by visually <br /> age for repair and lining to provide for a <br /> quantity and size of perforations in the tank <br /> wall. Tanks meeting the repairs allowed minimum 10 year life extension by lining is less <br /> than for tanks older than ten years of age as <br /> requirements specified in sections A10.4.1 <br /> through A10.4.4 and repaired in accordance identified by the following: <br /> with sections A10.4.6 (weld repairs) or A10.4.7 <br /> (repairs by plugging) shall be qualified as <br /> suitable for a minimum 10 year life extension by 1 years=2 perforations <br /> lining: 2 years=4 perforations <br /> 3 years=6 perforations <br /> 4 years=8 perforations <br /> 5 years= 10 perforations <br /> A10.4.2 The following guidelines shall be used 6 years= 12 perforations <br /> to identify a tank that may be lined: 7 years= 14 perforations <br /> 8 years= 16 perforations <br /> 1. A tank having a perforation no larger than 9 years= 18 perforations <br /> one and one-half inches (1-1/2") in diameter, 10 years(see A10.4.2#3) <br /> except under the gauging opening, where the <br /> perforation may be no larger than two and one- <br /> half inches (2-1/2") in diameter, except as Perforations to be repaired shall be reamed until <br /> repaired in accordance with section A10.4.5 the edges of the hole are a minimum of 1/8 inch <br /> where the perforation repaired may be no larger thick. Tanks repaired in accordance with <br /> than 4" in diameter or as otherwise approved by section A10.4.5 may have up to an additional 6 <br /> holes per five hundred square feet. <br /> a professional engineer; <br /> A10.4.3 Structural Deficiency Limits - The <br /> 2. A tank has less than five (5) perforations following structural deficiency limits apply to the <br /> (none larger than one-half inch [1/2"] in repair of underground storage tanks in <br /> diameter) in any one square foot area, except as accordance with this standard, except as <br /> repaired in accordance with section A10.4.5 approved by a professional engineer. <br /> where there may be no more than seven <br /> perforations per any one square foot area; <br /> A tank shall not be repaired if; <br /> 3. A tank has less than twenty (20) 1.The tank is greater than 2%out of <br /> perforations (none larger than one-half inch round; <br /> [1/2"] in diameter) in a five hundred (500) <br /> square foot area, except as repaired in <br /> accordance with section A10.4.5 where the <br /> 19 <br />