Does anyone know if there are any specific reasons why API has added note 4 to paragraph 220.127.116.11 in the 11th Edition of API 650, June 2007? The note states that tanks with diameters less than 50' but greater than 10.5' require a minimum thickness of 0.25" for the lowest shell course, rather than a minimum of 0.1875" from the table for the remaining shell courses. In previous versions, the minimum thickness was 0.1875" for all courses in tanks up to 50' in diameter. My understanding is that API has established these minimum thicknesses based on erection requirements. But I am curious why now they have added this new requirement. If anyone has any ideas or knowledge to share, it would be greatly appreciated.
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