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Friday, January 27, 2017   By: ADI HAR-SHOSHAN [93] 4 Stars
1. Api-653 Paragraph 6.4.2 : Can somebody please clarify why the review should take place within 5 years from january 2012? and if not what is the consiquence ?
2. Tank that their initial recorded internal inspection was 50 years after construction and the floor was inspected in probabillstic method , can the next internal inspection be determind on the basis of this long term corrosion rate?

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Monday, January 30, 2017   By: ITS [1678] 2 Stars
Dont know if this can be answered to your satisfaction concerning aboveground storage tank inspection intervals. But my impression is the inspection interval review at 5 years is a generic inspection interval that is broadly based on AST inspection experience of the committee members, so no one falls between the cracks as reasonably as possible. As far as the consequences, the locale of the tank or jurisdiction the tank is located determines the consequences if any. Not all locales have laws or regulations and rules concerning this important tank inspection interval.

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Thursday, February 02, 2017   By: ITS2 [1678] 2 Stars
Longterm corrosion rate is critical, but so is short term corrosion rate of a tank floor. The next internal inspection and measurement of the tank floor is projected from those numbers. Problem with probable methodology is a level of confidence verses risk. A 100 percent measurement is best. A five year is typically associated with external inspection or in service inspection of tank.

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