Category: Scuba

In CGA pamphlet C-6.1, Standards for Visual Inspection of High Pressure Aluminum Compressed Gas Cylinders, it states in section 4.2 that cuts or digs are acceptable to the following limits:

    1. Unknown wall thickness, maximum dig = .031″ deep


    1. Known wall thickness, maximum dig = 15% of minimum design wall thickness.a) A dig in the sidewall could be:
      .471″ (min side wall) x .15% = .071″ deep

      b) A dig in the center of the base (the thinnest part of the base) could be:
      .735 (min base) x .15% = .110″ deep

      c) A dig in the radius and footring at the bottom of the cylinder could be:
      .110″ deep + .04″ footring height) = * .150″ deep
      * This dig cannot extend up into the sidewall.


  1. The length of the dig must be less than 6.0″