Calculating Dig in SCUBA Cylinder

Catalina Cylinders Logo
Technical Support Document

Calculation of an Acceptable Dig (Gouge)
in a S80 SCUBA Cylinder
(per CGA Pamphlet C-6.1)

August 8, 2000

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:

Unknown wall thickness, maximum dig = .031" deep

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.

The length of the dig must be less than 6.0".

Catalina Cylinders - West
Corporate Headquarters
7300 Anaconda Avenue
Garden Grove, California 92841 USA
Phone: (714) 890-0999
Fax: (714) 890-1744

Catalina Cylinders - East
Cliff Impact Division
2400 Aluminum Avenue
Hampton, Virginia 23661 USA
Phone: (757) 896-9100
Fax: (757) 896-9143

[Home] [About Us] [Products] [What's New] [Technical Support]