This standard provides cylinder users (requalifiers, owners,
fillers, operators, etc.) with criteria to accept, reject, and
condemn steel compressed gas cylinders. This standard does not
cover all circumstances for each individual cylinder type and
condition of lading.
NOTE—Special permit cylinders may contain their own visual
inspection criteria in the special permit.
In situations where a particular cylinder design type is not
covered by this standard, users shall modify their inspection
procedures. If a particular compressed gas service has unique
detrimental effects on a cylinder's internal or external condition,
these shall also be considered by the user.
Experience in the inspection of cylinders is an important factor
in determining the acceptability of a given cylinder for continued
service. Users lacking this experience who have questionable
cylinders should return them to a manufacturer of the same type of
cylinders or to a competent requalification agency for
Suggestions contained in this standard do not apply to cylinders
manufactured under specification DOT-3HT, CTC-3HT, or TC-3HTM.
Because of the special provisions of that specification, separate
recommendations covering service life and standards for visual
inspection of these cylinders are contained in CGA C-8, Standard
for Requalification of DOT-3HT, CTC-3HT, and TC-3HTM Seamless Steel
Cylinders . For cylinders manufactured under specification
DOT-8, DOT-8AL, CTC-8, CTC-8AL, CTC-8WC, TC-8WM, or TC-8WAM, see
CGA C-13, Guidelines for Periodic Visual Inspection and
Requalification of Acetylene Cylinders . For aluminum alloy
cylinders, see CGA C-6.1, Standard for Visual Inspection of High
Pressure Aluminum Alloy Compressed Gas Cylinders; CGA C-6.2,
Standard for Visual Inspection and Requalification of Fiber
Reinforced High Pressure Cylinders; and CGA C-6.3, Standard for
Visual Inspection of Low Pressure Aluminum Alloy Compressed Gas
Cylinders [5, 6, 7].
Inspection procedures include preparation of cylinders for
inspection, exterior inspection, interior inspection (if required),
nature and extent of damage to be looked for, and some tests that
indicate the conditions of the cylinder, etc. A sample inspection
report is shown in Appendix A that may be revised to suit the