First field and statistic report (1979 - 1998) about ultrasonic testing of gas cylinders. Gives a look into the different types of defects and compares the hydraulic testing with ultrasonic testing.

Pictures of cylinders with flaws respectively cracks in the transition area from the base to the cylindrical part of the cylinder.

Comprehensive report about the examination of base testing.

Overview of pictures showing flaws detected on steel and aluminium cylinders.