Manufacturer’s requirement for eddy-current testing of Luxfer cylinders manufactured from aluminium alloy 6351.


Do not use Luxfer Gas Cylinders (Luxfer) 6351-alloy SCUBA and SCBA cylinders that have not been both visually inspected and eddy-current tested.

Filling and testing stations in New Zealand must not fill Luxfer made from the aluminium alloy 6351 that have not been eddy-current tested. 


In 2004, Luxfer introduced a requirement to eddy- current test all Luxfer SCUBA and SCBA cylinders made from aluminium alloy 6351 in the periods and following countries:

  • Australia: 1975 through 1990

  • United States: 1972 through mid-1988

  • England: 1967 through 1995. 

Eddy-current testing

From AS 2337.1:2004 (Gas cylinder test stations Part 1: General requirements, inspection and tests – gas cylinders) section 7.1: ‘Any additional tests required by either the manufacturer or the design specification shall also be carried out’.

Luxfer has issued a manufacturer’s requirement for eddy-current testing on Luxfer SCUBA and SCBA cylinders manufactured from aluminium alloy 6351. This is therefore required by the standard for testing gas cylinders – AS 2337.1:2004. 

Actions for periodic testers

Anyone who undertakes periodic testing on SCUBA and SCBA cylinders manufactured from aluminium alloy 6351 must:

  • Conduct eddy-current testing in accordance with manufacturer’s instructions.

  • For cylinders that pass periodic testing, the cylinder test report must include whether testing has included eddy-current testing.

  • Where cracks are evident during testing, the cylinder must be condemned. 

What is eddy-current testing?

Eddy-current devices are tools to enhance visual inspections and improve the quality and accuracy of inspections.

Eddy-current testing does not eliminate the need for thorough visual inspection by trained and qualified periodic testers.

Note - The design approval has been withdrawn for cylinders made from aluminium alloy 6351, effective from 31 October 2017. See our alert for more information.

Any questions, contact or 0800 376 234.


Safety alert: Eddy-current testing of SCUBA and SCBA cylinders (PDF 39 KB)