Websites re exploding scuba cylinders

Re scuba cylinders made from 6351 alloy , the Luxfer website found at http://www.luxfercylinders.com/support/faq/sustainedloadcracking-australia.shtml discusses FAQs re Sustained-load Cracking for Cylinders in Australia and New Zealand . The Queensland government websote found at http://www.deir.qld.gov.au/workplace/publications/alerts/alloy_cylinders/index.htm is an alert to inform people who fill aluminium alloy cylinders of the risks of death and injury from cylinder explosion. The website found at http://biobug.org/scuba/scubatank/ may be of some interest, despite being American. Many thanks to Neville Skinner for these details.