Brass Alloy for Pressurized Cylinders
Brass Alloy for Pressurized Cylinders
(OP)
Gentleman and Ladies. I am not a professional to your degree but need some direction. I only put Marine/Ocean as my profession because I don't fit into another category. I am a Firefighter/Paramedic by profession. I am overseas trying to have a valve made for both SCUBA cylinders and home use oxygen cylinders. I believe that brass has a small percentage of lead in the alloy. Can someone advise me or point me in the direction where I could find out if cylinder valves for breathing air (SCUBA) and oxygen are required to be lead free. Also, any other areas of direction you could point me in to find out about DOT approval, etc. Thanks so much. Bob Nelligan





RE: Brass Alloy for Pressurized Cylinders
I would NOT make any attempt at reverse engineering or designing a replacement valve. Visit the web site below
http://www.cganet.com/Publication.asp
I would order a replacement valve from a reputable source that deals with SCUBA or SCBA tanks. Do NOT take any chances on trying to save money or purchasing a valve that is not suitable for SCUBA or SCBA tanks.
RE: Brass Alloy for Pressurized Cylinders
RE: Brass Alloy for Pressurized Cylinders
The most common screw machine alloy, Free Cutting Brass, alloy 360, or 36000, does have lead, about 6 pct if memory serves.
I was once involved in purchase of brass extrusions from a NAFTA source, allegedly of that alloy, supplied with certs. During investigation of an unrelated problem, our parts were analyzed at 16 to 22 pct lead. At least they weren't radioactive.
I can't answer your question about whether leaded metal is or is not allowed in scba or oxygen service.
Mike Halloran
Pembroke Pines, FL, USA
RE: Brass Alloy for Pressurized Cylinders
I would contact the USP org and to see what the requirements for O2 and Air are.
Good luck with the the CFR's.
I would also take a look at different valve suppliers and see id they mention any regulations. I think all cylinder valves have to meet a Cylinder Gas Association regulation.