Welding and testing
Welding and testing
(OP)
I have a 50 litre seamless gas cylinder with a 200 bar working pressure. I wish to cut a hole approx 50mm in the side midway along the cylinder and weld in a weld type fitting giving me a thread to connect too. I want to convert this to a buffer tank with a max pressure of 60 bar the gas medium will be a helium/oxygen mix. Would this be possible to weld and be safe at 60 bar? A 1.5 hydrostatic test and MPI what would be the best way to go with this concept? Weld procedure etc.
Satsystem
Satsystem





RE: Welding and testing
Do not attempt to perform this activity on your own.
RE: Welding and testing
I understand what you are saying its still acting as a pressure vessel.
I have done it before on a 200 bar 12 litre cylinder but cut into the orginal neck and welded a 1-1/2" NPT connection but the big differance it was only a buffer for 3 psi!
Its the 60 bar that concerns me.
Satsystem
RE: Welding and testing
RE: Welding and testing
ASME-PVHO Code.
RE: Welding and testing
50ltr flask a bit small for a human?
All though I know the PVHO code.
It must Have been my name or oxy/Helium that brought you to that conclusion.
To put you more in the picture its a modification with a series of pressure reducing regulators for oxy/helium gas to get the pressure down to enter a HP gas compressor, for gas transfer. I want to fit a buffer bottle between an HP reducing regulator and an LP reducing regulator.
Satsystem
RE: Welding and testing
RE: Welding and testing
DOT references ASME Section VIII, Div 1 Code of Construction.
RE: Welding and testing
RE: Welding and testing
I was thinking of the requirements in ASME PVHO pertaining to piping systems for breathing air. Since you are familiar with the Code you have no doubt considered those if they're applicable in your case.