home *** CD-ROM | disk | FTP | other *** search
- Path: sparky!uunet!zaphod.mps.ohio-state.edu!magnus.acs.ohio-state.edu!usenet.ins.cwru.edu!cleveland.Freenet.Edu!cf036
- From: cf036@cleveland.Freenet.Edu (G. Gary Preckshot)
- Newsgroups: rec.crafts.metalworking
- Subject: Re: want to drill and thread holes
- Date: 25 Jan 1993 01:23:00 GMT
- Organization: Case Western Reserve University, Cleveland, Ohio (USA)
- Lines: 22
- Message-ID: <1jvfdkINN3kb@usenet.INS.CWRU.Edu>
- NNTP-Posting-Host: slc10.ins.cwru.edu
-
-
- Phil's comments about refillable bottles and acetylene may
- unintentially lead someone into a very dangerous situation.
- What many people don't know is that acetylene does not need
- oxygen to explode. If the mean free path inside a pressurized
- acetylene container exceeds a certain distance (dependent
- upon pressure), acetylene will spontaneously decompose, with
- liberation of lots of energy (Bang!). This caused chemical
- explosions (unexpected) in early German plastics plants until
- they learned to fill large bore acetylene piping with small
- diameter tubes to limit molecular mean free path before walls
- were encountered.
-
- Modern acetylene tanks have acetone-soaked fiber inside and
- the gas is dissolved in the acetone. The solution mechanism
- acts like the free space Phil talks about in propane 2
- phase cylinders. However, it is extremely dangerous to treat
- acetylene like propane. It should be stored only in specifically
- designed acetylene cylinders and probably only by
- professionals who know what they are doing.
-
- G.
-