Hello Tim, They have a porous plug at the top of the cylinder to contain the acetylene. But no complete liner to my knowledge, the books I have are old though so things may have changed. In one respect for sure cylinders have changed, the old cylinders used to have a safety valve at the base, but mine hasn't, I think they are incorporated in the valve at the top these days.
In case anyone is interested: (taken from Welding by S M Algar pub 1962 An Arco Handybook) Also confirmed in The BOC Handbook for Oxy Acetylene Welders pub 1943) Acetylene cannot be compressed safely above 30 - 40 lb/sq in. Above this pressure it decomposes & often explodes. British law prevents it being compressed higher than 22 lb/sq in. Then it was discovered acetone at atmospheric pressure will dissolve 25 times its own volume of acetylene & 375 times its volume at 15 atmospheres. The packing material within the cylinder can be charcoal, balsa wood, kapok or special porous cements (I presume nowadays that means ceramic fibre wadding) The purpose of the filler material is to effectively reduce the volume into smaller pockets to help prevent an explosion wave from forming. All this enables acetylene cylinders to be filled to 225 - 250 lb/sq in. (15 - 16 atmospheres) Cylinders should be stored upright. Laying them on their side or in the sun can result in a fountain of acetone coming from the valve rather than the desired acetylene. Regards Malcolm ----Original Message----- From: [EMAIL PROTECTED] [mailto:[EMAIL PROTECTED] On Behalf Of Tim Ferguson Sent: 08 April 2005 15:24 To: [EMAIL PROTECTED] Subject: RE: [Biofuel] 2 - Mother Earth News burners and glycerine by-product Malcom, If memory serves me correctly...acetylene tanks are also made with a somewhat porous inner wall to aid in containing the acetone. Am I correct on this? Best wishes, Tim _______________________________________________ Biofuel mailing list [EMAIL PROTECTED] http://wwia.org/mailman/listinfo/biofuel Biofuel at Journey to Forever: http://journeytoforever.org/biofuel.html Biofuel archives at Infoarchive.net (searchable): http://infoarchive.net/sgroup/biofuel/
