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The car battery idea is not so far fetched. When I was learning to use broco the demo video showed something just like that for striking the torch. It used a striker plate, I don't think there was even a switch, it seemed to be on all the time. One pole was connected to the gun, and the other to the striker plate. You just start the o2 and strike on the plate, then attack!!! Isn't broco fun!!! Just be carful using it where gas may collect above you or behind the target. A few divers have been killed when a pocket of oxygen and flamable gas exploded. One guy in Sydney wasn't killed, but he was very second hand afterwards. The workers compensation payout got him his own company. Also a pair of overalls may protect your suit a bit, it burns holes in your arms and shoulders as the sparks rain down on you. (even underwater) Also take the time to remove the marine growth. Broco will burn it away (it will burn *anything* away) but it is quicker and *much* cheaper to use hand tools to remove growth. Oh one other thing, keep all your metal gear out of the electrical path between the gun and the plate, it rots it away lickety split. (expensive) cheers Jason O-) > Re: The Big Wreck > > Congratulations to Mr Hadland for starting this thought-provoking discussion! > > Something someone said, about keeping this discussion in the realms of > 'technical' diving, reminded me a of question which I had been meaning to ask. > > We have experimented in using a BROCO gun (O2 thermic Lance) to liberate shiny > bits from wrecks, and ran into some problems with the ignition method. The gu n > has to be self-contained, not surface fed, so the usual electric arc method > of striking it is not possible. We have tried firing blanks in O2 streams, > but this is not hot enough to start the rods burning. Has anyone faced the sa me > type of problem, and if fo, how did they overcome it? > > One idea we had, was to take a car battery down, in a presurised box, with > a mercury switch to make and break the power as and when needed. Obviously, > the box would have to have it's own second_stage valve fitted to allow > pressure equalisation. > > Is there a method used in the commercial world which doesn't rely on a surface > supply of gas and power? > > Rgrds > Callum (trying to keep it technical) > > -- > Callum Beveridge International Computers Limited > Tel: +44 (0)1344 472958 Lovelace Road > Fax: +44 (0)1344 473246 Bracknell > Berkshire > Mail: cb@oa*.ic*.co*.uk* RG12 8SN > c.beveridge@br*.oa*.ic*.co*.uk* > > BSAC TRIMIX > ___________ > \O2 N2/ > \ / > \ / > \CO2/ > \ / > DIVER > > "Plan the dive, dive the wreck, wreck the plan..." > -- > Send mail for the `techdiver' mailing list to `techdiver@opal.com'. > Send subscription/archive requests to `techdiver-request@opal.com'.
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