Also what is 'Mapp Gas'?
extract from
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"MAPPMAPP gas which is a mixture of various hydrocarbons, principally, methylacetylene and propadienne, produces a relatively hot flame (2927°C). However, the lower calorific value of the inner cone compared with acetylene gives a slightly slower pierce time. The gas is seen as an alternative to acetylene with greater tolerance to torch distance variation because of the more uniformly distributed heat between the inner and the outer cones.
Only acetylene, hydrogen and MAPP have sufficiently high flame temperature for underwater cutting. But as acetylene has a limited outlet pressure, MAPP is the only gas other than hydrogen that can be used for cutting in deep water."
Never used it, but seems popular with many. If I solder (rather than pushfit) my impending CH, it looks worth investigating
Interested to hear about the Javac torch.
Jono
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