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Interesting. According to most accounts, the plus sign was a wartime stopgap conceived of in 1942 as a way of increasing tank capacity, and kept on afterwards when no problems were found running the tanks at the higher pressure. So those 1929-1941 hydros are interesting anachronisms, to say the least. Re plus ratings in general, there are, best I can tell, three kinds of dive/hydro shops: shops that don't understand the plus rating and will tell you flatly they don't do it, shops that don't understand it but pretend they do, and shops that understand it and do it all the time. The middle are, pretty obviously, the most dangerous as they'll say things like "We'll do it if we can" or "We'll try" then the tanks will come back without the plus and they'll mumble something about "we checked and the regs don't allow it". Shops that do it routinely are usually pretty no-nonesens and straightforward about it when one asks, any slight hesitation or prevarication on their part and its best to go elsewhere. Another good test is that most shops will have some tanks istting around that have been hydroed and are waiting to be picked up at the shop, if none of them have the plus its a bad sign. >Al is quite correct. I just got 4 LP95's and an K helium bottle back from >hydro yesterday and all plus rated. The K bottle's manufacturer hydro is >February of 1924 and it has been plus rated every hydro since then! -- Send mail for the `techdiver' mailing list to `techdiver@aquanaut.com'. Send subscribe/unsubscribe requests to `techdiver-request@aquanaut.com'.
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