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Ace, Things to think about: a) the 1/2" opening makes doing a VIP rather difficult b) a strap vise is required to remove the valve from the tank c) every time you remove and insert the valve you wear the threads d) they are dependent on the burst disk for over-pressurization as there is no o-ring to extrude Dave ----- Original Message ----- From: ANDREW MCALPINE <andrew_mcalpine@ba*.ne*> To: <techdiver@aquanaut.com> Sent: Sunday, July 02, 2000 1:53 AM Subject: Tapered threads and Pillar-Valves > List, > > I have a number of 25 + year old steel cylinders that have > tapered threads for the pillar valves. Is there any regulation > or empirical evidence to suggest that these are in any way > unsafe? Bearing in mind that the cylinders in question are in > test and that modern cylinders have parallel threads. > Grateful for any info :-) > > Ace. > > -- > Send mail for the `techdiver' mailing list to `techdiver@aquanaut.com'. > Send subscribe/unsubscribe requests to `techdiver-request@aquanaut.com'. > -- Send mail for the `techdiver' mailing list to `techdiver@aquanaut.com'. Send subscribe/unsubscribe requests to `techdiver-request@aquanaut.com'.
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