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Not a stupid question at all. Increasing the gas demand on any pressurized source results in an increase in cooling when the gas expands. Even having two people breathe off the same first stage increases the hazard. It isn't much of an issue above about 45F and pretty nearly impossible above about 50F. CO2 is far more dramatic since the CO2 is in liquid form and there is a huge amount of latent heat absorbed as the liquid boils. Don ----- Original Message ----- From: Brad, Jen, and Sam <bjs539@ho*.co*> To: <techdiver@aquanaut.com> Sent: 22 June, 2001 19:21 Subject: Re: Left Post Knob - Reverse Thread ? > This is going ot be a stupid question, but since I don't know the answer I'm > going to ask. Would a failure of this type at depth increase the chances of > your first stage 'freezing up'? I've never seen this happen, but I have seen > compressed CO2 tanks blow out valves, and the frost forms rather quickly. > Not sure if the same would happen with nitrox/trimix/quadmix/etc. Thanks! > > Brad > > ----- Original Message ----- > From: "Paul Braunbehrens" <Bakalite@ba*.co*> > To: "Rodriguez" <mikey@ma*.co*>; "David Pearson" > <djpearson@sy*.ca*> > Cc: <techdiver@aquanaut.com> > Sent: Friday, June 22, 2001 4:15 PM > Subject: RE: Left Post Knob - Reverse Thread ? > > > > The rate at which the HP port expels gas does not increase with > > depth. You are thinking of LP ports, which will expel more gas at > > depth because they are balanced to the surrounding pressure. The HP > > port is not balanced to anything, and you'd still loose gas at about > > the same rate. > > > > > > > > Rodriguez wrote: > > ~ > > >At 12:18 AM 6/22/2001 -0400, David Pearson wrote: > > > > > >Hello David, > > > > > >>day and turned on the tank to see what would happen. At a starting > pressure > > >>of 3000PSI on an AL63 I left the valve full open for 1 minute. When I > > >>checked the pressure after, it had only dropped 400PSI. > > > > > >At 330 feet (10 AtA more than at the surface), that same test would > > >drain ~4000 PSI in one minute. The small fixed orifice of the high > > >pressure port helps mitigate the severity of the problem, but at > > >300+ feet, any blown hose is a *very* big deal. > > > > > >-Mike Rodriguez > > ><mikey@mi*.ne*> > > >http://www.mikey.net/scuba > > >Pn(x) = (1/(2^n)n!)[d/dx]^n(x^2 - 1)^n > > > > > >-- > > >Send mail for the `techdiver' mailing list to `techdiver@aquanaut.com'. > > >Send subscribe/unsubscribe requests to `techdiver-request@aquanaut.com'. > > > > > > -- > > Paul B. > > -- > > 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'. > NetZero Platinum No Banner Ads and Unlimited Access Sign Up Today - Only $9.95 per month! http://www.netzero.net -- Send mail for the `techdiver' mailing list to `techdiver@aquanaut.com'. Send subscribe/unsubscribe requests to `techdiver-request@aquanaut.com'.
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