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>>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. It seems things are never as simple as they seem. It turns out that: "When gas flows from a vessel through an orifice to another vessel, it is well known that as the downstream pressure is reduced, the mass flowrate steadily increases until the velocity at the orifice reaches sonic velocity. If the downstream pressure is further reduced, the mass flow is unaffected and the excess pressure is dissipated in shock waves downstream of the orifice." Take a look at: http://www.optimal-systems.demon.co.uk/appendix-e.htm and http://www.optimal-systems.demon.co.uk/sonic-velocity.htm -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'.
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