It's not the high pressure line you need to worry about.

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Posted by Chuck Tribolet on October 03, 2006 at 12:10:00:

In Reply to: Re: equipment maintenance posted by Kendall Raine on October 03, 2006 at 08:28:01:

If the spool breaks or the retaining nut comes off, the tank does not
empty really quickly. The HP port on modern first stages has
a tiny orfice, as does the HP hose. I ran an experment on this
several years ago -- I removed the HP hose from the first stage,
and cranked the valve open for a couple of minutes. Pressure
dropped about 100-200 PSI/minute, IIRC, with a full AL80.
And this was with just the oriface in first stage restricting flow,
it would have been even slower with the hose oriface in series.

It's the low pressure side you have to worry about. The next step
was to put the HP hose back on and remove an LP hose. That
caused a drop of several hundred PSI perm minute.

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