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Re: [!! SPAM] Re: [PSUBS-MAILIST] PSUB Rescue Efforts Proposal
I have used both pillow bags, open and closed circuit standard
"teardrop" bags, and special purpose bags for vehicle recovery, etc.,
and have never seen a tire valve used. The closest thing - a Schrader
valve on a closed-circuit lift bag intended for the recreational diving
market, used a fitting identical to a SCUBA buoyancy compensator or
drysuit inflator connection, only without the locking feature. The
difficulty with any of these things is that the restriction is so small
that they inevitably ice up if used continuously for longer than a few
seconds. I can only see this problem being worse in fresh water.
-Sean
Dan. H. wrote:
Jay and others,
I'm mainly a lake diver where the first to respond to me would most
likely be a dive rescue team, not the coast guard of navy. For that
reason I haven't ruled out the Schrader type tie stem valve.
The dive rescue teams here work closely with the fire and rescue
people. Most, if not all, dive rescue teams are actually connected
with fire and rescue. The fire and rescue folks use heavy pillow type
air bags for lifting heavy objects and the dive rescue uses balloon
type lift bags for lifting in water. They both use "tire stem type"
connecters. Our dive rescue divers are all equipped with a hose for
discharging pressurized air to fill these bags. I'll ask around to
determine in how wide of an area this is standard. I'm guessing it's
VERY standard since that type of TIRE stem connection is the same
world wide. Maybe there will need to be more then one standard,
depending on the waters your diving in.
When I go out with my sub, I always have a tool box that stays with
the surface guys. That's where I keep adapters, instructions
and things for emergencies. In most cases, it's your own surface
support that will be getting the help for you and they should
have anything that's needed.
For a sub stuck on the bottom, bleeding down built up pressure in a
hull is far harder then injecting in air. To avoid over pressure on
the way up, the hatch could be unlatched and let the pressure burp out
when the sub rises enough, but as Jay points out, it would have to be
a controlled assent. If lift bags were used, the assent could be
controlled by the length of the rope that attaches the bags. For my
sub, my surface support knows that my hatch viewport can be loosened
to vent or unbolted to gain access.
What it comes down to is, most of how a rescue would go will be
determines by how well the rescuers know your sub and how well they do
what is needed. For lake divers like myself, the best protection is
the information and things you have in your topside tool kit.
Most fresh water dive rescue people have never seen a Psub and don't
know first thing about one. Unfortunately, the best qualified rescue
person for any particular sub, is most likely the person trapped inside.
Jay, I'll get back with you in a few days about what I find as
standards here in fresh water. I'll contact the rescue teams in the
areas I dive.
Dan H.
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