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Brent,
Does your sub have the snorkel on it? Most K subs
built by Kittredge did.
When I surface I open the valve to the snorkel and
equalize the pressure. It's almost always negative in the sub because of
the temperature difference of the air I left the surface with and the internal
temp of what I'm returning with. When I dive in New York States Finger
lakes, the water temp isn't much over forty degrees all year
around. At the end of a summer time dive in there, I vent
to equalize and have to swallow to clear my ears because they pop so
much when I surface and vent. It's difficult to open the hatch if I don't
first vent.
If you were positive pressurized from a problem, your
snorkel should release it. The barometer is a good idea but you shouldn't
need any extra piping if you have the snorkel.
Dan H.
----- Original Message -----
Sent: Wednesday, June 24, 2009 11:24
PM
Subject: RE: [PSUBS-MAILIST] Over
Pressure Valve Options
Hi
Alec,
I very much like the idea of using a barometer to see if there
is any pressure build up in the cabin and as part of the O2 dosing
system. A pesky leak is what got Kittredge. When he was at depth
it wouldn't of bled out of a small or large over pressure valve/pop off
valve, until the pressure was over the pressure at the outlet of the over
pressure valve and able to over come what ever the spring pressure is on the
valve(s).
So when he
decided to pop to the surface quickly, a small over pressure valve likely
wouldn't able to let enough air out fast enough.
Regards,
Szybowski
Subject: RE: [PSUBS-MAILIST] Side Thruster Options
Date: Mon, 15 Jun 2009
16:14:52 -0400
From: Alec.Smyth@compuware.com
To:
personal_submersibles@psubs.org
Simple solution... just put a T in your pressure gauge line, and
a little check valve of the kind that's a SS ball seated by a spring. You can
get them for maybe 10 bucks on eBay and they work like a charm. I know, a
small instrumentation line isn't large enough to relieve huge
volumes of air. But what you're contending with is pesky little small
leaks that go unnoticed. Also, install a barometer in the
sub.
Hello
Alec,
Your reminded me of one reason I didn't wish to go with
air compensated thrusters. It was a slow bleed into the interior of a K-250
that George was running, that made the hatch dome pop out when he started to
ascend, and he was lucky to of survived. This is also why I plan to install a
over pressure valve much like the larger one that is installed on the
KSS. Except I'll be mounting mine in the bottom of the sub so it can
also be used to drain the sub after a wet exit training exercise.
Regards,
Szybowski
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