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Thanks Phil.
I have a ton of questions to ask you about this,
but my head is swimming from the oil filled battery pod discussions and
posts.
It seems the more I learn about subs and their
requirements, the more I realize I have just sighted the tip of the iceburg. Now
I realize what Vance was
trying to tell me. Apologies again to Vance.
In spite of all I have learned, all the research I
have done, all the sites I have visited and message boards I have scoured over
literally months
of reading, things are always more complicated than
they appear and the more I learn, the more I realize how much I still do not
know. It gets very frustrating sometimes.
I will get back with you Phil by tomorrow or
hopefully within the next few days with my questions about this. Since air
equalization is my choice for compensation,
(at least I thought it was, now I'm not so
sure) I really need to understand fully
everything you are telling me. Thanks again.
Kindest Regards,
Bill Akins.
----- Original Message -----
Sent: Sunday, January 30, 2005 5:24
PM
Subject: Re: [PSUBS-MAILIST] For Bill A.,
recharging battery pods, Vacuums and unknown gas loss.
Dear Bill:
Regarding battery pod vacuum: We ( Nuytco) don't use Hydro-caps on
our
current sub battery pods. We did use them for many years on several
early
subs such as Sea-Otter, Sea-Urchin, and various
stand-alone
manip/jet-pump/ cutting systems/etc., with their
own,independant, power
supply. As Vance says, we most often had a
vacuum on surfacing. So, if you
must use caps, plan on a
vacuum..
Of far greater concern,
safety-wise and IMHO, is your proposed use
of a scuba reg for pod
compensation. No matter how you cut it, by
definition, at some point in the
system you have nothing between the
interior of your pod and the water but
1/32nd of an inch of rubber. If you
forget to turn on your comp air and
descend, or comp airline is blocked, or
comp air is exhausted and you dont
realize it and go deeper - the pods will
flood and you will go deeper mucho
rapido or,and, when you hit bottom, you
will be stuck there like a limpet!
Don't use a standard scuba reg with with
an unmodified diaphragm and/or
diaphragm retainer - or a mushroom or
flutter-valve exhaust. Do use a
positive pressure reg and
positive-over-ambient pressure exhaust, so that
any leaks are gas out, not
water in. Do also provide pod water alarms and
the usual pod sensors,
ground-fault indicators, breakers, etc. Overkill?
Think about flooded pods
or flooded significant volumer external housings
dragging you down . . .
not a pleasant thought!
Regards
Phil Nuytten
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