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Hi Egil,
I don't know about George but I thiink he will be inline with me on this =
one: You should not use swivels of any kind on your primary and =
secondary air supply sources. Keep it simple is the principle. If you do =
not absolutey need it, do not add another possible failure point in the =
air supply chain. A swivel at the very least adds two more 'O' rings and =
reduces air supply volume. The second point may not be readily apparent =
at the surface, but at 150+ it can be very apparent! One the first point =
some swivels are absolutly dangerous. My advice 'Don't use 'em'. The =
danger far out weighs the benefit.
Dan
----------
From: Egil Aabel Naesguthe[SMTP:egil@me*.qu*.ca*]
Sent: Friday, November 15, 1996 11:19 AM
To: Helen Johnstone
Cc: George Irvine; Donald B. MacKay; 'TechDiver'
Subject: RE: What hoses with a Full Face Mask?
George says:
> .I also agree with using the short hose to feed the mask in your
> sitiuation, since the long hose must be ready to do anything, =
including
> replace the short hose. Clipped off on the right shoulder d-ring is =
the
> spot.
Helen says:
> If you have the short hose to the FFM coming in from the left, and the =
long
> hose coming in from the right (across the chest, around the left side =
of
> your neck and looped around the back of your neck to the right =
shoulder),
> wouldn't there be a problem in quickly donating the long hose? =
Wouldn't you
> have to put the long hose under the short hose (on the left side of =
your
> neck) in order that it didn't catch the short hose? If so, wouldn't =
the
> short hose stop the long hose being deployed over the head (as in your =
video).
I'm thinking now that this is where an elbow by the second stage is =
useful
again. If the hose from the FFM regulator is pointed down so that it =
hits
the front of the shoulder instead of coming straight out to the side =
(left
or right), the clipped off long hose can rest on top of the short hose =
and
is now free to be deployed as usual. Does this make sense?
Egil.
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Egil Aabel Naesguthe
Queen's University E-mail: egil@me*.qu*.ca*
Dept. of Mechanical Engineering
Kingston, ON Phone: +1 613-545 6730
K7L 3N6
Canada Fax: +1 613-545 6489
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--
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