Greg, you are just playing with dice as to when these devices will fail.  Look
at the stats, and 
ask anyone who has been stupid enough to use them under ice how often they
freeflow.  Weigh the 
benefit versus risk.  Positive pressure contamination protection or voice comms
for commercial and 
SAR work justify their use for SOME objectives.  Keeping my upper lip warm
during a dive is not a 
mission critical justification for the additional risk involved.  As to using
them deep, there is 
no excuse for this kind of unnecessary CF, and if you have a problem with ease
of breathing the 
solution is using the right gear in the first place.  The Poseidons are a good
cold water first 
stage, however I also have to question your failure mode analysis, as all of
the first stage 
failures I have witnessed are freezes caused by a freeflowing second.

-Sean


On Wed, 14 Jan 1998 17:34:10 -0500, Greg Zambeck wrote:

>The full face is used because of it's warmth, and past performance under
>the ice, comfort and ease of breathing.  First stages are the common cause
>of failures due to construction and Freeze protection.  Poseidon's seem to
>work the best from my past experience. 
>
>----------
>> From: Sean T. Stevenson <ststev@un*.co*>
>> To: techdiver@aquanaut.com; Greg Zambeck <gzambeck@us*.ne*>
>> Subject: Re: ice diving
>> Date: Tuesday, January 13, 1998 1:11 AM
>> 
>> On Tue, 13 Jan 1998 16:03:28 -0500, Greg Zambeck wrote:
>> 
>> >Sean
>> >
>> >I've been using a full face AGA with dual regulators for 15 years and
>have
>> >yet to have a free flow.
>> >We make air dive to 200 and Trimix to 300 without a problem.  The
>biggest
>> >hazard is the first stage.
>> >
>> >Greg Z.
>> 
>> So, if I understand you correctly, you dive under ice, using FFM's
>without a clearly defined need 
>> for them, you dive on air to 200 feet, and you use the FFM's deep. 
>Forgive me but from this 
>> information it would seem that the biggest hazard has, in fact,
>absolutely nothing to do with the 
>> first stage.
>> 
>> -Sean
>> 
>> 
>


--
Send mail for the `techdiver' mailing list to `techdiver@aquanaut.com'.
Send subscribe/unsubscribe requests to `techdiver-request@aquanaut.com'.

Navigate by Author: [Previous] [Next] [Author Search Index]
Navigate by Subject: [Previous] [Next] [Subject Search Index]

[Send Reply] [Send Message with New Topic]

[Search Selection] [Mailing List Home] [Home]