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Simon
>One thing that wasn't covered (because this really only matters to a rec
>diver (single tank) like me), how would an Apeks US-4 handle supplying two
>second stages at depth (with high air consumption). In a DIR tech setup
>there is only one second stage per post (often working at greater depths
>obviously). I'm sure a couple of divers in a stressful situation could
>suck a lot of air in 20-30 metres (maybe more than a single experienced
>diver a lot deeper, even working hard). Any experience?
The Apeks regulators are rated to 50+ meters - as are most these days - and
test well against the competition. However we can't be talking of a huge
depth if we're considering a single cylinder dive. Also, Helium in the gas
makes breathing easier and more importantly gives the divers a better chance
of surviving and probably avoiding the issue altogether.
Some time back, Diver Magazine in the UK did a test at 50m breathing air from
4 second stages attached to a single first stage in order to assess
performance. In general, most regulators performed OK. I don't have a copy
of this issue anymore. Personally, I would not be concerned but if I was I'd
check it out underwater with my buddy.
David Shimell
shimell@se*.co* <mailto:shimell@se*.co*>
DDI: 01932 814096 * Mobile: 07770 282 202 * Fax: 01932 814343
Project Manager, IBM UK Web Server Group, Sequent Computer Systems Ltd,
Weybridge Business Park, Addlestone Road, Weybridge, Surrey, KT15 2UF, UK
registered in England and Wales under company number: 1999363, registered
office as above
-----Original Message-----
From: Simon L Hartley [SMTP:shartley@sc*.ed*.au*]
Sent: Friday, June 02, 2000 9:16 AM
To: techdiver@aquanaut.com
Subject: Single tank reg question (was RE: 2nd stages)
Hi all,
I've been following the Apeks threads with interest. Posted a question
last week but by the time I got the "Message approval" response the thread
had moved on and most of my questions answered.
One thing that wasn't covered (because this really only matters to a rec
diver (single tank) like me), how would an Apeks US-4 handle supplying two
second stages at depth (with high air consumption). In a DIR tech setup
there is only one second stage per post (often working at greater depths
obviously). I'm sure a couple of divers in a stressful situation could
suck a lot of air in 20-30 metres (maybe more than a single experienced
diver a lot deeper, even working hard). Any experience?
I've looked at going over to a diaphragm style reg for a while. My current
piston first stage (MK10) is quite high maintenance (three services per
year) with the sort of diving I do. The Apeks appeals because of the
simpler design (other firsts I've looked at look quite fiddly (not at all
easy to service and lot to go wrong)).
H/Y valves are undesirable. I like to keep things as simple as possible.
At 20:07 1/06/2000 -0500, s_lindblom@co*.co* (Steve Lindblom) wrote:
>separate effort adjustments, which allow detuning. Cheaper ones like the SP
>190/380 aren't balanced, are less sensitive, and can also be detuned even
>further if desired. It's the ones in the middle that give the trouble.
So the old R190's are unbalanced. Wondered what everyone was complaining
about ("free flows, what free flows?") :-)
Simon
Simon L Hartley
RSM Unit Web Administrator\First Year Course Coordinator
Associate Lecturer
School of Resource Science and Management
Southern Cross University
P.O. Box 157
Lismore NSW, Australia 2480
Ph: (02) 66203251 or (61 66) 203 251
Fax:(02) 66212669
E-mail: shartley@sc*.ed*.au*
http://www.scu.edu.au/staff_pages/shartley/index.html
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