[PSUBS-MAILIST] Cornelius compressors

Sat Jun 11 23:06:51 EDT 2016

I've been looking through his patents, and Richard T. Cornelius seems to 
have been something of a genius. Many patents, and in many separate fields.

Marc

On 6/11/2016 7:19 PM, Alan James via Personal_Submersibles wrote:
> Thanks Antoine,
> some good information there. I am intending to have a constant
> flow system that is topped
> up via a re-breather style metering device. If the factory settings of
> the re-breather computer
> can't be changed then plan 2 is to use a PLC to do the work. This may be
> the better option
> as I could then have O2 level displays & alarms on one main HMI.
> As for the problem of remembering to turn the O2 on; I think I will have
> a switch under the pilots
> chair, activated by the weight of the pilot. This will activate an alarm
> or warning if the O2 valve isn't open.
> Alan
>
>
>
>
> ------------------------------------------------------------------------
> *From:* Antoine Delafargue via Personal_Submersibles
> <personal_submersibles at psubs.org>
> *To:* Personal Submersibles General Discussion
> <personal_submersibles at psubs.org>
> *Sent:* Saturday, June 11, 2016 6:09 PM
> *Subject:* [PSUBS-MAILIST] Cornelius compressors
>
> hi Alan
> You re right in a small cabin if Something is wrong in the oxy you have
> less time to react before o2 level drops too low or goes too high, so rb
> automatic systems can help and keep you alive if you fall unconscious.
> But:
> -one of the main failures rb systems are designed to address is much
> less present in subs:  o2 cells age fast at high oxygen partial
> pressures and fail to record high oxygen partial pressures which can
> trick into injection of too much oxy
> -oxy variations in rb are much larger than in a small 1atm sub
> -statistics of rb accidents tend to say that the automatic systems with
> solenoids are not safer than manual add systems. They might induce more
> complacency and have divers forgeting to check things. manual add on
> (like reabreather ´adv' system which can be also used to make a bellow
> add type ) systems coupled with constant flow (pediatric regulator) to
> cover minimal rate make you alert while giving you more time to
> react and perhaps decrease the chance you forget to turn o2 on which has
> been a cause of several rb deaths.
>  -it would be easy to use rb equipment in a sub, although some factory
> settings for O2 level alarms may have to be changed. But it is difficult
> to find spare parts if you do not own a unit and certification, other
> than on second hand market like cave diving forums. parts on rb
> accessory shops like tecme.de <http://tecme.de/> or golem are an option
> but can be expensive.
> The good thing with rb stuff though is their o2 cells have hydrophobic
> membranes for keeping condensed water away and give PpO2 on a large
> range or absolute pressure and O2.
> stand alone monitors like revo dream coming with HUD display could be good.
> Doing some rb diving course with the system you want to use can be
> very helpful... I did it with APdiving rb.
>
> Regards
> antoine
>
> On Saturday, June 11, 2016, Alan James via Personal_Submersibles
> <personal_submersibles at psubs.org> wrote:
>
>     Yes.
>     Cliff has a system that reads off one O2 sensor & seems to work
>     fine, but I
>     want the redundancy I will get with three O2 sensors as per a
>     rebreather. It is a bit
>     more complicated as if one O2 sensor is reading out of sync with the
>     other two
>     it will take the measurements from those two as Gospel. So I want
>     to use a
>     rebreather module that already has the algorithm for that.
>     The bellows add system relies on cabin pressure which can fluctuate for
>     reasons other than a variation in the O2 levels. And because my sub
>     is so small any
>     atmospheric conditions are going to fluctuate more quickly than a
>     larger sub,
>     hence the need for a reliable system that responds to changes quickly.
>     There is a bit of a blurb on the system AP developed for James
>     Cameron here.
>     James Cameron's Deepsea Challenge. Marianna Trench Trip Report Mar
>     2012
>     <http://www.apdiving.com/en/trip-report-apd-provide-the-life-support-for-james-camerons-deepest-dive-march-2012/>
>
>     	
>
>
>         James Cameron's Deepsea Challenge. Marianna Trench Trip Report
>         Mar 2012
>
>     	
>
>     <http://www.apdiving.com/en/trip-report-apd-provide-the-life-support-for-james-camerons-deepest-dive-march-2012/>
>     Cheers Alan
>
>
>
>
>     ------------------------------------------------------------------------
>     *From:* Al Secor via Personal_Submersibles
>     <personal_submersibles at psubs.org>
>     *To:* Personal Submersibles General Discussion
>     <personal_submersibles at psubs.org>
>     *Sent:* Saturday, June 11, 2016 12:28 PM
>     *Subject:* Re: [PSUBS-MAILIST] Cornelius compressors
>
>     Isn't that what people are basically doing already?  Whether you are
>     using a flow meter, needle valve, mpu controlled solenoid valve or
>     bellows add system ala Dr Phil, you are basically adding O2 at your
>     metabolic rate the same as a rebreather would do...
>
>     Al Secor
>
>     --------------------------------------------
>     On Fri, 6/10/16, Alan James via Personal_Submersibles
>     <personal_submersibles at psubs.org> wrote:
>
>     Subject: Re: [PSUBS-MAILIST] Cornelius compressors
>     To: "Personal Submersibles General Discussion"
>     <personal_submersibles at psubs.org>
>     Date: Friday, June 10, 2016, 6:34 PM
>
>     Thanks
>     Steve.How
>     easy would it be to adapt a rebreather O2 feed system to a
>     submarine?I
>     believe APdiving in the UK did this for James Cameron's
>     sub.I'm
>     building a one person sub about the size of Cliff's R300
>     & because of the small size,wanted
>     a system that responded quickly to O2 deviations.I
>     envisage the system as having a constant flow of O2 at a
>     rate just below my minimumconsumption,
>     with a top up from readings off 3 O2 sensors.Cheers
>     Alan
>
>
>       From: Stephen Fordyce
>     via Personal_Submersibles
>     <personal_submersibles at psubs.org>
>       To: Personal
>     Submersibles General Discussion
>     <personal_submersibles at psubs.org>
>
>     Sent: Friday,
>     June 10, 2016 4:26 PM
>       Subject:
>     [PSUBS-MAILIST] Cornelius compressors
>
>
>     Hi
>     all,I
>     know Hank uses a Cornelius compressor and I think others
>     have enquired after them.  In a nutshell, it's a
>     small/lightweight (~60lb?) high-pressure compressor no
>     longer made, originally used by the US Air Force in aircraft
>     - so it's pretty well spec'd.  Also by default
>     runs off nominal 27VDC - so highly suitable for install in
>     a PSUB, if you can handle the current draw, noise and 2cfm
>     flowrate.
>     Well
>     in the course of my business, I sold a SCUBA nitrox mixing
>     stick to a guy in Canada who mounted it on a Cornelius
>     compressor - see a picture of the final setup he sent me (if
>     the recent discussions of email vs Facebook haven't put
>     you
>     off!):https://www.facebook.com/tfmengineeringaust/photos/a.754931991306953.1073741830.754476911352461/858648047602013/?type=3&theater
>     Anyway, we
>     got to talking and he said he got the compressor from a
>     bloke in Florida.  I made contact and discovered this
>     bloke has a whole lot of them that he is slowly setting
>     up and selling as fully functional breathing air compressors
>     (they are old but apparently well preserved and have only a
>     few hours - he runs them in).  He also has parts as well
>     for anyone like Hank who already has a unit.  I'm
>     contemplating bringing a few into Australia to
>     on-sell.
>     In case
>     anyone is interested, his name is Paul Deverell, with email
>     pauldeverell at ymail.com
>     and phone number +1 786-367-3365
>     Cheers,Steve
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>
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