[PSUBS-MAILIST] Cornelius compressors

[Alan James via Personal_Submersibles]

Yes.Cliff has a system that reads off one O2 sensor & seems to work fine, but Iwant the redundancy I will get with three O2 sensors as per a rebreather. It is a bitmore complicated as if one O2 sensor is reading out of sync with the other twoit 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 anyatmospheric 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
  
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James Cameron's Deepsea Challenge. Marianna Trench Trip Report Mar 2012
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 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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