[PSUBS-MAILIST] bellows add

[Alan James via Personal_Submersibles]

I agree Hank,I think you should email Phil & warn him:)I have thought that if there was an air leak in to the cabin the bellows add systemwould stop adding O2. They have a manual system integrated into the bellows addunit & a continual feed of O2 regardless of the belows. They would have O2 monitorswith set point alarms if the O2 % was too high or low but how they would address analarm issue I don't know.I like Cliff's method of having a set volume flowing in (as per DW) & O2 addition generatedby O2 measurements opening an O2 solenoid valve via a PLC. This is similar to arebreather & James Cameron's system on the Deepsea Challenger.Don't get me going on the coffee issue. I buy green beans & roast them. Would growthem if we had the climate. My side of Auckland had power. Hugh lives on the Dark side.Alan

      From: hank pronk via Personal_Submersibles <personal_submersibles at psubs.org>
 To: personal_submersibles at psubs.org 
 Sent: Tuesday, October 7, 2014 10:07 AM
 Subject: [PSUBS-MAILIST] bellows add
   
I have been pondering the idea of a bellows add system for Gamma.  I am not sure how the DW deals with pressure change due to temperature change.  When I am diving Gamma the temperature swing is huge causing a big negative pressure inside.  A bellows add system would be dumping O2 in like mad.  Does the DW have an automatic O2 over ride or an automatic air release to compensate. Does the pilot manually add air to avoid O2 build up.
When I surface after a dive without the scrubber or O2 feeding in, I have to open my hatch vent valve for what seems like forever to equalize the sub to open the hatch.  It is getting better with the air temps dropping.  I can't wait to go for a dive when it is snowing. 
Hank
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