[PSUBS-MAILIST] scrubber

Tue Nov 1 21:39:40 EDT 2016

Hi, Hank,
Just got in from a three day video shoot offshore Vancouver – Unpacking my dive gear and gonna hit the sack early – everything’s tired!
Will get back to you on the scrubber fan size and make.
Phil

From: hank pronk via Personal_Submersibles 
Sent: Tuesday, November 01, 2016 3:09 PM
To: Personal Submersibles General Discussion 
Subject: Re: [PSUBS-MAILIST] scrubber

Thanks Cliff,
I have the same question, but after thinking about it today, I realize that the shape of the container is irrelevant.  I can treat it like a round scrubber with a fan at the end with an air space between the fan and absorbent bed.  I am just not sure if it is axial because the scrubber seems to be a mesh body.  I also did not pay much attention on my tour, I was a bit overwhelmed.
Hank

On Tuesday, November 1, 2016 2:13 PM, Cliff Redus via Personal_Submersibles <personal_submersibles at psubs.org> wrote:

Hank, don’t know all the detail on the Deepworker 2000 but will convey what I know.  Maybe Phil will chime in with details.
The system uses his O2 bellow add valve which bleeds 100% O2 into the cabin based on a drop in barometric pressure from the time the hatch was closed.  At the time of launch SOP calls for them to pull a slight vacuum in the boat to assure the hatch o-ring is sealed and to make it easier to dog the hatch latches.  The last spec I saw on the DW 2000, the endurance is 80 hours. There are two scrubbers (one redundant), each containing 12 lbs of SodaSorb HP. There is also a BIBS system.  They have O2 and CO2 monitors.  The O2 bottles are externally mounted.  Since his life support endurance is 80 hours, I he should have in excess of 80 scf of O2.  I don’t know how the Sodasorb is set up to filter, axial or radially nor do I know the type of blower he is using in the scrubbers.  As long as the blower on the scrubber is strong enough to circulate the cabin air through the filter every hour or so, the 100% O2 that is blead into the cabin will mix with the cabin air due to molecular diffusion.
I believe he uses the same basic life support system on all his boats.  
Phil’s paper on Life support http://www.psubs.org/design/lifesupport/lifesupport.pdf is a good read on how his bellows add system work and life support in general.
When Phil let the PSub members dive his subs at the Vancouver PSub Convention, I remember seeing the scrubbers and noting they were compact but I was more focused on diving the DW 2000 so did not pay too much attention to the scrubber design.  
The two key things I would like to know is what is the make and model of the blower he uses and is the filter oriented to pull the cabin air radially or axially through the Sodasorb HP.

Cliff

On Tue, Nov 1, 2016 at 7:13 AM, hank pronk via Personal_Submersibles <personal_submersibles at psubs.org> wrote:

  Hi All,
  Can anyone explain how the DW scrubber works?  How  is the air defused equally when the shape is irregular.   I want to copy the concept of a scrubber that fits tight to the hull to save space.   
  Thanks'
  Hank

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