[PSUBS-MAILIST] Co2 scrubbers on eBay

Wed Apr 26 22:02:28 EDT 2017

Alec,

I haven't been very good about photo documenting my build as well. I
unfortunately don't have a lathe or the knowledge to make the Bronze thru
hull that the Capetian came up with on the plans and by looking at the
complexity of it figured that it would be expensive for a machinist to make
so I figured that I would be able to satisfactorily clean a sked 80 ss
nipple that was welded into the hull plus the fact that I am dealing with
LP, didn't think it would be a problem.

Rick

On Wed, Apr 26, 2017 at 3:34 PM, Alec Smyth via Personal_Submersibles <
personal_submersibles at psubs.org> wrote:

> I think you're asking about the through-hulls? My apologies, that's an
> item I didn't think to photograph those prior to assembly, and now they are
> in place there isn't much to see.
>
> On Wed, Apr 26, 2017 at 3:39 PM, Rick Patton via Personal_Submersibles <
> personal_submersibles at psubs.org> wrote:
>
>> Thanks Alec, interesting input. Do you have any pictures of what you have
>> described?
>>
>> Rick
>>
>> On Wed, Apr 26, 2017 at 2:35 AM, Private via Personal_Submersibles <
>> personal_submersibles at psubs.org> wrote:
>>
>>> Rick,
>>>
>>> While we're on the subject, here's a few more details that might be
>>> worth mentioning.
>>>
>>> The through-hull for O2 shouldn't be just a nipple welded into the hull,
>>> because you'll need to remove it for cleaning. Kittredge had a nice
>>> design.  Mine consists of a bored SS insert welded into the hull. A
>>> removable through-hull made from a large SS bolt fits into that insert and
>>> is secured from inside with a nut.  The bolt head is on the outside acting
>>> as a shoulder and seals against the welded insert with an O ring. I bored
>>> the bolt and put NPT threads on each end, so the O2 has no contact with the
>>> O ring, which can be "dirty."
>>>
>>> The hull stop needs to be a slow-acting valve such as a needle valve. No
>>> ball valves for O2, they are too violent. Mine are basically like the
>>> valves on a SCUBA tank, and came O2 clean from the manufacturer.
>>>
>>> Clean all lines and connections per Oxygen Hackers Handbook instructions.
>>>
>>> The medical regulator should be pediatric, as that gives you smaller
>>> graduations.
>>>
>>> Avoid a flow regulator that has the CGA 870 connector like the plague.
>>> These are the ones with two little studs, and they use a rubberized disc
>>> instead of an O ring. They are evil, I think they designed those seals to
>>> maximize leaks. Instead get a flow regulator with a CGA 540 connection. NPT
>>> to CGA 540 adapters are readily available, probably at your local welding
>>> store.
>>>
>>> Best,
>>>
>>> Alec
>>>
>>> On Apr 26, 2017, at 7:14 AM, Brian Hughes via Personal_Submersibles <
>>> personal_submersibles at psubs.org> wrote:
>>>
>>> Mark,
>>>
>>> Here's how I plan to try it:
>>>
>>> 1) Ordered an XS Scuba tank holder from Amazon - the bungee one for
>>> holding scuba tanks on a boat
>>> 2) Ordered the fan Alec recommended as it's the same one I use on my
>>> current setup and worked well for him.
>>> 3) Printed out the fan emergency hose adapter. Send me an email and I
>>> can send back the stl files I got from Alec. Brian at stjohnmd.org
>>> 4) Bought an MSA M COMFO respirator hose setup on eBay. They are cheap.
>>> It can attach to the adapter mentioned above and turn the canister into a
>>> huge lung powered scrubber without having to hold the hose bit it in your
>>> mouth with a scuba regulator mouthpiece. It will scrub inhalation and vent
>>> exhalation back into the sub, but a zero net gain.
>>> 5) Months ago I scored a box of medical clamps used for attaching things
>>> to those roll around poles in the hospital. They're perfect for temporarily
>>> or permamently attaching things to Harold's reinforcing rings. I can switch
>>> between which size canister setup I want to use.
>>>
>>> OK, here's what will get tried and I'll post pics when done.  In no
>>> particular order.
>>>
>>> Tank holder gets connected to medical clamp with a spacer if needed to
>>> hold out scrubber from the radius of the interior. Canister will be
>>> attached to side of the rear most starboard reinforcing ring, vertically in
>>> the middle. Drill and tap top of canister for attaching fan, make an o-ring
>>> for a proper seal.  Fan hose adapter glued to the fan.  Weld a small piece
>>> of angle iron to the reinforcing ring to hold the bottom edge of the
>>> canister.  Clamp on with fan pointed forward.  Wired with 20 amp anderson
>>> plug that, with a Y adapter, is already there and used for the ice chest
>>> based AC system (google redneck AC for images).
>>>
>>> Not an engineer and likely Alec shakes his head every time he sees one
>>> of my sub hacks, but it keeps me home at night. :-)
>>>
>>>
>>>
>>>
>>>
>>>
>>>
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>>>
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>>>
>>
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