[PSUBS-MAILIST] Co2 scrubbers on eBay

[Rick Patton via Personal_Submersibles]

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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