[PSUBS-MAILIST] Co2 scrubbers on eBay

Wed Apr 26 21:34:31 EDT 2017

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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