[PSUBS-MAILIST] At Home O2 Cleaning Process

Sun Jan 7 20:24:28 EST 2018

I have lots of experience working with mass-flow controllers to do
precision gas dilution for sensor calibration. The brand I've always used
is ALICAT.

A mass flow controller is a servo controlled needle valve and flow sensor,
so you can set and forget flow rates. No noisy on-off switching. I've used
them for nasty things like high concentration chlorine gas for tests that
lasted for weeks at a time without any issue. They also do oxygen, but like
any other oxygen system you need to keep it clean.

One thing I've always been  cautioned about is to avoid using an MFC to
completely stop flow, and to always put a ball valve upstream and use it to
"shut down" the system. I was never told what exactly goes wrong, but I
didn't want to find out with the chlorine!

River J Dolfi
Rdolfi7 at gmail.com

On Jan 7, 2018 6:20 PM, "via Personal_Submersibles" <
personal_submersibles at psubs.org> wrote:

Send Personal_Submersibles mailing list submissions to
        personal_submersibles at psubs.org

To subscribe or unsubscribe via the World Wide Web, visit
        http://www.whoweb.com/mailman/listinfo.cgi/personal_submersibles
or, via email, send a message with subject or body 'help' to
        personal_submersibles-request at psubs.org

You can reach the person managing the list at
        personal_submersibles-owner at psubs.org

When replying, please edit your Subject line so it is more specific
than "Re: Contents of Personal_Submersibles digest..."

Today's Topics:

   1. Re: At Home O2 Cleaning Process (Alan via Personal_Submersibles)
   2. Re: At Home O2 Cleaning Process
      (Brian Cox via Personal_Submersibles)

----------------------------------------------------------------------

Message: 1
Date: Mon, 8 Jan 2018 12:03:27 +1300
From: Alan via Personal_Submersibles <personal_submersibles at psubs.org>
To: Personal Submersibles General Discussion
        <personal_submersibles at psubs.org>
Subject: Re: [PSUBS-MAILIST] At Home O2 Cleaning Process
Message-ID: <634979D1-0182-4F7A-BE2E-A97CE0842B85 at yahoo.com>
Content-Type: text/plain; charset="utf-8"

Cliff,
that looks good, you've got me interested in it. I am thinking it might
suite me to have a paediatric click regulator as well, as if their was an
electronics fault
it would be easier to control the flow by just upping the click regulator
output.
Cheers Alan

Sent from my iPad

> On 8/01/2018, at 11:34 AM, Cliff Redus via Personal_Submersibles <
personal_submersibles at psubs.org> wrote:
>
> Quite.
>
>
>> On Sun, Jan 7, 2018 at 3:19 PM, Alan via Personal_Submersibles <
personal_submersibles at psubs.org> wrote:
>> Brian, Cliff,
>> in my O2 system I am planning to have low pressure O2 coming through the
hull with first a stop valve ( needle valve) Then a manual bypass valve (
needle valve) followed
>> by a rebreather style solenoid valve & finally a click style paediatric
regulator.
>> So the paediatric regulator will be set just below normal consumption
with an automatic
>> top up from my solenoid valve based on readings from O2 sensors. The
bypass valve is
>> to manually bleed in O2 if the regulator & solenoid valve fail.
>> Brian could get away with just the stop valve, the bypass valve & the
paediatric
>> regulator seeing he has a larger hull than we do. He could just manually
adjust the
>> regulator off O2 readings.
>> Cliff, does that flow valve click on & off all the time or is it quiet
in operation.
>> Alan
>>
>> Sent from my iPad
>>
>>> On 8/01/2018, at 9:21 AM, Cliff Redus via Personal_Submersibles <
personal_submersibles at psubs.org> wrote:
>>>
>>> Brian, in my (Air Monitoring, Oxygen Control) AMOC system, I use a
Porter 201-FSVP mass controller.  Ebay has these units for sell all the
time at pennies on the dollar. These unit will both measure the mass rate
of the gas in SLPM and also control it. There are two 0-5VDC control
signals for the unit.  For this partuclar unit which has a 0-10 SLPM span,
if you give the controller pin 5V, then it will pass 10 SLPM if you give it
0V, it will pass zero SLPM.  The other singal is an analog voltage output
signal again 5Vdc for full span, would be a measured 10 SLPM and a zero
signal means it is reading zero mass flowrate of gas.
https://www.ebay.com/itm/Porter-201-AFASVPAA-Mass-Flow-
Controller-10-SLPM-760-Torr-MFC/232159305887?hash=item360dc5e09f:g:
BTAAAOSwmrlUrcG1 is a link to ebay for a unit very close to this.  Porter
(Parker) make a ton of different  controller for different rates and
different gasses.  The controller as a 9 pin blade style connector that is
used widely!
  in the medical industry.  The documentation on these meters is excellent
and you can download it https://www.parker.com/
literature/MFM%20&%20MFC%20(D-Conn.)%20(FM-898%20Rev.%20E).pdf .  The
manual calls out the spec for the connector.  I use this unit with a PLC
but single it is analog voltage signals, you could control with
potentiometer off a 5VDC source.  Likewise you could use an analog display
that would take a 0-5VDC signal if you wanted. I have found these units to
be very reliable.  In my Life support system module, I use a Swagelok a
Vernier needle valve model SS-SS4-VH as a bypass around this controller for
manual O2 bleed control.  As a backup, I use a variable area meter like
https://www.amazon.com/dp/B019YS4PSG/ref=asc_df_
B019YS4PSG5328541/?tag=hyprod-20&creative=395033&creativeASIN=B019YS4PSG&
linkCode=df0&hvadid=198097951144&hvpos=1o1&hvnetw=
g&hvrand=6957636125906653374&hvpone=&hvptwo=&hvqmt=&hvdev=
c&hvdvcmdl=&hvlocint=&hvlocphy=9027968&hvtargid=pla-542207540!
 152 .
>>>
>>> Cliff
>>>
>>>> On Sat, Jan 6, 2018 at 1:56 PM, Brian Cox via Personal_Submersibles <
personal_submersibles at psubs.org> wrote:
>>>> I just talked to my local dive shop and they will fill O2 no questions
asked .  They say they do it all the time.  I'm thinking of getting set up
with a package from DAN  Here:
>>>>
>>>>
>>>> https://www.diversalertnetwork.org/dive-store/?catno=9
>>>>
>>>>
>>>> It seems to be somewhat problematic getting the right all the
components but getting one of these units from the DAN website might make
things easier as far as getting bottles filled and so forth.  The delivery
system on these units I don't think has enough fine tuning ability
however.  Does anyone have a good flow meter to recommend?  Is there an
analog type with a little ball that floats up and down?
>>>>
>>>>
>>>>
>>>> Brian
>>>>
>>>>
>>>>
>>>> --- personal_submersibles at psubs.org wrote:
>>>>
>>>> From: "Sean T. Stevenson via Personal_Submersibles" <
personal_submersibles at psubs.org>
>>>> To: personal_submersibles at psubs.org
>>>> Subject: Re: [PSUBS-MAILIST] At Home O2 Cleaning Process
>>>> Date: Sat, 06 Jan 2018 13:58:20 -0500
>>>>
>>>> I use dilute acetic acid to remove any existing corrosion, and then a
non-solvent hydrocarbon-free detergent solution to clean, followed by a
freshwater rinse, and possibly another cycle using a separate clean batch
of detergent solution. Use dedicated brushes for each bin. A lint-free
cloth should come back clean, and the cleaner solution and rinse water
should both produce no fluorescence under UV (black light). Dry passively,
or with filtered air or bottled nitrogen so as not to reintroduce any
contaminants. Any subsequent lubrication or assembly with lubricated soft
parts should be done with oxygen compatible lubricants (i.e. Christolube).
>>>>
>>>> Sean
>>>>
>>>> Sent from ProtonMail mobile
>>>>
>>>>
>>>>
>>>> -------- Original Message --------
>>>> On Jan 6, 2018, 09:23, Steve McQueen via Personal_Submersibles <
personal_submersibles at psubs.org> wrote:
>>>>
>>>> All, I am working on cleaning some parts/pieces for O2 service on my
K-250. I am buying most items ?pre-cleaned? such as: Tank w/Valve, First
Stage Regulator, Thru Hull Isolation Valve, Flow Regulator.
>>>>
>>>>
>>>>
>>>> However, I will have some parts & pieces (mainly misc. adaptors and ?
SS tubing) I may still need to clean.
>>>>
>>>> I know an ?at home? process will fall short but looking to
create/document a procedure anyway.
>>>>
>>>> ?        I am using ASTM G93, "Standard Practice for Cleaning Methods
and Cleanliness Levels for Material and Equipment Used in Oxygen-Enriched
Environments" as the standard.
>>>>
>>>> ?
>>>>
>>>> ?        Maybe someone already has a procedure (or opinion) they want
to share?
>>>>
>>>> Steve
>>>>
>>>>
>>>>
>>>> ?
>>>>
>>>>
>>>>
>>>> ?        I am using ASTM G93, "Standard Practice for Cleaning Methods
and Cleanliness Levels for Material and Equipment Used in Oxygen-Enriched
Environments" as the standard.  I know an ?at home? process will fall short
but looking to create/document a procedure anyway.
>>>>
>>>> ?
>>>>
>>>>
>>>>
>>>> _______________________________________________ Personal_Submersibles
mailing list Personal_Submersibles at psubs.org http://www.psubs.org/mailman/
listinfo.cgi/personal_submersibles
>>>>
>>>> _______________________________________________
>>>> Personal_Submersibles mailing list
>>>> Personal_Submersibles at psubs.org
>>>> http://www.psubs.org/mailman/listinfo.cgi/personal_submersibles
>>>>
>>>
>>> _______________________________________________
>>> Personal_Submersibles mailing list
>>> Personal_Submersibles at psubs.org
>>> http://www.psubs.org/mailman/listinfo.cgi/personal_submersibles
>>
>> _______________________________________________
>> Personal_Submersibles mailing list
>> Personal_Submersibles at psubs.org
>> http://www.psubs.org/mailman/listinfo.cgi/personal_submersibles
>>
>
> _______________________________________________
> Personal_Submersibles mailing list
> Personal_Submersibles at psubs.org
> http://www.psubs.org/mailman/listinfo.cgi/personal_submersibles
-------------- next part --------------
An HTML attachment was scrubbed...
URL: <http://www.whoweb.com/pipermail/personal_submersibles/attachments/
20180108/78c590b7/attachment-0001.html>

------------------------------

Message: 2
Date: Sun, 7 Jan 2018 15:20:18 -0800
From: Brian Cox via Personal_Submersibles
        <personal_submersibles at psubs.org>
To: "Personal Submersibles General Discussion"
        <personal_submersibles at psubs.org>
Subject: Re: [PSUBS-MAILIST] At Home O2 Cleaning Process
Message-ID: <20180107152018.C8AE6E7D at m0117460.ppops.net>
Content-Type: text/plain; charset="us-ascii"

An HTML attachment was scrubbed...
URL: <http://www.whoweb.com/pipermail/personal_submersibles/attachments/
20180107/631e7c63/attachment.html>

------------------------------

Subject: Digest Footer

_______________________________________________
Personal_Submersibles mailing list
Personal_Submersibles at psubs.org
http://www.whoweb.com/mailman/listinfo.cgi/personal_submersibles

------------------------------

End of Personal_Submersibles Digest, Vol 55, Issue 33
*****************************************************
-------------- next part --------------
An HTML attachment was scrubbed...
URL: <http://www.whoweb.com/pipermail/personal_submersibles/attachments/20180107/4aca3a7c/attachment-0001.html>