[PSUBS-MAILIST] At Home O2 Cleaning Process

Sun Jan 7 17:34:54 EST 2018

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-542207540152 .
>
> 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 ¼ 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.
>>
>> ·
>>
>>
>>
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