[PSUBS-MAILIST] At Home O2 Cleaning Process

Sun Jan 7 16:19:24 EST 2018

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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