• Welcome to ScubaBoard


  1. Welcome to ScubaBoard, the world's largest scuba diving community. Registration is not required to read the forums, but we encourage you to join. Joining has its benefits and enables you to participate in the discussions.

    Benefits of registering include

    • Ability to post and comment on topics and discussions.
    • A Free photo gallery to share your dive photos with the world.
    • You can make this box go away

    Joining is quick and easy. Login or Register now by clicking on the button

My Rix SA-6 Diesel

Discussion in 'Compressors, Boosters & Blending Systems' started by rob.mwpropane, Nov 11, 2020.

  1. rob.mwpropane

    rob.mwpropane Contributor

    1,702
    1,061
    I appreciate you taking the time to respond and your insight.

    The T and plug under the digital gauge is for O2 later.... not a big deal to remove. The T with caps on the other side of the PMV is for 2 separate whips that are not installed yet, just easier to work without hoses for now. I have caps hand tight to avoid damaging the threads on the fittings. They will get tied directly to each. I wanted 2 whips so I can leave the compressor running and swap between tanks and keep things moving.

    Each gauge has JIC fittings to be easily removed. The digital gauge and the gauge at the tower will most likely stay, the other gauges will most likely be removed and capped (I believe Ian had mentioned to do it this way? Someone earlier in this thread did). I just needed a baseline for when the compressor starts to act up later down the road.

    No Sir, never did I say I'm an expert on high pressure gases, not once, not ever. My first post and many in this thread state my lack of experience. The only thing that I have any knowledge of is propane and I don't consider myself an expert, always learning, and I wouldn't even consider propane a high pressure gas. This is my fist attempt at a compressor, my first attempt with high pressure fittings. I'm really just learning.
     
  2. rjack321

    rjack321 ScubaBoard Supporter ScubaBoard Supporter

    # of Dives: 1,000 - 2,499
    Location: Port Orchard, Washington State
    11,260
    6,057
    Will it work? I guess so, time will tell. I think you are going to have compression fittings leaking after about the 3rd time attaching and detaching them.

    Does it look professional, tidy, and built to a high standard? Not at all. It looks like a random collection of Ts and extensions cobbled to together.
     
    tmassey likes this.
  3. rob.mwpropane

    rob.mwpropane Contributor

    1,702
    1,061
    Ok... let's start here; besides the JIC fittings, is there anything wrong with this?;

    20210403_110320.jpg
     
  4. rjack321

    rjack321 ScubaBoard Supporter ScubaBoard Supporter

    # of Dives: 1,000 - 2,499
    Location: Port Orchard, Washington State
    11,260
    6,057
    Some examples

    Frame mounted gauge panel (on a booster but same idea)
    160737119_10159175835202370_3259018355647821078_n.jpg

    Frame mounted filters with a wall panel
    173519473_5364884733583211_8170277588139729351_n.jpg
     
    rob.mwpropane likes this.
  5. rjack321

    rjack321 ScubaBoard Supporter ScubaBoard Supporter

    # of Dives: 1,000 - 2,499
    Location: Port Orchard, Washington State
    11,260
    6,057
    Why do you have a gauge before your final separator?

    Why do you have a check valve or PMV after your final separator but before your actual filters? You only need one PMV and it goes after your final filter.

    Why the pressure relief valve downstream of the PMV/check valve? That relief should be on your final separator , immediately downstream of the compressor and upstream of ANYTHING that could fail closed (the PMV/check valve probably won't fail closed but stranger things have happened)

    Does that QD have a valve in it? If you were to accidentally start the compressor without the male side attached (maybe its inserted but fails to fully click in and open the valve) it will pressurize and you'll be screwed because you have no way to vent the space between the PMV and the QD - I guess unscrew the pressure relief and pray.

    I can't tell what is the right side is doing.

    You keep adding stuff all over the place that either isn't actually required, or is in the wrong part of the flow path, in the wrong order, or is just superfluous. Do you own stock in Parker or McMaster?
     
    rob.mwpropane likes this.
  6. rob.mwpropane

    rob.mwpropane Contributor

    1,702
    1,061
    The gauge is measuring the final stage pressure.

    I bought this Rix used and a lot of your questions would have to be asked to the original owner. The only thing that I did to the compressor side was add the gauges. The QD, PMV, pressure relief valve were all plumbed exactly how you see it beforehand. I posted pictures in the beginning of this thread, I looked around and asked questions. Not once did anyone mention anything about the way the original setup was, I was told to add gauges on the 2nd and 3rd stages to monitor baseline and make the gauges easy to remove and reinstall to periodically check the pressures to monitor 2nd and 3rd stage health.

    The QD does have a valve in it, and you're right. I would be screwed if the compressor was started without it connected. For now I can switch around the M/F sides.

    I've attached a better picture of the right side (all I added from the original setup was the gauges);

    20210403_110627.jpg


    I ordered exactly what I was told to order, or at least how I interpreted what I was told to order.

    I'm glad that you're here trying to help, I appreciate your time to type all that out. I have a lot of thinking / reading to do. Your examples also help.
     
  7. rjack321

    rjack321 ScubaBoard Supporter ScubaBoard Supporter

    # of Dives: 1,000 - 2,499
    Location: Port Orchard, Washington State
    11,260
    6,057
    Just because it came to you this way doesnt mean its correct.

    Your final filter tower is going to fall over the second you start your pump
     
  8. rob.mwpropane

    rob.mwpropane Contributor

    1,702
    1,061
    Which is why I came here in Nov of 2020 and posted pictures looking for insight. The pictures of how this was received were posted on page 1 and not one person including yourself ever said anything about how wrong it was.

    My final filter tower isn't done, the picture is just test fitting where it would look good mounted / attached to the side of the frame. If it's hard mounted to the frame as you have in one of your pictures how will that fall over?

    Question; is there a problem / issue mounting the PMV on a 90 like in this picture. Should it be straight? I can start moving things around with that answer.
     

    Attached Files:

  9. grf88

    grf88 ScubaBoard Supporter ScubaBoard Supporter

    # of Dives: 1,000 - 2,499
    Location: Markham, Ontario
    2,268
    1,991
    I have a check valve before the tower and a PMV after it. I am sure I am not the only one as it ensures that the tower remains pressurized.
     
  10. couv

    couv Instructor, Scuba

    # of Dives: 1,000 - 2,499
    Location: 13th floor of the Ivory Tower
    6,108
    3,973
    Same here. In fact my setup is like this (I'm not saying it's correct; it just seems to make sense to my uneducated self):
    Compressor -->check valve--> moisture separator -->check valve-->MS only tower-->check valve-->main filter tower-->PMV

    I wanted a setup that maintained most of the pressure in the system while I drain the separator. Also, I can open the separator petcock and let the compressor run unloaded during startup and shutdown.
     
    rhwestfall and rob.mwpropane like this.

Share This Page