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LOLA cross connect for Fathom

Discussion in 'Rebreather Diving' started by Blackfrogfeet, Mar 30, 2021.

  1. Blackfrogfeet

    Blackfrogfeet Registered

    # of Dives: 500 - 999
    Location: Canada
    38
    33
    What length of cross connect whip are people here using to connect their LOLA valves when diving a Fathom in the boat rig?
     
  2. tbone1004

    tbone1004 Technical Instructor ScubaBoard Supporter

    # of Dives: I'm a Fish!
    Location: Greenville, South Carolina, United States
    18,695
    11,152
    stock is 20"
     
  3. rjack321

    rjack321 ScubaBoard Supporter ScubaBoard Supporter

    # of Dives: 1,000 - 2,499
    Location: Port Orchard, Washington State
    11,279
    6,080
    you probably know this but, dont forget to always close off both sides in storage
     
    happy-diver and PfcAJ like this.
  4. Asheron

    Asheron Contributor

    # of Dives: 200 - 499
    Location: NORCAL
    164
    63
    I am getting a set for my tanks, why do I need to shut both off? Does the banjo fitting leak? Thanks!
     
  5. grantctobin

    grantctobin ScubaBoard Supporter ScubaBoard Supporter

    # of Dives: 500 - 999
    Location: Chicago
    1,049
    734
    The crossbar leaks helium.
     
    rjack321 likes this.
  6. Asheron

    Asheron Contributor

    # of Dives: 200 - 499
    Location: NORCAL
    164
    63
    Okay good to know. Thank you
     
  7. Asheron

    Asheron Contributor

    # of Dives: 200 - 499
    Location: NORCAL
    164
    63
    Okay.....why does it leak helium? Is it a PTFE line hose? Does that have permeability for helium?
     
  8. grantctobin

    grantctobin ScubaBoard Supporter ScubaBoard Supporter

    # of Dives: 500 - 999
    Location: Chicago
    1,049
    734
    I’ve never actually asked Jakub. Unsure what’s inside the stainless braid. @pcfaj likely knows.
     
  9. rjack321

    rjack321 ScubaBoard Supporter ScubaBoard Supporter

    # of Dives: 1,000 - 2,499
    Location: Port Orchard, Washington State
    11,279
    6,080
    Very large surface area of that hose (vs a tiny 2mm surface area on a valve seat). Helium will leak out through the pores in the plastic liner (not sure its PFTE or something else) and your mix with gradually change via the loss of helium over weeks or months. There is no flexible plastic material that is completely impermeable to helium since its such a tiny atom.
     
    Asheron and flymolo like this.
  10. Asheron

    Asheron Contributor

    # of Dives: 200 - 499
    Location: NORCAL
    164
    63
    Cool, thanks for the explanation
     
    rjack321 likes this.

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