LOLA cross connect for Fathom

[Blackfrogfeet]

What length of cross connect whip are people here using to connect their LOLA valves when diving a Fathom in the boat rig?

 

[tbone1004]

What length of cross connect whip are people here using to connect their LOLA valves when diving a Fathom in the boat rig?

stock is 20"

 

[rjack321]

What length of cross connect whip are people here using to connect their LOLA valves when diving a Fathom in the boat rig?

you probably know this but, dont forget to always close off both sides in storage

 

[Asheron]

you probably know this but, dont forget to always close off both sides in storage

I am getting a set for my tanks, why do I need to shut both off? Does the banjo fitting leak? Thanks!

 

[grantctobin]

I am getting a set for my tanks, why do I need to shut both off? Does the banjo fitting leak? Thanks!

The crossbar leaks helium.

 

[Asheron]

The crossbar leaks helium.

Okay good to know. Thank you

 

[Asheron]

The crossbar leaks helium.

Okay.....why does it leak helium? Is it a PTFE line hose? Does that have permeability for helium?

 

[grantctobin]

Okay.....why does it leak helium? Is it a PTFE line hose? Does that have permeability for helium?

I’ve never actually asked Jakub. Unsure what’s inside the stainless braid. @pcfaj likely knows.

 

[rjack321]

Okay.....why does it leak helium? Is it a PTFE line hose? Does that have permeability for helium?

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]

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.

Cool, thanks for the explanation