Pressure loss but no bubbles?

[tfsails]

Assuming all the obvious places are not leaking, here's what I would do: I would pressurize the reg, put the tank and pressurized reg in the water while breathing through my snorkel and look at the whole setup while under water. There should be NO bubbles coming from anywhere on the reg. Look at the SPG hose. That HP hose has weak spots built in along its length that will spring a leak before the whole hose fails. If they are leaking, you'll see bubbles coming from the entire length of that hose.

I wouldn't be surprised if your bleed-down was caused by several very small leaks that should show up under water. A few little bubbles can add up over time.

 

[Teamcasa]

Keep in mind that once the valve is shut, the volume of high pressure gas in the regulators, gauges and hoses is very small. It would only take a very tiny leak to lower the residual pressure significantly.

 

[u4ia]

Hey folks

just thought I would post a follow up after trouble shooting - thanks for all your suggestions.


and the winner is.......................................spool!

rechecked everything and swapping the spool did the trick! I have had HP spools go on me before and in those cases would see that fine stream of bubbles, but not this time. must have been an intermittent or invisible bubble stream. learn something new every day...

cheers!