[scubanimal]

I see plenty of posts discussing off-board gas, but I do not have enough information to do it myself. What are the components to add off-board dil to an Inspiration (Vision)?

Plumbing to the manual Add is obvious, but do any of you plumb to the ADV? if so how do you set up a quick disconnect?

Thanks!

[Dave & Sandy]

We plumb only to the dil mannual add via bailout cylinder.

[chunter]

I have the male end of the GCS coming from my manifold, out and over my left shoulder where it hangs about 5 inches from the bottom of the counterlung. I then have the female end coming from my offboard tank. I leave my onboard diluent turned off until I get to 70 feet at which time I disconnect my offboard trimix and turn on my onboard air. I do a diluent flush at that time.

I used to plumb into my manual addition, and the major reason I wanted it set up as above is that I wanted everything to change over at the same time. I didn't want to chance my ADV injecting air at 350 or 400 feet (although I also have a shut-off on that). I also have an OC/DSV hooked into my manifold, and I wanted it and the AutoAir to change over to trimix also. The last thing I want is to bail out onto air at depth. Obviously, I also have a 2nd stage on my offboard tank, but having practiced bailing out to my OC/DSV and AutoAir, I didn't want habbit to kill me in an emergency.

I have found this to be very simple because my rig is always the same. I always have onboard air, and when I want to do deep dives, all I have to do is plug in my offboard trimix. The risk you run is that you forget to turn your onboard air off, and end up with an unknown mix.

I have worked with other configurations where you unplug your onboard tank to switch it over to your offboard tank, but plugging and unplugging was difficult when the lines were pressurized. In the end, this has worked well and hasn't cost a fortune in fittings.

Aloha,
Charlie

[diverklondike]

Take a look at the article on the Golem BOV. There is some good information within it on off-board.

Dive Safe Mark

[scubanimal]

Thanks guys!

[jptaylor9]

Spoke to sales at APD and was told that their GCS (without flow stop) is only rated to 40m (30m if flow stop used).

I was told it was based on the amount of gas it can deliver.

I guess this makes some sense if were talking air, but what about Helium based mixes, could the GCS be used at greater depths?

Anyone?

JT

[silent running]

Quote: (Originally Posted by scubanimal)

I see plenty of posts discussing off-board gas, but I do not have enough information to do it myself. What are the components to add off-board dil to an Inspiration (Vision)?

Plumbing to the manual Add is obvious, but do any of you plumb to the ADV? if so how do you set up a quick disconnect?

Thanks!

Hi Scubanimal, I don't have an APD unit, but I use my Dil reg as a manifold and have an LP male whip with shut off that I can plug into my offboard female LP from the offboard tank. It hangs down the inside of my CLs. The fittings are bigger than the standard PL whip fittings, so no gas flow issues there. I keep air in the back gas cyls and tmix in the offboard and all I have to do is close the back gas valve and open the offboard valve, no fiddling with QCs underwater. I like it, it's not as easy as a gas block, as it requires me to open one valve in one place and close another and then verify which gas is on by looking at the gages. But It's just enough work to make me think about what I'm doing.

That being said, I haven't changed dil underwater, all switching is done on the surface, before I get in. It's just a convenient way to avoid having to refil my dil cyl or carry 2, which is not realistic for my travels. Or if I needed to go SCR, the offboard would then be flowing through the dil add. -Andy

[chunter]

Quote: (Originally Posted by jptaylor9)

Spoke to sales at APD and was told that their GCS (without flow stop) is only rated to 40m (30m if flow stop used).

I was told it was based on the amount of gas it can deliver.

I guess this makes some sense if were talking air, but what about Helium based mixes, could the GCS be used at greater depths?

Anyone?

JT

My feeling (and I accept no liability here) is that APD says that because they have not tested it past 40M. I have had mine past 100m with no issues. I can't see any physical reason why there would be a problem going past that. The 1st stages are depth compensating, and the GCS doesn't seem to restrict flow at any depths I've been to.

I even have an OC/DSV that I have used at depth and had no problems. The GCS was plumbed into the manifold, as was the LP feed for the 2nd stage on my OC/DSV.

[jptaylor9]

Quote: (Originally Posted by chunter)

My feeling (and I accept no liability here) is that APD says that because they have not tested it past 40M. I have had mine past 100m with no issues.

Would you say that as long as the Equivalent Air Density Depth (EADD) of the gas is not greater that 40m, you should be OK?

[UKSteve]

Quote: (Originally Posted by jptaylor9)

Spoke to sales at APD and was told that their GCS (without flow stop) is only rated to 40m (30m if flow stop used).

I was told it was based on the amount of gas it can deliver.

I guess this makes some sense if were talking air, but what about Helium based mixes, could the GCS be used at greater depths?

Anyone?

JT

Isn't the hardware the same as that used to connect the direct feed to the auto air device supplied with the Inspiration?

If so does that mean that it too is only rated to 40m or is it only coincidental that 40m is also the stated depth rating of the whole unit with air diluent.

Steve