Would YOU thumb this dive?

[DanielRJones]

If I have a back gas reg failure at any point in a dive, the dive is over except for ascent and any required deco. This also applies to other things, too, such as a significant dry suit leak or torn glove in very cold water, loss of my first primary light in a hard overhead, or a computer failure. There will be other days to dive.

The only one i would differ is computer failure. I have a second computer in guage mode on my arm and also a bottom timer in my right pocket and cut tables so would be happy to finish the dive on my tables.
The other examples i agree with you

 

[TrimixToo]

The only one i would differ is computer failure. I have a second computer in guage mode on my arm and also a bottom timer in my right pocket and cut tables so would be happy to finish the dive on my tables.
The other examples i agree with you

I find a Perdix and a Petrel sufficient, and do not carry tables any more.

 

[DanielRJones]

I find a Perdix and a Petrel sufficient, and do not carry tables any more.

I would stop if i had 2x shearwater device's
Only have petrel 2 atm

 

[BoltSnap]

If it isn't working as it is supposed to work, no diving! My life and my safety and the life and safety of my buddies is worth a lot more than a dive.

 

[SJT1961]

Forgive my ignorance and the probably dumb question, as I have no experience with technical diving or doubles, but could someone please enlighten me about something? If SPG is run from left 1st stage and left post shut down, how would one know how much gas they have in the right cylinder they are now exclusively using? How would having a slung stage with bottom gas help with this loss of critical data and allow one to safely continue the dive? Thanks

 

[Ouvea]

@SJT1961 :

If you shut down your left post, you will lose the reading of your SPG. With your average or current depth and run/bottom time (assuming you've tracked them), you should know your remaining volume/pressure of gas. This is why you call the dive. Each posts supplies gas to one second stage, hence if you lose one, the dive ends. If you lose your left post which supplies gas to your alternate, then you cannot donate your primary, since don't have a working alternate. If you lose your primary, you cannot donate, as you cannot give the gas to your buddy.

Assuming each member had a stage, each has an alternate air source to donate. You could theoretically continue but I doubt anyone would. If the compromised diver had to donate, he would donate the regulator from the stage and switch to his primary (right post). What now becomes the minimum gas pressure/volume? It's not fun remembering what has failed and what is still operational, when you're task loaded and under pressure. If the diver fails to remember that the left post is not available and switches to the necklace (left post), instead of the primary (right post), panic can strike instantaneously. It goes south very quickly without repeated practice for these scenarios.

 

[Dirty-Dog]

You're barely wet. It wouldn't be unreasonable to try to fix the reg underwater, but if you can't, just get back on the boat, fix or swap the reg, and then do your dive properly.

 

[tomfcrist]

Yeah, that dive is done. Not taking risks with backgas.

 

[Caveeagle]

You're barely wet. It wouldn't be unreasonable to try to fix the reg underwater, but if you can't, just get back on the boat, fix or swap the reg, and then do your dive properly.

A full on free flow from a second stage... there is a good chance your root cause issue is a failed high pressure seat in the first stage causing your IP to overpower your second stage low pressure seat. You are not fixing this underwater.

Now a slight bubble, or intermittent issue might just be the 2nd stage is out of adjustment. Depending on how you tune/setup your regs, you might dial down the self adjuster, but you would need to remove the hose and need a tool/Allen key to fix it properly. *again, probably not practical underwayter.

It could be some debri stuck in the second stage, and clearable underwater. I would not try this unless you have really practiced this under safe conditions. Certainly not something I would try on a typical ocean hang, with current or other challenging conditions.

 

[Stoo]

I'd call it, at least temporarily. Surface and sort out the problem... a whack, an adjustment, a swap... whatever it takes. And then, assuming all is well, restart you plan., and get into the water.

But if couldn't get it sorted, I'd work on my tan!