Suit inflator bottle on twinset set up ?

[pisauron]

If you have to shut off a valve post, you're just not feeding gas to the regulator on that side. You're still able to feed gas from both tanks to the other regulator on the other post. If you shut down your right post, you can now longer use your power inflator on your wing, but you can certainly orally inflate via the corrugated hose. If you shut down your left post, you can no longer add gas to your drysuit, but you certainly have options available such as switching the inflation hose from your power inflator to you drysuit, if that is even necessary or helpful (wouldnt really be necessary during a blue water ascent). If you have a failure on the valve itself and shut down the manifold connecting the two tanks, you're now down to the contents of the single tank feeding the working post, but your inflation options are identical, it just makes it that much more time sensitive to clear any overhead obligations and get you and your buddies to the surface on remaining gas.

You could do an entire dive without the low pressure hose even connected to the power inflator of your BC, just by pressing the button and blowing into the inflator manually. Thats how you managed bouyuancy compensation before my time when using a horse collar:

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I think he is afraid of complete manifold failure - meaning a leak in the manifold that will cause losing both tanks together.
Inflating your dry suit is the least of your worries in that situation.

 

[DiveLikeAMuppet]

Suit inflate is required for CCR diving and if you dive trimix, you don’t need it for open circuit air/nitrox diving. Total loss of all gas is just way out there in terms of common problems - anyone has any examples - I’ve never seen an actual accident report? You would anyway have some gas in your suit and wing - it will expand on ascent and on the surface you can inflate your wing orally. Not sure what problem are you trying to solve.

If I were you, I would start with fixing your hose routing to be aligned to DIR gospel (to be predictable), D-ring positions (based on the corrugated hose they are perhaps too low), actually add a hose to inflate your drysuit and consider putting one of the regs into a bungee around your neck - to easily find it. Oh and also consider primary donate for many reasons.

Not sure what your training agency teaches - if it’s BSAC, I would try some regional coaching outside of your club. Some clubs tend to be insular and just because long term members dive in a certain way doesn’t mean it’s a good way to dive.

 

[LFMarm]

Running a separate drysuit inflation bottle is more for insulation than gas cost. Helium is an excellent heat conductor so inflating with bottom gas is a bad idea whenever the water is cold enough to actually require a drysuit.

True. Another good reason to avoid He mixes to inflate a dry suit is isobaric counterdiffusion as you would have He in contact with all your body skin inside the dry suit.