Omniswivel Gas Switch in Cold Fresh Water

[MattPSI]

I'm planning to do some dives this summer in Clear Lake in Oregon. Supposedly the temp typically varies between 35-44 degrees F. I have a OTS Guardian FFM with pony tank and Omniswivel gas switch. I'm wondering if anyone has experienced icing on the gas switch block during very cold water dives. It seems that ice could prevent moving the switch if it were to collect heavily. I'm guessing it is not a likely scenario, but please weigh in if you have any experience with it. Thanks!

 

[tbone1004]

should be negligible adiabatic cooling in the manifold block due to no significant pressure drop. I would not be concerned. Icing occurs when the pressure drop from the first stage to IP or the second stage to ambient, and the water flow around that block needs to be there to warm it back up. At the surface the first stage is the problem child because it is exposed to the air instead of being fully submersed, and while diving it is the second stage since it has moisture from your breath but no water to warm it back up.

 

[MattPSI]

Ok that explaination totally makes sense. Thank you!