Backgas Reserve in a Stage Bottle?

[wedivebc]

We normally do 90 to 100+ minute run times in the PNW during the winter. As the bulk of the time is spent at 20 ft, you can dump some wing air and blow some argon in to warm things up if needed.
I would think Calif. would be a piece of cake. Whether the dive should be made is another story.

MD

I've started carrying a couple of extra lb lead to make room for DS inflation as well.
BTW MD, sea hunt tape arrived today. Was it as good as you remember?

 

[Scuba_Steve]

I'm no tech diver, but I notice that you're doing thirds as "1/3 of the gas on your back." I believe GUE teaches to take 1/3 of the gas on your back after you subtract out a rock bottom, which seems like a good idea to me. I sort of assumed this is just how thirds was done by everyone. Is there something I'm missing?

Hi Jonnythan:

You'd be unpleasantly surprised just how many ways the different agencies teach the rule of thirds .......I've learned a few different ways of doing it from my various agencies.

As to the dive and diver in question..........IMO this is an accident begging to happen.

Do yourself a flavour and sit this one out.

 

[kramynot2000]

As to the dive and diver in question..........IMO this is an accident begging to happen.

Hey Steve,

Can you elaborate as to why you say this is an accident waiting to happen? I really welcome a difference of opinion because that's how we learn, but if you could say why that would provide a lot more contribution to the thread.

By the way, I've heard off-line from others, that you should breathe down the stage first then go to the doubles.

 

[jonnythan]

Obviously I'm no tech diver, but here are some issues that raise flags to me:

Possibly insufficient gas - 1/3 of the gas on your back will not necessarily be enough in an emergency.

No indication of very sufficient training or experience handling emergencies at these depths.

First dive to this depth, being done at an unfamiliar site. You're not even really sure what the water temps will be.

That's a lot of depth..

 

[Spectre]

By the way, I've heard off-line from others, that you should breathe down the stage first then go to the doubles.

Did they give you reasons, or just that?

 

[msandler]

Can you elaborate as to why you say this is an accident waiting to happen?

because you needed to ask. BTW-How did you get your fill?

 

[Scuba_Steve]

Oh.....the last three posts between this one, and your last should give you the general idea of what a lot of people reading this thread are trying to tell you.

I like Mike Sandlers best

I'd think it over real hard, and then decide not to do it.

 

[Albion]

You appear to have ample gas with the 95's to do the dive, however the lost gas plans dont work too well especially 136 mins run time with no deco gas.

But if you have to ask the question should you be doing the dive?

 

[wedivebc]

Hey Steve,

Can you elaborate as to why you say this is an accident waiting to happen? I really welcome a difference of opinion because that's how we learn, but if you could say why that would provide a lot more contribution to the thread.

By the way, I've heard off-line from others, that you should breathe down the stage first then go to the doubles.

Assuming you are diving within your level of training and experience, why not reduce the BT to allow you to just use the gas you will be carrying. If this is your first foray to this depth the extra task loading might me a little higher risk for this dive. I would suggest getting some level of comfort at this depth and then increase your BT with extra gas supplies via stage or bigger tanks.
You are probably aware that a signicant number of accidents occur during gas switches. Dealing with an extra gas switch during a dive you have never attempted before seems overly challenging. If it was me I would just 'cave fill' my 95s but it's your tanks.

 

[JeffG]

Oh.....the last three posts between this one, and your last should give you the general idea of what a lot of people reading this thread are trying to tell you.

I like Mike Sandlers best

I'd think it over real hard, and then decide not to do it.

Actually..I really like the stage 36% until 110 ft to conserve back gas...I wonder who teaches that