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why go from 20/50 to 10/50? You have more nitrogen in your bottom mix nad at 100m a 50m END

If you're getting 500L per min at surface wouldn't you just pop your head out of water? If you're getting 500L per min between 1 and 6 you would bailout or most likely be on the surface anyway as your loop volume increased dramatically due to the free flow.

It is arguable as you are adding procedures and complexity to something that just needs monitoring and awareness which should already be part of the dive. As a development what does it do to your deco having a loop full of (probably) nitrogen that your switching procedure introduces?

You can't replace 100% of gas in a loop. You can only dilute what is there - few seconds to fill a loop and it'll start burping out of OPV or hamster cheeks and you should be off the loop. This is not a creep this is a free flow and should be dealt with accordingly Its aways terrible when...

All of your points apply equally to the other side of the argument. If the ADV is free flowing to the point of over taking the solenoid it would be a) noticeable as its going to be giving you hamster cheeks and b) audible. I don't buy your argument would drop faster than you can monitor...

I am not so sure. I don't know the details of Paul Blanchette's accident but surely if one monitors their PO2 then risks of hypoxia and hyperoxia are reduced. Convoluted solutions to swapping gas etc are just asking for more problems (like forgetting to swap as in Sven's case).

Plenty of people manage with similar sized reels for laying permanent lines in FLA caves. But you need a reel with a handle to allow you to hold with one hand (the other will be putting in tie offs) e.g., an electric fence reel TED WILLIAMS ELECTRIC FENCING REEL WITHOUT CARRY HANDLE on eBay...

No it isn't :woot:

That is the most stupid thing I ever read on a forum ... there is no etiquette between scientists who enjoy nothing better than disproving each other with evidence!

Dave - I am interested - I will be up Lancashire way next week - could we meet to discuss and let me see the head? Please PM me Graham

I have a V4Tek BOV if you're interested.

Pockets are never big enough ;)

O2 is your least valuable bailout gas and easiest for your surface support to get to you. If "really" 300L (1/2 3L cylinder) / 15min of Open circuit O2 is valuable you probably don't have enough other bailout of a good enough support team for your dive. Then balance this against the...

They do deserve it ... has to be said. BTW did you get an email off me?

Some pikey probably half inched the chalice wiht the claws in ;)

Two great dives ... one very brand new quick cell that spikes whenever solenoid fires and hence beep. Its slowing down a bit now and was behaving better on Sunday's dive. BTW if anybody finds a cheap victorian glass with two lobster claws in it at Mount batten its mine :) Graham

The main reason is buoyancy control is on left so it makes sense to not have your depth there too. That way you can adjust your depth and monitor it at the same time ... pretty logical ;)

Don't disagree with you Mark - but it does highlight what is possible. Your example of 1 breath every 4sec leading to 75L per min how often are you breathing with co2 even if its just shallow breathing. I have had CO2 twice and its not pleasant - I would think a proper hit with...

Cor ... 80% of 150-175 is 120+L per min for 15min thats alot of gas

Well if they are not supporting the product then they have no place in the supply chain you are correct