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So as I understand what Simon wrote in that post, he is saying that dissolved O2 alone cannot fully replace Hb transport. I don't think what Dr. Sotis said or what I wrote contradicts that. If Hb transport is impaired enough to make a deficit in the amount of O2 required by the tissues, there...

Citation, please. Always happy to learn from Simon and missed whatever he had to say on the topic. However, I'd think that there are situations where the hemoglobin has not all been bound to CO where her point is valid outside the accepted norms of O2 toxicity. Perhaps not, though.

I didn't mean to imply greater or lesser solubility, since I don't recall it being discussed and didn't look it up, so I plain don't know. I don't think it's hidden in what I wrote, which was mean to describe it. Perhaps I could have done that better (shrug). Your last sentence is precisely...

At a BTS seminar several years ago, Dr. Claudia Sotis* pointed out that O2 dissolves in blood plasma, just like inert gases do. There are depth/PPO2 combinations at which the dissolved O2 can deliver enough to the cells to offset the deficit caused by CO having bound to hemoglobin. She showed...

The Petrel would be a fine primary computer. It'll do just fine in a secondary/backup role as well.

You do NOT want to tear things "down there." The ensuing surgery really sucks. And you'll be back on opiates because the pain is really bad. And then, you'll be constipated *again*. Do whatever you have to do to avoid that. Anything at all.

Some are time-release and not subdivisible. So Pete should check with his doc before changing dosage and frequency unless he already knows what's what. Constipation is a well-known side effect of opiod painkillers. About all one can do is take laxatives, use an enema, or abstain until you...

I was never taught this, simply because power inflaters weren't around when I learned to dive. But the first time it happened to me, I just disconnected it. Pretty obvious, I would have thought. I mouth inflated the rest of the trip. Since I'd learned to dive that way it didn't seem like a...

Yeah. That's exactly why my compressor and blending stuff has all paid for itself several times over. The people I was diving with were easily paying 4x what it was costing me to mix at home. Trimix was the big savings but nitrox and O2 fills factored in nicely as well. The profit margins...

Yup. That, too. But the shop that mixed my gas before I did it myself blew them down every time, and they had a very nice 2-stage booster (an AG15/30 if memory serves).

Some shops always start from scratch, for a couple of reasons. (a) It's simpler. (b) They don't know who filled it last, necessarily, so they know the fill is *their* fill and believe they are less exposed to liability. I don't, because (a) it's noisier, (b) it doesn't really complicate...

Time, as I said, also works. So does transport by car or truck. But the essential point is that you do what you have to do to figure out what's happening when the mix is not what's expected. The analysis should closely match the intended blend. When it doesn't, you can wait, you can roll...

Respectfully, every 3 months on the old filters would be much better than twice a year. Monthly, even, if you're pumping a lot of gas. I applaud the use of an attached CO monitor.

Without context I'm not sure what the author is getting at. However, it takes time for partial pressure blends to mix if the gases are added slowly (as they should be). If the tank is analyzed immediately after a PP blend started with O2 and finished with air the analyzer will often read a...

Parker. Use the brass ones. The SS ones gall eventually.

Recommended reading: http://www.seasubsea.com/index.php?option=com_rokdownloads&view=file&task=download&id=87%3Aunderstanding-scuba-compressors-and-filtration&Itemid=75

I have two crushed neoprene suits and a trilam. I haven't dived the trilam in quite a while. It's a good suit and it fits well but the crushed neoprene is far tougher for wrecks and other places where there might be sharp stuff. From a diving standpoint the crushed neoprene suits are warmer...

I seem to have gotten lost on the way to the Pub, and ended up in a deli! But carry on...

It is possible to run out of luck in a big way (underwater cave or wreck collapse, collision with a submarine, marine life hazard, etc.) but in general I do not agree. The deeper you go, the more you need to have thought through the contingencies and brought the right stuff with you. Training...

<snip> May I offer an alternative? Get a number of pill bottles, one per dose per day. Mark them with the time you are allowed to take the meds and the meds they contain (combine them in one bottle when they coincide). Put a 24-hour clock next to them and line them up in order. Replenish a...