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As a professional you should access to a copy of the MSDS (by law you have the right to know what you're working with). Would you post a copy so we can see proof that the rust inhibitor is non-toxic? :D

Dude, you do not want to see what ends up in the air stream when a compressor operator doesn't drain condensate properly and the mild steel fittings downstream of the filters start to rust. Bank bottle internals can be interesting at times too. Hopefully it just gets absorbed through the...

How heavy and how deep is the item you're planning on lifting? Am I understanding correctly that you're planning to ride a 55 gallon drum to the surface during a lift, feathering the drum's buoyancy on the way up?

It shouldn't happen ever. As pointed out above, it happens when someone doesn't drain the water separator (filter) on the compressor at least every 15 minutes. If you're seeing water in the output the filter system is saturated and not working - you might as well remove the filter cartridges and...

I know of one case many years ago where activated charcoal granules were blown into a tank from an improperly hand packed cannister. They weren't reduced to a fine adhering powder once they got to the tank. Is the powder continuous throughout the inside of the cylinder? Any evidence of it...

I think Merxlin nailed it. Gearheads have been arguing about optimal gear since we started sticking our faces in the water. Aqualung vs ScubaPro vs Poseidon. (Forget that Voit and White Stag crap.) Aluminum vs steel tanks. Rocket fins with their magic vents vs full foot snorkelling fins. Those...

Interesting. There was a fair bit of a flap when going for-profit was tabled with the board of directors. I guess I assumed it was a done deal.

This hasn't been true for a long time. (early 1980s?). NAUI went for-profit several years ago. GUE with a couple of dozen instructors has had more impact than NAUI over the last decade. In the mid 70s you needed to do some serious diving to get the NAUI Advanced card -surface supplied, DPV...

Yeah. It was o.k. though - I still had my lucky rabbit's foot backup.

I'm curious Ralph - what sort of failure are you imagining here? You've mentioned equipment failure. Are you imagining your regulator suddenly locking up and not feeding you air? Something that hasn't been mentioned yet is that Spare Airs are not "set and forget" devices. They can leak...

http://www.trojanownersclub.com/reports/trojan-f32-editorial.pdf If it floats, you can dive off it. Just a matter of engineering and fabrication, and how far you want to go with hanging ladders or cutting transom doors. Not really clear from those pictures what would be required to get...

Dude, you got that right! We have Nikons and Canons at work and there's jaw-dropping pictures from both makes. I shoot Nikon but only because that's what I've been doing for the last 30 years.

I really like Tony Kern's approach to safety analysis. Dude has obviously had to deal with a few egos in his time. Amazon.com: Redefining Airmanship (9780070342842): Anthony Kern: Books Pity diving accident analysis is nowhere near the level of aeronautics. Guess we need to figure out a...

A breath of fresh air if it happens. Given the types of egos and vested interests involved it will be interesting to watch if nothing else. Thanks for keeping us posted. :popcorn:

True for: - sport divers - instructors - PSD (they have their own system and standards) - Science divers (as per PSD) and.... - sole proprietorships / one person operations The original post was about a multiperson operation doing none of the above, therefore commercial diving. They...

What's your definition of abuse? Leaving a cylinder at working pressure for several years shouldn't qualify. This is how emergency use SCBAs spend their lives, with a bleed-down and refill every three months if procedures require it.

Well, if you do have someone working for you doing anything other than instruction, google "OSHA" and get back to us about that self regulating thing.

Ah, got it. SCBA is Self Contained Breathing Apparatus, used on the surface by firemen, hazmat workers, and others who don't want to breathe the surrounding air for some reason. Scott Air Pacs are the most well known SCBAs. Different service than SCUBA.

Sorry if I wasn't clear - that was my point. I just had 4 re-tested so I don't know what the real rate was, but as Luxfer indicated it most certainly was not 80%. The problem was I then knew I didn't have a reliable testing service nearby and wasn't comfortable continuing to use the tanks while...