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#41
posted to rec.boats.cruising
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Air compressor for hull cleaning
MMC writes:
Could it be that the rings in your compressor aren't shot? Breathe the exhaust of any of the other items you list at depth and under pressure and let me know what you find out. You're in full definitional retreat. We're talking about using a sound compressor to dive just below the surface to work on a boat hull. Not a busted compressor and plumbing the abyss. |
#42
posted to rec.boats.cruising
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Air compressor for hull cleaning
This thread is getting dumber and dumber.
Neither nitrogen narcosis nor embolism have _anything_ to do with breathing oil fumes or other garbage. Everybody go back and study physics 101 and biology 101. If that seems confusing, borrow highschool textbooks from your teenage children. Do not post before finished. Good night. |
#43
posted to rec.boats.cruising
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Air compressor for hull cleaning
Dave writes:
so one cannot by breathing oil-contaminated air at one atmosphere draw any conclusions about the effect of breathing oil-contaminated air at multiple atmospheres. The irrelevance was the reference to "multiple atmospheres" and the vacant definition of "oil contaminated". It's great that the macho diver men know all about deep diving and air purity. It doesn't earn you bragging rights for improvised hookah. We po' boat do-it-yourself'ers are jus' tryin' to dunk under the surface to work on the hull. The shop air and 1970s ScubaPro 2nd stage works fine. Looks good, tastes good, smells good, breathes good. No residues in the hoses or gear, no irritation felt, no respiratory effects noted whatsoever. No measurable loss of oil in the crankcase after hours and hours of runtime. Forgive my moral courage in scientifically evaluating a system for PEL and risking my lungs on a measured negative conclusion. The likelihood of being harmed by an error in judgment in this enterprise is negligible compared to errors in driving down the road this week. Invisible-things-will-get-you is a habit of the uncritical or unbalanced mind. I've looked in the closet, and there is no monster there. No radon in the basement, no toxic mold in the walls, no dust mites in the ducts, no subluxations in the spine, no bad humours in the shop air. |
#44
posted to rec.boats.cruising
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Air compressor for hull cleaning
Actually, for anyone with a modest ability to read between the lines, MMC's
reference to those two risks are highly relevant. His point is that Physic 101 doesn't require much reading between the lines. But it does require the reading. o just as one cannot, from breathing air at 1 atmosphere of pressure, draw any conclusions about the narcotic effects of nitrogen partial pressure at multiple atmospheres, and Nobody tried that, that's why the N2 is so off the point. And, of course one can, there even is a formula: Each seven meters equal one martini, or so I hear the man in the red hat said. But what is the effect of so many olives at depth? After all, olives are where the oil comes from, are they? Does it become worse If the olives are vaporized? So, should one chew them or swallow them hole? o just as one cannot, from holding one's breath at one atmosphere draw any conclusions about the effect on the lungs of holding one's breath while ascending from, say 30 feet after breathing compressed air, Of course one can, physics 101 again. Pressure change, volume change, ouch. You aren't confusing lung rupture with embolism, are you? Or how did that tidbit of diving physics pop up here? so one cannot by breathing oil-contaminated air at one atmosphere draw any conclusions about the effect of breathing oil-contaminated air at multiple atmospheres. Yadda. No one was trying to go deep with the compressor, be it oily or not. Remember, we are talking keel deep here. Understanding the point does, however, require a moment's thought--something often in short supply. Oh, so true. |
#45
posted to rec.boats.cruising
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Air compressor for hull cleaning
Richard J Kinch wrote: Dave writes: so one cannot by breathing oil-contaminated air at one atmosphere draw any conclusions about the effect of breathing oil-contaminated air at multiple atmospheres. The irrelevance was the reference to "multiple atmospheres" and the vacant definition of "oil contaminated". It's great that the macho diver men know all about deep diving and air purity. It doesn't earn you bragging rights for improvised hookah. We po' boat do-it-yourself'ers are jus' tryin' to dunk under the surface to work on the hull. The shop air and 1970s ScubaPro 2nd stage works fine. Looks good, tastes good, smells good, breathes good. No residues in the hoses or gear, no irritation felt, no respiratory effects noted whatsoever. No measurable loss of oil in the crankcase after hours and hours of runtime. Forgive my moral courage in scientifically evaluating a system for PEL and risking my lungs on a measured negative conclusion. The likelihood of being harmed by an error in judgment in this enterprise is negligible compared to errors in driving down the road this week. Invisible-things-will-get-you is a habit of the uncritical or unbalanced mind. I've looked in the closet, and there is no monster there. No radon in the basement, no toxic mold in the walls, no dust mites in the ducts, no subluxations in the spine, no bad humours in the shop air. Well, go ahead on and try it then. If you can still type afterwards, let us know, ok? Thank you. |
#46
posted to rec.boats.cruising
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Air compressor for hull cleaning
Well Dave, in Navy diving ops there is a "standby diver" who in hardhat
diving is completely dressed with exception of the helmet, which takes all of, let's say 5 seconds to don. The stay time may have been longer if the suit were fully inflated. Anyone that has dove the Mk 5 can tell you that if the suit (or any dry suit with an air fill) is fully inflated, the diver will be wriggling around on the surface bobbing like a cork. The o2 starts at 21% and when it drops to 16% the diver starts to experience hypercapnia AND hypoxia. The rig was designed to sustain life underwater. Attaching the hose with a nut was the highest tech option they had at the time. MMC "Dave" wrote in message ... On Wed, 26 Apr 2006 13:41:50 GMT, "MMC" said: As I remember a Mk 5 diver would be conscious for something like 6 minutes if he lost his air supply My recollection is that it would be significantly more than that. Remember, we're talking about the time required to reduce the percentage of oxygen in the fixed amount of air contained in the suit and hat combined to below a level that will sustain life. The rig was designed so the if the air hose where cut completely you could send another diver down with a new hose and hook it up to the hat. I'd be surprised if that could be done in under 6 minutes except in the most exceptional circumstances. |
#47
posted to rec.boats.cruising
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Air compressor for hull cleaning
Dave,
Please excuse my condescending previous reply to this post. I didn't know your background. MMC "Dave" wrote in message ... On Wed, 26 Apr 2006 13:41:50 GMT, "MMC" said: As I remember a Mk 5 diver would be conscious for something like 6 minutes if he lost his air supply My recollection is that it would be significantly more than that. Remember, we're talking about the time required to reduce the percentage of oxygen in the fixed amount of air contained in the suit and hat combined to below a level that will sustain life. The rig was designed so the if the air hose where cut completely you could send another diver down with a new hose and hook it up to the hat. I'd be surprised if that could be done in under 6 minutes except in the most exceptional circumstances. |
#48
posted to rec.boats.cruising
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Air compressor for hull cleaning
Dave wrote: On Thu, 27 Apr 2006 15:12:09 GMT, "MMC" said: Well Dave, in Navy diving ops there is a "standby diver" who in hardhat diving is completely dressed with exception of the helmet, which takes all of, let's say 5 seconds to don. Please don't try to explain to me how the Navy conduct diving ops. I spent 3 years as a diver and diving officer on a ship where that was a primary mission. Unfortunately your incomplete knowledge is showing. How does this second diver get down to the first diver? Do you think he simply gets up an jumps in after the helmet is secured? I don't think so. Hi MMC: Had to chime in with the non-union, pot smoking, rat divers approcah. Uhh jump righ in........... yep. The tender better have a bunch of hose in the water first. The stay time may have been longer if the suit were fully inflated. Anyone that has dove the Mk 5 can tell you that if the suit (or any dry suit with an air fill) is fully inflated, the diver will be wriggling around on the surface bobbing like a cork. I have dived in that suit. While the suit would virtually never be fully inflated absent unusual circumstances, it is nearly always partially inflated. The point is that there's far more air in the suit than just what's in the helmet. MMC, I concure. I would like to add, "....if the suit were fully inflated..." as Dave says I think you Navy guys working the Standard Navy deep Sea Dress Mod. 1 Mark V would call it an "uncontrolled assent." The o2 starts at 21% and when it drops to 16% the diver starts to experience hypercapnia AND hypoxia. Wrong except when you're at the surface. It's the partial pressure of the O2 that counts, not the percentage, and that partial pressure increases with depth. In fact at sufficient depth a 16% heo2 mix could allow one to survive breathing the mixture virtually indefinitely without such effects. MMC, Agreed, again....... in the gulf we were using the same % bottom mix for just about eveything under 420' if I remeber right. But could be wrong. When I was a green tender I asked why use a standard botom mix for such a large depth range. He said for simplicity. Did not want a shop full of diffrent bottom mixes. When you were doing gas jumps in the Navy did you calculate PPO2 and mix specific bottom gas for each job? Or just use the "good enough" approach? Not all that Salty, Bob |
#49
posted to rec.boats.cruising
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Air compressor for hull cleaning
Richard Lamb writes:
Well, go ahead on and try it then. Been doing it for years. If you can still type afterwards, let us know, ok? OK. http://www.typingtest.com/test/default.asp 87 WPM, 97 percent accuracy. |
#50
posted to rec.boats.cruising
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Air compressor for hull cleaning
Now, I retrack my retraction. I had mistakenly come under the impression
that you were someone that worked for a living. "MMC" wrote in message ... Dave, Please excuse my condescending previous reply to this post. I didn't know your background. MMC "Dave" wrote in message ... On Wed, 26 Apr 2006 13:41:50 GMT, "MMC" said: As I remember a Mk 5 diver would be conscious for something like 6 minutes if he lost his air supply My recollection is that it would be significantly more than that. Remember, we're talking about the time required to reduce the percentage of oxygen in the fixed amount of air contained in the suit and hat combined to below a level that will sustain life. The rig was designed so the if the air hose where cut completely you could send another diver down with a new hose and hook it up to the hat. I'd be surprised if that could be done in under 6 minutes except in the most exceptional circumstances. |
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