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--=====================_40342710==_.ALT Content-Type: text/plain; charset="us-ascii" I don't think the danger is so much that your tanks will explode as it is that you will have a what many people call a flash off; a small, fast fire (or low level explosion if you will) that produces carbon monoxide as a combustion product. If the fire is small or the filler happens to be away from the tank during the filling process then this can be easily missed and the diver ends up with a toxic mixture to breathe. I have not personally witnessed this occurance, but friends at dive shops have told me they have seen it happen more than once. at 07:12 PM 4/7/99 -0700, you wrote: > > Frank, > > I do not think that your tanks will "explode" if they are not O2 service. > > Let's get some feedback from the listmembers. > > 1. Anybody on this list know about any tanks that exploded while filling > nitrox? > 2. Anybody not cleaning tanks/gear and still using pp blending? > 3. Anybody had an oxygen fire due to bad system design/operator error? > 4. Anybody blending oxygen with "normal" filtered air instead of > hyperfiltrated? > > Would be interesting information. > > What I do not agree on is that pp blending is dangerous. Blending nitrox or > trimix is a simple procedure and most people (all?) get some solid info > before starting such activities. > > Some improperly designed air systems are more dangerous than any pp blending > station around. > > Adiabetic compresson is a problem when you have bad system design. Using > proper materials, valves and connections it is hard to get into trouble. > One thing people tend to forget is making sure there are no burrs in the > tubing you cut. Burrs could be the source for the start of an oxygen fire > because of the bad heat conduction and if they come loose you can get > particle impingement or a jammed valve. > > Anyway, there's a lot of misconception about blending and especially pp > blending that I do not agree with. Maybe a lot has been started by companies > that sell membranes? > They seem to hate oxygen! (I wonder why...) > > One of my favorite misconception I hear people talking about is the rolling > of tanks to get a homogeneous mix... Anybody doing that? :-) > > Being on the techdiver list, I think all members should be able to make their > own mixes when necessary and especially when in remote locations where it's > the only way. > Not being able to get Helium seems a weak answer to me, we're located on a > small island in the Caribbean and it is available to us. > > It's simple: > No helium---->no deep dives > > That will make you find it. > > Regards, > > THOMAS > SILENT IMMERSION, Inc. > Caracasbaaiweg 276 > Curacao, Netherlands Antilles > Tel/Fax: 599-9-767.70.14 > Cell.: 599-9-562.13.23 > www.silentimmersion.com > -- Send mail for the `techdiver' mailing list to `techdiver@aquanaut.com'. > Send subscribe/unsubscribe requests to `techdiver-request@aquanaut.com'. --=====================_40342710==_.ALT Content-Type: text/html; charset="us-ascii" <html> I don't think the danger is so much that your tanks will explode as it is that you will have a what many people call a flash off; a small, fast fire (or low level explosion if you will) that produces carbon monoxide as a combustion product. If the fire is small or the filler happens to be away from the tank during the filling process then this can be easily missed and the diver ends up with a toxic mixture to breathe.<br> <br> I have not personally witnessed this occurance, but friends at dive shops have told me they have seen it happen more than once.<br> <br> <br> at 07:12 PM 4/7/99 -0700, you wrote: <br> <blockquote type=cite cite>Frank, <br> <br> I do not think that your tanks will "explode" if they are not O2 service. <br> <br> Let's get some feedback from the listmembers. <br> <br> 1. Anybody on this list know about any tanks that exploded while filling nitrox? <br> 2. Anybody not cleaning tanks/gear and still using pp blending? <br> 3. Anybody had an oxygen fire due to bad system design/operator error? <br> 4. Anybody blending oxygen with "normal" filtered air instead of hyperfiltrated? <br> <br> Would be interesting information. <br> <br> What I do not agree on is that pp blending is dangerous. Blending nitrox or trimix is a simple procedure and most people (all?) get some solid info before starting such activities. <br> <br> Some improperly designed air systems are more dangerous than any pp blending station around. <br> <br> Adiabetic compresson is a problem when you have bad system design. Using proper materials, valves and connections it is hard to get into trouble. <br> One thing people tend to forget is making sure there are no burrs in the tubing you cut. Burrs could be the source for the start of an oxygen fire because of the bad heat conduction and if they come loose you can get particle impingement or a jammed valve. <br> <br> Anyway, there's a lot of misconception about blending and especially pp blending that I do not agree with. Maybe a lot has been started by companies that sell membranes? <br> They seem to hate oxygen! (I wonder why...) <br> <br> One of my favorite misconception I hear people talking about is the rolling of tanks to get a homogeneous mix... Anybody doing that? :-) <br> <br> Being on the techdiver list, I think all members should be able to make their own mixes when necessary and especially when in remote locations where it's the only way. <br> Not being able to get Helium seems a weak answer to me, we're located on a small island in the Caribbean and it is available to us. <br> <br> It's simple: <br> No helium---->no deep dives <br> <br> That will make you find it. <br> <br> Regards, <br> <br> THOMAS <br> <font color="#800000"><b><i>SILENT IMMERSION, Inc. <br> Caracasbaaiweg 276 <br> Curacao, Netherlands Antilles <br> Tel/Fax: 599-9-767.70.14 <br> Cell.: 599-9-562.13.23 <br> <a href="http://www.silentimmersion.com/" eudora="autourl">www.silentimmersion.com</a> <br> </font></b></i>-- Send mail for the `techdiver' mailing list to `techdiver@aquanaut.com'. Send subscribe/unsubscribe requests to `techdiver-request@aquanaut.com'. </blockquote></html> --=====================_40342710==_.ALT-- -- Send mail for the `techdiver' mailing list to `techdiver@aquanaut.com'. Send subscribe/unsubscribe requests to `techdiver-request@aquanaut.com'.
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