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Another thing to consider here is when to add oxygen. Because oxygen is obviously the critical gas here (in trimix or heliox) I always add oxygen second, which means in the middle with trimix. You might consider dumping in1500 helium, cooling, and then adding O2 and topping off w/ helium Digital gauge or not, it's more accurate with a delta pressure than absolute. (see archives) Give it a shot, it's worth a try. >From: <kirvine@sa*.ne*> >Date: Thu, 30 Dec 1999 20:33:43 -0500 >Reply-To: kirvine@sa*.ne* >X-Mailer: Mozilla 3.01C-KIT (Win95; U) >To: Rob Murray <robworld@ad*.ne*> >CC: techdiver@aquanaut.com >Subject: Re: intermediate stops and helium mixing > >It is the difference in compressibility - yo do not get the same amount >of helium per psi as oxygen. > >Rob Murray wrote: > > > > Hi George, > > Thanks for the info on the intermediate stops. That was one of the few > > pieces of the puzzle that still eluded me. I've been diving heliox lately > > and been having great results so far. The one thing that has been a bit of > > a pain is mixing low fo2 heliox mixes though and I was wondering how you > > were dealing with it. I've been using anywhere from 21/79 to 30/70 heliox > > and the 21/79 was the hardest to hit first time. Not sure if it was just > > the heat expansion of the helium or another factor. We are using a digital > > gauge so that should almost eliminate the problem with the O2. For the > > helium we have the electric booster so can get the pressure up to 2700 > > easily. I first add the O2 then bring the tanks to the shop and add the > > helium with a 10-12% over fill of helium and let sit. > > Is this pretty much the extent of it or am I overlooking something or just > > need to get the "feel" for filling heliox like I did for nitrox/trimix? > > > > Thanks again and Happy New Year. Safe diving and smoke some cave in 2000! > > > > Rob > > >-- >Send mail for the `techdiver' mailing list to `techdiver@aquanaut.com'. >Send subscribe/unsubscribe requests to `techdiver-request@aquanaut.com'. ---------------------------------- Kevin Connell <kevin@nw*.co*> NW Labor Systems, Inc http://www.nwls.com ---------------------------------- -- Send mail for the `techdiver' mailing list to `techdiver@aquanaut.com'. Send subscribe/unsubscribe requests to `techdiver-request@aquanaut.com'.
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