Mailing List Archive Mailing List Archive
--=_ORCL_6564456_0_11919608151346350 Content-Transfer-Encoding:7bit Content-Type:text/plain; charset="US-ASCII" Rich, If your gauge compensates for altitude and adjusts the pressure corresponding to depth=0 based on ambient atomspheric pressure, as I understand an Aladin Pro does, then it's not a simple pressure gauge. Indicated depth=20 in that case does not mean pressure = 1.6 ATAs, but something less. I guess what I really should have asked was: 1) do Uwatec bottom timer/depth gauges, which I use with tables for all real dives, do this? I intend to find out myself by taking one on a high altitude dive with an Aladin Pro and an analog gauge. Maybe I'll even call Uwatec, or (gasp) see if I can find my instruction sheet. If anyone cares what the answer is, I'll post it to the list 2) are there any non-obvious physiological factors associated with altitude that would affect decompression or O2 tolerance? John ------------------------------------------------------------ John H. Heimann Sr. Product Manager Oracle Corporation Security Products 500 Oracle Pkwy, Box 659410 415-506-9750 (phone) Redwood Shores, CA 94065 415-506-7226 (fax) --=_ORCL_6564456_0_11919608151346350 Content-Type:message/rfc822 Date: 15 Aug 96 00:25:27 From:"Richard Pyle <deepreef@bi*.bi*.Ha*.Or*>" <deepreef@bi*.bi*.Ha*.Or*> To:gmiiii@in*.co* Subject:Re: High altitude decompression Cc:JHEIMANN.US.ORACLE.COM,<JHEIMANN@us*.or*.co*>,techdiver@terra.net In-Reply-To:<199608141126.AA12660@re*.in*.co*> MIME-Version: 1.0 Content-Transfer-Encoding:7bit Content-Type:text/plain; charset="US-ASCII" > John, call Harvard and demand your money back for that physics degree. I would > insist on it. There is nobody on this list who has both an iq above room > temperature and any diving experience. Try writing "Dear Abbey". -G What George meant was, your decompression and PO2 calculations are based on your "depth" as your depth gauge tells you. And of course, your depth gauge isn't telling you how many feet below the surface you are; your depth gauge is telling you what the ambient pressure is. Given this, and given that decompression is a function of the part of the gas that is NOT oxygen (as opposed to the PO2 per se), and given a bunch of other things that should be obvious....well...the answer should be pretty straightforward. Now...if I could only get some diving experience, I could prove George wrong on his second point. Aloha, Rich > > On 13 Aug 96, "JHEIMANN.US.ORACLE.COM" <JHEIMANN@us*.or*.co*> wrote: > >I have been thinking about some deep diving in Lake Tahoe, which is at an > >altitude of approx. 6000'. I know that decompression profiles are > >significantly changed by the reduced atmospheric pressure. What I have been > >wondering is how depth limits based on PO2s are affected. At first thought, I > >would think that one could breathe a given mix at a deeper depth than at sea > >level, since the absolute pressure at any given depth is less than at sea > >level. E.g., a decompressing diver could go on O2 at something like 24 ffw > >instead of 20 ffw and still maintain a PO2 limit of 1.6 ATA (I don't want to > >argue here about whether 1.6 ATAs PO2 when breathing O2 at 20 fsw is safe; > >this is just an example). > > > >John > > > >------------------------------------------------------------ > >John H. Heimann Sr. Product Manager > >Oracle Corporation Security Products > >500 Oracle Pkwy, Box 659410 415-506-9750 (phone) > >Redwood Shores, CA 94065 415-506-7226 (fax) > > > >-- > >Send mail for the `techdiver' mailing list to `techdiver@terra.net'. > >Send subscription/archive requests to `techdiver-request@terra.net'. > > > > > > George M. Irvine III > DIR WKPP > 1400 SE 11 ST Ft Lauderdale, FL 33316 > 954-493-6655 FAX 6698 > Email gmiiii@in*.co* > > -- > Send mail for the `techdiver' mailing list to `techdiver@terra.net'. > Send subscription/archive requests to `techdiver-request@terra.net'. > Richard Pyle deepreef@bi*.bi*.ha*.or* ******************************************************************* "WHATEVER happens to you when you willingly go underwater is COMPLETELY and ENTIRELY your own responsibility! If you cannot accept this responsibility, stay out of the water!" ******************************************************************* --=_ORCL_6564456_0_11919608151346350--
Navigate by Author:
[Previous]
[Next]
[Author Search Index]
Navigate by Subject:
[Previous]
[Next]
[Subject Search Index]
[Send Reply] [Send Message with New Topic]
[Search Selection] [Mailing List Home] [Home]