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At 03:41 PM 11/7/95 +0000, you wrote:
>At 03:38 PM 11/7/95 +0000, John T. Crea wrote:
>>At 12:09 AM 11/7/95 -0500, you wrote:
>>>The Navy Tables are now online at
>>>
>>>http://http.tamu.edu:8000/~mdb3774/navytables.html
>>>
>>>http://http.tamu.edu:8000/~mdb3774/scuba.html
>>>*************************************************************************
>>>* *
>>>* Kurt Schmidt <KurtAggie@ta*.ed*> *
>>>* HTTP://http.tamu.edu:8000/~mdb3774/scuba.html *
>>>* Texas, Arknasas, Missouri, Tennessee, Louisiana Dive Lists *
>>>* Links to Thousands of SCUBA Pages World Wide *
>>>* *
>>>* Texas Diver Zine *
>>>* http://http.tamu.edu:8000/~mdb3774/texasdiver/ *
>>>* *
>>>*************************************************************************
>>>
>>>--
>>>Send mail for the `techdiver' mailing list to `techdiver@terra.net'.
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>>>
>>
>>Kurt,
>>
>>Are you referring to the "old" Navy Tables (Haldane based), or the
>>"new" Navy Tables (statistically based)??????
>>
>>John
>
>The date is stated on the table. 4/94. to my knowledge that is the latest
>revision.
>*************************************************************************
>* *
>* Kurt Schmidt <KurtAggie@ta*.ed*> *
>* HTTP://http.tamu.edu:8000/~mdb3774/scuba.html *
>* Texas, Arknasas, Missouri, Tennessee, Louisiana Dive Lists *
>* Links to Thousands of SCUBA Pages World Wide *
>* *
>* Texas Diver Zine *
>* http://http.tamu.edu:8000/~mdb3774/texasdiver/ *
>* *
>*************************************************************************
>
>
Kurt,
I checked out the tables, and they are the "old" US Navy tables.
Is there any reason for putting these out dated, risky tables onto
the web, let alone announcing it on techdiver????
These tables, when used for deep and/or long exposures produced unacceptable
DCS rates when evaluated by Ed Thalmann and the US Navy back in 1985 to see
if the US Navy algorithm was appropriate to incorporate into a Diver Carried
Computer. They found that DCS rates were unacceptable on decompression
dives requiring greater than 30 minutes (ie, DCS "bends" rates as high as
16%).
"The US Navy standard air decompression tables are widely quoted, for
example, but little information has been available on their safety until the
recent tests by Thalmann and the maximum likelihood analysis by Weathersby.
Navy schedules with decompression times ranging from 10 mintues to 30
minutes has estimated decompression risks of 1-3 per cent as shown in Table
4-7. Long dives, such as 180 minutes at 60fsw or 120 minutes at 80fsw, have
estimated risks of 10 to 16 per cent and require triple the decompression
time specified by teh Standard Air Tables. Deeper and shorter dives, such
as 40 min at 150fsw or 30 min at 190fsw, have estimated risks of 5 percent
and require double the standard decompression time. Longer dives, such as
60 minutes at 150fsw or 40 minutes at 190fsw, have estimated risks of 9 to
15 per cent, and are not safe even with triple the standard decompression
time. ("Diving Medicine", 2nd edition, Bove and Davis, ISBN # 0-7216-2934-2)
I have to presume that these tables are being "published" by your web page,
but cannot understand why - is it just to demonstrate that you can do this
via html??? Or do you really think the world wide diving community needs
to be diving these out-dated tables?????
John
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