HDTenEightyP/NetNews huggingface dataset:
From: dan@basil.eng.monash.edu.au (Dan Grimm)
Subject: Re: Oil in the tank!
Keywords: oil
Organization: Electrical & Computer Systems Eng. Dept., Monash Uni.
Date: Tue, 1 Sep 1992 02:48:01 GMT

>From: wueller@nagoya.sni.de (Ulrich Wueller)
>Subject: Oil in the tank!
>Due to a broken compressor I have got some oil in my tanks. Who has an
>advice for getting it out? Do chemicals have an impact on the quaility
>of the air?
Ulrich,
Yep, you will have very unhealthy air until you clean out your tank.
Technique used by me when our (Monash Uni.) clubs compressor dumped oil
in the tanks:
   1. let out all air
   2. remove valve
   3. Make up a bucket of hot soapy water (some detergent)
   4. Pour some in, swirl it around, pour it out.
   5. repeat 4 until the inside looks clean
   6. Pour lots of fresh water in until the tank has no residual from the
     soap or detergent.
   7. Allow to dry.   
   8. Put valve back when inside is very dry. (Grease O-ring with suitable
    stuff if available)
Hope the above helps.
Dan
Dan Grimm
Dept. Elec & Comp. Sys. Engineering, Monash Uni. Australia.
ph.(+61 3) 565 3479, Fax 565 3454,     dan@basil.eng.monash.edu.au
From: Charlie_Gibbs@mindlink.bc.ca (Charlie Gibbs)
Newsgroups: rec.scuba
Subject: Re: How about the Oceanic Datamax?
Date: 26 Aug 92 01:04:55 GMT
Organization: MIND LINK! - British Columbia, Canada
Distribution: world

In article <1992Aug25.160036.677@ccsvax.sfasu.edu>
rsoft!agate!slc3.ins.cwru.edu!magnus.acs.ohio-state.edu!zaphod.mps.ohio-state.
ed writes:

>I was once concerned that the surface interval is not displayed.  I now see
>that it is essentially useless information when diving with a computer.

     Ours display surface interval.

Charlie_Gibbs@mindlink.bc.ca
"I'm cursed with hair from HELL!"  -- Night Court
From: zipp@foosw6.enet.dec.com (Eric S. Zipp)
Newsgroups: rec.scuba
Subject: Re: Flower Gardens Tragedy
Keywords: death
Date: 4 Sep 92 20:34:29 GMT
Organization: Digital Equipment Corporation

In article <1992Aug31.193103.28963@bnr.ca>, mac@crchh570.BNR.CA (Michael Campbell) writes...
> 
>I read with some dismay today of a SCUBA fatality involving a
>diver at the Gulf of Mexico Flower Gardens Banks dive site. 

>If anyone on the net
>knows which boat was involved, and has any particulars on the 
>incident, I would appreciate it if they could post that to the 
>group. 

Michael (and others),

	Besides the following, the only other information that has been made
available is that the diver was diving off the boat Miss Vicky (sp) according
to the Coast Guard, and according the the medical examiner in Galveston, the
cause of death was ruled CAISSONS DISEASE. The exact nature of his problem
which lead to his death has not been made public. 

	GALVESTON, Texas (UPI) -- The Coast Guard reports a Texas man died
Saturday while scuba diving in the Gulf of Mexico.
	Petty Officer Mike Allen said that after other divers pulled the
victim from the water, Coast Guard helicopters were dispatched from
Corpus Christi and Galveston to take him to a hospital, where he was
pronounced dead.
	Allen identified the man as Alvin Holloway, 35, of Burleson, Texas.
	Holloway was diving in about 60-feet of water off a dive boat when he
ran into trouble at about 3 p.m., Allen said.

*******************************************************************************
* Nothing is completely worthless,... it can always be used as a bad example! *
*                                                                             *
* Eric S. Zipp 		    DEC EASYNET.    FOOSW6::ZIPP                      *
* DIGITAL EQUIPMENT CORP.   INTERNET.       "ZIPP@FOOSW6.ENET.DEC.COM"        *
*			    UUCP.	    ...!decwrl!foosw6.enet!zipp       *
*******************************************************************************
Newsgroups: rec.scuba
From: peterson@hpl.hp.com (Chris Peterson)
Subject: Re: Has anyone dived the Solomon's
Date: Mon, 31 Aug 1992 21:50:04 GMT
Organization: Hewlett-Packard Laboratories, Palo Alto, California

You might check back-issues of _Discover_Diving_ and _Undercurrent_.  I think
both publications have reviewed the Solomons in the last couple of years
(1989?).
-- 
Chris Peterson                                     Hewlett-Packard Laboratories
                                                    Research Computing Services
                                                              Palo Alto, CA USA 
                                                            peterson@hpl.hp.com
From: spindler@rcf.rsmas.miami.edu
Subject: Re: depth in the US of A
Reply-To: spindler@rcf.rsmas.miami.edu
Organization: RSMAS
Date: Wed, 2 Sep 92 16:46:17 GMT

In article <guido.715432167@sun-3>, guido@sun-3.cs.uct.ac.za 
(Guido Zsilavecz) writes:
>Question: how do US divers measure pressure at depth? bar/atmospheres
>of PSI?

We generally work with atmospheres absolute (ATA), with occasional references
to PSI just to mix it up a little.  1.0 is a lot easier to remember than 14.7
 
8-)

Cheerios,
T.
----
Todd Spindler                                  
TSpindler@rsmas.miami.edu                 RSMAS/MPO  University of Miami
From: dave@hpdstma.ptp.hp.com (Dave Waller)
Newsgroups: rec.scuba
Subject: Re: Information about advanced deep diving course wanted
Date: 3 Sep 92 16:58:09 GMT
Article-I.D.: scd.Bu0Hsx.4LG
Distribution: usa
Organization: Hewlett Packard

In article <1992Sep3.120735.28651@scifi.uucp>, njs@scifi.uucp (Nicholas J. Simicich) writes:
|> This sounds, frankly, like she developed a shunt.  A shunt is likely
|> to increase the possibility of DCS.  Personally, I believe that this
|> is the main factor in the likelihood of repeated DCS hits.  I heard a
|> tale of an instructor in the Caymans who began to get bent in the pool.

Just to clarify for those of you who don't know what a shunt is, it is an
abnormal connection between the venous and arterial blood flow that allows
blood to bypass the pulmonary circuit, thereby allowing bubbles to pass into
the arterial circulation without being filtered out by the lung tissue.

Current theory holds that, even under diving profiles that are well within
allowable maximums, bubbling occurs that can cause DCS symptoms if it
weren't for the filtering action of the lungs. This bubbling is often
called "asymptomatic", as it doesn't result in DCS the vast majority of the
time.

People who develop a shunt, or have a heart abnormality called a "patent
foramen ovale" (a hole between two chambers of the heart) are at significantly
increased risk of DCS, and should not dive.

-- 
Dave Waller
YMCA Instructor
Newsgroups: rec.scuba
From: cjb@canopus.Stanford.EDU (Cecil Bloch)
Subject: Re: certification in Jamaica: question
Reply-To: cjb@vega.stanford.edu
Organization: DSO, Stanford University
Date: Tue, 25 Aug 92 17:22:18 GMT

In article <tnickles.714261707@beagle> tnickles@boulder.Colorado.EDU (Tim  
Nickles) writes:
> I'm heading to Jamaica in september and I am not certified.
> The reasons for this are many and hinge on my ignorance and
> stupidity (to be humble)...
> 
> anyway, I wonder if anyone has any ideas (or first-hand knowledge)
> about how much one could expect to pay for certification there
> and how the quality of instruction would be.
> recommedations would be wonderful as would any other advice on 
> snorkeling sites and dive sites...
> 
I visited Negril, Jamaica last September for a week and did some diving  
through Negril Scuba Center (I think they were called).  I'm sorry to have  
to say this, but they were absolutely the worst and most dangerous outfit  
I've ever encountered anywhere.  The reefs are almost dead, strangled in  
algae, and there were very few fish. As a result very few experienced  
divers go there and in consequence the standards are rather low, since  
newer divers may not know what to demand. Based solely on this very  
limited experience, I would say that if their teaching is anything like  
their operation in general you should go elsewhere.  My impression is that  
the other scuba shops in Negril are similar -- there is just no incentive  
or demand to provide a professional level of service. The one night dive I  
did with them was an absolute farce and potentially very dangerous -- the  
divemaster (huh! some "master") got lost twice, lost half the group in the  
process, and there were no lights on the boat of any description. The  
Rasta boat driver did not even help people back on board as they slipped  
and slithered on a flimsy slippery wooden ladder in the dark.  It was  
sheer good luck that everyone made it back to shore.  My girlfriend and I  
are both experienced divers but everyone else on the boat ("tub" would be  
a better description) were on their first night dive and were rather  
spooked by the whole episode. As an aside, I also found the locals very  
unpleasant and hostile.
I went there because my girlfriend has family out there and we did some  
diving as an adjunct to the trip, not because we went there to dive.  If  
you want to go somewhere in the Caribbean specifically to dive, and where
From: rmavilla@rodan.syr.EDU (Martin Villarica)
Subject: diving in the Adirondacks?
Organization: Syracuse University, Syracuse, NY
Distribution: usa
Date: Tue, 1 Sep 92 10:47:04 EDT

Hi.
I am planning on a trip to the Adirondacks over the Labor Day Weekend.  I
think I will be in the hamlet of Long Lake (the only other reference point
I have is Blue Mountain Lake about half an hour away).  Anyway, I would like
to find out if anyone has any recommendations as to where I might be able to
dive without breaking any laws and if there are any dive stores (or clubs)
that I can contact for more information.  I tried searching the archives for
some information on the Adirondacks but was unsuccessful.  I may not have
been doing it correctly.
Thank you.
Martin Villarica
rmavilla@mailbox.syr.edu
From: FKK@SLACVM.SLAC.STANFORD.EDU
Newsgroups: rec.scuba
Subject: RE: BOUYANCY CONTROL WITH DRY SUITS
Date: 27 Aug 92 06:26:29 GMT
Organization: Stanford Linear Accelerator Center

I recently posted a comment about keeping 8 pounds on my BCD attached with
clevis pins which could be removed in a minute or so.

I got one response from one person that this was too long.  I would like to
expand the discussion and see where it goes.

The concern must be that if you ditch your weight belt in an emergency the
8 lbs. on the BCD will create a danger.  This is certainly possible but in
many cases one could sill ascent in a **controled emergency ascent** rather
than an **uncontroled emergency ascent**.  You would be slightly limited in
your maximun ascent rate.  Of couse if 8 lbs. is all you need you would'nt
want in all in your BCD.  But in Monterey I dive with 15-16 lbs. on my belt
and ditching 2/3 of my total weight will get my to the surface.

Once on the surface the extra weight on the BCD would not be a problem unless
there is a problem with your BCD.  If you didn't have the weight on the BCD you
would still be in trouble.

It seems to me that more often than not the problems with weight belts is that
people lose them far more often than they have to ditch them in an emergency.
This whole discussion started with the senario of a drysuit of air and/or a
dropped weight belt - the result of either is a dangerous ascent.  The dropped
weight belt senario applies to wet suits as well.

My point is that there are situations - conbinations of conditions and equip-
ment - that permit shifting the weight around not only safely , but with
slightly enhaced safety.  At other times this would not be a good idea but
a bad one.

Each person should evaluate their situation and decide.  I invite comments.
Newsgroups: rec.scuba
From: daigle@APOLLO.HP.COM (Joe Daigle)
Subject: Re: Information about advanced deep diving course wanted
Date: Thu, 3 Sep 1992 17:46:23 GMT
Distribution: usa
Reply-To: daigle@apollo.hp.com
Organization: Hewlett-Packard Company, Chelmsford, MA

In article <Bu0E7u.KL8@encore.com>, rcollins@encore.com (Roger Collins) writes:
|> daigle@APOLLO.HP.COM (Joe Daigle) writes:
|> 
|> >Instructors, please dont flame me for this comment, but teaching diving should be a 
|> >hell of a lot more than taking us into the water.  Whenever I ask about what I will
|> >gain from taking such and such a specialty course, the answer I get is "well, we take
|> >you on x dives in that environment".   Big deal.  While I may be asking for too much,
|> >I would also like to see a book given in each specialty course as well.
|> 
|> You should complain to the group that certifies the instructor.
|> 
|> I was *very* impressed with the PADI course I just took.  I had to spend
|> time reading, doing homework, watching videos, listening to lectures,
|> pool sessions, taking a final exam, and finally, 4 OW dives.  Among
|> those that didn't get certified in my class, one didn't turn in his
|> homework, one didn't take the final, and one didn't pass the 200 yard
|> swimming test.  I cynically expected the instructor to pass everyone
|> to make her customers happy.

I agree about OW and to some extent Advanced, it is the specialties that
I am complaining about.....  We had about the same "mortality" rate as you
did in our class.  I just wish that PADI put the amount of effort into
its specialty courses, although I hear that cave and cavern are quite
good.



-- 


Joseph W. Daigle
                          
DSEE Project Team
Open Systems Software Division   Hewlett Packard Company
MS CHR-03-DC                     508/436-4227
300 Apollo Drive                 EMail: daigle@apollo.hp.com
Chelmsford, MA 01824             HP TN: 436-4227


"Don't blame me, I didn't name it 'dizzy'"


"We are only immortal for a limited time"   --   Rush
From: f_cnnghamjk@ccsvax.sfasu.edu
Newsgroups: rec.scuba
Subject: Re: How about the Oceanic Datamax?dir
Date: 26 Aug 92 08:57:05 CST
Distribution: world
Organization: Stephen F. Austin State University

In article <14583@mindlink.bc.ca>, Charlie_Gibbs@mindlink.bc.ca (Charlie Gibbs) writes:
> In article <1992Aug25.160036.677@ccsvax.sfasu.edu>
> rsoft!agate!slc3.ins.cwru.edu!magnus.acs.ohio-state.edu!zaphod.mps.ohio-state.
> ed writes:
> 
>>I was once concerned that the surface interval is not displayed.  I now see
>>that it is essentially useless information when diving with a computer.
> 
>      Ours display surface interval.
> 
> Charlie_Gibbs@mindlink.bc.ca
> "I'm cursed with hair from HELL!"  -- Night Court
> 

 In the dive log?  

Randomly, Kelly Cunningham
<deviate@lipschitz.sfasu.edu>  NeXTMail (encouraged)
<f_cnnghamjk@ccsvax.sfasu.edu> VMS Mail (tolerated)
Life is too short to drink cheap beer. -- Maggie Mae's (Austin, TX)

>>     Once out of the water, you can recall your bottom time and
>>maximum depth by pressing the single button.
> 
>I was once concerned that the surface interval is not displayed.  I now see
that it is essentially useless information when diving with a computer.
Newsgroups: rec.scuba
From: pyron@skndiv.dseg.ti.com (Dillon Pyron)
Subject: Re: Dive Computers  
Reply-To: pyron@skndiv.dseg.ti.com
Organization: TI/DSEG VAX Support
Date: Tue, 25 Aug 1992 21:03:51 GMT


In article <1992Aug25.170053.8699@morrow.stanford.edu>, mihai@sep.Stanford.EDU (Alexander Mihai Popovici) writes:
>I wonder what are your thoughts folks, on the price of todays
>Dive Computers.  It seems to me that with the software
>being quite straightforward and the hardware pretty simple,
>the manufacturing cost shouldn't exceed $40-$50. 
>So what makes them so expensive?
>If the manufacturers complain about low volume, why don't
>they sell them for under $100.  They'll probably sell millions...
>Is it the liability?  
Most computers use ASICs, figure a cool $100K to develop one.  Allow another
$100K for software (remeber this is life support stuff, no fuckups allowed). 
The cases are a hydrodynamic trick.  Remeber the Edge, milled titanium was one
solution.  The ASICs, PCBs and LCDs probably run in the $8-12 apiece range. 
figure $20 for labor, add another $20 for marketing and shipping and $250
starts to sound like a bottom line number.  There are computers selling (mail
order) for this price range, so someone is doing it cheaper, but not by much.

Now, whether that is reasonable is another story.  I don't think dive computers
are what I'd call a high volume market.
>
>Cheers
>MIhai
>
>
--
Dillon Pyron                      | The opinions expressed are those of the
TI/DSEG Lewisville VAX Support    | sender unless otherwise stated.
(214)462-3556 (when I'm here)     |
(214)492-4656 (when I'm home)     |"Do something different, DISAPPEAR"
pyron@skndiv.dseg.ti.com          |  "DISAPPEAR"
                                     _A Day On Earth_
                                     Brave Combo
From: gd@marmara.sw.stratus.com (Greg Dawe)
Newsgroups: rec.scuba
Subject: Re: Information about advanced deep diving course wanted
Date: 2 Sep 92 13:55:19 GMT
Distribution: usa
Organization: Stratus Computer, Software Engineering



> If you get BENT once you can never dive again. That's
> assuming you live the first time. Once you've been BENT your chances of
> getting bent again, even in shallow waters is greatly increased. One deep
> dive is not worth your life. When doing deep and extended diving you need
> to seek professional training and be very aware of the dangers involved.

It's true that deep and/or mixed gas diving entails more risk than
traditional/recreational diving, and I agree that most people are not
aware of the dangers that exist below 130 feet.  However, it is not
necessarily true that if you get bent once you can never dive again.  Both
my girlfriend, and a colleague have been bent within the last year (type II
DCS hits) and both are back in the water again, albiet diving much more
conservatively.  Whether or not you can dive again is something that must
be evaluated on a case-by-case basis, the input factors of which are beyond
the scope of this discussion.

IMHO for those persons who make the choice to pursue mixed-gas diving, and/or
want to dive the Wilkes-Barre, the best, safest way to go is Key West Divers.
They charge big bucks, but you get the right training, state-of-the-art
equipment to use, and lots of surface and in-water safety support.  Three
of my diving colleagues have been to Key West Divers for training (one for
the technical NITROX course, two for the complete series of courses which
end with TRIMIX).  I plan to go sometime late this winter, in lieu of a warm
water vacation.
From: leej@sgi.com (Lee Jones)
Newsgroups: rec.scuba
Subject: Re: depth in the US of A
Date: 2 Sep 92 18:10:43 GMT
Organization: Silicon Graphics, Inc.

In article <1992Sep2.164617.26994@news.miami.edu> spindler@rcf.rsmas.miami.edu writes:
>In article <guido.715432167@sun-3>, guido@sun-3.cs.uct.ac.za 
>(Guido Zsilavecz) writes:
>>Question: how do US divers measure pressure at depth? bar/atmospheres
>>of PSI?
>
>We generally work with atmospheres absolute (ATA), with occasional references
>to PSI just to mix it up a little.  1.0 is a lot easier to remember than 14.7
> 

Brings up a good question.  I have a question on my OWI test
that asks something like "If you're 66 ft. deep in Monterey
Bay, what is the ambient pressure?" Multiple guess answers are various
numbers in PSI's.  Bottom line, my student has to remember that it's 
14.7 psi/ATM, has to allow for the one at the surface, and has to be
able to multiply 3 * 14.7.  

Do you think this is a useful question to ask?  If not, why not, and how
would you change the question to make it more useful?  Remember, this
is a NAUI Open Water I test.  These people are not divemaster candidates
(nor are they quickie resort course students :-).

Regards, Lee
Newsgroups: rec.scuba
From: spindler@rcf.rsmas.miami.edu
Subject: Re: depth in the US of A
Reply-To: spindler@rcf.rsmas.miami.edu
Organization: RSMAS
Date: Wed, 2 Sep 92 22:30:10 GMT

In article <pbp8i4s@fido.asd.sgi.com>, leej@sgi.com (Lee Jones) writes:

>Brings up a good question.  I have a question on my OWI test
>that asks something like "If you're 66 ft. deep in Monterey
>Bay, what is the ambient pressure?" Multiple guess answers are various
>numbers in PSI's.  Bottom line, my student has to remember that it's 
>14.7 psi/ATM, has to allow for the one at the surface, and has to be
>able to multiply 3 * 14.7.  
>
>Do you think this is a useful question to ask?  If not, why not, and how
>would you change the question to make it more useful?  Remember, this
>is a NAUI Open Water I test.  These people are not divemaster candidates
>(nor are they quickie resort course students :-).

It is, IMHO, a good idea to try to give the student an appreciation of the
magnitudes of the pressure ranges a diver experiences in the course of a dive. 
The physical principles (Boyle's Law, Charles's Law, etc) are, of course,
important to understand, but a grasp of the actual numbers is also central to
getting a feel for the underwater environment.  The key is to relate those
pressures in terms that correspond with a student's physical intuition.  And
since we in the US are still saddled with the English system of measurement,
the conversion of pressure from ATA to PSI is an annoying but necessary step.

Adios,
Todd
Todd Spindler                                  
TSpindler@rsmas.miami.edu                 RSMAS/MPO  University of Miami
Newsgroups: rec.scuba
From: carl@Cayman.COM (Carl Heinzl)
Newsgroups: rec.scuba
Subject: Re: Boyancy control with drysuits
Date: 26 Aug 92 18:11:37 GMT
	<p185eco@fido.asd.sgi.com> <1992Aug25.233313.16853@hplabsz.hpl.hp.com>
Organization: Cayman Systems Inc., Cambridge, MA
In-reply-to: peterson@hpl.hp.com's message of 25 Aug 92 23:33:13 GMT
bcc: carl


>If my memory serves me properly, it only takes about 2psi overpressure to start
>tearing the alveoli of the human lung.  If you do the numbers, there is more
>than a 2psi increase from about 5fsw to the surface (closed, flexible vessel
>like one's lungs while breath-holding).

There is a 2psi increase EVERY 4.5 feet that you ascend, not just the
last 4.5 feet!!!  Why is the last 5 feet any more dangerous than the
1st (i.e. when you begin your ascent)???

I understand that the lung volume change in the last x feet is the
largest percentage change.  Are there two separate mechanisms at work
here?  The overpressure caused by 2 psi (every 5 feet of difference
coming up from the bottom) as well as the large volume percentage
change seen in the last x feet of ascent.

-Carl-
--
Newsgroups: rec.scuba