UKRS pot dive report

Here's a brief write up and some photos from our afternoon out at
the NDC Chepstow for the UKRS pot dive that took place on Saturday.

http://www.bubbling-under.com/diving...UKRSfeb04.html

Thanks for organising Danny, an interesting experience!
Chris


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In article <087bdac74ce01bdfa76a5515c41d9fbc.96046@mygate.mai lgate.org>,
Chris Bell <posts@bubbling-under.com> wrote:
>Here's a brief write up and some photos from our afternoon out at
>the NDC Chepstow for the UKRS pot dive that took place on Saturday.
>
>http://www.bubbling-under.com/diving...UKRSfeb04.html

Interesting profile....

It's almost raw Buhlmann with no conservatism added at all.

10m/min descent rate.

No deep stops. (1st Pyle stop would have been at 27m, 1st GF stop with my
settings would have been at 21m)

5m to surface in no time at all?

Wow.

Even I wouldn't do that profile on my Inspriation.

Hands up who had prickly skin afterwards?

Gordon

"Gordon Henderson" <gordon@unicorn.drogon.net> wrote in message
news:c1dcar$7qu$1@unicorn.drogon.net

>
> 5m to surface in no time at all?
>
> Wow.
> Gordon

<snipped>

The final profile of the dive as shown on Chris' computer is incorrect.
I was outside the pot, as I had been working there during the day (or as
Chris put it, "getting free air fills")I can confirm that they were held
at 6 mtres for 3 minutes, and then a further 3 minutes at 3 metres.
Prior to "surfacing" the operter asked everyone to confirm that their
computers were clear of any decompression obligations.

Steve


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"Steve Jones" <steve.jones@wda.co.uk> wrote in message

> at 6 mtres for 3 minutes, and then a further 3 minutes at 3 metres.

That's right. As I said in the report, due to the computer being dry,
when we got to 3m, it thought it had surfaced even though they held
us 3m for 3mins.

Chris


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In article <e42afcc183b68be8a5f479ac5cd5f473.125781@mygate.ma ilgate.org>,
Steve Jones <steve.jones@wda.co.uk> wrote:
>"Gordon Henderson" <gordon@unicorn.drogon.net> wrote in message
>news:c1dcar$7qu$1@unicorn.drogon.net
>
>>
>> 5m to surface in no time at all?
>>
>> Wow.
>> Gordon
>
><snipped>
>
>The final profile of the dive as shown on Chris' computer is incorrect.

OK. I didn't see that the first time I read it.

Even so, it seems to go against everything we've been doing for the past
few years. A few deeper stops in the ascent wouldn't have done any
harm at all...

BTW: I remember a warning never to have my Aladin Nitrox out of water
if it were in a chamber... Never quite worked out why though - maybe it
thought it was dry therefor on the surface?

Gordon

Chris Bell wrote:
> http://www.bubbling-under.com/diving...UKRSfeb04.html

....and the trips page has been updated.

Al.

>
> BTW: I remember a warning never to have my Aladin Nitrox out of water
> if it were in a chamber... Never quite worked out why though - maybe it
> thought it was dry therefor on the surface?
>
> Gordon

AFAIK it's because the seals are warranted for pressure whilst immersed in
liquid, not gas. If the seal was slightly porous, the case of your computer
would slowly equilibrate with the chamber, and could then suffer a 'reverse
squeeze' at the end of the dive, possibly damaging seals, casing or pressure
sensor. This was the reason given to me when I was advised to remove my
dive watch before going into a chamber - they had broken several in the
past.

Oh I see... I didn't read the page until after the first post... they did
offer a bucket of water but you just held on to yours.


"Bob Davis" <bob.davis@ntlworldnospam.com> wrote in message
news:IWv_b.2696$396.2215@newsfe3-win.server.ntli.net...
>
> >
> > BTW: I remember a warning never to have my Aladin Nitrox out of water
> > if it were in a chamber... Never quite worked out why though - maybe it
> > thought it was dry therefor on the surface?
> >
> > Gordon
>
> AFAIK it's because the seals are warranted for pressure whilst immersed in
> liquid, not gas. If the seal was slightly porous, the case of your
computer
> would slowly equilibrate with the chamber, and could then suffer a
'reverse
> squeeze' at the end of the dive, possibly damaging seals, casing or
pressure
> sensor. This was the reason given to me when I was advised to remove my
> dive watch before going into a chamber - they had broken several in the
> past.
>
>

rnf2 wrote:
> So why don't they offer a shallow bowl of water so your computer or
> dive watch could sit in 2 or 3 inches of water during your dive?

When we 'dived' the DDRC there was this bucket....
The profile was quite different too.

nigelH
http://www.nigelhewitt.co.uk/stuff/ddrc.jpg

"rnf2" <rnf2@NOSPAMwaikato.ac.nz> wrote in message

> Oh I see... I didn't read the page until after the first post... they did
> offer a bucket of water but you just held on to yours.

Ok, I've slightly reworded that bit...they didn't offer us a bucket of
water.
This was due to us moving from the anti-chamber into the main section
once we had been blown down.

Chris


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