Re: OT - it is about crabs


"BJ Conner" <oakiefisher@xxxxxxxxxxx> wrote in message
news:1130177783.012692.155870@xxxxxxxxxxxxxxxxxxxxxxxxxxxxxxx
>
> Between Mad Cow Disease and CRS I am not sure but I believe I have read
> the atmoshperic pressure in one of the gold mines in South Africa was
> twice atmoshperic and the mine was 10,00 feet deep. There are some
> studys on it relating to nitrogen absorbtion. There recent because
> untill recently no one gave a rats ass about any of the miners there.
> Life wasn't ( and probably still isn't) great being a miner there.
> I am sure somewhere there is a standard atmospheric table that goes
> down that far. The Homestake mine in South Dakota is 2 miles deep, you
> could take your baraometer on you next visit.

I think I'll pass on the mine visit, but it would be interesting to find out
how quickly atmospheric pressure increases with depth. Even more
interesting is the idea that nitrogen absorption might be a problem. When I
was scuba diving back in the late 60s and early 70s we never concerned
ourselves about it at 2 atmospheres.....with less than an hour of bottom
time, it simply wasn't an issue.

> As to the pipeline atmospheric pressure is trivial.

Agreed. Tell stevie. :)

> Changing the
> elevation of the pipe 33 ft is equavalent to one atmosphere.
> Differential pressure inside/outside is still about 2,650 PSIG.
> I am not sure they use nitrogen in pipelines or not, it would take a
> lot of nitrogen. Then again air mixed with a little left over gas can
> explode resulting in an expensive repair.

Yeah, the potential ignition occurred to me shortly after I asked why they
would use nitrogen. It would indeed take a lot of it to evacuate a pipeline
of any significant length, but nitrogen is pretty cheap....a LOT cheaper
than an explosion, I'd guess.

> I don't get the oil and gas journal anymore but there was some problems
> with metahl hydride or similar compound forming in cold high pressure
> gas piplines. Methal hydrieds are the methane crystals that form
> naturally in the sea.
> The real question is about time. That little slit in the pipe is like
> a black hole. Did time change for the crab? Did it take it "forever"
> to be digested by the hole.

Crabs generally move pretty slowly. Seems to me that insofar as they are
aware of time at all, they'd probably take a fairly leisurely view of it.
Looks to me like the event was probably over before the crab had time to
contemplate it.

> It may not be realtive and time to a crab
> may be like time to the pig the cheesehead was holding up to eat the
> apples off the tree.

Well, we likes our bacon......and very few expend the time or the effort to
ask the pig's opinion. :)

Wolfgang


.

Relevant Pages

  • Re: OT - it is about crabs
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  • Re: OT - it is about crabs
    ... pressure is going to be a very short one. ... Even at ground level and low pressures pipe that size would have a wall ... crab gets across the cut with no apparent difficulty before the whole thing ... And then it disappears in large chunks. ...
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