OT - it is about crabs

"~^ beancounter ~^" wrote in message
oups.com...
isn't each athosphere of water, like 12 lbs...
and it measures, like 6 x 6 feet...or something
like that.....anyway it might be 6,000 / 6 feet x
12 lbs.....12,000 foot lbs (est?).......

Pressure in water increases at the rate of about 3 atmospheres for every one
hundred feet of depth. Thus, at 6000 feet, the pressure is (60 x 3 x ~14.7)
+ ~14.7 pounds per square inch = ~2660.7 psi. The extra ~14.7 is the
pressure exerted by the actual atmosphere. On the page that started all
this, they rounded it up to 2700. Close enough.

Wolfgang

Wolfgang wrote:

Yeah, we've been over this ground. What's your best guess as to the value
of the "pressure of the atmosphere" at a depth of about 6000 ft. below the
surface in the open ocean?

It's one atmosphere plus whatever correction you need for another 6000
feet of air column.

--
Cut "to the chase" for my email address.

Wolfgang wrote:
"Jeff Marso" wrote in message
...
"Wolfgang" wrote in
:

What I find curious is the assertion that pressure inside the pipe is
0 psi. Why (and how, for that matter) would someone generate and
maintain a vacuum in a pipeline at that depth and pressure?

The site says it's PSIG not PSI.

from:
http://www.unc.edu/~rowlett/units/dictP.html

"psig is a symbol for pound per square inch gauge; this means that the
pressure has been read from a gauge which actually measures the difference
between the pressure of the fluid and the pressure of the atmosphere"

Yeah, we've been over this ground. What's your best guess as to the value
of the "pressure of the atmosphere" at a depth of about 6000 ft. below the
surface in the open ocean?

Wolfgang

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.
As to the pipeline atmospheric pressure is trivial. 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.
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. 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.

"rw" wrote in message
m...
Wolfgang wrote:

Yeah, we've been over this ground. What's your best guess as to the
value of the "pressure of the atmosphere" at a depth of about 6000 ft.
below the surface in the open ocean?

It's one atmosphere plus whatever correction you need for another 6000
feet of air column.

Really? Why?

Wolfgang
the boy just WILL NOT learn.......that's why he's fun!

it looked pretty quick, to me...it probabally
too the crab a few mnts. to fig. out what
happined......(i'm guessin')...


"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."

On 24 Oct 2005 10:55:50 -0700, "~^ beancounter ~^"
wrote:

isn't each athosphere of water, like 12 lbs...
and it measures, like 6 x 6 feet...or something
like that.....anyway it might be 6,000 / 6 feet x
12 lbs.....12,000 foot lbs (est?).......

The pressure is being measured inside a pipe, presumably connected at both ends
to a point at or above sea level. The pressure of the water outside the pipe (or
an 'atmosphere' of air at that depth) isn't a factor until the pipe is cut.
--
Charlie...
http://www.chocphoto.com

every 33 ft...so 6,000 / 33 ft = 181.81 @ 14.7 lbs
per sq inch for around = 2,672.607 lbs per sq in
@ 6,000 feet...

-----------------snip------------------------------------
Atmosphere unit of measurement for pressure exerted upon an object or
person. The pressure exerted by the atmosphere at sea level is equal to
the pressure exerted by 33 feet of seawater. Thus, at a depth of 33
feet there is one atmosphere (atm) of water pressure. At 66 feet, there
are two atmospheres of water pressure, etc.

Atmospheric Pressure the pressure exerted by the earth's atmosphere at
any given point at sea level; one atmosphere equals 14.7 pounds per
square inch (psi).

"BJ Conner" wrote in message
oups.com...

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

Wolfgang wrote:
"BJ Conner" wrote in message
oups.com...

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

This fellow from Illinois is driving thu Winconsin So this guy is
driving down the high and passes an orchard and sees this farmer
holding up a pig so that it can gobble apples right off the tree. The
pig is going crazy eating apples.

"That's the craziet thing I ever saw," the guy tells himself and he
pulls over to the side of the road, gets out of the car, and goes up to
the farmer.

"Hey, I couldn't help noticing what you were doing. Does your pig like
apples?"

The farmer says, "My pig loves apples."

"Well, if you don't mind my saying so, if you took a stick and knocked
the apples on the ground instead of lifting the pig up, you would save
lots of time."

And the farmer answers, "What's time to a pig?"

"BJ Conner" wrote in message
oups.com...

"What's time to a pig?"

stevie? Can you supply the correct answer?

Wolfgang
who knows the value of primary sources.