Contest question

[Shellback]

After this question is answerd correctly there will be a drawing for a beautiful Sapphire, this is a georgous stone someone is going to be very lucky winning this.

If you have a 4" pipe standing up 35' tall full of water what will be the pressure at the bottom of the pipe?? :eek:
Good Luck
Tim

[USMC-03]

It'd been a long time since my my thermodynamics class, but…

According to the Water Data table, page 23 in the Cameron Hydraulic Data book (Ingersoll-Rand, 1942) the static pressure of water with 35 feet of head is 15.16 lb/sqin.

Pressure (of water in lb/sqin) = .4331 x Height (in feet)

[jjmitchell60]

While I could answer this question with a bit of help from my books, yes I took Thermo as well adn have a degree in Physics for one of my 3 degrees; I will opt out of this one being I would theOpal. I will say this for Shellback, the opal he sent me is one NICE stone and my wife is itching for a setting spo she can war it. being this month is her birthday, I probably will have it set in a ring here soon for her so who ever wins this is winning a nice stone no doubt IMHO.

Do not forget the affects of gravity as well as the volume of the pipe on your calculations, I will give that hint.

[USMC-03]

…yes I took Thermo as well adn have a degree in Physics for one of my 3 degrees...

Good deal jj. I have a degree in engineering (not that I use that part of my education much) as well as business. I'm hoping to start graduate school next year; going for the full frontal lobotomy…

Do not forget the affects of gravity as well as the volume of the pipe on your calculations, I will give that hint.

As I recall, considering the area and/or volume of the pipe would be required for force and not pressure. Am I correct? It's all fuzzy anymore.

[Shellback]

Ok here is a hint, it is much easier then you guys are making it :D
Tim

[Texman]

The height of the pipe is inmaterial,, the depth of the water is all that matters.

[Shellback]

The height of the pipe is inmaterial,, the depth of the water is all that matters.

Actually the height of the pipe is what matters since it makes the depth of the water..
Tim

[Shellback]

While I could answer this question with a bit of help from my books, yes I took Thermo as well adn have a degree in Physics for one of my 3 degrees; I will opt out of this one being I would theOpal. I will say this for Shellback, the opal he sent me is one NICE stone and my wife is itching for a setting spo she can war it. being this month is her birthday, I probably will have it set in a ring here soon for her so who ever wins this is winning a nice stone no doubt IMHO.

Do not forget the affects of gravity as well as the volume of the pipe on your calculations, I will give that hint.

I will say as well listen to JJ he is on the right track:D:D
Tim

[Texman]

Actually the height of the pipe is what matters since it makes the depth of the water..
Tim


umm,, not trying to start an argument, but the major pipe is 35 ft and the 4 in one sits in the bottom? is that correct so far? ok, the weight of the 35 ft of water completely determines the weight ( pressure) at the bottom, doesn't matter if it is inside or outside the 4 " pipe. http://joanongovernment.homestead.com/files/image019.gif

[TranterUK]

This thread reminded me of a flight from Rio in Brasil to the UK twenty odd years ago. The guy sitting next to me showed me his jewel encrusted Rolex and said his name was biblical and started with a J, if I could guess it in three tries the watch was mine.

I never got the watch.

Interestingly he came from a town in Brasil called America, or similar. It was established after the US Civil war by soldiers of the confederacy who did not want to stay in the US, and so re settled there.

[Shellback]

You have a 4" diameter pipe 35' tall full of water, what is the Pounds per square inch (PSI) at the bottom of that pipe?
Tim

[Shellback]

This thread reminded me of a flight from Rio in Brasil to the UK twenty odd years ago. The guy sitting next to me showed me his jewel encrusted Rolex and said his name was biblical and started with a J, if I could guess it in three tries the watch was mine.

I never got the watch.

Interestingly he came from a town in Brasil called America, or similar. It was established after the US Civil war by soldiers of the confederacy who did not want to stay in the US, and so re settled there.

This is not a trick or loaded question at all and you will get the "watch" so to speak, everyone who has won my contest's gets a impressive prize, I just do it for the fun of it. It just has to be our members of TFF.
Tim

[SolidVFR]

What is the temperature? Are we at sea level?

[SolidVFR]

~16psi?

Just kinda guessing over here.

[Crpdeth]

You have a 4" diameter pipe 35' tall full of water, what is the Pounds per square inch (PSI) at the bottom of that pipe?
Tim

Inside diameter?

Crpdeth

[millwright]

Sea Water or Fresh - or something else ?

I see someone else has already referenced the "Bible Of Hydraulics" I-R's Cameron Hydraulic Data Manual.....which will give the correct answer in psia, psig, ft. and inches.
Worked for that division for years..... >MW

[USMC-03]

Ok, Shellback, are you talking pressure or force?

[358 winchester]

about 290 psi :confused:

[Texman]

Ok, I had to ask someone and picked a Semi-Retired International Oil Drilling & Logistics Consultant, and his answer is 15.1606 psi

[Shellback]

Ok, Shellback, are you talking pressure or force?

Pressure per square inch (PSI) no one has the answer yet, someone has to know this, where is our Teacher Mr. Pistolenschutze :D
Tim

[lead]

Is it lead pipe, or PVC? Is the water pure, or full of chemicals?
Oh well, my guess is 46.

[flannelman]

The pressure is equal to the specific weight of water multiplied by the height.

P=(62.4lb/ft^3)*(35ft)*(12in/1ft)=182lb/in^2

[Marlin T]

I don’t have a clue, but VFR asked what I was going to. Temp and barometric pressure are two variables that would affect the outcome.

[Shellback]

I don’t have a clue, but VFR asked what I was going to. Temp and barometric pressure are two variables that would affect the outcome.



True but not to the extent you might think. Try a search of water column may be very helpful.:) This is useful info.
Tim

[SolidVFR]

OK, well you've stumped me(that wasn't too hard:)). I'm still guessing just over 16psi.

[CampingJosh]

Just a dab over 15 psi? Like 15.1 or 15.2?

[Indian Creek 1]

After this question is answerd correctly there will be a drawing for a beautiful Sapphire, this is a georgous stone someone is going to be very lucky winning this.

If you have a 4" pipe standing up 35' tall full of water what will be the pressure at the bottom of the pipe?? :eek:
Good Luck
Tim

15.155 PSI

[sluggermn]

ok here is my edjimucated guess.

110755.2 lbs

if i am right I will be totally suprised!

slugger

[Shellback]

Ok no one gott the correct answer, the answer is 17 1/2 psi. .5 or 1/2lb per foot water column. :p

[jpmccr]

Should be about 15.19 psi. FD hydraulics question.
PSI = H x .434

[Shellback]

Should be about 15.19 psi. FD hydraulics question.
PSI = H x .434

Uniform Plumbing Code 2003, water distribution section, DWV testing and general knowledge, usefull tables, all in the Uniform Plumbing Code. This is good to know if you are building a cabin and taking water from a spring, you will know how high to put your tank above the cabin to get a good working pressure. Cities use this formula for water towers, we all see them. this may be usefull to someone here one day:).
Tim

[USMC-03]

Should be about 15.19 psi. FD hydraulics question.
PSI = H x .434

Your formula is correct jpmccr. I've got P = .4331 x H or P = 15.16. Close enough. Now, if we were to also consider atmospheric pressure at sea level, then yes it would be slightly more.

[Texman]

The pipe diameter has no effect on the bottom pressure.
A 4in or 4ft in diameter will give you the same psi at the bottom of the pipe.
The only variable is height.
1 foot of water,(height) regardless of volume or pipe size, will exert a static pressure of 0.43274495394500617psi on the bottom.
So, for 35 ft= 35 X 0.43274495394500617= 15.1460734psi

[SolidVFR]

The pipe diameter has no effect on the bottom pressure.
A 4in or 4ft in diameter will give you the same psi at the bottom of the pipe.
The only variable is height.
1 foot of water,(height) regardless of volume or pipe size, will exert a static pressure of 0.43274495394500617psi on the bottom.
So, for 35 ft= 35 X 0.43274495394500617= 15.1460734psi

0.43274495394500617 * 37ft = 16.012

[jjmitchell60]

USMC-03 posted:
Good deal jj. I have a degree in engineering (not that I use that part of my education much) as well as business. I'm hoping to start graduate school next year; going for the full frontal lobotomy…

I have been accepted to grad school in any of my 3 diciplines; History, Math, or Physics BUT due to a motorcycle wreck in 91, my back will not allow me to stand the commute to school every day. I own too much land to sell out and move there plus lan dnear the school is 5 times what it is here. I own 187 acres here, there that would maybe buty me 5 acres out of what teh sell of the 187 would get me. I ratehr have my land to hunt on as to put up woith that rat race of Grad School. I actually had plans of getting my Phd in all 3 but as the say, best laid plans of mice and men...! I advice everyone to get as much schooling as they can however do not let the schooling rule your life if you have to get loans. That can be a life sentence.

By teh way, I actually began as an Electrical Engineer major!

[USMC-03]

USMC-03 posted:


I have been accepted to grad school in any of my 3 diciplines; History, Math, or Physics BUT due to a motorcycle wreck in 91, my back will not allow me to stand the commute to school every day. I own too much land to sell out and move there plus lan dnear the school is 5 times what it is here. I own 187 acres here, there that would maybe buty me 5 acres out of what teh sell of the 187 would get me. I ratehr have my land to hunt on as to put up woith that rat race of Grad School. I actually had plans of getting my Phd in all 3 but as the say, best laid plans of mice and men...! I advice everyone to get as much schooling as they can however do not let the schooling rule your life if you have to get loans. That can be a life sentence.

By teh way, I actually began as an Electrical Engineer major!

EE's are in very high demand right now. I never could wrap my hear around it though. I like the smell of machine and welding shops anyway.

I've been admitted into a local MBA program and just waiting to figure out the funding. With some luck I'll be able to have most of it paid for on the new GI Bill so I may be waiting until next September. I might as well leach off the tax payer too as long as everyone else is...

I'm also look at a PhD program, more for an accomplishment than a career builder. I love Piling it Higher and Deeper anyway...

[Shellback]

You've earned the right to leech off us tax payers, and this tax payer feels all of us owe you a hell of alot more.;) Thank for your service to us.
Tim

[Shellback]

The pipe diameter has no effect on the bottom pressure.
A 4in or 4ft in diameter will give you the same psi at the bottom of the pipe.
The only variable is height.
1 foot of water,(height) regardless of volume or pipe size, will exert a static pressure of 0.43274495394500617psi on the bottom.
So, for 35 ft= 35 X 0.43274495394500617= 15.1460734psi

Plumbers are obviously not that technical put a gauge at the bottom and I guarantee you will get 17 1/2 lbs PSI, I do it several time a week, how do you think I came up with the question, I was testing underground plumbing where we have to put 10' of head to equal 5 psig. In the winter we air test it must be 5 lbs PSIG because it wil freeze and burst the pipe:p.
Tim

[Popgunner]

From my days of SCUBA diving I'm trying to remember about atmospheres. Would the water be about two atmospheres (14' of water per atmosphere+-) and then would you have to add the weight of the atmosphere of the air column above the water at sea level? Am I totally wet?:D

[jjmitchell60]

03, That is whay my youngest sibned up for 6 byears in the Air Force. he is taking the Air Crypto Linguist field. has a 63 week Tech Schol in Monterey C, otehr bschooling in Washington state and Texas, then jump school in Fort Benning, and then eitehr Germany or England as his duty station. He does not caare which but is hoping on England. Dare say if he does, I will see if Tranter can give him maa run down of what to see in London and otehr parts of the British Isles. I plan on visiting him over seas if i live long enough. He wants to be aan archeologists so he figured why not let the military pay bteh way. They have a POW/MIA program that if he gets degrees in archeology and/or anthropology; he canb get one with them looking for remains from WWII, Korea, and Vietnam. he said that is right up his alley but the Air Crypto Linguist gets the better assignsments. He will be in Monterey learning Aribic or Chinese (probably arabic IMHO) and he has already put in fpor volenteet assignments as some combat positions.

Like others I say you deserve to let the US pay for your schooling. I was in teh Navy during teh Cold War. My war was no where near as bad as yours. We just sat and listened or sat ready to pop up from undeer the ice and deliver our load. Boring but peaceful. The new GI Bill has a LOT more for education thankfully. your family can even share in the benefits as I understand the new bill.

As to EE, computers and such came natural to me but then again they all work off math and I switched ovr to math as my first degree. math is teh universal language. You can communicate with anyone using just math IMHO.