E
ecowarm
can we do t in 2" with the hand dies please
Discuss Sciencey odd question just occured in my daily musings... in the Plumbing Jobs | The Job-board area at PlumbersForums.net
If there is no friction then there are no friction losses so the pressure remains constant
if your talking about a pipe in outer space their wouldnt be any pressure and if you opened each end water wouldnt flow anywhere, it would stay still, untill someone moved it, using a force of pressure or gravity moved the water down..
Ah, but we are now back on earth (post 59) so subject to the usual forces :lol:
NO there is no gravity in space therefore the water would be weightless
Well I'm still a bit confused but I think the answer is too many other factors would get in the way of the experiment.
I suppose what I want to imagine is say you are on this magical world for this experiment - you have this level stretch of 1000 miles of pipe, which is not effected by friction, is neither subject to the effects of gravity nor the effects of no gravity, where the only thing being tested, somehow - magically - is whether the mass of this water itself can hold back pressure when applied.
So this pipe would be full of water but not pressurised. Just at the pressure it normally would be at. At the far end is a tap which will be opened shortly. Then, 1000 miles back the other away is a valve which is closed. On the other side of the valve is more pipe, containing water which is pressurised to 1.5 bar. If you open the valve the pressurised water comes into contact with the non-pressurised water, sitting there for it's 1000 mile stretch - if you then open the tap 1000 miles away does water come out or not?
not answerd yet dont forget if a pipe is a 1000 miles long layin on a planet, the natural curvature of the planet will allow air in when you open the pipe allowing the water to pour out
no, the weight of water would be too much for 1.5 bar to overcome it
do you have 25 mile of copper on the van?
diamondgas wants to do it in speedfit, but i think thats cheating, in fact ive decided hes a big wuss now and i o longer consider him a real plumber, psss, dont tell him
how about doing it in iron? ive got some hand dies
And this covers a lot of useful stuff but doesn't quite anwswer the question
Domestic water-supply system - theory - JohnHearfield.com
this chap does know Renolds
Soooo.....what we want to know is, how long would a piece of 15mm copper full of water need to be when subjected to 1.5 bar before water couldn't come out of the other end but ONLY because the weight of the water in said pipe would be too great for it to be pushed out by available pressure?
I've done the calculations and its 643.274653 miles. No need to check, 100% accurate, absolutely.
I have'n got a finger big enough for iron fuzzy and i am a wuss .... Part time plumber full time gas engineer :rofl: Haven't got a clue when in comes to anything waste related and have never fancied messing with toilets, baths and the like... leave that to the proffesionals lol ...
its all very clear now, so how far would gas travel if subjected to a force of 1.5bar in a 15mm copper tube?
Up hill, down or on the level? I'd be gettn' the meter gov checked if I was getting that sort of presure ... imagine the cooker flame!!! lol
I couldn’t let the challenge of this question leave my head
I think the friction is irrelevant and I think the amount of water in the pipe needs to be big enough to be exerting and equal and opposite force to the mains pressure
I may have the answer found in a plumbing book as to when the 3 bar of mains pressure runs out, I could be very wrong.
Please check my maths I may have made massive mistakes.
Townsend Plumbing 1 second edition 1969
Pages 51-3 chapter about water.
If we assume water pressure of 3 bar = 30 m head
And 15mm pipework
Intensity of pressure = head x 9.8 kilo Newton kN/m2
= 294 kN/m2
Total pressure = intensity of pressure x area
Total pressure = 294 kN/m2 x (3.142 x 7.52) m2= 51,961 kN
1 tonne of force = 1000 kg f = 9800 newtons = 1m3 of water
Therefore:
51,961 / 9.8 = 5,302 tonnes = 53,020m3 or 53 million litres of water
I think this means that 3 bar mains water pressure is enough to move 5,302 tonnes of water through a 15mm pipe
A litre is 1cm3 of water and if this pipe hold 0.15 litres per metre then 150 litre per km
At this point I have lost interest and Big Bang has come on TV … come on I’m nearly there.
353,467 kilometres of pipe filled with water.
By the way, circumference of the earth is a little over 40,000. so to all practical terestrial purposes the water will never stop coming.
I couldn’t let the challenge of this question leave my head
I think the friction is irrelevant and I think the amount of water in the pipe needs to be big enough to be exerting and equal and opposite force to the mains pressure
I may have the answer found in a plumbing book as to when the 3 bar of mains pressure runs out, I could be very wrong.
Please check my maths I may have made massive mistakes.
Townsend Plumbing 1 second edition 1969
Pages 51-3 chapter about water.
If we assume water pressure of 3 bar = 30 m head
And 15mm pipework
Intensity of pressure = head x 9.8 kilo Newton kN/m2
= 294 kN/m2
Total pressure = intensity of pressure x area
Total pressure = 294 kN/m2 x (3.142 x 7.52) m2= 51,961 kN
1 tonne of force = 1000 kg f = 9800 newtons = 1m3 of water
Therefore:
51,961 / 9.8 = 5,302 tonnes = 53,020m3 or 53 million litres of water
I think this means that 3 bar mains water pressure is enough to move 5,302 tonnes of water through a 15mm pipe
A litre is 1cm3 of water and if this pipe hold 0.15 litres per metre then 150 litre per km
At this point I have lost interest and Big Bang has come on TV … come on I’m nearly there.
353,467 kilometres of pipe filled with water.
By the way, circumference of the earth is a little over 40,000. so to all practical terestrial purposes the water will never stop coming.
I couldn’t let the challenge of this question leave my head
I think the friction is irrelevant and I think the amount of water in the pipe needs to be big enough to be exerting and equal and opposite force to the mains pressure
I may have the answer found in a plumbing book as to when the 3 bar of mains pressure runs out, I could be very wrong.
Please check my maths I may have made massive mistakes.
Townsend Plumbing 1 second edition 1969
Pages 51-3 chapter about water.
If we assume water pressure of 3 bar = 30 m head
And 15mm pipework
Intensity of pressure = head x 9.8 kilo Newton kN/m2
= 294 kN/m2
Total pressure = intensity of pressure x area
Total pressure = 294 kN/m2 x (3.142 x 7.52) m2= 51,961 kN
1 tonne of force = 1000 kg f = 9800 newtons = 1m3 of water
Therefore:
51,961 / 9.8 = 5,302 tonnes = 53,020m3 or 53 million litres of water
I think this means that 3 bar mains water pressure is enough to move 5,302 tonnes of water through a 15mm pipe
A litre is 1cm3 of water and if this pipe hold 0.15 litres per metre then 150 litre per km
At this point I have lost interest and Big Bang has come on TV … come on I’m nearly there.
353,467 kilometres of pipe filled with water.
By the way, circumference of the earth is a little over 40,000. so to all practical terestrial purposes the water will never stop coming.
Fuzzy - exactly the oppositsee if i got this, if you have 353,467km of 15mm tube, 3 bar is sufficient?
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