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  #1  
Old 24-08-2007, 08:29 AM
wurzel wurzel is offline
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Default Hipflask tech question

My Pinder pewter hip flask has got squashed over the years. It now only holds about 2/3 the amount it should. I was planning on 1/2 filling it with ice water, closing the cap tightly and then putting it in a pan of water and bring ing to the boil in the hope the expansion of the air in the flask would pop the dent.

anyone ever done something like this before ?

By the way the dent is just a rounded squash of the outside of the curved flask it is not a creased dent if you know what i mean.
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Old 24-08-2007, 08:50 AM
Oobyscoot Oobyscoot is offline
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Why not fill it full to the brim with water and stick it in the freezer overnight.

Would have thought that would do it.
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Old 24-08-2007, 08:53 AM
wurzel wurzel is offline
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I thought about that but air expandes more than water freezing and I can sit and watch it in a pan, don't want to pop the seam to the neck, that is my worry which is why I am asking.

It is a nice flask my wife got me off merlin's stall at the Lion a month before we got married
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Old 24-08-2007, 08:56 AM
Oobyscoot Oobyscoot is offline
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Have you tried a foot pump or something like that.

That sould give you plenty of control over the expansion.
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Old 24-08-2007, 10:30 AM
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If you can get a seal then filling it with air of water and getting a few psi in to it should pop it out.
Gas is easier if you have access to some bottle of a inert gas via a regulator.
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Old 24-08-2007, 12:05 PM
wurzel wurzel is offline
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Hmm not thought of that, I'll check what the thread is and if I have ought that'll bodge to it
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Old 24-08-2007, 12:21 PM
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As it has sentimental value, keep it as it is, at least it still works, if you muck about with it you risk ruining the thread on the lid. My flask still has Benedictine from five years ago in it, can't even have a small drink when riding/driving these days, so I don't take it out anymore...John
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Old 24-08-2007, 12:25 PM
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Quote:
Originally Posted by wurzel
Hmm not thought of that, I'll check what the thread is and if I have ought that'll bodge to it
Should be easy to seal a thread,not talking huge pressure here,just get some plumbers PTFE tape and wind it on the thread,i used to pressure test rig pipe work for a living,used it thousands of times and it will hold no prob and does not cause damage.
You could possibly get away with rising main pressure but gas and a regulator is far easier to control.

Cannot see a problem.
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Old 24-08-2007, 12:31 PM
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I squashed my hip flash kneeling on it at a rally.To un-squash it I put some water in it then into the freezer overnight.The thing to do is not fill it up too much and risk knackering it.Just fill it say 3/4 full then try it.If it needs some more you can always add a bit more water and try again.
However,once I tried this method with a dented petrol tank.It got the dent out nicely,but also sqashed the tunnel out underneath,so it wouldn't go back on the frame
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Old 26-08-2007, 09:58 AM
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Quote:
Originally Posted by lowrider
If you can get a seal then filling it with air of water and getting a few psi in to it should pop it out.
Gas is easier if you have access to some bottle of a inert gas via a regulator.
stick it up yer arse coat
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Old 26-08-2007, 10:19 AM
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Quote:
Originally Posted by bunbag
stick it up yer arse coat
I tried that with mine......but somehow it never tasted the same afterwards.. John
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Old 27-08-2007, 07:24 PM
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Default air vs water

thing is, air is compressable, whereas water isnt, so you could put water in it and freeze it or boil it, but as the water expanded, the air may well just compress. but filling it completely with water the water isnt compressable, so the expansion might remove the dent. however, you may need to remove the top whilst its still boiling or frozen and then allow it to col down/defrost, then fill it again and repeat till its got back to its correct volume.
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Old 27-08-2007, 07:34 PM
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Quote:
Originally Posted by trophydave
I squashed my hip flash kneeling on it at a rally.To un-squash it I put some water in it then into the freezer overnight.The thing to do is not fill it up too much and risk knackering it.Just fill it say 3/4 full then try it.If it needs some more you can always add a bit more water and try again.
However,once I tried this method with a dented petrol tank.It got the dent out nicely,but also sqashed the tunnel out underneath,so it wouldn't go back on the frame
If I ever found a petrol tank in my freezer there would be trouble for sure
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Old 27-08-2007, 08:36 PM
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fill it with weed killer and sugar, throw it on bonfire and run like f**k. that`ill sort the dent out. lol
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Old 27-08-2007, 09:48 PM
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Quote:
thing is, air is compressable, whereas water isnt,
Really,i must have spent years pressure testing pipe work and its welds not using a high pressure water pump.


Both are compressable but they do so at differing rates.
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Old 27-08-2007, 10:16 PM
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Quote:
Originally Posted by lowrider
Really,i must have spent years pressure testing pipe work and its welds not using a high pressure water pump.


Both are compressable but they do so at differing rates.

water isnt compressable! you might be able to put it under pressure, but thats a different thing altogether. if you have a litre of water, then its going to displace a litre. no amount of compressor technology is going to make that litre displace anything less than 1000cc. you might be able to make it contract by cooling it to a precise figure(i think that 4degrees c is the figure, but its been a while so im prepared to be wrong on that) but there is no way that you can compress water to take less space. if you put a litre of water under pressure, its still a litre. whereas if you put a litre of air under pressure, then you can compress it down to a fraction of that figure, indeed ultimately you could compress oxygen till it became a liquid, but the liquid couldnt then be compressed, only put under more pressure.
or was i asleep during that day at tech?
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Old 28-08-2007, 09:17 AM
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Give that man a Mortar Board!
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Old 28-08-2007, 09:29 AM
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Yeah but in THIS case the water will be under pressure and try to escape via the walls of the flask,hence to do the job.
I could stand and argue the tech aspects of pressure re temp changes,didn't learn mine at tech but on the job,but in this case it wouldn't be relevant.
Didn't see much point of going deeper into a subject that was of sod all interest to most on here.
In lay mans term,applying pressure to the job will extert pressure on the walls of the flask and do the job.
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Old 28-08-2007, 09:38 AM
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Default pipes

if you can compress water, then i think the scientific community has a nobel prize with your name on it!! if you dont get the difference between pressurising and compressing, then i wouldnt want you testing any of my pipework!
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Old 28-08-2007, 01:47 PM
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Quote:
Originally Posted by johnr
if you can compress water, then i think the scientific community has a nobel prize with your name on it!! if you dont get the difference between pressurising and compressing, then i wouldnt want you testing any of my pipework!
Yes dear and i wouldn't want a book man on the job.

I stress,in general terms.
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  #21  
Old 28-08-2007, 02:12 PM
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Bah

You Men!

I too have a pewter hip flask that is dented, & I don't particularily care about !
:-)


I will go stick water in it, and bung in freezer & let you know.

I will even do before & after shots & maybe it will find its owner again
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Old 28-08-2007, 05:04 PM
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Never been a fan of hip flasks.
Don't know why.
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Old 28-08-2007, 11:05 PM
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[QUOTE=lowrider]Yes dear and i wouldn't want a book man on the job.
QUOTE]

never heard that saying before, whats it mean?
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Old 28-08-2007, 11:15 PM
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Quote:
Originally Posted by lowrider
Really,i must have spent years pressure testing pipe work and its welds not using a high pressure water pump.


Both are compressable but they do so at differing rates.
Water is compressible, but not muc

Quote:
Water is a good hydraulic fluid from a physics standpoint, but not necessarily good from an engineering (practical) standpoint.

Water is almost incompressible, though it can actually be compressed. At a tremendous pressure of 1000 kg per square centimeter (which isn't strictly a pressure, but is listed that way in Smithsonian Physical Tables) water compresses by only 2.5% at 50 degrees C.

Water actually can be used as a hydraulic fluid in situations where it doesn't matter that it evaporates easily, if the components of the hydraulic system don't corrode easily, and if the temperatures in the system are low enough that the water won't boil. Due to these material considerations (volatility, corrosion, and temperature) most hydraulic systems use oils of various kinds.

John Link, MadSci Physicist
Source: http://www.madsci.org/posts/archives...8097.Ph.r.html

So Johnr is right in the context of what he is saying as that sort of pressure is not really viable.
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Old 28-08-2007, 11:18 PM
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[QUOTE=johnr]
Quote:
Originally Posted by lowrider
Yes dear and i wouldn't want a book man on the job.
QUOTE]

never heard that saying before, whats it mean?
I think it means that the man on the job knows more about physics than those who study it.

Unfortunately, doing your job does not generally qualify you to talk with any authority on the physics of the job - unless you are a physicist of course.
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Old 28-08-2007, 11:25 PM
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physics? nah, pipefitter and gas engineer me.
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Old 28-08-2007, 11:26 PM
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Quote:
Originally Posted by Abb

So Johnr is right

gonna print it out and frame that one!!
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Old 28-08-2007, 11:30 PM
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Quote:
Originally Posted by johnr
physics? nah, pipefitter and gas engineer me.
Indeed - and it's worth bearing in mind that 1 molecule of water is larger than 1 molecule of natural gas, hence the gas can escape through a hole that water never will, under any pressure, without enlarging the hole.
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Old 28-08-2007, 11:30 PM
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Quote:
Originally Posted by johnr
gonna print it out and frame that one!!
Selective editting works wonders eh John?
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Old 28-08-2007, 11:36 PM
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Quote:
Originally Posted by Abb
Indeed - and it's worth bearing in mind that 1 molecule of water is larger than 1 molecule of natural gas, hence the gas can escape through a hole that water never will, under any pressure, without enlarging the hole.
well my pipework never leaks so i cant possibly speak with authority on the subject!
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