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Old 12-19-2009, 04:49 PM   #1
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Default DENT IN PIPE. Frozen water trick?

I heard one time that you can sometimes pop a dent out in a pipe by filling the pipe up with water, closing off any open holes and then putting it in the freezer. The expanding water will then move the metal.

Is this true? I want to try it if it works. Any special way to block off open holes for a water tight seal?

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Old 12-19-2009, 05:22 PM   #2
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i know a guy who did that and split the pipe
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Old 12-19-2009, 05:56 PM   #3
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Default Tighht seal..

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Originally Posted by BIGTACO View Post
I heard one time that you can sometimes pop a dent out in a pipe by filling the pipe up with water, closing off any open holes and then putting it in the freezer. The expanding water will then move the metal.

Is this true? I want to try it if it works. Any special way to block off open holes for a water tight seal?

The extremeties will freeze over quicker and seal it for you, so not entirely necessary. I doubt you'll fix one this bad though..

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Old 12-19-2009, 05:58 PM   #4
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Very possible.

I did some research. Water expands at a total of 9% its volume when it freezes.

So I can determine the volume of the pipe without the dent. Then determine what volume of water to put into the pipe to get to just over that volume. This will require that the entire pipe not be totally filled. If I have done my calculations correctly I will have left out just enough water so that when the water is frozen it expands to take up the space in the pipe to pop out the dent but not split the pipe.

Wish me luck on this journey. It is treaturous I know. But, I am feeling lucky.
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Old 12-19-2009, 05:59 PM   #5
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Default And do it more than once..

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Originally Posted by BIGTACO View Post
Very possible.

I did some research. Water expands at a total of 9% its volume when it freezes.

So I can determine the volume of the pipe without the dent. Then determine what volume of water to put into the pipe to get to just over that volume. This will require that the entire pipe not be totally filled. If I have done my calculations correctly I will have left out just enough water so that when the water is frozen it expands to take up the space in the pipe to pop out the dent but not split the pipe.

Wish me luck on this journey. It is treaturous I know. But, I am feeling lucky.
cheers..

h
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Old 12-19-2009, 06:02 PM   #6
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I have personally done this under the watchful eyes of a pro. It works. Make sure you have all three holes very tightly capped, and put it in the freezer upright, wait until it freezes solid. It took two go rounds for it pop out a very badly bent up pipe.
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Old 12-19-2009, 06:15 PM   #7
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I have done this to more than one pipe, works great. Seal up the holes and freeze over night. Might take a couple of times like said earlier but works.
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Old 12-19-2009, 06:48 PM   #8
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The success of this process depends on the severity of the dent. Deep creases will not pop out but pop dents will come out nicely. I have done it a number of times but I believe that the process also expanded the overall volume of the pipe and therefore affected the tune. BTW, go to your local hardware store and you can buy tapered rubber plugs that can fit the openings at the rear and exhaust exit. As for the return pressure niple, insert a round tooth pick and clip it off with enough outside length that you can remove it later.

Another item to use for plugs are wine corks. Way more fun getting ready. LOL.... You will need to shave them down to fit the openings.

Good Luck,
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Old 12-19-2009, 08:24 PM   #9
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you could pull the dent with a small slide hammer,then tig the hole
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Old 12-19-2009, 09:10 PM   #10
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you should do this when you have alot of time to spend at home, i would not leave it overnite it might ruin the pipe. after three hours you should start to check every 20 minutes and when the dent is gone remove it
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Old 12-19-2009, 09:24 PM   #11
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+1 on checking it every hour or so i have done it but a few times i forgot and it ballooned the pipe
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Old 12-19-2009, 10:35 PM   #12
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It requires couple of times of re doing it. As many as 5 times.

Let the pipe defrost 80pct and put it back in freezer again. Repeat this procedures until the dent become less obvious. Add water if you think necessary. Sealing the stinger is the most difficult part. I suggest to use rubber ballon party and rubber bands to seal any openings.

The problem with ice freeze method : the shape actually change to fatter + rounder on the first and second chamber section.

If the pipe is badly damage ( already crushed like banana ).... ice freeze won't work.
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Old 12-19-2009, 11:23 PM   #13
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Put some garden hose clamps arround it so some parts will not expand to much and so it will concentrate more to the bend part
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Old 12-20-2009, 03:01 AM   #14
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Suggest that you use full fat milk instead of water. Water is very aggressive with high volume expansion. Semi skimmed or skimmed milk is useless.

Using milk, pipe can be left in freezer overnight. Do not seal everything super tight as you need somewhere for it to give and it is much better than a split.

Also don't try to remove the dent in one cycle. Many cycles are sometimes necessary and if it starts like a banana, believe me it will still end up like a banana!

Good luck.
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Old 12-20-2009, 06:42 AM   #15
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I also have done a few pipes by freezing. Block holes, put in freezer standing up. Over nite works well. It may need to freeze a few times to get the dent out.
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