I have two single wall black stove pipes. These are seamless. Meant to slide into one another. One is a 4' the other is maybe 3'. They are meant to slip into one another and slide as to provide a slip joint. They are now pretty jammed together. They are somewhat tapered. I cannot seem to get apart. I have tied a couple ropes on them and pull to get them apart. A no go. I have not tried a comealong yet. Might do that. Before I scrap these and buy a new set. Probably $40 or more. Wondering if anyone has any ideas to pull apart.

Yes they have been used so there is a glaze on the inside.

Thanks if you have any suggestions.

quote:

Originally posted by old rugged cross:
I have two single wall black stove pipes. These are seamless. Meant to slide into one another. One is a 4' the other is maybe 3'. They are meant to slip into one another and slide as to provide a slip joint. They are now pretty jammed together. They are somewhat tapered. I cannot seem to get apart. I have tied a couple ropes on them and pull to get them apart. A no go. I have not tried a comealong yet. Might do that. Before I scrap these and buy a new set. Probably $40 or more. Wondering if anyone has any ideas to pull apart.

Yes they have been used so there is a glaze on the inside.

Thanks if you have any suggestions.

Are they single wall or double wall? Is there a screw(s) somewhere around the joint? You might try lightly tapping around the joint with a hammer to try and loosen it up .

If you have a heat gun, try heating up the larger pipe in the joint after while tapping gently on it with a rubber mallet. Either way, I would replace these with a good double wall pipe and be done with it. It will prevent getting burned too easily and reduce chances of a fire.

More info and a pic or two might be helpful. I’m not sure if the application from the description.

I'd use a short piece of broomstick, or 2x2, place the stick against the rim of the inside pipe, and tap with a hammer, working my way around the rim, until the piece comes loose.

Single wall pipe up to the transition box in the ceiling on my stove and they're probably creosoted together. Single wall should be cheap and it's probably not worth the trouble of trying to get them apart. a little judicious heat and some gentle tapping at the joint might loosen them up though.

This has "not worth the trouble" written all over it.

Perhaps inevitable trash...but first.
I'd get the rubber mallet and apply
increasingly enthusiastic shock
blows around the circumference of
the Junction point. Enough to distort
the seal without disrupting the
basic pipe shape. They are surprisingly
resilient up to a point.

Thanks guys, I agree with all of that. I will try a bit more today. If no go, will replace. I really appreciate it.

ok guys, here is an update. I tried a 1x2" piece of wood but just could not get enough of the lip to hit it hard enough. So grabbed a piece of 3/4"
sch. 40 black iron pipe. Worked around the diameter. Found one spot that the pipe stayed and could wack it pretty good. Slowly it moved. Kept at it and eventually it came out. It did roll over the lip of the pipe that was taking the brunt of the punishment. No big deal because I was going to shorten the pipe quite a bit anyways.
One I got the measurements right I got out the sawzall with a metal cutting blade and sawed it it off. Was not a perfect cut but was good and since this is a slip (slider joint) I have about 8" to work with. After cutting took a hand file and filed down the burs. Fits good and slides with some resistance but slides with ease. So I think I am good to reinstall. Hoping no smoke leaks. The draw should be strong.

quote:

Originally posted by jcsabolt2:
If you have a heat gun, try heating up the larger pipe in the joint after while tapping gently on it with a rubber mallet. Either way, I would replace these with a good double wall pipe and be done with it. It will prevent getting burned too easily and reduce chances of a fire.

Unless you're like the guy who used the most common type of double wall pipe (b-vent, used for gas fired equipment) on a wood stove.
The inner aluminum lining will not hold up to wood burning temperatures.

This single wall pipe is all legit wood stove pipe. Then goes in to metalbestos type pipe in a box and up through the attic space and up to the cap on the very top. The black single wall in from the stove up to the ceiling box.

Thanks guys I appreciate the thoughts and advice. You are the best!