View Full Version : What tool/machine "flared" this pipe?

01-24-2013, 12:58 PM
These are called crush sleeves. They insert them inside fiberglass (FG) exhaust tubing so you can clamp exhaust hose to the FG tubing without crushing the FG with the hose clamps. Mainly used in the marine industry.
They look to be 20-22 gauge and they have a flare of approx 1/8" to stop them from sliding all the way in the tube.
If I wanted to make a few of these, what could be used to do the flare? I can see by the tooling marks it looks to be some kind of roller tool/machine flared one edge prior to welding it together. Any ideas on how to do this myself? The one pictured below is for 6" exhaust. Thanks!




01-24-2013, 01:03 PM
maybe something like this? http://www.harborfreight.com/large-tail-pipe-expander-69549.html

01-24-2013, 01:11 PM
Bead roller, no doubt. Do a Google image search for "bead roller flare pipe". For onsie-twosies, some folks have welded up a tool using vise grips as a crimper.

01-24-2013, 01:13 PM
maybe something like this? http://www.harborfreight.com/large-tail-pipe-expander-69549.html

Those are junk, they work once on regular exhaust pipe and that is it. If the pipe is thin wall they last a little longer, but not much.

01-24-2013, 01:13 PM
maybe something like this? http://www.harborfreight.com/large-tail-pipe-expander-69549.html

No, not that. That won't make a shape at all like this.
This was done with a bead roller.

01-24-2013, 01:22 PM
Something like this?


And the die size is the size bead you want?

01-24-2013, 02:01 PM
Yes, a bead roller.

01-24-2013, 06:05 PM
Yes, definitely a bead roller like the pic just posted. You can also tell that it wasn't quite straight since the start and finish lines don't match up. Shows that it was done around the edge and not all at once.


01-24-2013, 08:15 PM
Done with this:

01-25-2013, 10:55 AM
Agreed, a bead roller with the correct dies will make that flare.

That part is used in a marine exhaust system?? No doubt it was made from SS. But who did that crappy weld? Marine exhaust is a harsh environment with high temperatures, acidic atmosphere, and corrosive liquid coolant (sea water) passing through it. That rough weld root is where initial corrosion will start, leading to premature failure of the part. Such failure can sink the boat by permitting sea water to leak in!

If you were to fabricate your own I hope you can weld stainless better than that!

- Mondo

01-25-2013, 12:04 PM
Yeah for marine exhaust. And yes 316 SS. The weld shown is the backside of the weld. Not sure what the bead loooked like cause its grinded smooth on the outside to slide inside the fiberglass tubing and exhaust hose. But I agree, from the backside it doesnt look too good.
That said, it's not really a critical part of the exhaust. The critical connection is between the exhaust hose and the fiberglass tubing itself.
The sleeve is just used inside both so you can torque down the hose clamps without fear of crushing or cracking the fiberglass tubing that could lead to a critical failure in the future.
Once the hose clamps have been torqued down, the crush sleeve has done it's job and is no longer needed until the next time the exhaust hose or FG tubing is replaced.

01-26-2013, 01:08 PM
sugaring. to prevent sugaring, it requires shielding with a purge set up or at the very least a purge dam.