Just thought I'd share my first experiences removing dents. This has been on my to do list for a while, but I've been apprehensive to try due to safety concerns. After some Youtube research and a prospective pipe buyer nudge, I made the leap. I wish I had taken pictures of the first pipe I did yesterday (was just so nervous). It was a TRX 250R PSI "sea horse" pipe, dented in over an inch deep. I was so impressed with how well/easy the dent came out. My son watched from over/behind me with amazement. Creases are hard to completely remove, and are probably a weak/stress point, so I didn't want to over heat/pressurize with false hopes of making things perfect.
Anyway, I only needed 25-30 psi. Just keep in mind as heat builds psi pressure will increase. So, make sure your plugs are sound and safety wire them if you're not 100% sure they'll hold. Although all the videos I watched showed shop air use, I chose to use Argon (inert/non flammable) from my welder for added safety. Less the possible pipe bomb/boom factor! Old carbon oily spooge, + compressed air, + high heat, = :wondering. Some videos showed guys using up to 80 psi :crazy:. I used a rose bud tip (oxy-propylene), so I'm not sure if that made the expansion go that much easier, but 25 psi was quite enough. A complete blow out would be very scary! Please BE CAREFUL if you try this, but I was so happy saving a bunch of pipes I almost tossed in the steel bin.
ATC 250R Jemco *BEFORE*
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*AFTER*
TRX 250R Selvy *BEFORE*