Sat Apr 11, 2009 4:30 pm
I also just had a lined tank hydroed with no problem. As long as you use them with air or premixed NITROX there should be no problems. I don't like to do pure O2 in a lined tank, I have done it but don't make a practice of it. If you ever wanted to do a pp fill, stay below 350 psi (320 psi in a 2250 psi tank will get you 32%) and fill real slow.
I have never tried to get the resin out, but I have seen photos of steel shot blasting systems for 200 and 300 cubic foot welding tanks. It should work on the resin. You could also try a paint stripper with methylene chloride, if the resin is an organic, methylene chloride should eat it over time.
If anyone wants to try with a scrap tank that is cut open try some stripper and see if the coating will loosen, bubble, or soften- try this outside only.
If the stripper works, put in a pint or so of stripper into a good tank, put a valve back on, roll it around to coat the entire surface and let it sit in a warm area for an hour or so. Pour out what you can, then rinse with hot water. Immediately add a rough tumble media and start tumbling. If the coating is soften enough, the media should now be able to cut it.
The problem with this, is that it creates a lot of hazardous waste and is more work then I would ever want to do. Steel 72’s are common and it would be easier (and cheaper) to just find another tank.
A last alternative would be a commercial hot paint strip firm. There are not all that many left, but if there is one near you, a hot phenol based stripper will eat anything.
Double Hose Regulators, It not just a Hobby, it’s a Disease