LoneGunman
Well-known member
I'm building a pressure assisted blaster. For my abrasives fill hole I tried using a 2" galvanized pipe coupling as the bung. I welded the bung to the top of my tank, no matter what I try I get air leaks. At first I thought I warped the first one, so I made sure the second was welded slowly and kept cool. That one still leaked. then I tried a 2" -1 1/2 reducer as a bung, still have the same problems. Lastly I tried a ****** as the bung and use a female cap, once again, it still ^&*(*&%$ leaks. I tried pipe dope and teflon tape, still leaks.
WTF am I doing wrong? It's driving me crazy because I have ZERO leaks in my air lines, my air system has held air for over a week without kicking on. I only need this thing to hold 7-10 PSI's.
I asked on the message board where I bought the plans from and they say to just use dope or tape which I have tried. I also don't like the idea of having to reapply the dope or the tape everytime I want to fill it. Leaving it leak was also brought up, my compressor would have no problem keeping up with the leak but I just don't like doing things halfassed.
So I need some ideas for an air tight easily removed cover for a hole used to fill my tank with abrasives. The hole can be any size over 2" but I would really like a 6" round hole. The only way I see of doing this is to lay out my holes on the tank and the removable plate, weld nuts to the inside of the tank and then weld up some horizontal pieces for the studs to form a "T" and use a gasket.
The only way I can figure out how to weld the nuts on the inside is to cut an 8" circle out of the tank, then cut my 6" from that, weld my nuts then weld the 8" piece back in.
WTF am I doing wrong? It's driving me crazy because I have ZERO leaks in my air lines, my air system has held air for over a week without kicking on. I only need this thing to hold 7-10 PSI's.
I asked on the message board where I bought the plans from and they say to just use dope or tape which I have tried. I also don't like the idea of having to reapply the dope or the tape everytime I want to fill it. Leaving it leak was also brought up, my compressor would have no problem keeping up with the leak but I just don't like doing things halfassed.
So I need some ideas for an air tight easily removed cover for a hole used to fill my tank with abrasives. The hole can be any size over 2" but I would really like a 6" round hole. The only way I see of doing this is to lay out my holes on the tank and the removable plate, weld nuts to the inside of the tank and then weld up some horizontal pieces for the studs to form a "T" and use a gasket.
The only way I can figure out how to weld the nuts on the inside is to cut an 8" circle out of the tank, then cut my 6" from that, weld my nuts then weld the 8" piece back in.
