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Bubba 08-04-2018 06:21 AM

Compressor question.
 
I have a 60 gal. compressor for about 15-20 years.
At the tme I bought it new. It's a Cambell Housfeld Sonborn
single stage job. I guess it was made in Mexico.
The tank plate say that it was tested in 1999 at 400 psi.
Standard use, not really industrial setting. Since I heard
horror stories about old tanks blowing up I decided to check
the tank thickness. I bought a cheapo ultrsonic thickness gauge
and checked the tank all over the place. At the top and sides
measure was 2.5 mm and the bottom around the drain valve 1.9-2.2 mm.
So my question, is it still safe or just be safe and junk it.
What do you guys think?

Walker 08-04-2018 07:56 AM

Best thing would be to inspect it. My big compressors have 2" weld-o-lets on them, so inspecting the inside is easy. You might need to get creative and use a bore scope type camera. In my experience the tanks suffer one of two maladies. Either they rust out on the bottom, or the get fatigue cracks at the points where the brackets are welded to the tank.

Even better would be to remove the components fill it with water and pressure test it at the original 400 psi.

milomilo 08-08-2018 07:14 PM

Have you regularly drained the condensation water from the tank? If so, the inside may be fairly clean. I would just pressure test it to the 400 psi with a pressure washer.

Ironman 08-09-2018 05:33 PM

Quote:

Originally Posted by milomilo (Post 718469)
Have you regularly drained the condensation water from the tank? If so, the inside may be fairly clean. I would just pressure test it to the 400 psi with a pressure washer.

Yes, and if it passes the test, consider having it galvanized. The cost in town here to galvanize a tank and to re-tap the pipe ports is under $100. They will clean inside with acid and sandblast the exterior, and dip it.

Walker 08-09-2018 10:56 PM

I hadnt thought about galvanizing, great idea.

If you do decide to pressure test it be sure to fill it with water first. That way if it ruptures it does not have the kinetic energy of all the compressed air stored inside to cause mayhem. I like the pressure washer idea too, I had never thought of that.

Ironman 08-10-2018 08:04 AM

Quote:

Originally Posted by Walker (Post 718524)
I hadnt thought about galvanizing, great idea.

If you do decide to pressure test it be sure to fill it with water first. That way if it ruptures it does not have the kinetic energy of all the compressed air stored inside to cause mayhem. I like the pressure washer idea too, I had never thought of that.

If you do a search you can find that I did that on a tank. The easiest and most reliable way to control pressure is to attach the pressure hose to the tank with a Tee. On the tee put on a gate valve and by controlling the amount of bleed off, you can set pressure in the tank. Then close a valve to the tank so that the water in the tank is under pressure and stays that way for 24 hours. I would want to see no drop below the original pressure in the 24 hr period.
Be aware that sunshine will expand the water and drive the tank pressure higher.

Don_S 08-13-2018 10:57 PM

Quote:

Originally Posted by Walker (Post 718524)
I hadnt thought about galvanizing, great idea.

If you do decide to pressure test it be sure to fill it with water first. That way if it ruptures it does not have the kinetic energy of all the compressed air stored inside to cause mayhem. I like the pressure washer idea too, I had never thought of that.

We used to use old car wash pressure washer pumps to test fire hoses back in the days I was a volunteer firefighter.

Don

milomilo 08-14-2018 01:02 AM

So Bubba, what did you decide to do?


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