Shop Floor Talk  

Go Back   Shop Floor Talk > Welding and Metalworking Forums > Shop & Safety

SFT Search:   
Reply
 
Thread Tools Display Modes
  #1  
Old 08-04-2018, 06:21 AM
Bubba's Avatar
Bubba Bubba is offline
Senior Member
 
Join Date: Jul 2004
Location: Wyoming
Posts: 608
Default 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?
__________________
Nuke em til they glow then shoot em in the dark.
Reply With Quote
  #2  
Old 08-04-2018, 07:56 AM
Walker's Avatar
Walker Walker is offline
Standard of Excellence
 
Join Date: Aug 2004
Location: Cave Creek AZ
Posts: 4,195
Default

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.
__________________
Walker
Chief slag chipper and floor sweeper, Ironwood Artistic
Reply With Quote
  #3  
Old 08-08-2018, 07:14 PM
milomilo's Avatar
milomilo milomilo is offline
Auction Addict
 
Join Date: May 2010
Location: Wheatland, Wyoming
Posts: 13,500
Default

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.
__________________
Chris

“Necessity is the plea for every infringement of human freedom. It is the argument of tyrants; it is the creed of slaves"

William Pitt (the Younger), Speech in the House of Commons, November 18, 1783
Reply With Quote
  #4  
Old 08-09-2018, 05:33 PM
Ironman's Avatar
Ironman Ironman is offline
Iron Modification Investigator
 
Join Date: Feb 2008
Location: Warburg, Alberta, Canada
Posts: 12,737
Default

Quote:
Originally Posted by milomilo View Post
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.
__________________
Gerry
You got freedom of speech, if you don't say too much.
Aaron Neville

Even duct tape can't fix stupid ... But it can muffle the sound. Attributed to Red Green
Reply With Quote
  #5  
Old 08-09-2018, 10:56 PM
Walker's Avatar
Walker Walker is offline
Standard of Excellence
 
Join Date: Aug 2004
Location: Cave Creek AZ
Posts: 4,195
Default

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.
__________________
Walker
Chief slag chipper and floor sweeper, Ironwood Artistic
Reply With Quote
  #6  
Old 08-10-2018, 08:04 AM
Ironman's Avatar
Ironman Ironman is offline
Iron Modification Investigator
 
Join Date: Feb 2008
Location: Warburg, Alberta, Canada
Posts: 12,737
Default

Quote:
Originally Posted by Walker View Post
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.
__________________
Gerry
You got freedom of speech, if you don't say too much.
Aaron Neville

Even duct tape can't fix stupid ... But it can muffle the sound. Attributed to Red Green
Reply With Quote
  #7  
Old 08-13-2018, 10:57 PM
Don_S Don_S is offline
Senior Member
 
Join Date: Mar 2005
Location: Tenville, IA
Posts: 508
Default

Quote:
Originally Posted by Walker View Post
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
Reply With Quote
  #8  
Old 08-14-2018, 01:02 AM
milomilo's Avatar
milomilo milomilo is offline
Auction Addict
 
Join Date: May 2010
Location: Wheatland, Wyoming
Posts: 13,500
Default

So Bubba, what did you decide to do?
__________________
Chris

“Necessity is the plea for every infringement of human freedom. It is the argument of tyrants; it is the creed of slaves"

William Pitt (the Younger), Speech in the House of Commons, November 18, 1783
Reply With Quote
Reply

Thread Tools
Display Modes

Posting Rules
You may not post new threads
You may not post replies
You may not post attachments
You may not edit your posts

BB code is On
Smilies are On
[IMG] code is On
HTML code is Off

Forum Jump

Web Search:

All times are GMT -5. The time now is 05:32 AM.


Powered by vBulletin® Version 3.8.11
Copyright ©2000 - 2018, vBulletin Solutions Inc.