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Tool Talk Discussion Forum

Old Air Compressort

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BobOHIO

06-09-2007 11:10:37




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How old does a compressor have to be before it is at risk of the tank blowing up? I heard of a guy recently who air compressor exploded and blew a hole in his garage roof and a second hole in the roof when it came back down. Nobody was home so nobody got hurt thank goodness.




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Joe(TX)

06-10-2007 18:19:21




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 Re: Old Air Compressort in reply to BobOHIO, 06-09-2007 11:10:37  
A very long life if it is an ASME tank. If not ASME, your life may be short.
An ASME tank will not normaly fail in the manner mentioned. The failure Rod refered to was a weld joint failure. An ASME tank will never fail this way if it is operated under its safe working pressure and drained regularly. An ASME tank has the weld checked for inadequate penetration or inclusions. The certified tanks include a corrosion allowance and a healthy saftey factor.

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Wardner

06-09-2007 19:23:22




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 Re: Old Air Compressort in reply to BobOHIO, 06-09-2007 11:10:37  
Although I don't have any data to back this up, I think you will find that air compressor tanks, that are operated at or below design pressure, fail in a safe mode. That would mean a pinhole leak vs a catestrofic and instanteous energy discharge.

At any rate, you can test your tank by filling it with water and giving it a test to 150% of rated pressure. If you can't make that much pressure, screw in a grease fitting and use your loaded grease gun. If something ruptures, there won't be an explosion. Use a guage that is known to be good.

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Rod (NH)

06-09-2007 20:09:25




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 Re: Old Air Compressort in reply to Wardner, 06-09-2007 19:23:22  
Does this look like a pinhole leak or a "safe mode" failure?



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Wardner

06-09-2007 20:20:29




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 Re: Old Air Compressort in reply to Rod (NH), 06-09-2007 20:09:25  
Sure, excrement happens and I have heard the stories. BTW, that tank did not have a stamp. It was bootlegged. Need I say more?

OK, I will.

I bought a used air receiver when in my early twenties (around 1970). It failed via a pinhole.



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Rod (NH)

06-09-2007 20:48:42




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 Re: Old Air Compressort in reply to Wardner, 06-09-2007 20:20:29  
Consider yourself a lucky dude. BTW, there are many, many air tanks out there that do not comply with code and do not have a stamp. Especially the older "consumer" ones. They are not "bootlegged". It wasn't that many years ago that only a very few states required code compliance for home-shop type air compressor tanks. I can easily remember air compressors for sale by Sears that indicated "not for sale in some states". In fact I think you can still buy some non-code tanks by mail-order if you like to save money and take risks.

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Wardner

06-09-2007 19:38:09




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 Re: Old Air Compressort in reply to Wardner, 06-09-2007 19:23:22  
BTW, I don't believe your story. The odds of a tank going straight up and down are too long to be real.

Ya, I know. People die everyday from bullets fired vertically into the air. And if you are walking below the Empire State building, watch out for those "pennies from heaven".



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Bob

06-09-2007 12:23:52




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 Re: Old Air Compressort in reply to BobOHIO, 06-09-2007 11:10:37  
Did the tank fail in normal operation, or did the pressure switch "stick" and over-pressure it?

Tanks can be hydrostatically tested for safety.



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