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Old 11-12-2007, 08:34 AM   #11
z987k
 
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I believe it is to ensure that the tank wont explode during use or filling.

http://en.wikipedia.org/wiki/Hydrostatic_test



 
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Old 11-14-2007, 02:28 AM   #12
Bugeaterbrewing
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Quote:
Originally Posted by SenorWanderer
anyone care to explain what tests are performed when you need it? is it a structural issue, to make sure the cylinder isn't damaged and won't explode? what is it that could happen to a cylinder to cause it to fail?
The test is a hydrostatic test, often refered to as a hydro. For a detailed explanation of the test check this link: http://en.wikipedia.org/wiki/Hydrostatic_test

The most common reason for failure is rusting of the tank. For this reason you don't ever want to let your tank bleed completely out ( i.e. don't open the valve without the regulator attached) and leave the valve open. The humidity in the air can begin the rusting process. The rust will create a weak spot that can eventually fail. The rusting process may take years before it actually gets weak enough to be a problem. Even if you are always careful not to let room air in, you don't know if a previous owner has, especially if you exchange tanks rather than refill. The hydrostat test is cheap insurance against what could be fatal consequences.

Normally I have my tanks refilled. However, when they are with a year of needing recertification, I take them to a place that exchanges tanks. This way I avoid having to pay for testing. It usually costs me $2-3 more to exchange than refill, but that is a big savings in having to pay $20-25 for the test.

Wayne
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Old 11-14-2007, 04:52 AM   #13
kladue
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I find the pictures of the rusty tanks a bit humorous as the tanks are all hydro tested and most are never dried out before the valve is screwed in and the tank is refilled. Would not be surprised to see most of the spun steel tanks in use are rusted on the inside.

 
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Old 11-14-2007, 05:00 AM   #14
Sea
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Quote:
Originally Posted by kladue
I find the pictures of the rusty tanks a bit humorous as the tanks are all hydro tested and most are never dried out before the valve is screwed in and the tank is refilled. Would not be surprised to see most of the spun steel tanks in use are rusted on the inside.
Gauranteed you're right. No mention of the fact that you could hdryo test a tank today, and it could develope a leak tomorrow.

Either way, I'm heading out to the garage to disconnect my tank and giving up kegging, .....just to be safe.
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Old 11-14-2007, 06:09 AM   #15
Crazytwoknobs
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Mistell... crap



 
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