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As I read in some answers to other questions they should not explode, is it true? Why is that? Is it because they have a safety valve or just because they are very strong?

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Remember the rule of Mythbusters: Everything explodes. It's just a question of what it takes. –  fire.eagle May 23 '13 at 15:40
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I'll be submitting this to them as a myth. You're about to become famous Paolo, hopefully not at the cost of wasting beer though... –  Scott May 23 '13 at 17:17
    
@Scott: If they take this on, please let us know when the episode will air! –  FrustratedWithFormsDesigner May 23 '13 at 19:09

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up vote 5 down vote accepted

At beer pressures, a keg cannot explode. It's designed to take much more pressure - rated to around 120-130 psi. Even at failure, the seals will fail rather than the chamber itself. Failing at standard beer pressures will be as a leak (pinhole or crack).

Which isn't to say they can't explode. It's a sealed pressurized vessel - so it could explode or implode. It's just not normal for beer to rapidly reach the pressure required to cause an explosion (or for outside pressure to cause an implosion).

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The pressure relief valve is rated 125psi. If that's the max working pressure, I expect the keg will hold at least twice that before failing. –  mdma May 24 '13 at 11:49

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