Charlesaf3 said:
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but a pressure tank explosion sending shrapnel through the barn is not something I need.
I really wonder how often it happens?
A small air compressor under 200 psi, the most dangerous scenario I can perceive is a busted air hose whipping around slapping you in the head. The weakest point will always fail first, the steel tank is definitely not the weakest point on a shop air compressor.
A Steam Vessel allowed to over pressurize is another story, H2O is breaking down to its elements, Hydrogen Gas is explosive when ignited. Also a steam vessel will contain a substantial amount of water, if a rupture occurs below the water line the escaping water at pressure will have substantial force escaping, possibly launching the vessel. An example of Hydrogen danger would be welding in water in a small enclosed space, Hydrogen Gas will build up, ignite and cause an explosion. Commercial divers are warned of this occupational hazard.
Has anyone ever shot a full rattle can with a BB gun to see what happens, I have and no explosion, just a small hole with a mess.
If the Air Compressor Pressure Switch and Pressure Relief Valve fail and the pump is capable to build up enough pressure for a violent tank failure, I see a problem. But this would be as dangerous, if not more having a brand new tank.
Sheesh, light duty PVC pipe is rated for pressures under 200 psi. Steel is not going to rip apart violently at normal working pressure. Even a loose fitting will not have much velocity at low pressures, unless something like an air cannon was in place allowing pressure to build velocity of the mass propelling it greater distances.
Basically, if an air compressor tank rusts through, the air will escape and the pump will run and run and run, sorry no explosion! Just need to patch or buy a replacement.