Sounds like you got lucky, most air compressor tanks are only rated for 240 psi max., since that one has been stressed past it's design limits I'd be replacing it soon.
I've readjusted the pressure switches on my two stage compressors to shut off at 150 psi instead of 175.
Seldom do I need the extra pressure, yes during heavy use the compressor cycles more but it doesn't work as hard building that extra 25 psi.
My Quincy compressor as a safety pop off valve in the discharge side of head and another in the tank, both are 200 psi pop offs.
I have seen and had pressure switches stick before but the pop off valve worked on each occasion.
A funny story about pop off valves.
Big trucks have a air governors that regulates air pressure to 120 psi. I was nearing Fort Collins, Co around 10 pm one night, the air governor on the truck I was driving vibrated loose and I didn't notice the air pressure increasing, the air tanks on that truck where mounted to the cab under the floor board. Suddenly the pop off valve on the air tank directly under my seat poped off at 175 psi.
I nearly baled out of the truck at 55 mph, although a change of under clothes was not required, it was close.
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