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This example was a badly-installed Nitrous Express kit (not to be confused with the NoS brand). They wired up the heater directly to 12v (not on a temp switch) and left it on. Then they had TWO pressure release vents on - instead of one - which doubled the emergency release pressure. The car owner claims a malfuntioning safety valve/disc/cap. (?) And below you can see the results.
Fortunately the car was garaged, so no one was hurt. This wasn't a 3S car (it was a modded '91 Nissan Maxima owned by Doyle Schoenberger of Ohio). But these photos bear looking at, just so you know what you're dealing with when you consider adding a shot of Nitrous. This was a professional installation on a spotlessly clean engine, with the bottle kept safely (?) in the trunk!