At what pressure would have a stroke average pressure cooker, if everything is air escapes were blocked?

the normal cooking pressure is about 15 pounds per square inch, but the cook has always vent. plus he always has a relief valve or security. I try to discover what would happen if the vent and all valves have been sealed. Surely the average steel or aluminum vessel could tolerate higher than 15 psi. but how much more I wonder.

The seal would probably blow several hundred PSI. The real pressure to blow out of the pot would be several thousand pounds per square inch, but the lid will be welded.

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