Dull Men's Club
An unofficial chapter of the popular Dull Men's Club.
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Use a search engine, a tradesperson, Reddit, friends, a specialist Facebook group, apps, Wikipedia, an AI chat, a reverse image search etc. to answer simple questions or identify objects. Also see rule 1, “comment baiting”.
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No, if the safety systems can fail like that for any reason it is the fault of the pressure cooker. Unless he intentionally broke the safety systems, or one of the systems was already known to be faulty and he continued to use it. It can never be acceptable for safety systems to fail.
Safe procedure is to let the pressure cooker cool down before trying to open it. Especially if the “release valve wasn’t working in any position”.
1000% on the user here
The point of safety is humans are not perfect. They need to prevent our stupidity in cases where we are likely to be stupid. This has long been known as one of those situations where people don't realize the danger and so we need to force the correct procedure. You cannot document/warn about an issue unless you can't do better in other ways.
He said he was trying to further close it, not open it while hot.
But there was no pressure control. If he did seal it further, it would have been a bigger bomb eventually.