Plumbing Questions? Ask a Plumber and Get Answers ASAP.
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I looked at your question...temp regarding pressure is obviously easy to find out. The issue of course is finding whether the vessel can handle that.
The unknown in this case is the welds. Is the unit welded at all corners?
Is the unit bent into shape with minimal welds?
Type of welds and materials?
We would need more info, or you would have to physically test units with pressure.