Putting your solvent tank in a non-rated freezer isn’t a great idea. Lots of folks do. We don’t have a count on how often that fails…as few who make that mistake are able to raise their hand to report the failure.
Steel shrinks, gaskets lose elasticity.
I have certainly run into dozens of leaks that only occurred once temps were dropped.
Eg two solvent tanks with ASME 6” clamps. Held 225psi for days. Pulled air in under vac at -50C.
Unfortunately we noticed that AFTER both systems were operating (we could tell we were taking on air).
We got lucky on that one (skilled operators)…and I learned to perform pressure and vac tests at operational temps BEFORE adding solvent.
Switched to tuffsteel gaskets and non-ASME clamps, because I had to break a bolt to get one of them off…
Edit: very important discussion on nuts…