Be careful not to get the integrity too strong, otherwise you could have a real pipe bomb on your hands..
On Fri, Feb 6, 2015 at 12:59 PM, Bob Higgins <[email protected]> wrote: > Ryan Hunt reports that the failure mode was NOT the compression fitting > giving way under pressure - the fitting remained intact. This experiment > was of the "easier Parkhomov" design, posted previously where the seal was > made with a compression fitting, in this case with the use of a soft > aluminum ferrule at the suggestion of Alan Goldwater. Alan's tests > suggested the compression fitting would hold and it did! Using the > compression fitting is a real win because it completely avoids the > problematic sealing of the ends with cement while providing an opportunity > to instrument the reaction vessel. > > When this failure occurred, it appeared to be a raw ceramic body failure. > This could easily have come from too much pressure coming from a too large > charge of LiAlH4 for the vacant volume inside the apparatus. MFMP will > extract that volume information and relate it to the weight of LiAlH4 that > was added, as being a benchmark for too much LiAlH4. The tube used was > 1/4" OD, but at the moment, I am not sure if it was a 4mm ID tube or a 1/8" > ID tube. The Parkhomov tube had an ID of half of its OD. > > Bob Higgins > > On Fri, Feb 6, 2015 at 11:39 AM, MarkI-ZeroPoint <[email protected]> > wrote: > >> At 2:29/2:30 into the short segment posted by Craig, it looks like the >> right-side end-plug, or whatever is sticking out that end, blows out. And >> I use that term specifically since one also sees some hint of a pressure >> release. Whether that release is at an appropriate level is apparently >> debatable... >> -mark iverson >> >
