Can anyone point me to reference works, papers, et.al, on the exact mechanism of failure when a relatively thick vessel wall is below the transistion temperature and then subject to a (large) thermal shock. How does the fracture start, (existing micro-crack?) and where does the energy come from...
B31.3, Cl.302.2.4 (f)1a, allows 33% overstress for up to 10 hrs per instance. Apart from the Wind and/or Seismic allownces, ASME VIII does not appear to have any similar provisions. Since a very considerable amount of 31.3 piping is connected somewhere to an ASME vessel, would anyone care to...
You will need to 'neck' the pin to ensure it shears (fails)where you want it to. Also it is best to house it in hardened bushes either side of the neck, if the aim is to simply replace it if it breaks.
This method was widely used to protect overhead push-chain conveyors, some 20-30yrs ago...
If you can lay your hands on one of the (very) old Link Belt catalogues, either pre or just post-WWII, these have almost exhaustive info on designing just about any conveyor, including screw conveyors. Using this it is a relatively simple task to set up your own spreadsheet.
