I am developing a vent to allow us to superheat a steam export line during startups (to be used 1 or 2 times a year). It will be a 3" SHC40 carbon steel pipe, with a silencer at the top (95 Lb). It will vent up to 50,000 Lb/hr of superheated steam, up to 750°F. I have a pipe rack structure available, with supports at 12, 17 and 22 feet up, and am thinking of continuing 3 feet above the structure, with the silencer on top of that. My concern is on thermal expansion; with such a large temperature differential, I show a thermal expansion of 1.5 inches. What is the best way of mounting the pipe? Do I need spring cans at the top and bottom, and u-bolt it at the 12 foot height? Or can I rigid-mount everything? Rigid mount at the top and let everything hang? Thanks.
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