L1-L2 or your case L6 is required as per code to check full stress range. Search this forum and read this newsletter articles: Satisfying expansion load case requirements" and "Expansion Case for Temperatures Below Ambient"
http://www.coade.com/newsletters/jul03.pdfhttp://www.coade.com/newsletters/may93.pdfBut you need to check with process wheather system operates between -100 to 120 in a operation cycle.
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