(Fixed, Floating, and U-Tube)
The conditions grid is a repository for tubesheet design cases. Values entered here will overrule values entered on previous tabs. For example, if shell pressure on this tab is 15 PSI and shell pressure on the shell tab is 50 PSI, 15 PSI will be used in the calculations; however, a value entered on the conditions grid will not change the value on any other tab.
The values entered on this tab default based on settings from other tabs. If temperatures, pressures, or materials are changed on the other tabs, the values on this tab will update even if they were manually changed. If the values on this grid are manually changed, they will remain the same until a change on another tab or a manual adjustment occurs.
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Thermal Case: This field is only available for the 2013 code year and later. If this box is selected, thermal loads will be considered and the case treated as an operating case.
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Alpha: The material mean coefficient of thermal expansion based on the TE tables from Section II, Part D; column B is used in those tables. There are several materials that do not have clear matches in these tables. When a clear match cannot be found by the software’s assignment criteria, this value will be zero. Shell Alpha s,m and Shell Band Alpha s,m1 are based on Tsm. Shell Alpha s’ is based on Ts’. Tube Alpha s,m is based on Ttm. Stationary Channel Alpha C’ and Floating Channel Alpha C’ are based on Tc’. Tubesheet Alpha’ is based on T’.
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