Specifies calculation of the required head thickness at the location of the nozzle by the rules of paragraph UG-32 or by the rules in Appendix 1, according to code interpretation VIII-1-95-13. This option is selected by default and should always be selected.
The code in paragraph UG-45 requires a calculation of the required head thickness at the location of the nozzle. This sometimes leads to the incorrect assumption that the thickness may be calculated according to paragraph UG-37. However the code interpretation, VIII-1-95-133, issued December 1996, states:
Question: Does the definition of the required thickness tr for a formed head given in the nomenclature of UG-37(a) in section VIII, Division 1 apply when determining the minimum nozzle neck thickness in UG-45(b)(1)?
Reply: No, see UG-32.