Rules for this Code Section have been developed considering
the needs for applications that include piping
typically found in electric power generating stations, in
industrial and institutional plants, geothermal heating
systems, and central and district heating and cooling
Key changes to this revision include the relocation of the rules for nonmetallic piping and piping lined with nonmetals from a nonmandatory appendix to a mandatory appendix, selected language from Nonmandatory Appendix V has been moved into the body of the code in Chapter VII, the preheat and post weld heat treatment rules have been reformatted into tabular form for clarity, and cold forming rules for creep strength enhanced ferritic steels have been incorporated into Chapter V.