Aug 20, 2015 #1 bhart192 Civil/Environmental Feb 6, 2006 81 can someone direct me to a paper article etc. which better explains the R1 to R4 markings
Aug 21, 2015 #2 GenB Mechanical Oct 24, 2003 1,362 The National Board of Boilers and pressure Vessels Inspectors. Columbus OH. B&PV repair NBIC paper Upvote 0 Downvote
Aug 21, 2015 #3 metengr Materials Oct 2, 2003 15,478 You mean RT1-RT4 markings https://www.nationalboard.org/PrintPage.aspx?NewsPageID=144 Upvote 0 Downvote
