The table is for guidance only lt lllustrates thecontents of the preheat section of BS2633 (Table5) whuch should be consult in its entirety.
A number of othrr important standards give guidance on preheat, theses include:
ASME Code Section lll : nucleare power plant components Section Vlll : ASME Boiler and pressure vessel code BS1113 Watee tube Steam generating Plant BS4570 Fusion welding of steel castings Part1 - Production, rectifcation and repair Part2 - Fabrication Welding
BS5135 Metal arc welding of carbon and carbon-manganese steels BS5500 Unifired fusion welded pressure vesselsSpecial Note re ANSI/B31-1 & ANSI/B31-3
The table below is for guidance only. Referance should be made to the appopriate specification