| ASME "U" STAMPFor Pressure Vessels – Shop manufacture and field assembly, in accordance with ASME Code Sect. VIII div. 1 |
ASME "S" STAMPFor Manufacture and Assembly for Power Boilers, Power Piping – Shop manufacture and field assembly, in accordance with ASME Code Sect. I– ASME B31.1 |
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NATIONAL BOARD "R" STAMPStamp for Shop and Field Repairs and Alteration in accordance with the National Board Inspection Code. |
NATIONAL BOARD "NB" STAMPRegistration of boiler and pressure vessels. |