API 653 Data Sheets-Line Sizes

Repad-Nozzle size that never requires a repad

Repairs- On existing tanks, new nozzle must use insert plate if shell is over 1/2" thick and shell material does not meet current MDMT requirements       653:  9.8.6

RT- Maximum pipe size when using RT elliptical shot (double-wall technique, double wall view)    V:  T-271.2.b

Hot tap- Maximum nozzle size that can be hot tapped when course thickness is > 1/2" and shell has unknown toughness  

Definition- When adding a new nozzle, nozzle size to be considered a major alteration