Casing and Liner Colour Codes Colour Codes for New Casing/Liner
All new casing shall be colour coded for yield as per API specifications 5CT.
API Casing/Liner Grade Identification Colour Codes
API Grade
Markings On Pipe Body
Markings on Coupling
P-110
One white band
White coupling
L-80
N-80
One red band and one brown band
One red band
Red coupling with . . .