Premium Class drill pipe has become the NORM in the industry for drilling, while Class 2 has been rarely used by most Operators.
|
Premium Class |
Class 2 |
Tube wall thickness (% remaining wall) |
>= 80% |
>= 70% |
Maximum Allowable Slip Cut (% remaining wall) |
>= 90% |
>= 90% |
Minimum Tool Joint Outside Diameter |
80% of tube |
|
Refer to API RP 7G-2 “Recommended Practice for inspection and Classification of Used Drill Stem Elements” for more information.