| Subsystem |
Time to initial failure (Hrs.) |
Time to next failure (TNF) (Hrs.) |
| Air drilling system |
255 |
9 + WEIB (240, 0.376) |
| Hoisting system |
679 |
4 + EXPO (606) |
| Power system |
1963 |
2 + WEIB (289, 0.339) |
| Well control system |
240 |
412 + WEIB (121, 0.235) |
| Well monitoring system |
2022 |
UNIF (122, 2.92e+003) |
| Circulating system |
5116 |
−0.001 + EXPO (77.7) |
| Mechanical handling system |
4836 |
5116 |
| Top drive system |
413 |
2 + WEIB (320, 0.339) |