| 1. | Inspect derricks, or order their inspection, prior to being raised or lowered. |
| 2. | Inspect derricks for flaws, and clean and oil derricks in order to maintain proper working conditions. |
| 3. | Control the viscosity and weight of the drilling fluid. |
| 4. | Repair pumps, mud tanks, and related equipment. |
| 5. | Set and bolt crown blocks to posts at tops of derricks. |
| 6. | Listen to mud pumps and check regularly for vibration and other problems, in order to ensure that rig pumps and drilling mud systems are working properly. |
| 7. | Start pumps that circulate mud through drill pipes and boreholes to cool drill bits and flush out drill-cuttings. |
| 8. | Position and align derrick elements, using harnesses and platform climbing devices. |
| 9. | Supervise crew members, and provide assistance in training them. |
| 10. | Guide lengths of pipe into and out of elevators. |
| 11. | Prepare mud reports, and instruct crews about the handling of any chemical additives. |
| 12. | Clamp holding fixtures on ends of hoisting cables. |
| 13. | Weigh clay, and mix with water and chemicals in order to make drilling mud, using portable mixers. |
| 14. | String cables through pulleys and blocks. |
| 15. | Steady pipes during connection to or disconnection from drill or casing strings. |