# Derrick Operators, Oil and Gas > Rig derrick equipment and operate pumps to circulate mud or fluid through drill hole. - Code: 47-5011.00 (O*NET-SOC; SOC 2018 47-5011) - Family: [Construction & Extraction](https://foundation.org.ai/occupations#family-47), one of its 65 occupations - Tasks: 15 tasks (15 core) - Page: https://foundation.org.ai/occupations/47-5011.00 - JSON: https://foundation.org.ai/data/tasks/47-5011.00.json ## What the work is made of 1. Inspect derricks, or order their inspection, prior to being raised or lowered. Core task · Task 9889 · Rated by 80 people who do the job, June 2006 2. Inspect derricks for flaws, and clean and oil derricks to maintain proper working conditions. Core task · Task 9890 · Rated by 80 people who do the job, June 2006 3. Control the viscosity and weight of the drilling fluid. Core task · Task 9891 · Rated by 79 people who do the job, June 2006 4. Repair pumps, mud tanks, and related equipment. Core task · Task 9892 · Rated by 80 people who do the job, June 2006 5. Set and bolt crown blocks to posts at tops of derricks. Core task · Task 9893 · Rated by 77 people who do the job, June 2006 6. Listen to mud pumps and check regularly for vibration and other problems to ensure that rig pumps and drilling mud systems are working properly. Core task · Task 9894 · Rated by 80 people who do the job, June 2006 7. Start pumps that circulate mud through drill pipes and boreholes to cool drill bits and flush out drill cuttings. Core task · Task 9895 · Rated by 78 people who do the job, June 2006 8. Position and align derrick elements, using harnesses and platform climbing devices. Core task · Task 9896 · Rated by 77 people who do the job, June 2006 9. Supervise crew members, and provide assistance in training them. Core task · Task 9897 · Rated by 80 people who do the job, June 2006 10. Guide lengths of pipe into and out of elevators. Core task · Task 9898 · Rated by 81 people who do the job, June 2006 11. Prepare mud reports, and instruct crews about the handling of any chemical additives. Core task · Task 9899 · Rated by 79 people who do the job, June 2006 12. Clamp holding fixtures on ends of hoisting cables. Core task · Task 9900 · Rated by 78 people who do the job, June 2006 13. Weigh clay, and mix with water and chemicals to make drilling mud, using portable mixers. Core task · Task 9901 · Rated by 77 people who do the job, June 2006 14. String cables through pulleys and blocks. Core task · Task 9902 · Rated by 78 people who do the job, June 2006 15. Steady pipes during connection to or disconnection from drill or casing strings. Core task · Task 9903 · Rated by 79 people who do the job, June 2006 ## More in Construction & Extraction - [Boilermakers](https://foundation.org.ai/occupations/47-2011.00): 17 tasks - [Brickmasons and Blockmasons](https://foundation.org.ai/occupations/47-2021.00): 14 tasks - [Carpenters](https://foundation.org.ai/occupations/47-2031.00): 29 tasks - [Carpet Installers](https://foundation.org.ai/occupations/47-2041.00): 16 tasks - [Cement Masons and Concrete Finishers](https://foundation.org.ai/occupations/47-2051.00): 26 tasks - [Construction and Building Inspectors](https://foundation.org.ai/occupations/47-4011.00): 19 tasks - [Construction and Related Workers, All Other](https://foundation.org.ai/occupations/47-4099.00): no tasks listed - [Construction Laborers](https://foundation.org.ai/occupations/47-2061.00): 27 tasks - [Continuous Mining Machine Operators](https://foundation.org.ai/occupations/47-5041.00): 15 tasks - [Drywall and Ceiling Tile Installers](https://foundation.org.ai/occupations/47-2081.00): 26 tasks - 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[Plumbers, Pipefitters, and Steamfitters](https://foundation.org.ai/occupations/47-2152.00): 30 tasks - [Rail-Track Laying and Maintenance Equipment Operators](https://foundation.org.ai/occupations/47-4061.00): 26 tasks - [Reinforcing Iron and Rebar Workers](https://foundation.org.ai/occupations/47-2171.00): 7 tasks - [Rock Splitters, Quarry](https://foundation.org.ai/occupations/47-5051.00): 9 tasks - [Roof Bolters, Mining](https://foundation.org.ai/occupations/47-5043.00): 14 tasks - [Roofers](https://foundation.org.ai/occupations/47-2181.00): 27 tasks - [Rotary Drill Operators, Oil and Gas](https://foundation.org.ai/occupations/47-5012.00): 20 tasks - [Roustabouts, Oil and Gas](https://foundation.org.ai/occupations/47-5071.00): 13 tasks - [Segmental Pavers](https://foundation.org.ai/occupations/47-4091.00): 12 tasks - [Septic Tank Servicers and Sewer Pipe Cleaners](https://foundation.org.ai/occupations/47-4071.00): 22 tasks - [Service Unit Operators, Oil and Gas](https://foundation.org.ai/occupations/47-5013.00): 19 tasks - 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