Drilling rigs are machine which make boreholes in the ground and/or the seabed for the purpose of drilling oil, natural gas or water extraction wells. Most rigs rely on several primary systems to get the job done: (1) a hoisting system, often referred to as the derrick or drawworks, (2) a drive group composed of motors, chains and compounds, (3) A circulating group of pumps, a kelly, drill string, return lines and pits, (4) well control equipment