As home to supermajors, as well as a plethora of smaller, independent energy players, the US boasts one of the largest concentrations of energy personnel in the world. With its insatiable appetite for energy resources, the United States is the world's single largest consumer of oil, using as much as 20.73 million barrels per day as of 2008. Recently, interest has peaked in the vast quantity of untapped natural gas resources in the US, the reserves of which were inventoried in 2008 at 238 Tcf, with producers specifically targeting the nation's promising shale formations for this energy commodity.
Hydraulic and pneumatic systems are two of the most efficient and compact forms of power for machinery and can be configured into types of power sources to push, pull, lift, lower, rotate and move equipment. Hydraulics work on the principle of pressurized fluid while pneumatics use gas, typically air, that is pulled into a compressor. Due to the pressure generated in each, hydraulic systems are commonly used to lift heavy objects while pneumatic systems are commonly used in the operation of rotary tools, clamps and pushing mechanisms.