How does an old fashioned oil derrick work
Larry Schrott, 73, has tended to eleven oil wells every weekend for more than 40 years. He is one of 5,618 active independent producers in PA who pump oil. F Carl starting a shut-in oil well for the first time in many years with an American 228-246-86 pumpjack running on an Arrow engine. Bryan, Texas. 8/14/2008 De The most basic type of derrick is controlled by three or four lines connected to the top of the mast, which allow it both to move laterally and cant up and down. To lift a load, a separate line runs up and over the mast with a hook on its free end, as with a crane. Forms of derricks are commonly found aboard ships and at docking facilities.