A top drive is a mechanical device on a that provides clockwise torque to the to drill a . It is an alternative to the and . It is located at the place below the traveling block and moves vertically up and down the derrick.
[pdf] Fairmount Park, Philadelphia's first park, occupies 2,052 acres (830 ha) adjacent to the banks of the Schuylkill River. Since 2010, Philadelphia Parks & Recreation divides the original park into East and West Fairmount parks. The original domain of Fairmount Park consisted of three areas: "South Park" or the. .
Summer 1999 director Andrew Repasky McElhinney shot exteriors in Carpenter's Woods in the Wissahickon Valley Park part of Fairmount. .
Park properties include the Centennial Arboretum, a Horticulture Center, Fairmount Water Works, Memorial Hall (home of the Please Touch Museum), Shofuso Japanese.
[pdf] Several different kinds of top drives exist, and are usually classified based on the "Safe Working Load" (SWL) of the equipment and the size and type of motor used to rotate the drillpipe. For offshore and heavy duty use, a 1000 short ton unit would be used, whereas a smaller land rig may only require a 500 short ton device. Various sizes of hydraulic motors, or AC or DC electric motors, are available.
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