Figure 9-12.-Top-head drive ISO/air-transportable water well drilling rig.of 10 mph over unpaved roads and has a cross-countryrough terrain capability.ITWD ComponentsThe ITWD derrick consist of the telescoping maststructure, the pulldown/pullback mechanism, thetop-head assembly, and the hoist assembly. Othercomponents are a stabilization system, main frame,handling equipment, hydraulics, control console, and soforth.The drill derrick system is capable of generating15,000 pounds pulldown and 30,000 pounds pullbackforce through the top-head during the drilling operation.The top-head drive is a variable speed drive that impartsrotation and torque to the drill pipe for drilling and hasan rpm range from 0 to 200 rpm. The tophead drive ismounted to a carriage that is free to move up and downover the length of the moving mast section. The topheaddrive also has a hollow spindle for injection of air ormud, giving the ITWD capabilities for rotary air orrotary mud drilling.The hoist system is attached to the side of the derrickand operates independently of the derrick operation andis rated for a 3,000-pound hook loading. This capacityis sufficient to add and remove 18.5-foot drill pipes andto set typical 20-foot casing and surface pipe. The hoistis capable of lifting up to 180 feet of 4 1/2-inch drill pipewhen “tripping out” the drill hole. When increasedhoisting is required for lifting longer drill strings, thetop-head drive that has a capacity equivalent to its9-11
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