RK Pipe & Supply sells new and used Rotary Tables and well drilling hoisting tools for your drilling equipment needs. Please check our online inventory and contact our sales department for help and quotations.
A rotary table is a mechanical device on a drilling rig that provides clockwise (as viewed from above) rotational force to the drill string to facilitate the process of drilling a borehole.
In figure 1, #20 (in blue) is the rotary table. The kelly drive #19, is inserted through the center of the rotary table and kelly bushings, and has free vertical (up & down) movement to allow downward force to be applied to the drill string, while the rotary table rotates it. (Note: Force is not actually applied from the top (as to push) but rather the weight is at the bottom of the drill string like a pendulum on a string.)
Most rotary tables are chain driven. These chains resemble very large bicycle chains. The chains require constant oiling to prevent burning and seizing.
Virtually all rotary tables are equipped with a rotary lock. Engaging the lock can either prevent the rotary from turning in one particular direction, or from turning at all. This is commonly used by crews in lieu of using a second pair of tongs to makeup or break out pipe.
The rotary bushings are located at the center of the rotary table. These can generally be removed in two separate pieces to facilitate large items, i.e. drill bits, to pass through the rotary table. The large gap in the center of the rotary bushings is referred to as the “bowl” due to its appearance. The bowl is where the slips are set to hold up the drill string during connections and pipe trips as well as the point the drill string passes through the floor into the wellbore. The rotary bushings connect to the kelly bushings to actually induce the spin required for drilling
The distance between the center of the rotary table and the center of the first row of sprocket teeth shall be 53- 1/4 in. for machines that will pass a 20 in. bit or larger. It shall be 44 in. for machines that will not pass a 20 in. bit, except that, by agreement between the manufacturer and the purchaser, the distance of 53-1/4 in. may be used. The distance shall be 65 in. for the 49-1/2 in. rotary table opening.
Rotary table pinion-shaft extensions shall be furnished in the sizes shown in In Table 1, as specified on the purchase order, and shall conform to the dimensions and tolerances shown in Table 1 and Figure 1A.
Demountable rotary table sprockets to be mounted on the rotary table shafts are shown in Table 2 and Figure 2. The sprockets, single strand and double strand, have one common hub with identical bolt circle, number of bolts, and size of bolts. (See Table 2 and Figure 2 for shaft details)
Rotary Table openings for square drive master bushings and for pin drive master bushings shall conform to the requirements of Table 3 (based on API Spec 7K).