TM 5-3820-256-10i.Assemble a coupling to a section of casing and install the casing elevators below the coupling.j.Use the auxiliary drum line to lift and position the casing over the strainer coupling. Lower casing into strainercoupling and install nylon locking spline.k. Lift the assembly to remove the clamp; then lower until the elevators rest on the mud pit overflow pipe.I.Repeat the procedure, adding casing as needed for the full depth of the well.NOTEIn the event there is a second water bearing formation above, sections of slotted casing (see figure 2-45)may be substituted for regular casing at that point. Slotted casing is similar to strainers, except thatslotted casing does not provide as effective filtration as the strainers.m. When all the casing is set in place, cut the top of the casing so that it is flush with the top of the mud pit overflowpipe.n. Remove the mud pits, then use scrap plastic or styrofoam packing materials to seal around the outside of thecasing at the top of the hole. Cover these materials with dirt so that the ground is level around the casing andnothing can enter the hole.2-37.Preparing to Set Pump.a. Bailing the Hole. When there is an accumulation of dirt or sand in the well, use a bailer to remove thisaccumulation (see figure 2-46).(1)Attach the third drum line to the bailer.(2)Operate the drum to lift the bailer, then lower it into the hole. Do not allow the bailer to fall too fast, andslow down when approaching the bottom of the hole.(3)When the bailer contacts the bottom of the hole, the valve at the base of the bailer opens, and the bailer fillswith sand, dirt, and water. Tie a piece of twine or cord on the cable to mark the depth at which the bailerstops.(4)Raise the bailer. As it lifts off the bottom the valve closes, trapping the sand and dirt inside. Continueraising, slowing up as the bailer nears the surface, until the bailer is out of the hole. Lower the bailer to theground away from the rig. When it contacts the ground, the bailer valve opens and discharges the bailer'scontents.2-109
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