5.5.3 Attach Transmitter-end Repair Section Segment
The TX end of the transmitter-end segment of the repair section is installed on the transmitter side of the transmission line. The procedural steps are very similar to those for the attachment of a standard section, as follows:
1. Place the transmitter-end segment on the hanger cradles, or temporary supports, with the TX end toward the transmitter. Remove the pressure gauge assembly to release the excess air pressure in the segment.
2. Remove the pressure plate at the ANT end by first removing the flange hardware. Since this plate has an integeral stud attached to the center conductor, hold the plate in position during and immediately after removal of the flange bolt. This hardware can be discarded.
CAUTION: REMOVE ALL HARDWARE CAREFULLY. Use the torque wrench assembly (#220045) and the combination wrench to loosen the hex nut. Remove the nut an lock washer. Then, use a knife or screwdriver to pry off the threadseal washer on this side. Do not remove this threadseal washer by striking the threaded end of the bolt with a hammer or similar tool. After prying off this washer, remove the bolt using care to avoid abrasion.
3. Roate the pressure plate counterclockwise to begin disengagement of the threaded stud. During the disengagement, carefully lower the plate until the inner conductor is resting against the outer conductor. Disengage completely and remove the pressure plate, using care to avoid damage to the conductors or flange.
4. Cover the ANT end of the repair section with one of the supplied plastic bags.
5. Remove the pressure at the TX end, again by first removing the flange hardware. Since this plate also has an integeral threaded stud attached to the center conductor, hold the plate in position during and immediately after removal of the final flange bolt. This hardware can be discarded.
7. For low-level supports, place repair section in position on the installed cradles of the hangers. For high-level or transmission supports, install the lifting assemblies (#221755) to the supports and attach short nylon chokers, ropes, and pulleys to the cable. Lift the cable, keeping it horizontal, until it is nesting loosely against the cradles. The TX end of the repair section mates to the transmitter side of the opened transmission line.
CAUTION: During this handling, avoid damage to the exposed inner conductor at the TX end.
8. As necessary, remove the protective coverings from the ends being mated. Align the inner conductor with the protruding inner conductor from the previous section. Engage the coupling stud and rotate the driver ring to draw the connection together. Turn the driver ring by hand until the contact surfaces are snug.
CAUTION: TO PREVENT MISENGAGEMENT, THE INNER CONDUCTORS SHOULD BE ALIGNED WELL. The driver ring should turn freely during initial tightening.
9. Attach the inner conductor tool (#220335) to the inner conductor of the previous section, with the edge of the tool about 0.25 inch (6 mm) from the edge of the driver ring.
CAUTION: NEVER ATTACH THIS TOOL MORE THAN 0.5 INCH (12 MM) FROM THE DRIVER RING EDGE. This can result in damage to the inner conductor.
10. Use the driver-ring torque wrench (#220047) to tighten this connection to a torque between 250 and 275 ft-lb. The inner conductor tool is used to hold the inner conductor of the previously installed section stationary and the torque wrench is used to turn the driver ring. Tightening is easier if the arm of the inner conductor tool is kept out of the way of the torque wrench arm.
CAUTION: USE THESE WRENCHES ONLY. They are designed to prevent damage to the inner conductor and driver ring. DO NOT ROTATE THE INNER CONDUCTOR TOOL during tightening. For a low-level installation, a tool rest is available to hold the arm of the inner conductor tool fixed.
11. This is a high contact pressure connection. After tightening, brush completely around the connection (between the driver ring and inner conductors) to remove any small filings that occur from the wiping action of the contacting surfaces. Use a soft horsehair brush or equivalent.
12. Butt one end of the pretension gauge (#220043) against the strain insulator of the previously installed section and rotate the strain insulator the edge of the driver ring is aligned with the opposite end of the gauge. This sets the proper pretension of the inner conductor of the previously installed section.