January 2019
Page 9
WIRE ROPE
Wire Rope Handling and Storage
Always wear gloves to protect your hands when working with wire rope.
Store wire rope in a coil or on a spool.
Protect rope from physical abuse, inclement weather, and corrosive materials.
Do not drop wire rope from any height.
Uncoil wire rope carefully to avoid kinking or inducing a twist.
Do not uncoil by tossing coil over the edge of a structure.
Avoid dragging wire rope in dirt or around objects that could scrape, crush, bend or damage it.
Galvanized wire rope specified by Sky Climber, LLC is lubricated at the factory and under normal
conditions does not require further lubrication.
Wire Rope Preparation
Always use 5/16 inch wire rope of the proper length and construction.
5/16 inch, G, XIP, RL, PRF **
Braze both ends a maximum of 1/2 inch in length.
Air cool, then grind the tip to a blunted point.
**
G = Galvanized
XIP = Extra Improved Plow
RL = Right Lay
PRF = Preformed
Wire Rope Rigging
Always use correct size and type of rope clamps. Wire rope will slip through oversize clamps.
Undersize clamps will damage wire rope.
Use only 5/16 inch J-type wire rope clamps with a minimum of three clamps spaced from 2-4 inches
apart.
Do
NOT
use U-type clamps which can crush wires and reduce wire rope strength.
Torque J-clamps to 30ft.-lb. at first loading. Check for tightness at the start of each work shift.
Clamps do loosen with use!
After all J-clamps are placed, test for 100% proof load. Retighten clamps to specifications.
Use a 5/16 inch thimble and a 5/8 inch shackle.
Use insulated thimbles when welding from platform.
Wire rope must support 6:1 safety factor.
A properly made 5/16 inch wire rope will have a minimum breaking strength of 9,400 lbs.
Rig from the top of structure. Allow an extra 10 feet of wire rope to reeve hoist. Store extra rope on
roof neatly coiled, tied, and protected from the weather.
Wire rope must be rigged to remain vertical with suspension points directly above the hoist entrance
guide or lead-in device.
CAUTION: If the wire rope length is less than required to LAND the platform on a safe surface, after
reeving the hoist, loop the bitter end of the wire rope and secure with a J-clamp. Failure to do so may
result in personal injury or death. Remove J-clamp before de-reeving hoist.
!
WARNING
Wire rope is an expendable item. It begins to wear when it is put into
use. Do not use kinked, bird-caged, excessively worn or damaged
wire rope. Such use may result in injury or death to yourself or others.
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