[WRE | SPOTLIGHT]


Photo courtesy of Lifting Gear Hire


basically, don’t leave it outside so it may get run over by a crane. Steel is not impervious to destruction. A rack is permissible to house your slings when not in use. Custom racks can also be constructed to accommodate slings of any size should a sling not adhere to typical rack sizes.


As with most machines, wire rope is lubricated at the time of its own manufacture. No supplementary lubrication is generally required if the sling has been used under typical conditions, but if a sling was stored outside or in any environment that could cause corrosion, it is advisable to apply additional lubrication to prevent the onset of rusting or corroding. If in the event the wire rope needs to be re-lubricated, the same type of lubrication during manufacture must be applied. Te temperature of its storage also plays an


important role in preserving the lifespan of a sling. It’s generally accepted and agreed that steel cored slings shouldn’t be used at temperatures above 400F or below -40F. Although it’s not always easy to see when a sling has been damaged by temperature-related causes, a general rule of thumb is that if there are any suspicions that a sling’s integrity may have been compromised, it should be taken out of service right away or at the very least the manufacturer should be consulted. (Wire Rope Sling Users Manual, 134)


Minimum Sling Lengths


Cable laid and 6x19 and 6x37 slings shall have a minimum clear length of wire rope 10 times the component rope diameter between splices, sleeves, and end fittings. If you have a one-inch sling, then you have to have 10 diameter lengths in between the splices so you have to have a minimum 10 inches between the knuckles.


Braided slings shall have a minimum clear length of wire rope 40 times the component rope diameter between the loops or end fittings. Cable laid grommets, strand laid grommets, and endless slings shall have a minimum circumferential length of 96 times their body diameter. (Rigging Gear Inspector Levels I & II, 42)


Safe Operating Temperatures


When steel-cored wire rope slings of any grade are used at temperatures above 400 deg. F or below minus 60 deg. F, recommendations of the sling manufacturer regarding use at that temperature shall be followed. Tis is because the metallurgy of the steel start to realign above those temperatures. If something has been used in or is planning to be used above those temperatures, consult the manufacturer of the sling to prevent degradation. (Rigging Gear Inspector Levels I & II, 42)


22


JULY–AUGUST 2017


WIRE ROPE EXCHANGE


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