Nylon slings are one of the more common tools a dogman and rigger will use. They have their advantages over chains as they are kinder to the load being lifted. When attaching directly to items such as vending machines, motors, painted metal, plaster board you generally use nylon slings as chains would mark / damage these objects somewhat.
Slings are classified by color and black stripes. This is a rule of thumb and you need to always refer back to the tag for lifting capacity but each black stripe represents each tonne of capacity eg. 2 stripes 2 tonne sling
Color coding is as follows
Purple = 1 tonne capacity straight lift
Green = 2 tonne capacity straight lift
Yellow = 3 tonne capacity straight lift
Grey = 4 tonne capacity straight lift
Red = 5 tonne capacity straight lift
Brown = 6 tonne capacity straight lift
Blue = 8 tonne capacity straight lift
Orange = I have seen both 10 tonne and 20 tonne slings that are orange
Slings often have a number of black stripes to indicate capacity, as the picture shows 3 black stripes for 3 tonne capacity
There are mostly two types of nylon slings you will use - endless and flat webbed slings. The endless is endless and the flat webbed has eyes at either end
To make slings last
Store nylon slings out of the sun. UV light breaks down and weakens the slings so the longer they are out of sunlight the longer they will last
Nylon slings should NEVER be used to lift reo bars, the bars will tear the slings enough that they are no longer usable, also be careful with steel wall framing this can have sharp edges also.
The object may require some packing to protect it and the slings on its corners. A piece of cardboard or rubber is often sufficient or you can purchase a plastic that sits on the corners.
Dont leave slings on the ground, dirt ages the sling and can get into the core causing wear to the sling.
Keep away from heat, if you are cutting with an oxy torch or a grinder make sure the slings are a safe distance away, nylon slings melt extremely easily.
Chemicals can also damage slings so make sure they are not stored where chemical exposure can occur.
Mildew will damage slings so make sure they are stored in an area free from moisture
If possible the best way to store slings is to make a wall rack and hang them off that inside, we use a small shipping container, by hanging off the wall they stay nice and dry, if you fold up and store in a tool box they can get musty.
If sling has damage such as cuts or tag is missing or unreadable you should not use the sling, it should either be replaced or if possible reinspected by the manufacturer, repaired and re tagged. Nobles offers this service, its not feasible to do on the smaller 1 or 2 tonne slings but for the 10 or 20 tonne slings defiantly worth while.
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I forgot to mention but how a load is hooked up and the type of load affects the slings lifting capacity. Once you have been a dogman for a bit you are always aware of this. As you can see hooking up a square load via a 'reeve' or 'choke' reduces the capacity by 50%, its 25% on a round load. A basket hits on a round load doubles the load capacity eg a 1 tonne sling can lift 2 tonnes. 2 slings directly attached to a load with an angle of 120 degrees reduces the capacity by 50%
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