Web Sling Information
Both nylon and polyester webbing have a low water absorption rate, making them flexible, light, and easy to handle even after prolonged soaking in water. Both also show excellent resistance to most mildew and fungus, although dirt that accumulates on slings may support their growth, and that's why regular cleaning is very important.
Inspect your sling before each use since tensile strength may decrease with each use. Web slings should be stored in a cool, dry, and dark place.
Web bridle slings can consist of two or more legs and provide excellent load stability when the load is equally distributed among all legs. Normally the leg with the smallest horizontal angle will carry the greatest load. That means you should use the smallest horizontal angle when you calculate the actual leg load and evaluate your sling’s rated capacity.
Adjusting choker hitch rated capacity
When a choker hitch is drawn tight at an angle of less than 120°, you’ll need to reduce the hitch’s rated capacity to allow for loss of rated capacity as the chart shows. Our tests have shown that when the angle was less than 120°, the sling body always failed at the point of choke when pulled to maximum. You must always allow for this anytime you use a choker hitch to shift, turn or control a load, or when the pull is against the choke in a multi-leg lift.
Consideration must be given to the angle at which a sling is to be used. Any angle from vertical will decrease the sling’s capacity. The amount of lost capacity is determined by the “sling to hook angle,” shown as Angle “A.” To calculate the capacity of a sling at an angle multiply the sling’s load rating by the appropriate factor in the “Sling Load Chart.” This will give you the sling’s reduced rated capacity.
|After web nominal strength has been adjusted by applying the fabrication factor, the sling’s rated capacity is then determined by using a design factor of 5 to 1, as specified by American National Standards Institute (ANSI) standard ANSI B30.9, Section 9 - 5.2. ANSI and OSHA both require sling manufacturers to document published sling ratings with records of test data.|
Initial Inspection - whenever the sling is initially received, altered, modified, or repaired.
Frequent Inspection - before each shift or day in normal service.Written records are not required for frequent inspections.
Periodic Inspection - an inspection done by a qualified and designated person and other than the person who performs the frequent inspections. Periodic inspection intervals should not exceed one year. Documentation that the most recent periodic inspection was performed shall be maintained.
The frequency of inspection depends on three important factors:
Following are some things to look for when inspecting a web sling for damage: