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Nylon Sling Inspection & Checklist

Nylon Sling Damage Inspection Checklist

Why Nylon Lifting Sling Inspection is Important

No matter how durable your nylon web sling is, eventually it will wear out and need to be replaced. Inspecting a web lifting sling before each use does not only protect the load your lifting but the people working on the job site. From cuts and abrasions to chemical and heat damage there are several factors that can lead to a damaged sling. Following the below nylon sling check list for synthetic sling inspection will ensure each time the sling is used to lift an object, everyone and thing is safe according to standards like ASME B30.9.

How to Inspect a Web Sling

Web Sling Cut DamageSling Damage: Surface and Edge Cuts It is important to realize that all of the fibers in web slings contribute to the strength of that sling. When there have been a significant number of fibers broken in a nylon web sling, as shown here, that sling should be taken out of service.

What To Inspect: During your hoist inspection checklist, look for broken fibers. Broken fibers of equal length indicate that the sling has been cut by an edge. Red core warning yarns may or may not be visible with cuts and are not required to show before removing slings from service.

How to Prevent: Always protect synthetic slings from being cut by corners and edges by using wear pads or other devices.

Web Sling Hole DamageSling Damage: Holes, Snags, and Pulls
What To Inspect: Punctures or areas where fibers stand out from the rest of the sling surface.

How to Prevent: Avoid sling contact with protrusions, both during lifts and while transporting or storing.

Web Sling Abrasion DamageSling Damage: Abrasion

What To Inspect: Areas of the sling that look and feel fuzzy indicate that the fibers have been broken by being subject to contact and movement against a rough surface. Affected areas are usually stained.

How to Prevent: Never drag slings along the ground. Never pull slings from under loads that are resting on the sling. Use wear pads between slings and rough surface loads.

Web Sling Heat and Chemical  DamageSling Damage: Heat and Chemical

What To Inspect: Melted or charred fibers anywhere along the sling. Heat and chemical damage can look similar and they both have the effect of damaging sling fibers and compromising the sling's strength. Look for discoloration and/or fibers that have been fused together and often feel hard or crunchy.

How to Prevent: Never use nylon or polyester slings where they can be exposed to temperatures in excess of 200° F. Never use nylon or polyester slings in or around chemicals without confirming that the sling material is compatible with the chemicals being used.

Web Sling Knot DamageSling Damage: Knots These compromise the strength of all slings by not allowing all fibers to contribute to the lift as designed. Knots may reduce sling strength by up to 50%.

What To Inspect: Knots are rather obvious problems as shown below.

How to Prevent: Never tie knots in slings and never use slings that are knotted.

Web Sling Stitching  DamageSling Damage: Broken/Worn Stitching The main stitch patterns of web slings has a direct adverse effect on the strength of a sling. The stitch patterns in web slings have been engineered to produce the most strength out of the webbing. If the stitching is not fully intact, the strength of the sling may be affected.

What To Inspect: Loose or broken threads in the main stitch patterns.

How to Prevent: Never pull slings from beneath loads where stitch patterns can get hung up or snagged. Never overload the slings or allow the load edge to directly contact the stitch pattern while lifting. Never place a sling eye over a hook or other attachment whose width/diameter exceeds 1/3 the eye length.

Nylon Web Slings Checklist Standards

Web Sling & Nylon Sling inspection checklist (ASME B30.9) – A synthetic web sling shall be removed from service if conditions such as the following are present on the sling.

  • Missing or illegible sling identification.
  • Acid or caustic burns.
  • Melting or charring of any part of the sling.
  • Holes, tears, cuts, or snags.
  • Broken or worn stitching in load bearing splices.
  • Excessive abrasive wear.
  • Knots in any part of the sling.
  • Discoloration and brittle or stiff areas on any part of the sling, which may mean chemical or ultraviolet/sunlight damage.
  • Fitting that are pitted, corroded, cracked, bent, twisted, gouged, or broken.
  • For hooks, removal criteria as stated in ASME B30.10
  • Other conditions, including visible damage, that cause doubt as to the continued use of the sling.

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