The goal of a sling inspection is to evaluate remaining strength in a sling which has been used previously to determine if it is suitable for continued use. When inspecting web slings, daily visual inspections are intended to detect serious damage or deterioration which would weaken the strength and integrity of the sling.
While a web sling has a higher resistance to mildew, rot, some chemicals, and abrasion—they can still be damaged to the point where they need to be removed from service. This inspection is usually performed by the person using the sling in a day-to-day job.
ASME B30.9 standards specify that a synthetic web sling shall be removed from service immediately if any of the following conditions are present:
Missing 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 wear or abrasion
Knots in any part of the sling
Discoloration and brittle or stiff areas on any part of the sling, which may indicate chemical or UV damage
Fittings that are pitted, corroded, cracked, bent, twisted, gouged, or broken
For hooks, removal criteria as stated in ASME B30.10
For rigging hardware, removal criteria as stated in ASME B30.26
Other conditions, including visible damage, that cause doubt to the continued use of the sling
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