Inspection of Slings

A specific procedure for the inspection of synthetic slings is your best safeguard against sling damage and abuse. We recommend that you employ a three stage level of inspection as outlined in ASME B30.9. Note that there are no Canadian Standards for slings however, some Provinces and Ministries of Labour have issued specific inspection and removal criteria depending on where the slings are used (construction or industrial use). Consult your local authorities. In Ontario consult the O.H.S.A. Another source of information is the CSAO, Construction Safety Association of Ontario.

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Initial Inspection

This inspection is done at the time the product is first received to ensure that damage has not occurred during shipment. Also verify that the goods are in compliance with the specification of the purchase order.

Frequent Inspection

This level of visual inspection should be done by the person handling the sling, or other specifically designated personnel. Records are not required.

1. Normal service &#; daily when in use
2. Severe service &#; each use
3. Special or infrequent service &#; as recommended by a qualified person before and after each use.

Periodic Inspection

The periodic level of inspection is done by designated personnel at regular intervals. The interval is based upon the frequency of use, severity of service conditions, and information derived through the inspection process. Recommendations to prevent damage must be evaluated to improve the service life of the replacement slings. Written records must be kept.

Web Sling Inspection

Remove if you detect these damages

(Note that for educational and graphic purposes these examples are overly explicit. In service remove for much less obvious or less explicit damages)

Broken or worn stitching

Rips and snags

Crushed webbing

Missing or elligible Tags

Cuts and abrasion

Snags and damage to the edges

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Weld splatter

Embedded materials

Localized heat/open flame damage

Knots

Surface abrasion

Damaged eye

UV Degradation

Cuts

Tensile Break

Synthetic Web Slings

Synthetic web slings are regulated under the MIOSHA Part 49 Slings. Synthetic web slings must be purchased from a manufacturer who has proof tested the slings. Do not make one from synthetic webbing. Synthetic webbing is usually made from nylon or polyester; choose the correct sling based on each job.

Requirements

• A synthetic sling must have a permanently affixed, durable identification, stating the size, grade, rated capacity and reach.
• Synthetic slings must be inspected daily before using, for signs of wear and stress.
• Synthetic slings must be thoroughly inspected and the inspection documented at least every 12 months.
• The sling must be proof-tested by the manufacturer when new, repaired or reconditioned. Proof testing is a non-destructive tension test to verify construction and workmanship.
• A synthetic sling can only be repaired by the manufacturer.
• Nylon and polyester slings must not be used at a temperature of 180ºF or greater.
• Polypropylene slings must not be used at a temperature in excess of 200ºF.
• Stitching is the only method to be used to attach fittings to webbing and to form eyes.
• A web sling with aluminum fittings cannot be used when caustics are present.
• Nylon slings cannot be used when acids are present.
• Polyester and polypropylene slings cannot be used when caustics are present.

Selection and Maintenance

• Do not store slings in sunlight.
• Slings may be laundered but hang dry. Using a drying with significantly reduce their strength.
• Moisture can damage synthetic slings, store in a dry area.
• Chemicals may affect synthetic slings. Refer to the manufacturer&#;s specifications for chemical resistance.

Daily Inspection

Remove slings from service if

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• The identification tag is missing or unreadable.
• Red warning stitches or other warning devices are visible indicating that the sling has been overloaded and damaged.
• Broken or worn stitching
• Excessive abrasive wear
• Knots in any part of the sling
• Bleached sling color
• Holes, tears, cuts and snags.
• Increased stiffness of the material. Acid or caustic burns.
• Crushed webbing or imbedded particles.
• Melted or burned areas.
• Excessive pitting, corrosion, distortion or cracked metal fittings.
• Other visible damage that may change the strength of the sling.

Safe Lifting

• Refer to the manufacturer&#;s lifting tables for the load reductions when lifting with a multi-leg sling.
• Avoid kinks, loops or twists in the legs.
• Lift slowly to avoid shock loading and stressing the sling.Do not pull a sling out from under the load with the load resting on the sling. Block the load up to remove the sling.
• Do not shorten the sling by any means such as knots or bolts.
• Slings should not be loaded over the rated load.
• Make sure the sling is assembled properly before lifting.
• Make sure the periodic inspections have been done before lifting.
• The manufacturer should perform all repairs and the manufacturer must proof test all repairs.
• Consult the manufacturer if slings are used at an angle of less than 30º
• Do not drop slings if they have metal fittings.
• Sharp corners on items being lifted should be padded to avoid cutting the sling.