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Inspection, care and use of nylon and polyester synthetic web slings . . .

Removal From Service: A sling shall be removed from service if any of the following are visible:

  • If sling rated capacity tag is missing or not readable
  • Acid or alkalis burns
  • Melting, charring or weld spatter on any part of the sling
  • Holes, tears, cuts, snags or embedded particles
  • Broken or worn stitching in load bearing splices
  • Excessive abrasive wear
  • Knots in any part of the sling
  • Distortion, excessive abrasive wear
  • Any conditions which cause doubt as to the strength of the sling

Operating Practices:

  • Determine weight of the load. The weight of the load shall be within the rated capacity of the sling.
  • Select sling having suitable characteristics for the type of load, hitch and environment.
  • Slings shall not be loaded in excess of the rated capacity. Consideration shall be given to the sling to load angle which affects rated capacity. (See load charts.)
  • Slings with fittings which are used as a choker hitch shall be of sufficient length to assure that the choking action is on the webbing, and never on a fitting.
  • Slings used in a basket hitch shall have the load balanced to prevent slippage.
  • The opening in fittings shall be the proper shape and size to insure that the fitting will seat properly in the hook or other attachments.
  • Slings shall always be protected from being cut by sharp corners, sharp edges, protrusions or abrasive surfaces.
  • Slings shall not be dragged on the floor or over an abrasive surface.
  • Slings shall not be twisted or tied into knots, or joined by knotting.
  • Slings shall not be pulled from under loads if the load is resting on the sling.
  • Do not drop slings equipped with metal fittings.
  • Slings that appear to be damaged shall not be used unless inspected and accepted.
  • The sling shall be hitched in a manner providing control of the load.
  • Personnel, including portions of the human body, shall be kept from between the sling and the load, and from between the sling and the crane hook or hoist hook.
  • Personnel shall stand clear of the suspended load.
  • Personnel shall not ride the sling.
  • Shock loading shall be avoided.
  • Twisting and kinking the legs (branches) shall be avoided.
  • Load applied to the hook shall be centered in the base (bowl) of hook to prevent point loading on the hook.
  • During lifting, with or without the load, personnel shall be alert for possible snagging.
  • The slings’ legs (branches) shall contain or support the load from the sides above the center of gravity when using basket hitch.
  • Slings shall be long enough so that the rated capacity of the sling is adequate when the angle of the legs (branches) is taken into consideration. (See load charts.)

 


During lifting, with or without the load, personnel shall be alert for possible snagging.

The web slings’ legs (branches) shall contain or support the load from the sides above the center of gravity when using a basket hitch. Web slings shall be long enough so that the rated load (rated capacity) is adequate when the sling to load angle is taken into consideration. Only web slings with legible identification tags shall be used. Tags and labels should be kept away form the load, hook and point of choke. Web slings shall not be constricted or bunched between the ears of a clevis, shackle, or in a hook.

Place blocks under load prior to setting down the load to allow removal of the web sling, if applicable.

Environmental Considerations

Web slings should be stored in a cool, dry, dark place to prevent loss of strength when not in use through exposure to ultra-violet rays. Web slings shall not be stored in chemically active areas. Chemically active environments can affect the strength of synthetic web slings in varying degrees ranging from little to total degradation. The web sling manufacturer or qualified person should be consulted before slings are used in chemically active environments.

Acids.

Nylon is subject to degradation in acids, ranging from little to total degradation.

Polyester is resistant to many acids, but is subject to degradation, ranging from little to moderate in some acids.

Each application shall be evaluated, taking into consider-ation the following:

  1. a. Type of Acid
  2. b. Exposure Conditions
  3. c. Concentration
  4. d. Temperature

Alkalis.

Polyester is subject to degradation in alkalis, ranging from little to total degradation.

Nylon is resistant to many alkalis, but is subject to Degradation ranging from little to moderate in some alkalis.

Each application shall be evaluated, taking into consideration the following:

  1. a. Type of Alkalis
  2. b. Exposure Conditions
  3. c. Concentration
  4. d. Temperature

Nylon and polyester web slings shall not be used at temperatures in excess of 194° F (90° C) or temperatures below minus 40° F (minus 40° C). Web slings incorporating aluminum fittings shall not be used where fumes, vapors, sprays, mists or liquids of alkalis and/or acids are present.

Environments in which synthetic web slings are continuously exposed to ultra-violet light can affect the strength of synthetic web slings in varying degrees ranging from slight to total degradation.

Caution: Degradation can take place
without visible indications.

  1. Factors which affect the degree of strength loss are:
    1. Length of time of continuous exposure
    2. Web sling construction and design
    3. Other environmental factors such as weather conditions and geographic location
  2. Suggested procedures to minimize the affects of ultra-violet light.
    1. Store web slings in a cool, dry, dark place when not being used for prolonged periods of time.
  3. Some visual indications of ultra-violet degradation are:
    1. Bleaching out of web sling color
    2. Increased stiffness of web sling material
    3. Surface abrasion in areas not normally in contact with the load
  4. Proof Testing—Slings used in environments where they are subject to continuous exposure to ultraviolet light shall be proof tested to twice the rated capacity semi-annually, or more frequently depending on severity of exposure.

Inspection

Type of Inspection.

  1. Initial Inspection—Before any new or repaired web sling is placed in service, it shall be inspected by a designated person to ensure that the correct web sling is being used, as well as to determine that the web sling meets the requirements of this specification.
  2. Frequent Inspection—This inspection shall be conducted by a qualified person handling the sling each time the sling is used.
  3. Periodic Inspection—This inspection shall be conducted by designated personnel. Frequency of inspection should be based on:
    1. Frequency of web sling use
    2. Severity of service conditions
    3. Experience gained on the service life of web slings used in similar applications
    4. Inspections should be conducted at least annually

reprinted from Synthetic Web Slings—Web Sling & Tie Down Association