Polyester Round Endless Slings

The polyester round endless slings are manufactured by using finest quality high tenacity polyester yarn that is hank wound continuously in the form of endless & is enclosed in a protective cover. These are manufactured as per EN 1492-2, IS and ASME standards and are available in the lifting capacity up to 500 tons. These round endless slings are available in color coded form for easy identification.

• Adaptable slings with no fixed wear points
• Higher safety factor
• Light in weight
• Non corrosive
• Economical
• Better balance of load

WORKING LOAD TABLE

Recommended Operating Practices for Polyester Round slings

• Determine weight of the load. The weight of the load shall be within the rated capacity of the polyester round sling(s).
• Select a polyester round sling having suitable characteristics for the type of load, hitch and environment.
• Polyester round slings shall not be loaded in excess of the rated capacity. Consideration shall be given to the round sling to load angle which affects rated capacities.
• Polyester round slings with fittings, which are used in a choke hitch, shall be of sufficient length to assure that the choking action is on the round sling and never on the fitting.
• Polyester round slings used in a basket hitch shall have the load balanced to prevent slippage.
• The openings in fittings shall be the proper shape and size to ensure that the fittings will seat properly on the polyester round sling, crane hook, or other attachments.
• Polyester round slings shall always be protected from being cut by sharp corners, sharp edges, protrusions, or abrasive surfaces.
• Polyester round slings shall not be dragged on the floor or over an abrasive surface.
• Polyester round slings shall not be twisted, shortened ,lengthened, tied into knots, or joined by knotting.
• Polyester round slings shall not be pulled from under loads when the load is resting on the polyester round sling.
• Do not drop polyester round slings equipped with metal fittings.
• Polyester round slings that appear to be damaged shall not be used unless inspected and accepted as usable.
• The polyester round sling shall be hitched in a manner providing control of the load.
• Personnel, including all portions of the human body, shall not be kept from between the polyester round sling and the load, and from between the polyester round sling and the crane hook or hoist hook.
• Personnel shall stand clear of the suspended load .Personnel shall not ride the polyester round sling.
• Shock loading shall be avoided.
• Twisting the legs (branches) shall be avoided.
• Load applied to a hook shall be centered in the bowl of the hook to prevent point loading.
• During lifting, personnel shall be alert for possible snagging of the polyester round sling.
• The polyester round slings legs (branches) shall contain or support the load from the sides above the center of gravity when using a basket hitch.
• Polyester round slings shall be long enough so the rated capacity is adequate when the sling to load angle is taken into consideration.
• Only polyester round slings with legible identification tags shall be used.
• Tags and labels should be kept away from the load, hook and point of choke.
• Polyester round slings should not be constricted or bunched between the ears of a clevis or shackle, or in a hook. When a polyester roundsling is used with a shackle, it is recommended that it be used (rigged) in the bow of the shackle.
• Place blocks under load prior to setting down the load, to allow removal of the polyester round sling, if applicable.

Environmental Considerations

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

Acids

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 consideration the following:

• Type of acid
• Exposure conditions
  
• Concentration
  
• Temperature

Alkalis :

Polyester is subject to degradation in alkalis, ranging from little to total degradation.Each application shall be evaluated, taking into consideration the following:

• Type of alkali
• Exposure conditions
  
• Concentration
  
• Temperature

Polyester round slings shall not be used at temperatures in excess of 194° F (90° C), or at temperatures below minus 40° F (-40° C).
Polyester round slings incorporating aluminum fittings shall not be used where fumes, vapors, sprays, mists or liquids of alkalis and/or acids are present, unless the compatibility of these materials is verified.

Inspection

Polyester round slings shall be visually inspected by a designated person handling the polyester round sling before each use. These visual observations shall be concerned with the identification tag and discovering damage .Polyester round slings shall be removed from service if there is any doubt as to the condition of the round sling.

Type of Inspection

A. Initial Inspection — Before any polyester round sling placed into service it shall be inspected by a designated person to ensure that the correct round sling is being used as well as to determine that the round slingmeets the requirements of this specification.
B. Frequent Inspection — This inspection shall be made by the user or other designated personnel each time the round sling is used.
C. Periodic Inspection — This inspection shall be conducted by a designated person. Frequency of inspection should be based on:

• Frequency of use
• Severity of service conditions
• Experience gained on service life of polyester Round slings used in similar applications.
• Periodic inspections should be conducted at least Monthly

Removal From Service

• polyester round sling shall be removed from service if any of the following is visible:
• If polyester round sling identification tag is missing or unreadable.
• Melting, charring or weld spatter of any part of the polyester round sling.
• Holes, tears, cuts, embedded particles, excessive abrasive wear, or snags that expose the core fibers of the polyester.
• Broken or worn stitching in the cover which exposes the core fibers.
• Fittings when damaged, stretched, corroded, cracked or distorted in any way.
• Polyester round slings that are knotted.
• Acid or alkali burns of the polyester round sling.
• Any conditions which cause doubt as to the strength of the polyester round sling.

Inspection Records

Written inspection records, utilizing the identification for each polyester round sling as established by the user,should be kept on file. These records should show a description of the new polyester round sling and its condition on each periodic inspection.

Repair of Round Slings

There shall be no repairs of load bearing fibers.Repairs to the protective covers shall be done only by the original manufacturer or their appointed agent.Only polyester roundslings, which can be identified from the information on the identification tag, shall berepaired.All repaired olyester round slings shall be proof tested toa minimum of two (2) times the rated capacity before
being put back into service. Certification of proof test should be provided.