Alloy Chain

Alloy Chain

Operating Practices for Alloy Chain Slings

 WARNING:

  • CAN FAIL IF DAMAGED, MISUSED OR OVERLOADED.
  • INSPECT BEFORE USE.
  • USE ONLY IF TRAINED.
  • OBSERVE RATED LOAD.
  • PAD EDGES OF LOAD TO AVOID DAMAGE TO SLING.
  • DEATH OR INJURY CAN OCCUR FROM IMPROPER USE OR CARE.

 

INSTRUCTIONS FOR CARE, USE, INSPECTION AND REPAIR:

 

CARE:

  • Store on a rack away from possible mechanical damage, corrosion, dust, grit, extreme temperatures, sun and any ultraviolet light source.
  • Do not anneal (temper) alloy chain, connecting links or hooks. Hot galvanizing requires chain manufacturer’s advice.

 

USE:

  • Check weight of load.
  • Check tag to confirm that sling is rated adequately for the load (see load angle chart).
  • Sling shall not be twisted, tied into knots or joined by knotting.
  • Be sure the load can’t cut the sling during the lift by padding corners, edges, protrusions or abrasive surfaces; use materials of sufficient strength and thickness.
  • Center load on base (bowl) of hook unless sling hook is designed for point loading.
  • Balance the load.
  • Maintain load control.
  • Avoid jerking the load.
  • Be alert for snagging of load.
  • Avoid dragging sling over rough surfaces and from under the load.
  • Choker hitch must choke on sling body, never on end fitting.
  • Stand clear of load at all times.
  • Persons are not to ride on sling or load.
  • If sling is to be used in a chemical environment or in temperatures below -40° f or above 400°F. Contact manufacturer for specific recommendations.
  • When shortening chain, use only the manufacturer’s recommended alloy components.

 

INSPECTION:

Before each use, check for nicks, gouges or excessive wear.

 Inspect for bent, twisted, deformed chain or components.

 Inspect for heat damage, weld spatter, pitting or corrosion, increase in hook throat opening, missing latch (if so equipped). If this wear or damage is present, if rated load tag is missing or illegible, remove from service and repair or replace sling. Periodic inspections are required at least annually for normal service, quarterly or more frequently if in severe service or nearly constant use. Periodic inspections are performed only by chain manufacturer or other designated person who records the observed condition and determines when further use would be hazardous.

 

REPAIR:

Any hazardous condition disclosed by an inspection shall require repair by chain manufacturer or other qualified person.

 

 

LOAD ANGLE CHART

Angle

Factor

 

Angle factor must be applied to

calculate the reduced sling capacity

when lifting force is not at 90° to the

plane of the load.

 

Multiply angle factor x sling’s vertical

rated load to calculate the reduced

capacity at that angle.

 

 

 

90°

1.0000

80°

0.9848

75°

0.9659

70°

0.9397

65°

0.9063

60°

0.8660

55°

0.8192

50°

0.7660

45°

0.7071

40°

0.6248

35°

0.5736

30°

0.5000

 load.jpg

Because of the greatly reduced lifting capacity, use extra care when the sling to load angle, also known as the horizontal angle, is less than 45° and do not make lifts of less than 30°load angle. Example: a sling with adequate capacity could be broken because of increased tension resulting from angles of less than 30°. When possible, use longer slings to minimize angular tension by increasing the angle.

 

CHOKE ANGLE EFFECT  
Angle of Choke Rated Capacity*
OVER 120° 100%
90°-120° 87%
60°-89° 74%
30°-59° 62%
0°-29° 49%
**PERCENT OF SLING RATED CAPACITY IN A CHOKER HITCH.
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