Choke Angle Effect Chart - Lone Star Rigging

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Persons are not to ride on sling or load.
For use in abnormal conditions of heat, cold, chemical activity, consult the manufacturer.
 Round slings must be used with compatible fittings, hooks and shackles
Bunching of material reduces capacity.
Pad edges to avoid damage to sling.
Care:
 Store away from possible mechanical damage, corrosion, dust, grit, and extreme
temperatures.
Repair:
Any hazardous condition disclosed by an inspection shall require repair or replacement.
Field repair is not permitted.
Only manufacturers or other qualified persons may make repairs.
Angle
Factor
90°
1.0000
80°
0.9848
75°
0.9659
Instructions for inspection use, care, and repair
70°
0.9397
65°
0.9063
Inspection:
60°
0.8660
 Before each use: Check tag to confirm that sling is rated adequately for the load.
55°
0.8192
 Inspect cover for holes, tears, cuts, abrasive wear-weld splatter or snags that expose
50°
0.7660
45°
0.7071
load carrying yarns, acid or caustic burns or evidence of heat damage.
Inspect hardware for distorted, cracked, worn fittings. If this wear or damage is present or
40°
0.6248
35°
0.5736
if load tag is missing or illegible remove from service and repair or replace sling.
30°
0.5000
Frequent inspection is done by the person handling the sling before each use and must
include all of the before use items.
Because of the greatly reduced lifting capacity, use extra care when the sling to load angle,
Periodic inspections are required at least annually for normal service, quarterly or more
also known as the horizontal angle, is less than 45° and do not make lifts of less than 30°
frequently if in severe service or nearly constant use.
load angle. Example: A sling with adequate capacity could be broken because of increased
 Periodic inspections are performed by designated person who records the observed condition and
tension resulting from angles of less than 30 degrees. When possible, use longer slings to
determines when future use would be hazardous.
minimize angular tension by increasing the angle.
Use:
 Check weight of load.
 Check tag to confirm that sling is rated adequately for the load (see load angle chart).
Choke Angle Effect
Sling shall not be twisted, tied into knots or joined by knotting.
 Shackles and other hardware must be inspected and padded if there are edges that could cut the
Angle of Choke, deg.
Rated Capacity, % [Note (1)]
sling.
Be sure the load can’t cut the sling during the lift by padding corners, edges, protrusions or
Over 120
100
abrasive surfaces; use materials of sufficient strength and thickness.
90 – 120
87
 Center load on base (bowl) of hook unless sling hook is designed for point loading.
60 – 89
74
30 - 59
62
Balance, maintain control, and avoid jerking the load.
LOAD
0 - 29
49
Be alert for snagging of load.
 Avoid
dragging sling over rough surfaces and from under the load.
NOTE: (1) Percent of sling rated capacity in a choker hitch.
 Chocker hitch must choke on material, never on end fitting.
Stand clear of load at all times.
 Avoid exposure to acid, alkali, and temperatures over 180° F.
OVER

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