Rigging With Lifting Blocks
1. Total Load
Total Load:
Load Wt. (1000 lbs.)
+ Winch Pull (1000 lbs.)
= 2000 lbs. minimum
2. One Part of Line
No Mechanical Advantage = One
Winch Pull = 1,000 lbs.
1. Total Load
Total Load:
Load Wt. (1000 lbs.)
+ Winch Pull (500 lbs.)
= 1500 lbs. minimum
2. Two Parts of Line
3. Total Load = 1,000
Mechanical Advantage = Two
Winch Pull = 500 lbs.
Pull (P) required (level ground)
= Weight (W) X Friction Factor (F)
Many surfaces have a friction factor < 1
(f) for steel on steel is .16 lubricated
(f) for steel on steel is .8 clean
(f) for wood on metal is .2 To .6 clean
(f) for wood on wood is .25 To .5 clean
Winch Pull Required =
Weight X Friction Factor
Mechanical Advantage
Load Limits Contents
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Inspection of Slings
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Wire Rope Sling Connections and Hitches
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Chain Sling Connections and Hitches
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Web Sling and Roundsling Capacities
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Twin-Path® Extra Covermax Specifications
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Synthetic Sling Load Limits
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Wire Rope Load Limits
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Grade 100 (10) Alloy Chain
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The Basic Rigging Plan
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Inspection of Rigging Hardware
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Crosby® Wire Rope Clips
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Crosby® Links, Rings and Turnbuckles
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Crosby® Shackle and Hook Load Limits
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Crosby® Shoulder Eye Bolt and Swivel Hoist Ring Load Limits
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Center of Gravity and Sling Loading
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Sling Angles
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Risk Management
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Operating Practices and Load Control
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Block Selection and Application Guide
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Working With Blocks
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Rigging With Blocks
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Block Loading - Angle Factor Multipliers
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Sheave Inspection
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Block Hook Inspection
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Nylon Slings Load Limits
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Load Limit Definitions
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Take it with you - Get Our Load Limit App
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