Rigging (9)

  1. A Good Rigger's Skill Set
  2. A Rigger's Values
  3. Becoming a Rigger
  4. Qualifications & Licensing
  5. Rigging Associations
  6. Salary Profile of a Rigger
  7. What a Rigger Does
  8. What a Successful Rigger Knows
  9. What is a Rigger?

Tips & Advice (7)

  1. House Movers Depend on Heavy Load Moving Equipment
  2. Keeping Up with Federal Regulations
  3. Keeping Your Small Rigging Business Afloat - Part 1
  4. Keeping Your Small Rigging Business Afloat - Part 2
  5. Specialized Insurance
  6. Successfully Completing a Rigger Job Application
  7. Tips for Choosing a Rigger

Trends (4)

  1. Becoming an API Qualified Rigger
  2. Helicopter Rigging & Lifts
  3. Market Opportunity? Bakken Formation
  4. Understanding Rigging Design Factors

Safety (10)

  1. Critical Lift
  2. Estimating the Capacity of Chains & Hooks
  3. Evaluating Your Load's Weight
  4. Lifting People Safely
  5. Non-Critical Lift
  6. Rigging in the Aftermath of a Natural Disaster
  7. The Dangers of Shock Forces
  8. The Problem of Moving a Load with 4 Skates
  9. Who Sets the Standards for Safety?
  10. Why Does a Rigger Need Insurance?

How it Works(13)

  1. Center of Gravity
  2. Chain Slings
  3. Gravity & Rigging
  4. Hand Signals
  5. How It Works: Mobile Cranes
  6. How It Works: Stationary Cranes
  7. Lift Planning
  8. Nylon for Slings
  9. Rotational Resistant Wire Rope
  10. Spreader Bars
  11. Synthetic Rope
  12. Understanding Hydraulic Cylinders Part 1 - Single & Double Acting
  13. Which Sling is Right for the Job?

Synthetic Rope

Unlike string, line, or thread, rope is a twisted or braided length of fibers that exhibits increased strength. Rope is made from natural and synthetic fibers as well as from steel. Synthetic rope enjoys widespread popularity for its many advantages.

Rope Construction
Rope is formed by either twisting or braiding individual strands of fibers. The two methods are shown below:

Synthetic Rope Types

Uses And Limitations
Compared to steel wire rope, synthetic rope by its very nature is limited to light load lifting applications and for strapping and tethering, as in a tag line.

OSHA defines a tag line as “a rope (usually fiber) attached to a lifted load for purposes of controlling load spinning and pendular motions or used to stabilize a bucket or magnet during material handling operations . . . the end of which is held by an employee who controls the load's motion.”

Rope Material Comparisons
If a natural fiber, say manila, is considered as a basis for strength comparison, then a three-strand nylon rope has 21⁄2 times greater strength and a 2-in-1 braided nylon rope has 3 times greater strength.

Synthetic Rope Advantages

  • Superior lifting/pulling strength versus natural fiber rope
  • Outstanding strength to weight ratio (ease of handling)
  • Pliant and grips the load well without marring surfaces
  • Electrically non-conductive (eliminates potential for electrocution when used as tag line)
  • Inherently safer than wire rope with a breakage due to lighter weight
  • Safe, cost-efficient alternative to wire rope for some applications

Synthetic Rope Disadvantages

  • Limited to light load applications
  • Exhibits substantial elongation under load
  • Looses strength when subjected to temperatures greater that 150° F
  • Melts when subjected to temperatures exceeding 300° F, friction points for example

The Future
The potential of rope constructed of ultra high molecular weight polyethylene fibers (UHMPWE) to replace wire rope in logging applications is proving to be successful. UHMPWE rope's strength is similar to steel wire rope of the same nominal diameter but it weighs only about 1/9th as much. (Reference: