Rope Techniques and Stirrups

Questions and Answers

What should be the minimum peripheral length of a soft eye?

Five times the rope lay length

Three times the rope lay length

Four times the rope lay length (correct)

Six times the rope lay length

Why is a stirrup thimble used in choked situations?

To provide additional grip

To protect the rope from damage (correct)

To extend the lifespan of the sling

To prevent the rope from tangling

How many tucks should be made in a hand-spliced eye against the lay of the rope?

Five tucks (correct)

Four tucks

Six tucks

Three tucks

What is a potential disadvantage of making a hand-spliced eye with tucks in the lay of the rope?

It tends to undo if the rope rotates in use Signup and view all the answers

What typical device has been used to make temporary eyes in wire rope?

Bulldog grips Signup and view all the answers

Why are bulldog grips not recommended for the manufacture of slings?

They do not give an acceptable or consistent level of safety Signup and view all the answers

In the construction of a rope sling, which part is compressed and grips the rope after assembly?

The ferrule Signup and view all the answers

Which splice type is less popular than the ferrule secured eye but still preferred by some users?

Hand-spliced eye Signup and view all the answers

What is the preferred method for rating multipurpose slings?

Uniform load method Signup and view all the answers

What is the maximum angle of inclination at which a sling may be rated?

60° Signup and view all the answers

What must the SWL marked on the sling be assessed by?

A Competent Person Signup and view all the answers

What determines the maximum load that can be lifted by a sling?

The method of use Signup and view all the answers

Which material chain slings have been obsolete since the early 1980s?

Mild steel Signup and view all the answers

How is a chain made?

By shaping and welding lengths of steel bar Signup and view all the answers

What process does chain undergo after welding to achieve desired properties?

Heat treatment Signup and view all the answers

What could potentially result from incorrect use of chain slings?

Damage and serious incidents Signup and view all the answers

What is the primary purpose of shackles in lifting operations?

To connect a load directly to a lifting appliance. Signup and view all the answers

Which material provides a higher safe working load for shackles?

Higher quality alloy steels Signup and view all the answers

What distinguishes shackles manufactured to older standards from those made to current standards?

They specify all dimensions of the shackle. Signup and view all the answers

Which type of shackle is considered most common in lifting applications?

Bow type Signup and view all the answers

What is a characteristic feature of current shackle standards in their sizing?

They are sized by their working load limit (WLL). Signup and view all the answers

What are shackles primarily made from?

Various grades of steel Signup and view all the answers

Which of the following is NOT a type of shackle mentioned?

Ring shackle Signup and view all the answers

Which shackle type is specifically referenced to include both large and small options?

Dee shackles Signup and view all the answers

What type of fixings are used to secure the load pin in the clevis system?

Spiral roll pins or circlip type fixings Signup and view all the answers

Which of the following components can be used with the clevis form of chain connection?

Hooks Signup and view all the answers

What is the main advantage of using the clevis attachment system?

Minimizes the number of components necessary to assemble a sling Signup and view all the answers

How is the end link of the chain secured within the clevis attachment?

By passing it into the jaw of the clevis Signup and view all the answers

What type of link connects the chain to master links in some systems?

A simple shackle like 'coupler' Signup and view all the answers

What role does the load pin play in the clevis connection?

It secures the chain in place Signup and view all the answers

Which factor is not one of the groups considered in the rating of chain slings?

Number of components Signup and view all the answers

What is NOT a fitting associated with the clevis chain connection?

Rings Signup and view all the answers

What factors determine the amount of load carried by an individual sling leg?

The angle to the vertical and arrangement of legs Signup and view all the answers

At what maximum angle of inclination can a sling be rated without reducing its load capacity?

45° (90° included angle) Signup and view all the answers

What is the purpose of assessing the Safe Working Load (SWL) by a Competent Person?

To establish whether it meets specific conditions Signup and view all the answers

Which of the following materials is NOT commonly used to manufacture textile slings?

Steel Signup and view all the answers

What effect does a choke hitch have on sling ratings?

It reduces ratings due to higher stresses Signup and view all the answers

Which of the following is a modern material used for manufacturing specialized lifting slings?

High Modulus Polyethylene (HMPE) Signup and view all the answers

What type of sling would you most likely NOT find in service today?

Manila rope sling Signup and view all the answers

Which factor is NOT considered when determining the maximum load a sling can lift?

The age of the sling Signup and view all the answers

Study Notes

Rope Splicing Techniques

Three strands are re-laid into the rope in the opposite direction to maintain the original lay.
Ends of strands are evenly distributed around the rope for eye formation, with the ferrule compressing and gripping the rope for strength.

Soft Eye and Stirrups

Minimum peripheral length of a soft eye must be four times the rope lay length to avoid disturbing the lay.
Fitting thimbles for Flemish eyes is difficult; stirrup thimbles are used for protection against damage in choked situations.

Hand-Spliced Eyes

Hand-spliced eyes involve threading individual strands back through the main body of the rope.
Requires five tucks against the lay; tucks with the lay are banned due to potential for unravelling.

Wire Rope Grips

Temporary eyes in wire ropes, typically used in winches, are made using clamp-type grips but are not recommended for sling manufacturing.
Uniform load method is preferred for rating multipurpose slings; slings rated at 60° must only be used at a maximum of 45°.
Safe Working Load (SWL) must be verified by a Competent Person and reflects Working Load Limit (WLL) under normal or special conditions.

Chain Sling Manufacturing

Chains are produced by shaping and welding steel bars, followed by heat treatment for strength and toughness.
Wrought iron and mild steel chain slings are obsolete, following updated safety standards.
Clevis connections minimize components; load pins secured with spiral roll pins or circlips lock the connection.

Rating Chain Slings

Considerations for rating include how slings attach to loads, leg geometry, and the number of legs in use.
The angle of inclination affects load carried by each leg; choke hitch reduces ratings due to higher stress at choking points.

Textile Slings

Manufactured from synthetic fibers like polyamide, polyester, and polypropylene; natural fibers such as manila and hemp are rarely used.
High Modulus Polyethylene (HMPE) is a new fiber used for specialized lifting slings, complicating identification.
An international color-coded labeling system for slings is in place to standardize markings.

Shackles as Lifting Accessories

Shackles connect loads to lifting appliances and slings, and serve various lifting configurations.
Main types of shackles: Bow, Dee, and Grab.
Shackles are usually forged from steel, with higher quality steels offering higher safe working loads (SWL).
Current standards specify maximum and minimum dimensions, contrasting with older standards that specified all dimensions fully.
Dee shackles come in large and small sizes, with all shackle standards mandating their specifications.

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Description

This quiz covers the essential techniques for re-laying strands into a rope and the proper use of stirrups. Participants will learn about the distribution of strands and the function of the ferrule in securing the rope. Test your understanding of these fundamental rope handling skills.