Rope Formation and Ferrule Use in Aluminium

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Questions and Answers

What is the maximum length that the tail should protrude through a square-cut ferrule?

One half of the rope diameter (correct)

Two rope diameters

One rope diameter

One quarter of the rope diameter

When should the tail protruding from a ferrule be equal to the diameter of the rope?

When the rope is cut with a heat process (correct)

When the rope is not properly engaged

When using square-cut ferrules

When the ferrule is of tapered design

What is a critical step when using tapered ferrules according to the manufacturer's guidelines?

Bending the tail end to form an eye

Following the manufacturer's instructions for fitting (correct)

Cutting the rope at an angle

Ensuring the tail remains visible at all times

What formation is created when three strands of a rope are unravelled for a Flemish eye?

Y formation Signup and view all the answers

What should be done to ensure the strands stay together during the Flemish eye process?

Ensure they lay together as they had in the rope Signup and view all the answers

In the context of using square-cut ferrules, what happens if an annealed section is within the ferrule?

It can weaken the joint connection Signup and view all the answers

What is the purpose of the small view hole in a tapered ferrule?

To see the tail end of the rope Signup and view all the answers

Which part of the rope forms the eye when creating a Flemish eye?

The core portion of the rope Signup and view all the answers

What factor affects the working load limit of a wire rope sling?

Size and tensile strength of the rope Signup and view all the answers

How does a steel core rope generally compare to a fibre core rope?

Higher breaking load but less flexible Signup and view all the answers

Why might double part legs be preferred for certain applications?

They provide more flexibility Signup and view all the answers

What is one of the factors that can affect the geometry of a sling?

Angles between the legs and the vertical Signup and view all the answers

Which method of rating might be used for wire rope slings?

Uniform load method Signup and view all the answers

What is a disadvantage of using double part legs in wire rope slings?

They cost more than single part legs Signup and view all the answers

In terms of breaking loads, how do different constructions of rope with equal tensile strength compare?

They have the same minimum breaking loads Signup and view all the answers

What is a key benefit of using a rope with a fibre core?

Greater flexibility Signup and view all the answers

What is a key disadvantage of fibre rope slings compared to wire rope and chain slings?

They are bulkier to handle. Signup and view all the answers

What is the preferred method for rating multipurpose slings?

The uniform load method Signup and view all the answers

Which method is used to create eyes at the ends of fibre rope slings?

Hand splicing. Signup and view all the answers

Which of the following slings present a hard point contact to the load?

Chain slings. 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

Who should assess the SWL marked on a sling?

A Competent Person Signup and view all the answers

What is the advised practice when using multi-leg fibre rope slings with a master link?

Use thimbles to protect the eyes. Signup and view all the answers

What happens to chain after the links have been welded?

It undergoes heat treatment Signup and view all the answers

What characteristic of fibre rope slings has contributed to their decline in use?

They are less pliable than newer slings. Signup and view all the answers

Which type of chain slings is no longer available?

Mild steel chain slings Signup and view all the answers

What defines the term 'endless fibre rope slings'?

Slings formed by splicing one cut end to the other end. Signup and view all the answers

What characteristic does a heat treatment process provide to chain links?

Enhanced strength and toughness Signup and view all the answers

In terms of splicing, what influences whether the requirements differ for various types of rope?

Coefficient of friction of the rope. Signup and view all the answers

What should the SWL marked on the sling typically be?

The same as the WLL under normal conditions Signup and view all the answers

How do fibre rope slings compare visually with other fibre types?

They appear much the same. Signup and view all the answers

What is the consequence of using chain slings incorrectly?

It could result in serious incidents Signup and view all the answers

What is the primary purpose of using a shackle with a small jaw opening?

To ensure proper articulation of the connection Signup and view all the answers

In what scenario are Bow shackles generally preferred over Dee shackles?

For more than one attachment to be made Signup and view all the answers

What type of shackle pin is commonly most suitable for various applications?

Screw pin with eye and collar Signup and view all the answers

What problem can arise from using screw pins in applications subject to movement and vibration?

They can loosen and unscrew Signup and view all the answers

Which pin type is ideal when a permanent connection is necessary?

Bolt with hexagon head and cotter pin Signup and view all the answers

What is a potential drawback of using screw pins in conditions with significant movement?

They can unintentionally unscrew Signup and view all the answers

For applications that need multiple attachments to be made to the body, which shackle is most suitable?

Bow shackle Signup and view all the answers

Which type of shackle pin provides a solution to the issue of unintended loosening?

Bolt, nut, and split cotter pin Signup and view all the answers

Study Notes

Aluminium and Ferrules

Under pressure, aluminium forms a homogeneous joint when used in rope formations.
Square-cut ferrules require the rope's tail to protrude slightly, not exceeding half the rope diameter, ensuring full engagement.
For heat-cut ropes, the protruding tail should not exceed one full diameter, avoiding annealed sections within the ferrule.

Tapered Ferrules

Tapered ferrules keep the tail end contained, necessitating strict adherence to manufacturer fitting instructions.
Some ferrules feature view holes to check the tail position.

Flemish Eye

The tapered steel ferrule is slipped over the rope, with the standing part unwound to form a 'Y' shape.
It’s crucial for the strands to remain aligned as originally laid in the rope.

Rating of Wire Rope Slings

Working load limit (WLL) factors include rope size, tensile strength, core type, number of parts per sling leg, geometry, and rating method.
Steel core ropes have higher breaking loads but are less flexible than fibre core ropes.
Double leg slings offer flexibility, preferred for large capacities despite higher costs.
Maximum rated angle for slings is 60° (120° included angle), with 45° (90° included angle) as the usual working rating.
SWL marking should be assessed by a competent person, matching or being lesser than WLL based on conditions.

Chain Slings

Chains are fabricated by machine processes that shape, form, and weld steel links, followed by heat treatment for desired properties.
Wrought iron chain slings are obsolete; mild steel chains have been out of use since the early 1980s due to safety standards.
Chain slings are robust compared to wire ropes but require proper usage to prevent damage.

Fibre Rope Slings

Fibre rope slings, historically significant, have declined in favor of modern textile slings.
These slings are made by hand-splicing cut lengths of rope, resulting in heavier and less pliable products.
Available in single leg, multi-leg, or endless configurations.
Splicing forms eyes by tucking strands back into the rope, ensuring they lock when loaded.

Identification and Shackle Use

Different fiber types can visually appear similar; the choice of shackles affects lifting operation.
Dee shackles are suited for joining two pieces of equipment; bow shackles accommodate multiple attachments.
Common shackle pin types include screw pins and safety pins.
Screw pins are versatile but can loosen under vibration; bolt-and-nut pins ensure a stable connection.

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Description

This quiz explores the process of aluminium flowing into rope formations and the importance of ferrule secured eyes in ensuring a secure joint. It covers the technical specifications necessary for optimal engagement of the rope within the ferrule and the effects of heat cutting on rope integrity.