Chapter 8

Questions and Answers

Wire rope should be condemned if more than?

10% of the wires are broken in a length of eight diameters (correct)

9% of the wires are broken in a length of eight diameters

8% of the wires are broken in a length of eight diameters

12% of the wires are broken in a length of eight diameters

The knot used for making a back splice is a?

Reef knot

Crown knot (correct)

Figure of eight knot

Overhand knot

Block which has a hinged side is known as?

Heel block

Chain block

Snatch block (correct)

Gin Block

The advantage of using a purchase is that for a given size of wire rope?

A greater weight can be lifted Signup and view all the answers

The SWL of each block is punched on the?

Binding straps Signup and view all the answers

A lead block is used in a derrick when rigging the?

Purchase to advantage Signup and view all the answers

To make a temporary eye at one end the most useful knot is?

Bowline Signup and view all the answers

To increase the life of a steel wire rope in a crane it should be?

Greased regularly Signup and view all the answers

Proof Load of derrick/crane is?

More than safe working load Signup and view all the answers

A single sheave block is used to?

Act as a lead block Signup and view all the answers

A shackle is moused to:

Prevent the pin from slipping Signup and view all the answers

A purchase is roved to advantage when?

The pull is coming from the moving block Signup and view all the answers

Blocks are greased to?

Allow free rotation of sheaves Signup and view all the answers

The size of a manila rope is usually indicated by its?

Diameter Signup and view all the answers

When rigging the bosun chair the gantline is secured to the chair with?

Double sheet bend Signup and view all the answers

To rig a threefold purchase, what blocks are required?

Two 3-sheave blocks Signup and view all the answers

Rope should be stored?

In a dry well-ventilated space Signup and view all the answers

A gun tackle can be used?

Both to advantage and disadvantage Signup and view all the answers

The stage can be lowered over the side for shipside painting when the vessel is?

At anchor in good weather Signup and view all the answers

Greasing is carried out on equipment to?

Reduce friction Signup and view all the answers

The purpose of mousing a hook is to?

Prevent the sling from slipping out Signup and view all the answers

When a purchase is rigged to disadvantage, the pull is from the?

Standing block Signup and view all the answers

The lay of a right hand lay rope is?

Left to right Signup and view all the answers

If the sheave is cracked the sheave has to be?

Renewed Signup and view all the answers

If the gap between the sheave and the cheek plate is excessive, the wire?

Will get fouled Signup and view all the answers

Strongest rope for the same diameter is made of?

Nylon Signup and view all the answers

Grease nipples are provided on blocks for?

Lubrication Signup and view all the answers

The split pin on a shackle prevents the pin from?

Unlocking Signup and view all the answers

The power gained in a threefold purchase is?

More than a twofold purchase Signup and view all the answers

Study Notes

Wire Rope and Condemnation Standards

Wire rope should be condemned if more than 10% of wires are broken over a length of eight diameters.

Knot Types

Crown knot is used for making a back splice.
The bowline is best for creating a temporary eye at the end of the rope.

Block Types

A snatch block has a hinged side, allowing for easy rope insertion.
A lead block is employed in a derrick to rig a purchase to advantage.
A single sheave block acts as a lead block.

Purchase and Load Management

A purchase allows for lifting a greater weight than the size of the wire rope suggests.
The proof load of a derrick or crane is always more than the safe working load.
Greasing blocks allows for free rotation of sheaves, crucial for operational efficiency.

Equipment Specifics

Each block's Safe Working Load (SWL) is indicated on binding straps.
Shackles are moused to prevent the pin from slipping.

Rope Management

Manila rope size is indicated by its diameter; should be stored in a dry, well-ventilated space.

Rigging Practices

When rigging a bosun chair, a double sheet bend secures the gantline to the chair.
For a threefold purchase, two 3-sheave blocks are required.

Maintenance and Safety

Greasing equipment reduces friction, enhancing lifecycle and performance.
The split pin on a shackle prevents the pin from unlocking or coming loose.

Practical Applications

A gun tackle can be utilized both to advantage and disadvantage based on the rigging situation.
The stage can safely be lowered for shipside painting when the vessel is at anchor.

Ropes and Materials

Nylon is the strongest rope material for the same diameter.
Excessive gaps between the sheave and cheek plate can lead to fouling of the wire.

General Terminology

Right-hand lay rope configuration means the rope spirals from left to right.
Cracked sheaves must be renewed for safe operation.

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Test your knowledge on wire rope and condemnation standards, knot types, and block functionalities. This quiz covers essential topics such as purchase and load management, equipment specifics, and effective rope management practices. Perfect for those in the rigging and lifting industry!