Dunnage Types Quiz and Flashcards

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Questions and Answers

What is the function of spar ceilings in general cargo ships?

To secure the cargo during rough sea conditions

To facilitate ventilation in the cargo hold

To provide additional storage space for cargo

To prevent direct contact between the cargo and the ship's side (correct)

What is the primary purpose of using dunnage in cargo holds?

To facilitate easy loading and unloading of cargo

To protect sensitive cargoes from moisture and contamination (correct)

To provide structural support for the ship's hull

To increase the overall weight of the cargo for stability

Which of the following statements about wooden dunnage is true?

It is not commonly used in modern cargo ships

It must be dry before use (correct)

It can be used in wet conditions

It is primarily used for structural support

What is the purpose of using criss-cross dunnage in the absence of spar ceilings?

To prevent direct contact between the cargo and the ship's side Signup and view all the answers

What is the purpose of using top dunnage in cargo holds?

To protect the cargo from contamination and moisture Signup and view all the answers

What is the primary function of using interlayer dunnage?

To protect the underlying cargo from contamination by the top cargo Signup and view all the answers

What is the primary purpose of using floor dunnage in cargo holds?

To prevent moisture damage to sensitive cargoes like bagged goods or bales Signup and view all the answers

Which of the following is NOT considered a type of dunnage material?

Steel plates Signup and view all the answers

What is the purpose of using a double layer or criss-cross dunnage for very sensitive cargoes?

To prevent the cargo from sinking and touching the deck Signup and view all the answers

Which of the following statements about dunnage is NOT true?

Dunnage is only used on general cargo ships, not container ships Signup and view all the answers

In ships with lateral water drainage (bilges), how should the first layer of floor dunnage be laid?

Crosswise Signup and view all the answers

What is the purpose of lateral dunnage in cargo holds?

To prevent cargo from shifting during transportation Signup and view all the answers

What are the SPECIAL AREAS established under Annex V for dunnage disposal?

The Baltic Sea area and the Red Sea area Signup and view all the answers

Why is it important to clean the strum box in the bilge suction line after each cargo discharge?

To prevent cargo contamination Signup and view all the answers

What is the purpose of the bilge suction line in a cargo hold?

To discharge bilge water Signup and view all the answers

What is the main reason for blanking ballast lines when carrying cargo in ballast holds?

To prevent seawater intrusion into the cargo hold Signup and view all the answers

Why should the end of the bilge suction line be confirmed as clear with no debris fouling?

To avoid cargo contamination Signup and view all the answers

What is one of the reasons for trying out the bilge suction when the cargo hold is empty?

Verify its efficient working condition Signup and view all the answers

Study Notes

Use of Dunnage

Dunnage is used to protect sensitive cargoes from contamination, and additional materials such as jute coverings, paper, and matting may be used.
Spar ceilings, which are wooden planks connected to the ship, prevent direct contact between the cargo and the ship's side and allow sweat to flow downwards.
In the absence of spar ceilings, dunnage or criss-cross dunnage must be used to protect the cargo from contamination.

Types of Dunnage

Floor dunnage protects moisture-sensitive cargoes from sweat and lifts the cargo off the deck.
Lateral dunnage protects the cargo from contamination.
Interlayer dunnage separates individual batches of cargo and protects the underlying cargo from contamination.
Top dunnage protects against moisture and contamination.

Importance of Dunnage

Floor dunnage is the most important type of dunnage on general cargo ships.
Dunnage is essential for protecting sensitive cargoes, such as bagged cargo and bales, from sweat and moisture.

Disposal of Dunnage

Special areas have been established under Annex V for the disposal of dunnage, including the Mediterranean Sea area, Baltic Sea area, and others.

Bilge Suction

The bilge suction line is fitted with a perforated strum box to prevent cargo debris from entering the bilge line.
The strum box must be thoroughly cleaned after each cargo discharge and checked for damage or corrosion.
Bilge suction is necessary to remove residue of previous cargo, clean the mud and rust, and get rid of foul smells.
The bilge suction line must be confirmed as clear and free of debris before use.

Blanking of Ballast Lines

Ballast holds can be used for either ballast or cargo.
When carrying cargo, it is essential to ensure that ballast water cannot be admitted to the hold by accident.
This is achieved by bolting a watertight coverplate over the ballast suction in the hold and reinforcing it in the engineroom or on deck.

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Description

Learn about the different types of dunnage used on general cargo ships and their importance in protecting moisture-sensitive cargoes from sweat. Explore floor, lateral, interlayer, and top dunnage.

Types of Dunnage on General Cargo Ships

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