Podcast
Questions and Answers
What is the main advantage of man-made fibre ropes over natural fibre ropes?
What is the main advantage of man-made fibre ropes over natural fibre ropes?
What is a common characteristic of some synthetic ropes?
What is a common characteristic of some synthetic ropes?
What is a disadvantage of synthetic ropes when left immersed in water for a long period of time?
What is a disadvantage of synthetic ropes when left immersed in water for a long period of time?
What is Italian Hemp known for?
What is Italian Hemp known for?
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What is another name for Polyamide (PA)?
What is another name for Polyamide (PA)?
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What are the three basic materials used to make ropes?
What are the three basic materials used to make ropes?
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What is the characteristic of Manila rope that makes it suitable for pilot ladders?
What is the characteristic of Manila rope that makes it suitable for pilot ladders?
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What is the main source of Sisal fibre?
What is the main source of Sisal fibre?
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What is the elasticity of Coir rope as a three-stranded rope?
What is the elasticity of Coir rope as a three-stranded rope?
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What is the origin of Hemp fibre?
What is the origin of Hemp fibre?
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What is the main consideration for using ropes onboard ships?
What is the main consideration for using ropes onboard ships?
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What is the approximate stretch of Manila rope?
What is the approximate stretch of Manila rope?
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Why is Sisal rope not commonly used for Marine work?
Why is Sisal rope not commonly used for Marine work?
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Study Notes
The Formation of a Rope
- To effectively use and maintain ropes, you need to know what they're made of, how they're constructed, and their characteristics.
- Understanding ropes helps you identify potential damage and take measures to minimize or prevent it.
Types of Ropes
- Ropes are made from three basic materials:
- Natural Fibres
- Synthetic (man-made) Fibres
- Steel Wires
Natural Fibre Ropes
- Examples of natural fibre ropes include:
- Manila
- Sisal
- Hemp
- Coir
Manila Rope
- Made from abaca fibre, which comes from the abaca plant (banana family).
- Characteristics: smooth, glossy, strong, flexible, easy to handle, and resistant to sea-water rotting.
- Mostly used for pilot ladders.
- Stretches about 25% of its length.
Sisal Rope
- Made from aloe leaves (pineapple family).
- Characteristics: white in color, hairy surface, and swells more than Manila when wet.
- Not generally suitable for Marine work where Manila is available.
Coir Rope
- Made from coconut fibre (removed from the shell after soaking).
- As a cable laid rope, coir stretches between 60 and 100%.
- As a three-stranded rope, its elasticity is about 45%.
Hemp Rope
- Originally from Russia, now exported from other countries.
- Italian Hemp is considered the best-quality hemp, with strength one-fifth greater than top-grade Manila.
- Has been replaced by Manila.
Synthetic or Man-made Fiber Ropes
- Examples of synthetic fibre ropes include:
- Polypropylene
- Polyamide (Nylon)
- Polyester (Terylene or Dacron)
- Polyethylene
Characteristics of Synthetic Ropes
- Greater strength allows for smaller ropes to carry heavier loads.
- Greater elasticity (ability to stretch) for shock absorption.
- Some synthetic materials float, while others do not.
- Some synthetic ropes lose strength when left immersed in water for long periods.
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Description
Learn about the basics of rope construction, materials, characteristics, and how to prevent damages. Understand the strengths and weaknesses of different rope types based on their fibres.
