Ropes & Knots Flashcards

1
Q

What is a line

A

When ropes are cut to specific lengths, they are referred to as ‘lines’. The intended use of any line will determine its construction, diameter, and length.

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2
Q

Properties of synthetic fibre ropes

A

Ability to absorb shock loads.
Ability to withstand repeated loads without failure.
Little swelling or immersion in water.
Can be stowed without degradation by rot or mildew.
Has good weight to strength ratio.

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3
Q

What is the standing part of the rope

A

The part of the line that is fixed.

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4
Q

What is the running end of the rope

A

The free end of the line.

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5
Q

What is a bight when using rope

A

The part of the line between the two ends in
which the line is doubled. When forming a
bight, the line is not crossed.

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6
Q

What is a loop when using rope

A

Formed by crossing the line over on itself.

Can be overhand or underhand.

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7
Q

What is a round turn when using rope

A

One complete line revolution around an object.

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8
Q

What is dressing a knot

A

The orientation and tightening of all the knot

parts so it is rendered ready for use.

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9
Q

Construction of sythentic fibre lines

A

ACTF&R synthetic lines are of polyamide kernmantle construction. The rope consists of a kern or core of continuous extruded filaments running the full length, designed to sustain the greatest part of the load.

The core is covered by a woven braided sheath (mantle), which supports the lesser portion of the load, but provides protection for the core against abrasion, dirt and sunlight (ultra violet rays).

This type of construction provides a rope that is strong and resistant to damage, yet is light and easy to handle.

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10
Q

What is a long line

A

ACTF&R long lines are made of 13-mm diameter kernmantle rope and are approx 15 metres long.

This line is a general-purpose line used to haul any portable equipment aloft and to lower or secure equipment. The breaking strain is approx 4000 kg with a safe working load of 500 kg.

A long line is carried on all pumping appliances stuffed into its own bag. A synthetic long line is not to be used for towing vehicles.

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11
Q

What is a pocket line

A

This is made of 6-mm diameter kernmantle rope and is 3 metres long. It can be used for securing hose to ladders, thereby relieving the branch holder of the weight of hose and water, securing the head of a ladder, or any other general-purpose need.

All Firefighters are issued with a pocket line to carry in their tunic.

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12
Q

What causes rope deterioration

A

Mechanical deterioration to external or internal due to local abrasion, cuts, contusions, overloading.
Chemical deterioration due to chemical attack, heat, sunlight.
Mildew does not affect synthetic lines but it will grow on surface impurities if lines are stored wet and dirty. Discolouration of the fibres will also occur.

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13
Q

How to avoid deterioration

A

Avoid storing lines near generators, batteries or industrial processes.
Thoroughly wash and dry any lines that have been used in mud, sand or grit.
Store lines away from exposure to heat and direct sunlight.
Know the causes of damage to lines and avoid them.
Store in bags.

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14
Q

When to inspect lines

A

Lines are to be inspected weekly (Monday check) and before, during and after use.

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15
Q

What to look for when inspecting lines

A

Any signs of local abrasion.
Sheath wear may indicate that fibres on the sheath are cut. This will produce a furry look to the line.
Any sign of cuts, nicks and contusions.
Exposed core fibres indicate damage to sheath and/or core.
Any reduction in diameter and excessive elongation of the lay.
Lack of uniformity in diameter size may indicate core damage.
Any signs of discolouration and softening or powdering of the fibres.
Discolouration and powdering indicate dirt or chemical damage.
Signs of charring, singeing or heat damage.
In synthetic lines, glossy marks can indicate heat damage.

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16
Q

What to feel for when inspecting lines

A

Stiffened fibres - indicates aged line or heat damage.
Changes in the diameter - core damage
Soft spongy areas indicating core damage.

17
Q

How to wash a line

A

Wash in cold water with a mild soap such as Velvet laundry soap. (Hot water can stretch the fibres.)
Agitate the line in the water. Do not leave to soak.
Do not use bleach or solvents.
Rinse the line thoroughly in clean, fresh water
Dry the line away from direct sunlight.
Do not dry in drying rooms or dryers.

18
Q

When to report and replace a line

A

Lines should be reported damaged and replaced when:

Excessive sheath wear is noted on synthetic lines.- when more than
Half of the sheath fibres are cut or broken
The line has been subjected to a severe shock loading, ie. Over the lines safe working load by approximately 400 kg or more.
The line has been used over and above its safe working load.
The line has been cut.
The line has become hard and brittle.

19
Q

Requirements of a knot

A
  1. Serve the purpose
  2. Be easy to tie
  3. Be easy to untie
  4. Not damage the line