Knots And Ropes Flashcards
Length of long lines
13m diameter
Kernmantle rope
15 meters long
They can withstand a safe working load of 500kg
Rescue lines
Are 13m in diameter
Kermantle rope
Consist of 50, 100, 200 meters.
Pocket line
6m diameter
3-4 meters long
Washing lines
Wash in cold water
Agitate the line in water
Do not use bleach or solvents
Rinse the line away from direct sunlight
Do not dry in dryer
Causes of deterioration
Mechanical
External
Internal
Overlooking
Local abrasion
Cuts contusions
Chemical
Chemical attack
Heat sunlight
Mildew
Standing part of the line that is fixed
Running end the free end of the line
Properties of synthetic fibre ropes
They absorb shock
They withstand repeated loads.
Little swelling in water
Can be stowed without degradation by rot or mildew.
Has a good weight to strength ratio.
What are the ropes used at fire and rescue made of
Polamide, kernmantle construction.
Look for
Signs of nicks,cuts contusions
Lack of uniformity
Discolouration
Exposed fibers
Signs of charring , heat damage.
Abrasion
Feel for
Stiffened fibers - heat damage
Changes in diameter - core damage
Soft spongy areas
Requirements of a knot
Serve the purpose
Be easy to tie
Be easy to untie
Not damage the line
The synthetic lines are made of polymamide kernmantle construction.
And covered by a woven mantle.
Lines should be replaced when.
It has been cut
Become hard or brittle
Shock loading
Or been used over its weight.
When should lines be inspected
Mondays and after use
What are some examples of chemical attack on lines
Acids
Batteries
Bleaches
What causes external wear of lines
Rough surfaces
Strands become worn outer faces flattened
And yarns broken
What causes internal wear of lines
Dragging
Internal movement between fibres causes grit to cut them and weaken line.
Indicated by excessive looseness of fibre. Strands
