Chapter 7 - Ropes and Knots Flashcards
Life safety rope
Designed to be used only for rescue and other emergency ops. Used to raise, lower or support FF during training. Should not be used for utility purposes.
NFPA 1983
Only rope of block creel construction using continuous filament virgin fibre for load bearing elements is suitable for life safety applications. Rope made of any other material or construction must not be used to support FF or victims.
- block creel construction: method of manufacturing rope without any knots or splices; a continuous strand of fibre runs the entire length of the ropes core
Maintaining accurate rope logs ensures that life safety ropes remain a reliable source of protection for rescuers and victims.
Remove life safety rope from service if subjected to impact load, fails inspection, has been used only as utility rope or is marked for destruction.
Utility rope
Can be used to hoist equipment, secure unstable objects, or cordon off an area. Downgraded life safety rope may be used as utility rope if in good condition still.
Synthetic fibres
Used to construct both life safety and utility rope. Synthetic rope will melt when exposed to heat.
Natural fibres
Only permitted for utility rope. Natural fibre rope loses its strength when it gets wet and rots rapidly. Prone to mold and mildew.
Kernmantle rope
Is a jacketed synthetic rope composed of a braided covering or sheath (mantle) over a core (kern) of the main load bearing strands.
- core is made of high strength fibres (usually nylon) which accounts for 75% of the total strength of the rope
- the sheath provides the rest and protects the core from abrasion and contamination
- used for life safety rope!
- Melting point: 204°c (400°F)
Dynamic rope
Used when long falls are a possibility. Designed to stretch without breaking.
Static rope
Used for most rope rescue ops. Designed for low stretch without breaking. Must not elongate more than 10% when tested under a load equal to 10% of its breaking strength. Used for rescue, rappelling and hoisting and when falls are not likely to occur or only very short falls.
Laid ropes
Constructed by twisting fibres together to form strands, then twisting the strands (usually 3) together to make the final rope. Used exclusively for utility ropes.
- 15% weaker when wet
- no heat rating
- Can absorb up to 50% of its weight in water
Braided rope
Constructed by uniformly intertwining strands of rope together in a diagonally overlapping patter. Most commonly used as utility rope.
Braid on braid rope
Consists of a braided core enclosed in a braided sheath. Half strength in its sheath and other half in its core. Does not resist abrasion as well as kernmantle rope. Used often for utility rope.
Inspecting rope
After each use and inspect unused rope at least once a year. Document in rope log.
- natural fibre ropes deteriorate with age
Maintaining rope
- Avoid abrasion and unnecessary wear
- Avoid sharp angles, bends and knots
- Protect ends from damage
- Avoid sustained loads
- Avoid rust
- Prevent contact with chemicals
- Reverse ends of the rope periodically
- Do not walk on rope
Cleaning rope
Use a stiff bristled brush to remove loose surface debris and grime.
Rope log
Includes; product label, identification label, and manufactures instructions, info regarding purchase date, use, maintenance and inspection, incidents that result in impact loading