Ropes, harnesses and hardware must comply with NFPA 1983. Rope Use ClassificationsPrimary Uses Life Safety Rope Breaking Strength 1200 kg means safe working strength of 240 kg Safety factor of 5 – allows “room” for knots, bends, etc…. Safe Working Strength – 1/5 of Breaking strength (as determined by manufacturer). Rope Use ClassificationsPrimary Uses Utility Rope Uses Just to prove it does get done… sometimes Sheath provides some strength but protects kern from abrasion. Load characteristics dependant on manufacturing method. Main load bearing strands in core (kern). Doesn’t resist abrasion as well as kern mantle. Strength divided equally between core/sheath. Load bearing fibers are exposed to direct abrasion and damage. Made by uniformly intertwining strands together. Susceptible to abrasion and physical damage. How tightly twisted and type of fiber dictate ropes properties. Generally three strands are twisted together to make rope. Constructed by twisting yarns together to form stands. Rope Construction Methods and Their Characteristics Resist mildew/rot Increased strength Flexibility Resists abrasions Lighter Higher melting point Non-conductive Many float General Advantages of Synthetic Ropeĭynamic: Designed for high stretch without breaking Used in rock climbing where falls are possible Static: Designed with low stretch Rope of choice for most rescue incidents, rappelling and hauling/hoisting equipment Rope Categories There are various other proprietary materials too Refer to Table 6.1 page 149 IFSTA Manual. Rope Materials & Their Characteristics Common Synthetic materials: 
Manila Rope Made from the fibers that grow in the leafstalk of the abaca plant.
Hemp Refer to Table 6.1 page 149 IFSTA Manual. Rope Materials & Their Characteristics Natural materials: Describe methods of rigging basic equipment to be hoisted. 
Identify basic knots used in the fire service. Proper methods of inspection, maintenance, and storage of ropes. Identify the different materials that fire service rope is constructed from.
0 kommentar(er)
