Ropes & Knots.pdf - Los Angeles County Firefighters Association

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LOS ANGELES COUNTY FIRE DEPARTMENT CONTEXT TRAINING PROGRAM ROPES AND KNOTS 2
3 LOS ANGELES COUNTY FIRE DEPARTMENT CONTEXT TRAINING PROGRAM ROPES AND KNOTS 1. General Information Ropes used by Los Angeles County Fire Department are of the Static Nylon Kernmantle design. This means that a braided sheath woven over an inner core with minimum low stretch. The inner bundles contribute most of the ropes tensile strength. They are continuous throughout the rope and run parallel, which not only reduces stretch, but also prevents spin. The load carrying core (kern) is protected from dirt, abrasion, and cutting by a tightly braided outer sheath (mantle). Rope shall be stored in the nylon rescue system packs and shall not be stored in compartments near fuel or battery storage areas. All rope and equipment shall be stored inside a compartment. 2. Life Line Rope With the breaking strength at 9000 pounds, 600 pounds is the maximum allowable load (working strength) that can be placed on a single line of 1/2-inch rope (15:1 safety margin). a. Construction: Static Kern mantle Material: 100% nylon (type 6.6) b. Elongation: Less than 2% at 200 lbs. c. Heat: Melts at 480 F. Becomes sticky at 445 F. Yellows at 300 F. d. Braid: One over, one under (braid on braid) for high abrasion resistance e. Core: Continuous block creel construction, parallel nylon fiber bundles, for low stretch and no spin. f. Identification: Continuous marker in core bundles gives place, year, and quarter of manufacture. g. Service Life: Cannot be determined in advance. It depends on a number of factors such as; Proper care, frequency of use, type of decenders used, speed of decent, rock or building abrasiveness, climate, and type of loading the rope is subject to. h. Lifeline rope use: After each use, whether training or rescue, an entry shall be made on the Form 247 assigned to the lifeline.
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Ropes & Knots.pdf - Los Angeles County Firefighters Association

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