Volume 3 Ropes And Knots Flashcards
One 300 foot low stretch 1/2 inch static kernmantle lifeline, white in color, with blue or red stripes running through it, stored in a red nylon bag is?
Main line
One 300 foot low stretch 1/2 inch static kernmantle rope, orange in color, stored in an orange nylon bag is?
Safety/ belay line
Size and length of accessory cord used to make LRH
8mm
20 ft in length
Size and length of long and short prusik
8mm, 6 ft (red)
8mm, 5 ft (green)
Length of blue 1” webbing
5ft
Length of yellow 1” webbing
12 ft
Length of red 1” webbing
20 ft
Length of yellow multi loop webbing
3 ft
The main line is connected to the _____ “D” ring. The belay / safety line is connected to the _____ “D” ring.
Waist
Chest
Carabiners used in the LAFD rope rescue kits are steel “D” shaped carabiners, rated at ____ pounds.
9,000 lbs
Rappelling or lowering operations over ___ feet a brake bar rack should be used, due to the twisting of the rope.
75 ft
The welded eye, on one end of the break bar rack is used for attachment and is rated at _____ pounds.
10,000 lbs
For a single person load (rappel or lower), start with ___ bars. For a two-person loads, start with ___bars.
4
5
The minimum bars should never be less that ___ bars while using the break bar rack in any operation.
3 bars
Pickets: Various patterns and configurations. Pickets should be ___ foot in length, ___ inch round steel stock preferred. The pickets should be pounded ___ feet into the ground, at a ___ degree angle, away from the object.
3 ft
1”
2 ft
15 degrees
Rating of picket systems
Single picket
1-1
1-1-1
2-1
3-2-1
Single: 700 lbs
1-1: 1400 lbs
1-1-1: 1800 lbs
2-1: 2000 lbs
3-2-1: 4000 lbs
1/2 inch KM-III static kernmantle rope is constructed of a tightly woven sheath (______), over a braided core (_______).
Mantle
Kern
The high strength core (Kern) can carry up to ___% of the load with the cover (Mantle) designed primarily for protection against abrasion
90%
1/2 KM-lll static Kern mantle rope is rated at ______ pounds and weighs ___ pounds per –100 feet, which meets or exceeds the NFPA 1995 standard for one and two - person rescues.
10,000 lbs
7 lbs
To determine the safe working load of a rope, you divide the manufacturers rated tensile strength by the NFPA safety factor of 15. E.g. 10,000 - pound rope divided by 15 = ____ pound working load, which exceeds the NFPA standard of 600 pounds for a two-person rope.
666 lbs working load
The webbing used by LAFD is 1 inch spiral weaved tubular and folded over flat webbing rated at ____ pounds.
4,000 lbs
Rating of prusiks used by lafd?
3,630 lbs
The LRH is designed for what 2 purposes?
- To act as a shock absorber when the main or belay is shock loaded
- To pass a knot through the system
Size of abrasion guards?
18”
To clean ropes, wash in cold water. Use a mild chemical free soap such as ________ , ________ or_________, in the wash cycle.
Lifeline cleaner
Ivory snow
Woolite
The KM-III static kernmantle rope has a melting point of ___ degrees Fahrenheit.
450 degrees
Approved markers for marking the lifeline ropes?
Carter MARKS- A LOT
Stanford SHARPIE
Binney- smith MAGIC MARKER
The equipment line is 150’ of ___ diameter rope with a factory eye splice on one end and a crown splice or whipping on the other end. It has a _____ lb. breaking strength and its working load is _____ lb.
5/8”
13,000 lbs
2,600 lbs
How to find the working load of a rope?
Take the breaking strength and divide that by the NFPA standard of 15.
Ex:
When tying your Munter hitch for the LRH, there should be ___ - ___ “ of space between carabiners.
4 - 5”
How many wraps are incorporated into the LRH.
3-6
The equipment line, double braid construction has an inner core of braided polyester which carries ___ % of the load. The outer jacket is a multiplex polyester fiber (Dacron) within which ___ of the strands are blue. It is designed for abrasion resistance and good grip, wet or dry, with or without gloves.
80%
25%
The 20 foot extension ladders use ___ inch line and the 35 foot extension ladders use ___ inch line
3/8”
5/8”
A dropline ( drop bag ) is 150’ of ___ “ Dacron braided line with a snap device attached to one end.
5/16”
A knot placed in a line decreases its working capacity.
Knot % of Loss.
Full strength, no knots ___ % loss
Eye Splice ___ % loss
Timber hitch; half hitch ___ % loss
Bowline; clove hitch ___ % loss
Square knot ___ % loss
Overhand knot ___ % loss
No knot- 0% loss
Eye splice- 10% loss
Timber hitch/ half hitch- 35% loss
Bowline/ clove hitch- 40% loss
Square knot- 50% loss
Overhand- 55% loss
For safety, completed knot should have a minimum ___” tail.
18”
