TR Ropes Basics
Webbing used to support humans has a min. of?
1 3/4 inch width & a breaking strength of 600lbf
The sheave or wheel of the pulley should have a diameter of?
should have a diameter of 4 times the diameter of the rope being used. 12.5 mm X 4 = 50mm (1/2" X 4 = 2". 5/8" rope would require 4" pulleys).
Define Impact Load
sudden application of a force, which causes kinetic energy and momentum to be converted into other forms of energy.
Define Proof Load
the application of force to a material as a nondestructive test to verify the performance of that material.
What is the rescue knot used for?
used for raising or lowering individuals and should be constructed using lifeline rated rope.
Emphasize the importance of...
verifying whether or not the device is designed for use in a mechanical advantage system and identify the limitations of its use.
How many types of bearings are there?
2. Bronze bushings and ball bearings
Prussik sling should be what diameter of mainline?
2/3 to 3/4 diameter of main line
Define Rope
A compact but flexible, torsionally balanced, continuous structure of fibers produced from strands that are twisted, plaited, or braided together and that serve primarily to support a load or transmit a force from the point of origin to the point of application.
Figure 8 plate descent distance
Descent distance should be limited to 75' to 100' when using a figure of 8 plate.
What are pulleys used for?
Pulleys are used to reduce rope friction, to reposition a rope to a safe area, and change the direction of a running rope.
Define Moderate Elongation Laid Life Saving Rope
Rope dedicated solely for the purpose of supporting people during rescue at firefighting operations or training evolutions.
What are the rescue ropes and there strengths?
TECHNICAL USE LIFELINE - diameter is 3/8" (9.5 mm) up to 1/2" (12.5 mm) with a minimum breaking strength of 4496 pounds and a maximum safe working load of 300 pounds. GENERAL USE LIFELINE - diameter is 7/16" (11 mm) - not more than 5/8" (16 mm) with a minimum breaking strength of 8892 pounds and a maximum safe working load of 600 pounds. ESCAPE ROPE - diameter is 1-9/64" (7.5 mm) - less than 3/8" (9.5 mm) with a minimum breaking strength of 3034 pounds and a maximum safe working load of 300 pounds (intended only for emergency self-rescue situations). THROW LINE - diameter criteria is the same as escape rope with a minimum breaking strength of 3000 pounds.
Define Fire Escape Rope
an emergency self-rescue rope used to escape an immediately hazardous environment involving fire or fire products; not classified as a life safety rope.
What is a rope grab device?
auxiliary equipment used to Grasp a life safety rope to support a load. It can be used as an ascension device.
Ascenders should not...
be used as a load capturing device.
What is a class II harness?
designed for rescue operations, design load is 600 lbf. A "Swiss seat" is an improvised Class II harness. Goes only around waist and hips.
What is a class III harness?
designed for rescue operations. The design load is 600 lbf. Goes around waist,hips, and shoulders.