Rope Rescue CH 18: Hauling Systems
False
True or False? A 3:1 hauling system utilizes two main-line ropes and three locking carabiners.
True
True or False? A personal set of fours can be used in a variety of rescue situations, including confined space and water rescue.
False
True or False? The calculated mechanical advantage for rescue operation is typically actual mechanical advantage (AMA) because rescuers are not able to calculate all the possible friction loss.
Two whistle blasts
Utilizing the SUDOT whistle command system, how many whistle blasts indicate that rescuers should haul?
1983
What NFPA standard sets the rating of artificial high directional?
Tandem Prusiks
What can be used as a soft cam rope grab?
4000 lbs
With a 4:1 MA system, if a haul team exerts 1000 lbs of force what could be the resulting force on portions of the system?
25 lbs of force
With a 4:1 TMA system, how much force is necessary to raise a 100-lb load?
20 feet of rope
With a simple haul system with a 2:1 TMA, how much rope must be pulled to haul a load 10 feet?
The T system
________ is a method for calculating the TMA of a compound or complex pulley system, the tension in any one part of the system, and the force on each component.
haul cam
A ________ grasps the rope so that it can be pulled by the hauling system.
Piggyback system
A compound pulley system in which one hauling system pulls (or piggybacks) on another hauling system. The term is often used for a specific type of 4:1 hauling system in which one 2:1 system is attached to another 2:1 system to create a 4:1 system.
Portable anchor
A manufactured device with rigid arms, legs, or both designed to support human loads, and which can easily be oved from place to place.
Traveling pulley
A moving pulley that is attached to a load or to a haul cam, which adds to the mechanical advantage.
Fixed pulley
A pulley that is anchored and does not move as the load moves. Also known as a change of direction (COD) pulley. They do not add mechanical advantage to a system but may make it more convenient to pull.
Haul cam
A rope grabbing device that grips the rope to provide the "bite" in hauling.
Simple pulley systme
A simple machine consisting of a pulley and rope that provides a mechanical advantage.
Multipod
A type of artificial high directional that can be configured as a monopod, bipod, tripod, and quadripod.
Monopod
A type of artificial high directional that is a rigid pole with a pulley, usually on the top end. Also known as a gin pole.
Tripod
A type of artificial high directional that is a three-legged frame.
Bipod
A type of artificial high directional that is a two-legged structure and that has no inherent stability of its own.
High directional
An elevated change of direction anchor point used to change the direction of the main or working line. Types include natural, such as trees; structural, such as beams; and artificial, also know as portable anchors.
Compound pulley system
Any combination of two or more simple pulley systems rigged in such a way that the first acts on the second.
portable anchors.
Artificial high directional are also known as...
multiplying
As a general rule, when two rescue hauling systems are joined at the input of the first, the resulting TMA is obtained by ________ the two TMAs.
Z-rig
Common name given to a specific type of 3:1 hauling system. The name is taken from the general shape that the rope makes as it runs through the system.
40 feet
How much rope must be pulled to haul 10 feet of rope with a 4:1 TMA system?
100 lbs of force
In a direct pull haul system, how much force is necessary to raise a 100-lb load?
Simple pulley system
In what type of system do all moving pulleys move toward the anchors at the same rate as each other and the load?
as far forward on the hauling system as possible while still being safely in reach of the rescuers.
To offer the greatest protection, the progress capture device (PCD) should be positioned...
monopods.
Rigid poles with a pulley on the top end are known as...
Hauling systems
Rope systems generally constructed from life safety rope, pulleys, and other rope-rescue system components capable of lifting or moving a load across a given area.
the addition of one hauling rope.
The main difference between a 3:1 hauling system and a 4:1 hauling system is that the 4:1 system requires....
Mechanical advantage
The ratio of the output force produced by a machine to the applied input.
Haul system efficiency
The result of dividing the actual mechanical advantage (AMA) of a haul system by the theoretical mechanical advantage (TMA). This value is expressed as a percentage.
Actual Mechanical Advantage (AMA)
The useful mechanical advantage of a machine, such as a pulley system. It is calculated by subtracting the effects of friction form the theoretical mechanical advantage (TMA) of the system. It can also be measured by determining the actual input and output forces of the system in use.
Load : Force required to move load
Theoretical mechanical advantage can be calculated as the ratio...