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Questions and Answers
A bight is formed when a rope crosses over itself.
A bight is formed when a rope crosses over itself.
False
The standing part of a rope is the section that threads through to complete the knot.
The standing part of a rope is the section that threads through to complete the knot.
False
Safety knots are primarily used to increase the strength of the rope.
Safety knots are primarily used to increase the strength of the rope.
False
A bend connects the free end of two ropes together.
A bend connects the free end of two ropes together.
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All knots increase the strength of the rope.
All knots increase the strength of the rope.
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A loop is a turn of rope that does not cross itself.
A loop is a turn of rope that does not cross itself.
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To test the system, the stretcher should be lifted up to a vertical position and the patient should not drop during the process.
To test the system, the stretcher should be lifted up to a vertical position and the patient should not drop during the process.
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The Furley Stretcher Tie-In is a method used to connect a casualty securely to a Furley stretcher.
The Furley Stretcher Tie-In is a method used to connect a casualty securely to a Furley stretcher.
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High forces are rarely encountered during rope rescue operations.
High forces are rarely encountered during rope rescue operations.
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It is not necessary to assess the strength of an anchor when planning a rescue operation.
It is not necessary to assess the strength of an anchor when planning a rescue operation.
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To reduce leverage on a vertical anchor, it is recommended to secure the anchor attachment far from the ground.
To reduce leverage on a vertical anchor, it is recommended to secure the anchor attachment far from the ground.
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Building a bridle anchor from two anchor points is unnecessary when anchors are not in line with the rescue.
Building a bridle anchor from two anchor points is unnecessary when anchors are not in line with the rescue.
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If the distance between a highpoint COD and the ground is high enough to cause harm, then the rigging should be run at ground level.
If the distance between a highpoint COD and the ground is high enough to cause harm, then the rigging should be run at ground level.
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Most rescues can be accomplished with an 8:1 pulley system.
Most rescues can be accomplished with an 8:1 pulley system.
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A prusik will slip at around 300 kg (660 lbs).
A prusik will slip at around 300 kg (660 lbs).
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Rescuers need to calculate the force that will be exerted by the MAs before using a pulley system.
Rescuers need to calculate the force that will be exerted by the MAs before using a pulley system.
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Belaying is primarily used for rigging purposes in rescue operations.
Belaying is primarily used for rigging purposes in rescue operations.
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Using a COD is essential in situations where the main anchor point aligns perfectly with the load.
Using a COD is essential in situations where the main anchor point aligns perfectly with the load.
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In a compound pulley system with different MAs, it is recommended to attach the system with a higher MA to the load.
In a compound pulley system with different MAs, it is recommended to attach the system with a higher MA to the load.
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A Z-Rig MA is a 4:1 MA made with a single rope.
A Z-Rig MA is a 4:1 MA made with a single rope.
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Complex MA systems require more equipment compared to simple MA systems.
Complex MA systems require more equipment compared to simple MA systems.
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A change of direction (COD) within a MA occurs when the pulling force on the rope end is traveling in the same direction as the load travel.
A change of direction (COD) within a MA occurs when the pulling force on the rope end is traveling in the same direction as the load travel.
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A Z-Rig gets its name from the shape it forms when deconstructed.
A Z-Rig gets its name from the shape it forms when deconstructed.
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Ideally, separate anchors for each Mechanical Advantage (MA) should be less than a meter apart.
Ideally, separate anchors for each Mechanical Advantage (MA) should be less than a meter apart.
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Munter Belay techniques are suitable for high-structural or cliff rescues.
Munter Belay techniques are suitable for high-structural or cliff rescues.
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A safety belay system never comes under tension unless there has been a failure in the main line.
A safety belay system never comes under tension unless there has been a failure in the main line.
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A whistle test is used to ensure that the safety belay system can withstand catastrophic events.
A whistle test is used to ensure that the safety belay system can withstand catastrophic events.
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For mine rescue rope rigging, it is recommended to have only one independent rope system as a back-up.
For mine rescue rope rigging, it is recommended to have only one independent rope system as a back-up.
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Munter Belay techniques are quick to set up in situations where immediate first aid is needed.
Munter Belay techniques are quick to set up in situations where immediate first aid is needed.
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Safety Belay Systems are designed to fail in case of equipment failure or human error in the main line.
Safety Belay Systems are designed to fail in case of equipment failure or human error in the main line.
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Study Notes
Knots, Bends, and Hitches
- Rescuers must be able to tie knots, bends, and hitches in all conditions
- Key factors to consider when choosing a knot:
- Proven safety for intended use
- Sufficient strength for its role
- Easy to tie and untie
- Does not affect system strength beyond acceptable safety factor
Types of Knots
- Knot: a connection method used in rope or webbing to tie it to itself
- Bend: a tie that connects the ends of two ropes or webbing together
- Hitch: a tie that attaches a rope or webbing to another object
- Bight: an open turn formed when a rope is doubled back upon itself
- Standing part: the inactive section of rope during the process of tying a knot
- Running end: the end of rope that threads through to complete the knot
- Loop: a turn of rope that crosses itself
- Tail: the free end of rope that extends from a knot
Safety Knots and Stretcher Tie-In
- Safety knots are used to prevent fraying and to stop from sliding through a block, hole, or other knot
- Example of a stretcher tie-in: Furley Stretcher Tie-In, which securely lashes a casualty to a furley stretcher
Anchors
- Anchors must be solid and unmovable relative to the load being applied ("bombproof")
- Two or more anchors should be incorporated into the system whenever possible to minimize leverage
- Critical angle: when anchors are not in line with the rescue, a bridle anchor from two anchor points is necessary
- Anchor leverage: securing the anchor attachment close to the ground reduces leverage on a vertical anchor
Mechanical Advantage Systems
- Z-Rig: a 3:1 mechanical advantage system made with a single rope that can be easily changed to a higher MA
- Complex MA systems: combining two simple MA systems to accomplish a larger MA with less equipment
- Change of Direction (COD): where the pulling force on the rope end is traveling in the opposite direction of the load travel
- COD is needed in situations with limited space, misaligned haul lines, embankment-type rescues, and cliff rescues
Large Mechanical Advantage Systems
- 6:1 pulley system can accomplish most rescues
- 8:1 and 9:1 systems are not recommended due to rope and space requirements
- Safe working loads of rigging equipment must be considered in terms of force applied by these larger MAs
- Rescuer Pulling Force: the average rescuer can pull with a maximum force of 23 kg (55 lbs)
Belaying
- Belaying is used to protect a person or load from falling
- Munter Belay techniques can be used for a single person safety line on low-angle consolidated slope
- Safety belay systems:
- Catches the load of the main line if it fails without an operator to engage it
- Must be able to survive the event sufficiently undamaged and allow load to move up or down
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Description
Test your knowledge on resetting compound pulley systems with different mechanical advantages and using Z-Rig mechanical advantage systems in rope rescue scenarios. Learn about best practices for attaching and pulling loads with varying mechanical advantages.
