CLUTCH Efficiency at the Head of a Mechanical Advantage System · • Fully read and understand the...
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CMC RESCUE ENGINEERING DOCUMENT Page 1 of 15 CLUTCH™ Efficiency at the Head of a Mechanical Advantage System Placing a CLUTCH™ at the head of a mechanical advantage system enables efficient hauling via the integrated rotating sheave (NFPA G-rated Pulley) while allowing immediate lowering of the load without system modification. __________________________________________________________________________________________ WARNINGS • Fully read and understand the CLUTCH™ technical manual before applying the following techniques. • Mastering these techniques requires training. • Consult a professional before attempting to perform these techniques on your own. __________________________________________________________________________________________ TEST METHOD A 100kg test mass was raised with several rigging configurations placing different devices at the head of the system: CMC Clutch™ CMC MPD™ Bobbin Style Descent Device (I’Ds) CMC HD4 Pulley CMC Proseries Carabiner The test rope was CMC G-11 Lifeline. For the 3:1 system, a CMC PMP Swivel Pulley was utilized. The force required to raise the test mass at a constant speed was recorded. Due to variables that are difficult to reproduce, the data is given for information only. Efficiency (EFF) is calculated by dividing the theoretical force required to raise the load by the measured force required.
Transcript of CLUTCH Efficiency at the Head of a Mechanical Advantage System · • Fully read and understand the...
CMC RESCUE ENGINEERING DOCUMENT
Page 1 of 15
CLUTCH™ Efficiency at the Head of a Mechanical Advantage System Placing a CLUTCH™ at the head of a mechanical advantage system enables efficient hauling via the integrated rotating sheave (NFPA G-rated Pulley) while allowing immediate lowering of the load without system modification. __________________________________________________________________________________________ WARNINGS
• Fully read and understand the CLUTCH™ technical manual before applying the following techniques.
• Mastering these techniques requires training.
• Consult a professional before attempting to perform these techniques on your own. __________________________________________________________________________________________
TEST METHOD A 100kg test mass was raised with several rigging configurations placing different devices at the head of the system: CMC Clutch™ CMC MPD™
Bobbin Style Descent Device (I’Ds) CMC HD4 Pulley
CMC Proseries Carabiner The test rope was CMC G-11 Lifeline. For the 3:1 system, a CMC PMP Swivel Pulley was utilized. The force required to raise the test mass at a constant speed was recorded. Due to variables that are difficult to reproduce, the data is given for information only. Efficiency (EFF) is calculated by dividing the theoretical force required to raise the load by the measured force required.
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SIMPLE DIRECTIONAL AT THE ANCHOR (1:1 THEORETICAL EFFICIENCY)
M= 100kg
F=140kg
EFF=71%
CLUTCH™
M= 100kg
F=114kg
EFF=88%
MPD™
M= 100kg
F=306kg
EFF=33%
Descender
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F=101kg
M= 100kg
HD4™
EFF=99%
M= 100kg
F=189kg
EFF=53%
Carabiner
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SIMPLE DIRECTIONAL AT THE LOAD (2:1 THEORETICAL EFFICIENCY)
M= 100kg
F=59kg
EFF=85%
CLUTCH™
M= 100kg
F=53kg
EFF=94%
MPD™
M= 100kg
F=81kg
EFF=62%
Descender
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F=50.4kg
M= 100kg
HD4™
EFF=99%
M= 100kg
F=66kg
EFF=76%
Carabiner
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SIMPLE HAUL SYSTEM (3:1 THEORETICAL EFFICIENCY)
F=39kg
EFF=85%
CLUTCH™
M= 100kg M=
100kg
F=37kg
EFF=90%
MPD™
M= 100kg
F=49kg
EFF=68%
Descender
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F=36kg
M= 100kg
HD4™
EFF=92%
M= 100kg
F=43kg
EFF=78%
Carabiner
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create illustration of the PMP Swivel pulley: https://www.cmcpro.com/equipment/pmp-swivel-pulley/
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CLUTCH™ Slip Testing Across Industry Ropes The CLUTCH™ is designed to provide safe rope slip in overload situations. To assess the point of slip across a wide variety of industry ropes, the device was anchored, and various ropes were pulled through the device at a rate of ~15cm/min. No visible damage was observed in any of the slip events __________________________________________________________________________________________ WARNINGS
• Fully read and understand the CLUTCH™ technical manual before applying the following techniques.
• Slip behavior changes with rope and device wear as well as environmental conditions and other factors.
• Mastering these techniques requires training.
• Consult a professional before attempting to perform these techniques on your own.
__________________________________________________________________________________________
TEST METHOD
Note: The data presented is for new ropes tested in a controlled laboratory environment. Due to various factors that are difficult to reproduce in each test, the results are provided for information only.
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10.9
7.3 7.5
11.2
8.3
11.6
8.7
10.39.7 9.1 9.4 9.2 9.0
13.1
0.0
2.0
4.0
6.0
8.0
10.0
12.0
14.0
Max
imu
m A
rres
t Fo
rce
[kN
]
CLUTCH Force Limit Slip Force
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CLUTCH™ Drop Testing Across Industry Ropes The CLUTCH™ is designed to arrest a fall and limit the dynamic impact load by safely slipping a limited amount of rope during an impact to dissipate energy. To inform users about the dynamic performance across a wide range of industry ropes, drop tests were performed with several ropes. In all cases, the CLUTCH™ safely arrested the fall without any visible damage to the ropes. __________________________________________________________________________________________ WARNINGS
• Fully read and understand the CLUTCH™ technical manual before applying the following techniques.
• Dynamic behavior changes with rope and device wear as well as environmental conditions and other factors.
• Mastering these techniques requires training.
• Consult a professional before attempting to perform these techniques on your own. __________________________________________________________________________________________
TEST METHOD A 200kg mass is dropped a distance of 1m on 3m of rope. The CLUTCH™ is mounted to an overhead anchor.
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For each drop, the maximum arrest force is captured by a high-speed load-cell. The distance of rope slipping through the device is recorded as well as the total system extension. Note: The data presented is for new ropes tested in a controlled laboratory environment. Due to various factors that are difficult to reproduce in each test, the results are provided for information only.
10.0
6.67.2
9.5
8.1
9.99.3 9.3 8.8
9.89.1 9.0
10.111.4
0.0
2.0
4.0
6.0
8.0
10.0
12.0
Max
imu
m A
rres
t Fo
rce
[kN
]
CLUTCH Drop TestingMaximum Arrest Force
1m Drop on 3m of Rope using 200kg
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180
990
650
410480
370
530
375
615
400 430 405 375305
35
680
350
200275
230180 180
240 220310 305
150 175
0
200
400
600
800
1000
1200
Dis
tan
ce [
mm
]
CLUTCH Drop TestingSystem Extension and Rope Slip
1m Drop on 3m of Rope using 200kg
System Extension Rope Slip
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CLUTCH™ Certifications, Uses and Applications The CLUTCH™ is a multi-purpose device that can be used as a self-braking belay device, descender, lowering device and a pulley. It can be attached to the user’s harness as well as an anchor and is certified to rope access, rope rescue, fire rescue and mountaineering standards. It also conforms to the requirements of Regulation (EU) 2016/425 on personal protective equipment (PPE) used for fall protection and rescue when used in accordance with certain standards detailed below. __________________________________________________________________________________________ WARNINGS
• Fully read and understand the CLUTCH™ technical manual before applying the following techniques.
• Slip behavior changes with rope and device wear as well as environmental conditions and other factors.
• Mastering these techniques requires training.
• Consult a professional before attempting to perform these techniques on your own.
__________________________________________________________________________________________
ROPE ACCESS DESCENDER / WORKING ON LINE
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ROPE RESCUE DEVICE
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MOUNTAINEERING / LEAD CLIMBER BELAY
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