Clearfall Distance; Tying Off - Falltech 30 Checkline Temporary HLL Manual De Instrucciones

3.3 – Clearfall Distance
As stated earlier, clearfall distance is the height at which the system must be rigged in order to avoid
striking the next lower level or an object/obstruction in the event of a fall. The minimum clearfall distances
for this system are shown below:
To calculate freefall for your specific application, use the formula below:
Freefall distance + Deceleration distance + Dynamic sag + Height of worker + Safety factor = Clearfall distance
- Freefall distance is measured by determining how far the user will fall before their lanyard or self-
retracting lifeline will engage to arrest the fall. If the user is tied off with a 6' shock absorbing lanyard,
and the HLL is mounted at the level of the back D-ring, the freefall will be 6 feet.
- Deceleration distance is the distance that the shock absorber will elongate, or that a self-retracting
lanyard will pay out in order to dissipate the forces. Consult the instruction manual for your lanyard,
SRL or other deceleration device to determine this distance.
- Dynamic sag is the deflection of the horizontal lifeline during the arrest of a fall. In the case of this
system, dynamic sag is equal to 10% of the actual span of the horizontal lifeline. These values are
shown below:
- Height of worker is the actual height of the workers utilizing the system. Be sure to utilize the height
of the tallest worker tied off to the system, or the height of the tallest worker who may be tied off to the
system while it is in service.
- Safety factor is generally always 2 feet, and is an additive to ensure that there is some clearance
between a workers feet and the next lower level after a fall has been arrested. The safety factor can
be increased, but should never be decreased.
For more detailed information on clearfall distances, consult the charts in appendix A.
3.4 – Tying Off
Once the system has been installed and the clearfall distances have been evaluated and planned for,
the system is ready to use. Before tying off, be sure to check the area below to ensure that it is free from
obstruction. Also be sure to check the working area for any fall hazards or tripping hazards that may exist.
Be alert and pay attention to your surroundings. Ensure that you have conducted an inspection of the HLL
system.
The Checkline Temporary HLL system is a continuous length anchorage connector. It is one part of a
complete fall arrest system. Ensure that the other components of this system (Full body harness,
30' Span 50' Span
21 feet 23 feet
30' Span 50' Span
3 feet 5 feet
75' Span 100' Span
25 feet 28 feet
75' Span 100' Span
7.5 feet 10 feet