Calculating Fall Clearance Distance - Honeywell Miller Duraflex Python Mode D'emploi

WARNING
Do not use a body belt for fall arrest.
5.1 Use of Attachment Ele-
ments (D-Rings) [See Table 3]
6.0 Calculating Fall Clear-
ance Distance
It is essential to understand how to calcu-
late the fall clearance distance required
for each work application to avoid contact
with a lower level.
The basic calculations shown in this section
and the related diagrams in Appendix A may
be used to determine Required Fall Clearance
when using a shock-absorbing lanyard or self-
retracting lifeline in an overhead application.
As many additional variables or factors can af-
fect fall clearance, it is imperative that the user
also refer to the instructions provided with the
connecting device for more comprehensive
information. For a more automated approach
to calculating Required Fall Clearance, access
the Miller Fall Clearance Calculator online:
www.millerfallprotection.com/fallclearance
Fall Clearance Calculation Guidelines:
• Full-body harness stretch is limited to 18
in. (457.2mm) or less. Full-body harness
stretch, the amount the full-body harness
component of a personal fall arrest system
will stretch and deform during a fall, can con-
tribute to the overall elongation of the system
in stopping a fall. It is important to include the
increase in fall distance created by full-body
harness stretch, as well as the full-body har-
ness connector length, the settling of the
user's body in the full-body harness, and all
other contributing factors when calculating
total clearance required for a particular fall
arrest system. Honeywell Safety Products
recommends and includes a 3 ft. (0.9m)
safety/stretch factor in its calculations.
• When a D-ring extension is used, add the
length of the extension to the fall clearance
calculation.
TABLE 3: Use of Attachment Elements on Body Belts
Attachment Elements
Rear - Waist
Hip - Side D-Rings
• Shock absorbers will elongate when sub-
jected to fall arrest forces. Refer to the labels
provided with the connecting device to de-
termine the maximum elongation distance,
and be sure to use the maximum elongation
distance to calculate required fall clearance.
NOTE: The shock-absorbing lanyard cal-
culation determines required fall clearance
from the connection point of the lanyard (to
the anchorage connector or anchorage) to
the next lower level or obstruction below the
work surface. The self-retracting lifeline cal-
culation determines required fall clearance
from the work level to the next lower level or
obstruction.
SHOCK-ABSORBING LANYARD
FALL CLEARANCE CALCULATION
(see Fig. 17a in Appendix A)
[Calculation taken from connection point of lan-
yard to anchorage connector or anchorage]
Length of Lanyard (LL)
+ Max. Elongation/Deceleration Distance (MED)
+ Height to Worker's Back D-Ring (H)
+ 3 ft. (0.9m) Safety/Stretch Factor (SF)
= Required Fall Clearance (RFC)
SELF-RETRACTING LIFELINE
FALL CLEARANCE CALCULATION
(see Fig. 17b in Appendix A)
[Calculation taken from work level]
Maximum Arrest Distance (MAD)
+ [Non-Standing Work Position Factor (NSF)]*
+ [Swing Fall Factor (SFF)]*
+ 3 ft. (0.9m) Safety/Stretch Factor (SF)
= Required Fall Clearance (RFC)
*
The self-retracting lifeline fall clearance cal-
culation assumes the user is standing and
performing work directly below the anchor
point; otherwise, additional fall clearance is
required. Refer to I267--Miller Self-Retracting
Lifelines User Instruction Manual for more
information regarding the non-standing work
position factor and the swing fall factor.
Questions?
Contact Honeywell Technical Service:
1-800-873-5242 (press 4)
Positioning
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Travel Restraint
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