Falltech DuraTech 9 User Instruction Manual page 24

310 lbs Maximum User Capacity
Figure 3B: Calculating Minimum Required Fall Clearance 9' Cable SRD
Free Fall Distance
A 2 ft
due to below D-ring Anchorage Condition
Deceleration Distance
B 3 ft Maximum allowable length of cable that may payout from the SRD once
deceleration of the user has begun and after a fall event occurs
Additional Deceleration Distance
3½ ft
C
due to below D-ring Anchorage Condition
Dorsal D-Ring Shift and FBH Stretch
D 1 ft
Combined amount of Dorsal D-ring up-shift and harness webbing elongation
during entire fall event
Safety Factor
1½ ft
E
Added length to account for other factors such as an improperly adjusted
harness, actual worker height or worker weight
Sub Total- Minimum Required Fall Clearance
11 ft
F
for non-overhead use of SRD with No Swing Fall (sum of A thru E only)
*Additional Fall Clearance Calculation
G*
due to Swing Fall (using Chart 1)
Total Required Fall Clearance
H
Including sub-total F and Swing Fall G (from Chart 1)
1. Overhead Anchorage 2. Walking/Working Surface 3. Nearest Lower Level or Obstruction
* If a potential Swing Fall Hazard condition is also present, additional Fall Clearance is needed in the above
calculation; see Chart 1 for calculating this additional required distance
Non-Overhead Anchorage
APPENDIX A
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