9
5.3 Operation of the SRD:
Before each use, inspect the SRD, see Section 7 for inspection instructions.
5.3.1 Locking Mechanism:
The SRL utilizes an acceleration based locking mechanism. The locking function requires a certain
payout rate during a fall event to function correctly. Certain situations, confined or cramped spaces,
shifting footing such as sand, gravel, grain, or a sloped surface may not allow the lifeline to reach
sufficient speed to activate the lock mechanism. A clear path is required to assure positive locking of
the SRD. Ensure the lock is functioning properly. Pull the lifeline out a short distance and give it a sharp
tug. The lifeline must lock. If it fails to lock, remove it from service immediately. Ensure the work zone
remains within stated parameters.
DO NOT attach an additional energy absorbing lanyard or similar device between the SRD housing and
the anchorage.
5.3.2 Fall Arrest Impact Indicator:
The primary fall arrest impact indicator is the load-indicating leg-end connector. The connector will
display a red band if it has been subjected to fall arrest, or equal, forces, as shown in Figure 6, if the
snap hook shows any sign of damage, remove the unit from service.
Using Chart 1 to Calculate Minimum
Required Fall Clearance for the DuraTech
2 foot (0.6 m) increments along the Y-Axis represent
the Lateral Offset Distance the user is working away
from being directly under the SRD
5 foot (1.5 m) increments up the X-Axis represent the
SRD Anchorage Height above the user’s Dorsal D-Ring
Example:
If the user needs to work 10 feet (3.1 m) away from directly under the SRD, the SRD needs to be anchored at least
15 feet (4.6 m) above the user’s Dorsal D-Ring. Minimum required fall clearance is 8.5 feet (2.5 m) at maximum
allowable swing fall.
Example:
If the only suitable Anchorage for the SRD is at D-Ring height [0.0 feet (0.0 m)] above the user’s Dorsal D-Ring, the
maximum allowable work zone is 4 feet (1.3 m) away from the SRD. Minimum required fall clearance is 9.0 feet
(2.7 m) at maximum allowable swing fall.
Key to Work Zone Areas:
= Allowable Use Area = Not Allowed Use Area
WORKING IN THIS AREA MAY RESULT IN SERIOUS INJURY OR DEATH
DANGER!
DO NOT USE
IF RED
INDICATOR
APPEARS
SAFE TO
USE
REMOVE
FROM
SERVICE
Figure 6 - Inspecting SRL Load-Indicating Leg-End Connector
