MSA 415865, User Instructions

Page: 6 / 60

6
Description
Rope Grab Subsystem
US
2 Description
The Rope Grab subsystem is designed as a means of fall arrest between a worker wearing a compatible
full-body harness and a suitable fall arrest anchorage. It is used to arrest the user in a fall from a working
height and suspend the user until rescue can be initiated. It consists of a Rope Grab assembly and a vertical
lifeline.
2.1 Specifications of Components
2.1.1 Shock Absorbing Lanyard
-
The minimum breaking strength of the 1.75 in (45 mm) wide polyester lanyard and shock absorber
webbing element is 5000 lbf (22.2 kN), when new.
-
Shock absorber limits fall arrest forces experienced by the user to under 900 lbf (4 kN) if the user is under
310 lbs (140 kg) in dry conditions. In accordance with ANSI Z359.15, the shock absorber limits average
fall arrest forces to under 1125 lbf (5 kN) if the user is under 310 lbs (140 kg) in hot, cold, or wet condi-
tions. The fall arrest distance is limited to 3.5 ft (1 m). For ANSI Z359.15 Rope Grab Assemblies only,
the fall arrest distance is limited to 4 ft (1.2 m) of energy absorber deployment.
-
The connector is zinc plated steel and 100% proof tested to 3600 lbf (16kN). Minimum breaking strength
when new is 5000 lbf (22.2 kN).
-
Rope grabs without an integral shock absorber must use an MSA shock absorbing lanyard approved to
the applicable agency standard ANSI Z359.13. Lanyard must not exceed 36 in (0.9 m) in accordance
with the current edition of OSHA.
2.1.2 Rope Grab Lifeline (Vertical Lifeline)
-
See rope grab label for full product specifications.
-
Rope part number found on vertical lifeline label.
Rope Part
Number
Material Diameter
Minimum Breaking
Strength
R512539 Polyester 0.63 in. (16 mm) 7825 lbf (34.8 kN)
R512544 Polysteel
®
core enveloped with polyester
fibers
0.63 in. (16 mm) 9450 lbf (42.0 kN)
SRP9200 Polysteel
®
core enveloped with polyester
fibers
0.63 in. (16 mm) 7530 lbf (33.5 kN)
SRP9300 Polypropylene 0.63 in. (16 mm) 11000 lbf (48.9 kN)
SRP7082 Polypropylene/Polyethylene 0.63 in. (16 mm) 6840 lbf (30.4 kN)
SRP120580 Polypropylene 0.63 in. (16 mm) 8910 lbf (39.6 kN)
WARNING
No more than one rope grab assembly must be attached to a rope grab vertical lifeline. No more than
one user must be attached to a single anchor lifeline. Misuse can result in serious injury or death.