A = Added Free Fall Distance Required Due To Non-Overhead Anchorage
B = SRD Deceleration Distance
C = Additional Deceleration Distance Due To Below D-Ring Attachment
D = D-Ring Shift And Harness Stretch
E = Safety Factor
F = Sub Total- Minimum Required Fall Clearance
G = Additional Fall Clearance Distance Due to Swing Fall
H = MRFC
The MRFC sub-total for a non-overhead anchorage below the D-ring is calculated as A+B+C+D+E = F.
The user must be aware that if a swing fall hazard exists, additional steps are required. Use Chart 1 to determine the amount of swing fall, and
place that value in G. Add the sub total of F to the value of G value get H. H is the MRFC for a non-overhead anchorage with a swing fall component.
See paragraphs 4.4. and 4.4.2.
4.3.3 MRFC For Overhead (Above the D-ring) Anchorage for 425 lb. User Capacity:
For those users approaching the upper reaches of the maximum combined weight of 425 lbs, the calculation process is the same as 310 lbs. See
paragraph 4.3.1. Those 425 lbs users will have a higher deceleration distance, as shown in Figure 4A.
4.3.4 MRFC Non-Overhead (Below the D-Ring) Anchorage for 425 lb. User Capacity:
For those users approaching the upper reaches of the maximum combined weight of 425 lbs, the calculation process is the same as 310 lbs. See
paragraph 4.3.2. The values of parts A, B, C, will have longer distances, and as a result, so will parts F, G, and H, as shown in Figure 4B.
4.4 Swing Fall:
A swing fall occurs when the worker moves laterally out from under the anchor and creates an expanded work zone condition. If a
fall event occurs, the worker would swing back toward the anchorage. The swinging action generates considerable force, and if the worker strikes
an obstruction or the lower level, this force could cause severe injury or death.
Swing falls may be one of two types; with an overhead anchorage, and with a non-overhead anchorage. Both types require additional fall
clearance.
4.4.1 Overhead Anchorage and Swing Fall:
For each foot of work zone expansion, the risk of severe injury or death from a swing fall increases. This
increased risk requires additional MRFC distance, as shown in Figure 5A
4.4.2 Non-Overhead Anchorage and Swing Fall:
A swing fall from a non-overhead anchorage, one that is lower than the user's FBH D-ring .
Combine an expanded work zone with a lower anchorage and the risk increases greatly, as shown in Figure 5B.
A swing fall from an expanded work zone, combined with the much lower height of a non-overhead anchorage, will significantly increase the risk
of severe injury or death. This condition requires an increased MRFC. See Chart 1 for instructions on how to determine a safe work zone.
WARNING
An expanded work zone combined with an SRD used in a non-overhead (below the D-ring) condition is extremely hazardous.
DO NOT
attach to an anchorage more than 5 feet below the level of the FBH D-ring.
4.5 Installation And Use Of The SRD:
Use compatible connectors when connecting to the anchorage and ensure unintended disengagement cannot
occur. Visually ensure all connectors close and lock securely. See Figure 13 in Appendix B.
The SRD is configurable into two orientation options, with the housing attached to the FBH, or with the housing end attached to an approved
anchorage. Inspect the SRD before each use in accordance with the procedures detailed in this manual. Before each use, ensure the SRD lifeline
locks by slowly extracting a length of lifeline, then pull sharply on the lifeline. The SRD must lock and the lifeline must stop paying out. See Section
7.
4.5.1 Single Housing End Attached To The FBH
: The SRD housing end is installed to the dorsal D-ring of an FBH and the leg end attached to a
suitable anchorage, as shown in
Figure 6A
. The anchorage may range from directly overhead, to as low as 5' below the dorsal D-ring. Refer back to
Figure 2A.
To attach the SRD on the harness, see Figure 6A. Follow these steps:
1.
Don the harness in accordance with the harness manufacturer’s instructions.
2.
Insert the nose end of an ANSI compatible double-locking carabiner through the SRD housing swivel eye.
3.
Attach the carabiner to the dorsal D-ring of the FBH. Ensure the carabiner gate is fully closed and locked.
4.
Connect the leg end connector to an approved, suitable anchor that meets work zone requirements.
The SRD will pay out and retract smoothly to maintain a taut line during normal movement. Work as directly under the anchor as possible. If
necessary, the leg end connector may be attached to a lower level anchorage, up to 2 ft. below the user’s harness D-ring. Be aware that a lower
anchorage increases the risk of injury due to swing fall. Additional fall clearance is required.
4.5.2 Single Housing End Attached To The Anchorage
: The housing end connector may be installed to a suitable anchorage, as shown in Figure 6B.
The anchor point may range from directly overhead to as low as 5' below the dorsal D-ring. Refer back to Figure 2B. The leg end is connected to the
dorsal D-ring of the FBH.
To attach the housing to an anchorage, see Figure 6B and follow these steps;
1.
Don the harness in accordance with the harness manufacturer’s instructions.
2.
Insert the nose end of an ANSI compatible double-locking carabiner through the SRD housing swivel eye.
3.
Attach the carabiner to the anchor point. Visually ensure the carabiner is fully closed and locked.
4.
Connect the leg end connector to the dorsal D-ring of the FBH. Visually ensure the connector is fully closed and locked.
The SRD will pay out and retract smoothly to maintain a taut line during normal movement. Work as directly under the anchor as possible. If
necessary, the leg end connector may be attached to a lower level anchorage, up to 5' below the user’s harness D-ring. Be aware that a lower
anchorage increases the risk of injury due to swing fall. Additional fall clearance is required.
DO NOT
attach the SRD leg end to the FBH with a rebar hook or any large-throat snap hook or large carabiner. A side load could cause an
unintentional disengagement. Use small snap hooks only.
DO NOT
attach the housing to the FBH with a rebar hook or any large-throat snap hook or large carabiner. A side load could cause unintentional
disengagement.
5
Summary of Contents for DuraTech Max Web Single
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