Plan The Personal Fall Arrest System; Anchorage Structure; Acceptable Anchorage Range, Diameter Of Anchorage Structure, And Free Fall; Calculate The Mrfc - Falltech WrapTech Manual De Instrucciones Para El Usuario

4. INSTALLATION AND USE

4.1 Plan the Personal Fall Arrest System:

Do not alter or intentionally misuse this equipment. Consult FallTech when using this equipment in combination with components or
Do not connect rebar hooks, large carabiners, or large snap hooks to the FBH dorsal D-rings as this may cause a roll-out condition and/or
Avoid electric hazards. Use caution when performing arc welding. Arc flash from arc welding operations, including accidental arcs from
Examine the work area. Be aware of the surroundings and workplace hazards that may impact safety, security, and the functioning of fall arrest
systems and components. Hazards may include but not be limited to cable or debris tripping hazards, equipment failures, personnel mistakes,
moving equipment such as carts, barrows, fork lifts, cranes, or dollies. Do not allow materials, tools or equipment in transit to contact any part
of the fall arrest system. Pay special attention to the lifeline. Do not work under suspended loads.
Examine the work area and take action to address hazards. See paragraph 2.5. Falls are a serious hazard when working at height. All anchoring
situations present different clearance issues, performance characteristics, and requirements.
Table 4 provides typical performance attributes of a FallTech WrapTech 7'/9' Mini Single/Twin SRD, for workers up to a maximum total weight of
310 lbs. The qualified person may find this data useful in determining anchor location. There are several closely related facets of fall hazard
management with a PFAS;

Anchorage Structure

•
Acceptable Anchorage Range and Free Fall
•
Minimum Required Fall Clearance
•

Swing Fall

•
•

Installation and Use of the SRD

4.1.1 Anchorage Structure: An anchorage structure is any part of a building or structure on the building that will meet strength requirements.
NOTE: OSHA 1926.502 and 1910.66 require that anchors for a PFAS be able to hold at least 5,000 pounds of weight per person or maintain a safety
factor of at least two (twice the impact load) under the supervision of a qualified person.
Method of attachment to an anchorage structure may be either wrapped back or with the carabiner directly attached.
4.1.2 Acceptable Anchorage Range, Diameter of Anchorage Structure, and Free Fall: Figure 2B, 2C, 2D, and 2E depict a tie-back anchorage, with a
maximum diameter of 11.5" and a minimum diameter of 3". The acceptable anchorage range is the total vertical range of allowable anchor
placement, relative to the height of the users FBH D-ring, ranging from 5' above the D-ring, to a maximum of 5' below the D-ring, dependent on the
tie-back anchorage structure diameter.
Free fall is the vertical distance the user will travel before the system begins to engage if a fall event occurs. Free fall distance will vary depending
on the diameter of the anchorage, and the vertical distance from the anchorage to the FBH dorsal D-ring. Figure 2B illustrates free fall
requirements for an anchorage diameter of 11.5", at various heights. At the highest anchorage, 5' above the FBH D-ring, there is 0' free fall
requirement. As the anchorage level drops to level with the D-ring, shown as 0', the free fall required increases to 1.5', and at 5' below the D-ring,
the free fall requirement has increased to 6.5'. Figure 2C shows the same information for a 9" diameter anchorage structure, Figure 2D is for a 6"
diameter, and Figure 2E is for a 3" diameter anchorage structure.
Figure 2F depicts a direct connection of the leg end connector to an anchorage structure. As shown, the acceptable anchorage range is from 5'
above the D-ring, to a maximum of 2' below the D-ring, and results in a free fall requirement of 6.5'. The maximum allowable free fall for the SRD
discussed in this manual is 6.5'. This free fall must be carefully considered when calculating the MRFC.
4.1.3 Calculate the MRFC: To calculate the MRFC use Figure 3 as a worksheet. As shown, there are six metrics; A, B, C, D, E, and F. G is the sum of
these values, and G is the MRFC.
Metric A is the amount of additional fall clearance due to potential free fall. Metrics B, C, and D are known equipment parameters, with their values
filled in. Metric E is the sub-total of B+C+D. Metric F is additional fall clearance calculation due to Swing Fall. If a swing fall hazard exists, see Chart 1
to derive how much additional fall clearance due to swing fall is required. Place that value in the box for metric F.
If there is no swing fall hazard, disregard metric F, and use only A – E. Metric G is the MRFC.
Anchor points located low in the acceptable anchorage range will require additional clear fall distance. Always consider where the anchor point
is located and ensure there is adequate clear fall distance to avoid striking an obstruction or a lower level.
4.1.4 Swing Fall: Swing falls occur when the user is not directly under the anchor point as shown in Figure 4A.The force of striking an obstruction or
a lower level in a swing fall may result in serious injury or death. This force will increase as the user moves horizontally away from directly under
the anchor.
Swing falls may also occur when the user is tied off below the FBH D-ring as shown in Figure 4B. Minimize swing fall by working as close to the
anchor point as possible.
If you must work away from the anchor, ensure there is adequate fall clearance. Use Chart 1 to find the additional fall clearance required due to swing fall.
4.2 Installation And Use Of The SRD: The SRD is always used with the housing end attached to the FBH. The SRD may be installed and used as a
single unit, or as a twin. Installation and use of the SRD discussed in this manual must be on a properly adjusted and fitted FBH. Improper
adjustment and fit of an FBH is dangerous and may result in serious injury or death.
4.2.1 Single SRD: A single SRD is attached to the dorsal D-ring of the user's FBH with an standard approved carabiner and attached to the
anchorage is one of two manners. See Figure 5. 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 is oriented with the lock opening up and will take the load
along its major axis. Visually ensure the carabiner closes and locks securely.
MSRD13 Rev B
subsystems other than those described in this manual.
unintentional disengagement.
Use caution. Take action to avoid sharp and/or abrasive surfaces and edges.
electrical equipment, can damage equipment and are potentially fatal.
WARNING
WARNING
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