Tag Lines; Fall-Protection; Descent Energy Calculation - 3M DEUS 7300 Manuel D'instruction

Ascending with a DEUS 7300 device takes skill,
practice, and strength. Climbing aids – rope grabs,
ascenders and prusik loops – are not recommended
unless used by highly skilled people. If the person
climbing is not connected to the climbing aid, loses
control and lets go of the free side of the rope,
descent will begin immediately and the climbing aid
will likely travel up with the rope and jam the inlet of
the 7300 device.
Tag Lines. Descent from a high place presents risk of
the loaded and unloaded sides of the rope twisting
and tangling around each other, especially in windy
conditions. Also, the people descending have a risk
of spinning. Spinning can be disorienting and lead to
injury if the spinning causes contact with obstacles
and protrusions during descent. To mitigate these
problems, tag lines are strongly recommended.
Rigging, managing, and operating a tag line requires
special training and qualification.
Fall-Protection. Anyone doing rigging or acting
as a helper to another person who will use DEUS
equipment for descent may be working near an
edge and at risk of falling. Riggers and helpers must
use travel-restraint and/or fall-protection equipment
to prevent injury.
DEUS Model:
Date placed in service:
A. B.
Date Name
3M and DEUS Equipment Usage Log
DEUS Serial Number:
C. D.
Comment Load (kg)

Descent Energy Calculation

The brake pads in the DEUS 7300 are designed to
absorb 200 million joules of energy. Inspection
intervals are every 15 million joules. If someone
in your organization is responsible for equipment
inspection contact 3M for this training.
Calculation of descent energy is done as follows:
Multiply descent height (meters) times load
(kilograms) times number of descents times 10.
(The last "10" refers to the acceleration constant
of gravity. The actual acceleration constant of
gravity is 9.8 meters/sec/sec. The value of 10 is
used for simpler mental approximation. 9.8 can
be used in your usage log for greater accuracy.)
The unit of measure of the resulting calculation
is joules.
Example:
Assume an average weight per person of 220
lbs (100 kg), an average descent distance of 33 ft
(10 meters) and 1,500 descents of this load and
distance.
100 kg x 10 meters x 1,500 descents x 10 =
15,000,000 joules
It is the owner's responsibility to document and
maintain a usage log that shows the cumulative
descent energy absorbed by the DEUS 7300
controlled descent device. A sample log is provided
below, which includes the calculations for descent
energy, so you can track this.
E. F.
Descent Number of
distance descents
(meters)
G. H.
Descent Cumulative
energy total descent
(joules) energy (joules)
(DxExFx10)
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