47
estimating the consumption of air necessary for the second participant in this
configuration, operation planning requires special attention.
6.5.2
Air supply from external source (models DIABLO INDUSTRIAL
MM, DIABLO ADVANCED, DIABLO INDUSTRIAL PI, DIABLO
INDUSTRIAL PIZ, only)
In this configuration, the apparatus is provided with an additional air connection
that allows the operator to draw in air from a system of cylinders of high capacity
or directly from a network supplied by one or more compressors. Figure 7 shows,
in the upper left, the connection fitting to a second external source of air. In the
lower right side of the image is shown the supply tube from the second source
equipped with quick coupling connection. The operator can connect to the
secondary source using a rapid connection, fixed on the belt, which prevents air
from escaping when the apparatus uses its own cylinder. The air drawn from the
external source must be breathable (according to EN 12021) and have the physical
requirements that make it usable E400 demand valve. In particular, it is requires
that the static pressure (at no flow) of the air supply is 6+0.5 bar, pressure
considered optimal for the functioning of the apparatus DIABLO. It is
recommended to use an external air source capable of supplying at least one
respiratory rate of 40X2.5 (cycles per minute X liters per cycle, i.e. l/min), and in
any case capable of delivering a flow rate of not less than 300 l/min, with a
pressure drop of not more than to 2 bar.
6.5.3
Drawing of air from the cylinder and from the air line
If you are operating with the SCBA being fed with air from an airline network,
while keeping the SCBA cylinder valve closed, when the air from the airline is no
longer available, to return to source air from the cylinder of the SCBA, it is
necessary to open the cylinder valve placed downwards on the back of the
wearer.
The connection to the airline network can also occur during the use of air from
the cylinder. In this case it is necessary to connect the second connector to the
second air supply by pushing the quick coupling energetic, to win the action of the
operating pressure inside the valve. Close immediately after the cylinder valve to
prevent its emptying while it is fed from the network.
6.5.4
Receiving air from an external source and feeding also a second
user (DIABLO ADVANCED and DIABLO INDUSTRIAL MM models
only)
This configuration offers the operator the possibility of feeding a second user and
have the safety of a second air supply from an external source. For the
characteristics and limitations of using this configuration refer to what was said in
both of the two previous paragraphs. The flow of air that the external source
makes available to the operator must be not less than 600 l/min in order to
ensure sufficient air to the operator and the possible second user.
EN
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