Personal Protective Equipment; Description; Function - AWG S2 Original Operating Manual

AWG I Operating manual I Fittings I
2.4

Personal protective equipment

When using the AWG Foam nozzles, personal protective equipment
must be worn, in accordance with the country-specific fire service regu-
lation (e. g. in Germany: FwDV) or with internal company regulations,
in action.
3

DESCRIPTION

3.1

Function

With the AWG Foam nozzles S2/M2 and S4/M4 it is possible to pro-
duce medium expansion foam or low expansion foam as required in
accordance with DIN EN 16712-3. The water components of the foam
cool the fire surface. The foam blanket prevents oxygen access to the
burning material. Preventive foaming protects fire-endangered materi-
als against inflammation.
Adjustable foam nozzles consist of a nozzle head with a hand lever
and two concentrically arranged tubes. The interior tube is used to
produce low expansion foam, while the outer tube is used to produce
medium expansion foam. The foam agent/water mixture produced at a
constant admixing rate in the separate inductor is pressurised and
reaches the nozzle body.
If the device is switched to 'medium expansion foam', four outer swirl-
ers functioning as turbulence sources cause the foam agent/water mix-
ture with the aspirated air to rotate. The mixture flows through the noz-
zle bores, rips open and reaches the conversion screen evenly.
If the device is switched to 'low expansion foam', the foam agent/water
mixture reaches the inner tube through four smooth nozzle bores,
where it is swirled with the aspirated air by turbulence in the tube and a
jet-breaker screw. The flow does not pass through the conversion
screen.
The supply of the foam agent/water mixture is regulated by opening
and closing the ball valve.
The adjustable foam nozzles are equipped as standard with a pressure
gauge and a dirt trap sieve.
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Adjustable foam nozzles S2/M2, S4/M4
ENGLISH
DESCRIPTION
M1108B10 I Rev. 02-03/20