MicroDrop
®-
EXTINGUISHING SYSTEMS

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2
SUCCESSFUL FIRE PROTECTION
STARTS WITH WATER
The industrialization of production
and trade has not only created the
need for structural fire protection
and assistance from fire brigades;
it also requires automatic fire pro-
tection systems on an increasing
scale. To meet this requirement for
improved protection of people and
equipment, sprinkler systems were
developed, starting in the middle
of the nineteenth century. These
systems optimized the extinguish-
ing effect of the water with mini-
mum water usage.
Water is still an important extin-
guishing agent today. It is reason-
ably priced, and almost always
available. Since it is compatible
with most other substances, it has
a wide range of possible applica-
tions.
MicroDrop
®: First class
extinguishing performance
Keeping pace with the advance
of technology, MicroDrop
®extin-
guishing systems are an innova-
tive and environmentally friend-
ly development based on TOTAL
WALTHER‘s water spray systems.
The very fine spray pattern makes
optimal use of the extinguishing
potential, while at the same time
limiting the consumption of conta-
minated extinguishing water.
Compatible with
composite water systems
MicroDrop
®extinguishing systems
from TOTAL WALTHER GmbH can
easily be connected to your exis-
ting sprinkler and deluge installati-
ons, thanks to system compatibility.
Our specialists use the same sys-
tem components which have prov-
en their excellence in these extin-
guishing techniques.
A long reach is achieved
with MicroDrop
® extinguish-
ing nozzles thanks to the
“transportation assistance”
from the inner cone of ex-
tinguishing agent.

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By installing special extinguishing
control cards, it is possible for the
extinguishing section valves to be
activated with different types of
timing:
x
discharge for limited periods
x
continuous discharge
x
intermittent discharge
Water supply
Commissioning of a MicroDrop
®
extinguishing system is conditional
on the water supply, either from
x
town mains or industrial water
networks,
x
pressure or gravity tanks,
x
pump systems in conjunction
with intermediate or storage
tanks,
x
pump systems supplied from
open bodies of water,
x
a connection from the water
supply for sprinkler and water
spray extinguishing systems.
Backed by more than 100 years
of experience, the team of specia-
lists at TOTAL WALTHER GmbH
will be glad to advise you on all
aspects of fire protection, including
unusual risks and equipment of all
sizes – so you can benefit from
their competence, commitment and
professionalism.
7
A CHOICE
OF CONTROL
1
2
3
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4
4
5
6
7
8
9
9
10
11
6
Diagram of a MicroDrop
®extin-
guishing system with two extin-
guishing sections
1
Closed sectional valve
2
Opened sectional valve
3
MicroDrop
®nozzles
4
Fire detector
5
Acoustic alarm
6
Alarm pressure switch
7
Manual activators for the
sectional valves
8
Detection and
extinguishing control panel
9
Solenoid valves to open and
close the sectional valves
10
Flashing light
11
Fire brigade hose
connection

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6
LEADING TECHNOLOGY
GUARANTEES FAST EXTINGUISHING
The structure and handling of a
MicroDrop
®extinguishing system
are based on TOTAL WALTHER‘s
expertise and experience in deve-
loping water spray technology. In
essence, their installation and ope-
ration are the same as for the
familiar, tried and tested water
spray extinguishing systems.
The central element of the system,
alongside the extinguishing nozz-
les, is the sectional valve. This valve
acts as an alarm and control valve
to activate the extinguishing pro-
cess, and is connected to the water
supply. The latest generation of
valves can be activated pneumati-
cally, hydraulically or electrically,
according to choice. To ensure
smooth operation, our specialists
base the fire detection and extin-
guishing technology on the same
type of operation. The MicroDrop
®
extinguishing system can also re-
leased manually.
When the extinguishing section
valve is opened, extinguishing wa-
ter flows to all the nozzles in a sec-
tion within a matter of seconds, fil-
ling the entire protected section
with water mist. The size and num-
ber of extinguishing sections and
nozzles installed will vary accor-
ding to the room and equipment.
Reliable activation
To avoid false alarms, cross-zoned
detection is used. When a prelimi-
nary alarm is given, only the main
valve is opened at first. But the
water is not released to the extin-
guishing nozzles in the protected
section until a second alarm is giv-
en.
DN50 control
valve for the
MicroDrop
®
extinguishing
system
MicroDrop
®extinguishing
nozzle and fire detector
in a cable duct.

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3
A SUPERIOR
EXTINGUISHING SYSTEM
Water brought to the
point of perfection
Unlike conventional sprinkler and
water spray extinguishing systems
which allow radiant heat to pene-
trate unimpeded, the MicroDrop
®
extinguishing system forms a water
fog made of very fine droplets.
These cool the flame zone, reduc-
ing the fire reaction and increasing
the heat absorption and preventing
the feedback of radiant heat.
2-stage extinguishing
with intermittent discharge
In extinguishing stage 1, flame
detectors detect the fire in millise-
conds, and initiate the immediate
discharge of extinguishing agent
on to the protected equipment. As
soon as the flames are suppressed,
the extinguishing system switches
off automatically. Extinguishing
stage 2 is only activated if the fire
has not been successfully extin-
guished. In this case, the entire
room is flooded with MicroDrop
®
water fog.
Protecting people
and the environment
MicroDrop
®extinguishing systems
quickly limit the fire while it is still
in its developing phase. The high
water solubility of smoke and fire
gases in a cloud of very fine drop-
lets reduces the harmful emissions
and the amount of any contamina-
ted extinguishing water. Even if ex-
tinguishing additives are used, the
MicroDrop
®water fog is not dan-
gerous to human beings. Thanks
to the advanced MicroDrop
®tech-
nology from TOTAL WALTHER
GmbH, it is possible to reduce the
water demand by 40 to 60%,
depending on the specific applica-
tion.
When extinguishing additives are
used such as foam, it is possible
to reduce the water demand by up
to 90% as compared with conven-
tional extinguishing methods – a
convincing contribution to environ-
mental protection.
MicroDrop
®
nozzles generate
a homogeneous
spray pattern.

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4
A SPECIAL APPLICATION
FOR FINE SPRAY NOZZLES
The MicroDrop
®technology from
TOTAL WALTHER is used in a pres-
sure range from 4 to12.5 bar, and
is classified as low pressure water
mist. Depending on the flow pres-
sure, patented fine spray nozzles
(swirl nozzles) generate water
droplets with a diameter of 20 to
200 µm.
Cluster nozzles
The cluster nozzle consists of a ra-
dial arrangement of 3 to 5 nozz-
les. In this way, large room areas
with up to 25m
2of protected area
can be effectively protected against
the hazards of fire.
Single and twin nozzles
TOTAL WALTHER GmbH offers ex-
tinguishing nozzles with one spray
cone (the single nozzle) and with
two spray cones with different
spray angles of opening (90°to
120°) - the twin nozzle. The water
mist can be optimized with a twin
nozzle.
Long range
The way the extinguishing nozzles
are installed in the room influences
the homogeneous distribution of
the water mist. With a horizontal
arrangement, the throw range is up
to 3m, while the vertical installation
arrangement enables reliable pro-
tection for distances of up to 7m.
Easy maintenance - inside and out
To keep the nozzles permanently
clean and ready for operation,
they are all equipped with a fine
filter to prevent contamination from
the inside, and a protective cap to
keep out external impurities.
Single and twin cone
nozzles made of
brass or special steel,
with various water
flow rates
MicroDrop
®
cluster nozzles
allow semi-coni-
cal room cover-
age for special
applications, so
that the number
of nozzles can be
reduced.

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5
FIRST CLASS FIRE PROTECTION
FOR EQUIPMENT AND ROOMS
MicroDrop
®in every
extinguishing situation
Modern MicroDrop
®extinguishing
systems from TOTAL WALTHER are
successfully used to protect machi-
nery, equipment and rooms of all
sorts against fire. Optimal position-
ing of the nozzles in the room or
on the machinery installation gua-
rantees comprehensive vaporiza-
tion at the seat of the fire – and
this in turn guarantees optimal uti-
lization of the available water.
One component in the system
MicroDrop
®extinguishing systems
are an optimal addition to your
overall fire protection concept.
They are the cost-effective alterna-
tive which can be used wherever
the fire may spread out from its ori-
gin in a short period, and where
wetting with water cannot cause
any damage. They are installed to
protect cable ducts and lines, trans-
formers and turbine areas, and for
local application protection in the
chipboard and foamed materials
industries.
Local application nozz-
les for use in small
room volumes and
special applications
Local applica-
tion protection
of a gas turbine
with two com-
bustion cham-
bers

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Please contact:
With its team of approximately 250
service employeesTOTALWALTHER
GmbH is on hand to look after your
safety and security right 24 hours
a day. You can reach us on our
Hotline day and night and at week-
ends for immediate service assist-
ance.
Fire extinguishing and security
systems have a name:
TOTAL WALTHER GmbH
AND OUR MAINTENANCE
AND SERVICE TECHNICIANS ARE
AT YOUR DISPOSAL ALL DAY, EVERY DAY
Kaltenkirchen
Hannover
Berlin
Dresden
Dortmund
Koln
Frankfurt
Karlsruhe
Stuttgart
Erlangen
Munchen
Branches all over Germany make
it easy for you: our specialists and
technicians are nearby ready to
help you personally on site.
TOTAL WALTHER GmbH
Feuerschutz und Sicherheit
Waltherstra?e 51
D-51069 Koln
Telephone:+49 (2 21) 67 85-0
Telefax:
+49 (2 21) 67 85-207
totalwalther@tycoint.com
www.totalwalther.com

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