Transformer fires under control with the One Seven® compressed air foam system

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Source: DPA Fire inside the transformer station of the nuclear power plant Kruemmel / Schleswig-Holstein on June 26th, 2007

Especially transformer fires are extremly compli-

cated to extinguish. In the majority of cases, the

transformers cannot be accessed from the outside

and the burning transformer oil bears a high safety

risk for the firefighters.

A precise firefighting requires on the one hand

an efficient extinguishing agent and on the other

hand an at least pre-assembled possibility for foam

injection.

With the innovative One Seven® system Gimaex has

a highly efficient and safe extinguishing system

which is approved for electrically plants.

Moreover, the know-how for stationary or half-stati-

onary compressed air foam applications is provided.

This is the solution for a successful and fast firefigh-

ting of such complicated fires and therefore it avoids

long downtimes.

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One Seven® - Dry Foam

Test procedure according to European standard

EN 3-2/1999

The following values have been determined:

35 kV/50 Hz 99,6 µA at Dry Foam

35 kV/50 Hz 1247,0 µA at Wet Foam

The application of a One Seven® 1.5" (C) nozzle

with One Seven® Dry and Wet Foam in electrically

plants of up to 35 kV had been tested and certified

by the accredited laboratory "VEIKI-VNL Villamos

Nagylaboratóriumok Kft. Tanúsitási iroda".

When applying One Seven® at electrically

plants with a voltage of up to 35 kV, a minimum

distance of 4 m must be kept.

One Seven® Wet Foam

A foam spaying nozzle system has to be installed for the application in transformers stations to provide a gapless covering with One Seven® Wet Foam for efficient and sustaining extinguishing of the burning transformers oil in shortest time.

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Protection target:

The transformer stations are located inside the

production building at different floors. Due to the

appropriate design of the extinguishing sectors it is

possible to effectively protect all substations from

the control station.

One Seven® flat jet nozzles will be used as discharge

installations for optimum compressed air foam

covering.

One Seven® compressed air foam system type: "OS 3100 ST" for protecting seven substations

Nozzle arrangement for protecting a transformerExtinguishing sector distribution bar in the control station

Foam generator inside the basement of the Sanovel production plant

Reference object: Sanovel Pharamzie Istanbul, Turkey

No firefighter must enter the room for efficient

firefighting!

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Train station "Potsdamer Platz"

Protection target:

In the case of a fire, the cable tunnels (2.0 m wide -

3.0 m high) in the basement of the train station will

be foamed by a stationary One Seven® OS 5000 ST

compressed air foam system so that a fire will be

completely extinguished within a short time.

The cable tunnel to be protected has a length of

approximately 200 m. The foam pipeline networks

and the nozzle distribution networks have been

separated into four extinguishing sectors.

128 One Seven® flat jet nozzles have been installed

to cover the complete cable tunnel.

Customer: Deutsche Bahn Group

Train station "Potsdamer Platz" in Berlin

The One Seven® extinguishing system "OS 5000

ST" had been inspected and certified by the

Technical Inspection Authority (TÜV) Berlin-

Brandenburg.

One Seven® compressed air foam system type:

"OS 5000 ST" for protecting a cable tunnel

Reference object: Deutsche Bahn Group, train station "Potsdamer Platz"

Detailed view: Cable tunnel with nozzle network

Diagram of the nozzle

arrangement in the

cable tunnel with

illustration of the

spraying areas.

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Extinguishing test: Refinery REPSOL Tarragona, Spain

Fire area tub with a diameter of 10 m

Fuel diesel

Extinguishing equipment One Seven® OS 1200 T

Proportioning rate 0.5 % class B (AFFF)

Foam consistency Wet Foam

Extinguishing time 1 : 30 min

Water consumption 370 litres

Fire area high tank with a diameter of 6 m

Fuel diesel

Extinguishing equipment One Seven® OS 1200 T

Proportioning rate 0.5 % class B (AFFF)

Foam consistency Wet Foam

Extinguishing time 1 : 54 min

Water consumption 323 litres

Extinguishing test: Naval college in Oviedo, Spain

Starting the firefighting after a pre-burn time of 2 minutes Fire extinguished after 1:30 minutes

Starting the firefighting after a pre-burn time of 2 minutes Fire extinguished after 1:54 minutes

Gimaex-Schmitz Fire and Rescue GmbH

a Gimaex International Company

Essener Straße 8

57234 Wilnsdorf, Germany

Tel. +49 (0) 27 39 - 8 09 - 0

Fax +49 (0) 27 39 - 8 09 - 99

eMail info@gimaex.com

www.gimaex.com

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This foam concentrate is allowed for the firefighting

of class B fires like flammable liquids (hydrocarbons)

or plastic fires.

It is currently the only foam concentrate worldwide

which requires a proportioning rate of only 0.5%.

The foam concentrate can also be used with

seawater.

It features an excellent environment compatibility.

Ideal extinguishing effects will be reached with a

proportioning rate of only 0.5%.

When comparing prices, please note that you have

to provide the 6- to 10-fold quantity of conventional

multi purpose foam concentrate. For comparable

extinguishing results you would also have to carry

along the 6- to 10-fold quantity in the vehicle.

The advantages of the class B-AFFF foam

concentrate at a glance:

The foam concentrate is non-toxic and easily

biodegradable (up to 96% within 17 days).

· very good environment compatibility

· economical due to low proportioning rates

· low proportioning rates, normally 0.5%

· fast penetration into the fuel

· Government approved under SP 35/01

The concentrate‘s characteristics:

Appearance: clear, yellowish liquid

Density at 20° C 1.05

PH value at 20° C 8.5

viscosity, mPa.s at 20° C 20

freezing point <-15° C

Efficiency of the foam solution:

A 0.5% solution features the following typical

characteristics:

Surface tension at 20°C, mN/m 15.5

Interfacial tension with

N-heptane at 20°C, mN/m 2.5

Foam expansion index 7.5

One Seven® foam concentrate class B (AFFF)

BiLaCon diagram

One Seven® foam concentrate

Extinguishing test at a plastic fire

Extinguishing test: diesel fire

Extinguishing text: Flammable liquids, RISC Rotterdam