Retrofit of Fire Dampers2018-06-16T05:33:24+00:00

Retrofit of Fire Dampers with low pressure Extinguishing Technology

As an automatic shut-off, fire dampers prevent fire and smoke from spreading through the ventilation duct bilaterally connected to the flap. Fire dampers in existing buildings that were built before 1988 must be adapted to the current requirements. A low-cost renovation measure is often sufficient for this.

WATER EXTINGUISHING SYSTEMS

Water-based fire extinguishing systems
make up the largest share of the
extinguishing technology – in case of
sprinkler systems a simple and reliable
technology for decades.

GAS EXTINGUISHING SYSTEMS

The extinguishing effect of inert gases is
achieved by displacing the oxygen in the air.
Assets are protected by the slow response
that is typical of the inert gases CO2,
nitrogen and argon.

FIRE PROTECTION PRODUCTS

Basics as Fire Alarm Systems and
Gas Protection Systems or
innovations like cost-reduction
with automated system inspections
and the retrofit of Fire Dampers.

Renovation of Fire Dampers
as an inexpensive Alternative

If construction occurs, the building authority requires the modification of the building or its fixtures. This requires a connection between the old structure and the modification. Dependence between the old and new part of the building is sufficient. As a result, both the new parts of buildings and the old structure meet the current requirements.

In many cases it helps to renovate the fire dampers by installing a low-pressure extinguisher system. Major structural changes and high follow-up costs can be avoided, without compromising on safety.

Fire dampers are part of the ventilation systems in buildings. As an automatic shut-off, they prevent fire and smoke from spreading through the ventilation duct bilaterally connected to the flap. Fire dampers are installed into walls and ceilings for reasons of fire safety between sections of buildings to secure each fire area, and they are therefore generally within or directly connected to the associated fire wall. In normal operation, the fire damper is opened to allow air passage. But the ventilation duct stops and closes in case of fire.

The need for renovation may result from the following reasons:

  • Inadequate Fire Resistance

  • Insufficient Smoke Seal

  • The Presence of Components containing Asbestos

G&S Fire Protection – Construction and Assembling

Retrofit of Fire Dampers – the Concept

Low pressure extinguishing technology can be used as an alternative measure for fire dampers, which are currently used in the old building and do not meet the currently valid DIN regulations or the building regulations.

Such fine spray extinguishing systems are sprinkler systems that spray fire water drops with the low pressure of up to 10 bar at predetermined specifications in order to achieve a better extinguishing effect. Compared with conventional sprinkler technology they need a smaller pipe diameter and smaller component sizes which can be installed easily into existing ventilation shafts. They are efficient, cost-effective and at the same time ensure the appropriate fire resistance increase to the existing fire zone without increasing the necessary effort for structural fire protection measures.

Retrofit of Fire Dampers – the Funcionality

Im Lüftungskanal im Bereich der Brandschutzklappen werden Löschdüsen installiert, die im Brandfall in dem Kanal einen Wassernebel erzeugen. Der Wassernebel führt dabei zum einen eine Abkühlung des Kanals und zum anderen eine Absorption bzw. Auswaschung der Rauchgase herbei. So erfolgt eine Bindung und eine Niederschlagung der toxischen und korrosiven Brandzersetzungsprodukte.

Die Niederdrucklöschtechnik kann über die verschiedenen Wasserversorgungen betrieben werden. Dabei besteht die Möglichkeit, die Wasserversorgung über eine Sprinkleranlage oder über Wandhydranten zu gewährleisten.

Als weitere Option ist der Anschluss an eine ausreichend große Stadtwasserversorgung möglich. Über eine nachgeschaltete Druckpumpe wird der benötigte Anlagendruck zwischen 3 und 10 bar sichergestellt. Über ein Rohrsystem aus Edelstahl wird das Löschwasser bei Bedarf innerhalb weniger Sekunden an die Löschdüsen geführt.

Die Branderkennung erfolgt durch einen Lüftungskanal-Rauchmelder und einen Thermomelder. Die komplette Prüfung von zentraler Stelle ist über eine Testperipherie als zusätzliches Modul möglich.

ADVANTAGES OF A RENOVATED FIRE DAMPER

  • Fire Detection

  • Immediate cooling of the Ventilation Duct
    or the Fire Damper

  • Effective Washing and System Cooling

  • Considerable Reduction of the Spread of harmful Gases

  • Optional Testing Facility

Renovation possibilities for older type Fire Dampers

manufactured before 1974

  • Fire dampers are installed in type A (only with stop pin) or type B (only with stop angles) or type C (with rotating end brackets). The leakage with these flaps is relatively large, so that a sufficient smoke seal is often not in place. Sealing elements have only needed to be used since 1974 in order to meet the permissible leakage.

manufactured from 1974 to 1988

  • Following the introduction of the test mark obligation for fire dampers in 1974 because there were no suitable alternative materials, several fire damper components containing asbestos were used up to 1988.

made until the end of 1980

  • They contain asbestos building materials in flap leaves, frames, canopy panelling. Calcium silicate plates were used with the commercial name Marinite 36. They contained the asbestos chrysotile and amosite.
  • They contain materials using asbestos in gaskets in the stops, sometimes even in externally accessible covers of the installation area. Asbestos foam plastic with the trade name Litaflex KG25 was used. It includes asbestos chrysotile.

from end of 1980 up to 33rd calender week of 1988

  • This included the seals of the damper blade stops and possibly covers with the asbestos-containing material Litaflex KG25.
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INNOVATIONS

MASTERCONTROL

Substantial reduction of operating costs with automated sprinkler system inspections.

FIRE DAMPER RETROFIT

Renovate the fire dampers by installing a low-pressure extinguisher system.
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