firedos applications and comparision to other mixing systems

7/28/2019 FireDos Applications and Comparision to Other Mixing Systems

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Fire-fighting with foam

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The FireDos ® mixing system forfluid fire-fighting media



Fire-fighting with foamThe FireDos ® mixing system for fluid fire-fighting media

Fire-fighting with foam : basic information

Overview of mixing devices

FireDos ® mixing system in different applications

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Basic components for fire-fighting with foam

The following components are required for theproduction of mechanically stable foam whichis suitable for fire-fighting :

1. Volumetric flow of water

2. Foaming agent concentrate

3. Mixer

1. Volumetric flow of water

2. Foaming agent concentrate

3. Mixer

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The mixer blends (1) and (2) to form :4. Foam premix

5. Foam generator

The foam generator mixes the foam premix

with air to form :6. Foam

(FireDos ® )

5. Foam generator

6. Foam

4. Foam premix



Principle of operation of the venturi suction mixer

Water jet pump principle :The main medium flowing hrough thepipe pulls in the dosing agent

1st Medium

2ndMedium

Gemisch

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Ideal flow-pattern through a pipea narrowed section :

The narrowed cross-section close to

the venturi causes an increase in thevelocity of the main medium

100 l/min 100 l/min

Narrowed section

Low velocityHigh velocity



Principle of operation of the venturi mixer

The sum of dynamic and static

pressure is constant (ignoring

frictional losses).

The dynamic pressure of the main

medium rises in the nozzle area of

SM

Water + SMWater

1 water entry

2 acceleration section3 narrow section4 water outlet

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cross-section

The static pressure falls

correspondingly and can drop below

1 bar (atmospheric pressure), which

causes the dosing agent to be drawnin

1 bar

1 bar

1 2 3 4

Static pressure

Dynamic pressure



Advantages

► comparatively low cost

► simple to operate

► no outside power source required

Pre-mixing on the suction side of the pumpVenturi suction mixing

1 Water tank

2 Venturi pipe

3 Suction inlet to fire-fighting pump4 Centrifugal pump

5 Pressure outlet

6 Foam agent tank

7 Dosin s stem Disadvanta es

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8 Suction line for foam agent► Only water or foam can be provided

at the outlets

► Water only from the tank; not from

other sources

► Corrosion of the water pump

► Resetting required if the pump

operating point changes

► Imprecise mixing rates

Foam agent

Water

1 2 3 4 5

8

6 7



Mixing at the pump ("around the pump" system)ATP System

1 Water tank

2 Suction inlet to fire-fighting pump

3 Centrifugal pump4 Pressure outlet

5 Foam agent tank

6 Foam agent suction line

7 Jet um mixer as the actual um re-mixer

Advantages

► comparatively low cost

► simple to operate

► no outside power source required

► widely used

Disadvantages

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Foam agent

Water

1 2 3 4

56

7

►Only water or foam can be providedat the outlets

► Water only from the tank, not from

other sources

► Corrosion of the water pump

► Manual resetting required if the

pump operating point is changed

► Imprecise mixing rates

► Mixing rates <1% no possible



Advantages

► Relatively precise mixing

► Variable mixing rates are possible

► No corrosion to water pump

► Water & foam can be discharged

simultaneously

Pressure-side mixing with foam pump & control valveMixing with control valve

Water Wasser + SM

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ow pressure oss

Disadvantages

► Outside power source required :

- electrical power supply

- additional drive to foam pump► Electronic components

► Cannot be operated manually

► High costs

► Limited flow rates, depending on drive

1 Pressure sensor & pressure gauge

2 Non-return valve, operates at 0.5 psi

3 Venturi element

4 Non-return valve5 Manually operated dosing valve for mixing rate

6 Electric foam agent pump with constant rev. speed

7 Foam agent tank

8 Dosing valve, powered by water pressure

Pump drive /

auxiliary drive



Pressure-side mixing with foam pump & outlet control Advantages


► Variable mixing rates at each outlet

► No corrosion to water pump► Water & foam can be discharged

simultaneously

► Low pressure loss

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Disadvantages

► Outside power source required :

- electrical power supply

- additional drive to foam pump

► Electronic components


► High costs

► Accuracy depends on control at mixing

point



Mixing with flow rate controlFoam agent A Foam agent

Processor

Pressure-side mixing with foam pump & electrical control circuit Advantages


► Variable mixing rates possible

► No corrosion to water pump► Water & foam can be discharged

simultaneously

► Low pressure loss

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Water + SMWater

1 Flow sensor2 Processor for fully automatic mixing

3 Display & control element4 Electric motor to foam agent pumpwith variable rev. speed

5 Foam agent tank6 Manually operated foam agent valve7 Foam agent pump with variable output

8 Non-return valve9 Non-return valve

10 Manual valve for "flush" line11 Flush line12 Non-return valve13 Selector lever to foam agent tank

Disadvantages

► Outside electrical power source required

► Electronic components


► High price

► Complex installation in vehicle

► Restricted flow rates



Pressure-side mixing, using the double-piston principle

1

2

6

4

7

Advantages

► No outside enery source required

► No corrosion of the water pump


simultaneously

► No electronics

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3

5

8

1. Double piston (water side) 5. Venturi mixing point

2. Double piston (foam side) 6. Waste water

3. Foam agent tank 7. Mix rate adjustment

4. Pressure outlet 8. Foam feedback

►Wide working range

Disadvantages

► High pressure loss

► Pressure at mixer min. 4 bar

► Suitable only for low mixing rates

► Not suitable for alcohol-resistant foam

agents

►

Fire-fighting water / waste water escapes



Advantages

► No outside power source required

► Even large water flows can be supplied

with foam agent

► Precise mixing

► Variable mixing rates, down to very low levels

► No corrosion of the water pump

Pressure-side mixing with the FireDos

®

mixing system

hydraulic drive (water motor)

range of types up to 10.000 l/min

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simultaneously

► Low pressure loss (as venturi)

► No electronics

► Less expensive than electronic DZ

► Simple to install

Disadvantages

► Heavier than electronic DZ & venturi

► More expensive than injector / venturi / ATP

1 Hydraulic drive2 Piston pump3 Pump head to piston pump4 Suction hose; foam agent canister

5 Flush line



1a Foam agent concentrate inan elastomeric membrane

1b Water

1c Membrane2a Venturi mixer2b Wide range proportioner

with pressure regulator3 Control valve

Principle of operation of the wide range proportioner with blower tank

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ut-o va ve

Proportioner withoutcontrols & blower tank



Principle of operation of the wide range proportioner with foam agent pump

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oam agent conta ner

2 Foam agent pump3 Shut-off valve4 Pressure regulator5 Wide range proportioner6 Water pump

7 Water tankr8 Flushing line



Principle of operation of the hydraulically operated proportional mixer

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1 Water tank2 Foam agent tank3 Proportional mixer4 Hydraulic motor5 Foam pump6 Water supply7 Alarm valves



Technical peripheral conditions for mixing systemsVenturi suction

mixerWRP1 with

blower tankWRP1 with foam

pumpProportional

mixer

Working range 1:2 to 1:4 1:10 to 1:40 1:10 to 1:40 1:8 to 1:40to 1:100**

Outside power independent independent dependent independent

Precision of mix limited good good good

Pressure loss up to ca. 3,5 bar up to ca. 1,6 bar up to ca. 1,6 bar up to ca. 1,9 bar

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Installation simple difficult difficult difficult

Mixing rate adjustmentafter installation

necessary necessary necessary not necessary

Flow smoothing necessary necessary necessary not necessary

First fill witl foam agent simple difficult simple simple

Below the workingrange….

higher mixingrate

higher mixingrate

higher mixingrate

lower mixingrate

Above the workingrange…

severe increase in pressure loss



•Venturi suctionmixer

WRP1 withblower tank

WRP1 with foampump

Proportionalmixer

Foam agent store Atmospherictank

Pressurevessel

Atmospherictank

Atmospherictank

Maintenance Low Low High Low

Can be refilled whilein operation

Yes No Yes No

Reading fill level Simple Difficult Simple Simple

Check mixer without Conditionall Not ossible Conditionall Possible

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generating premix***

possible

possible

Risk of functionalproblems

Low Defects with foamagent blowing

Moving parts;external energy

Moving parts

Changing foam agent Simple Difficult Simple Simple

Use of alcohol-resistant foam agents

Not possible Possible butadjustment required

Possible butadjustment required

Possible withoutadjustment

1 = WRP = Wide Range Proportioner* = Volumetric water flow, depending on model & maker** = where units are operated in parallel*** = under realistic operating conditions



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FD1000/0,3-3-APP-FIn a tender of the Munich fire service.

Vehicle made by : Iveco Magirus



FD12000/0,4-4-APP-F with oil-hydraulic torque transmissionIn a fire tender at Messrs. Infraserv GmbHVehicle made by : made in-house by Infraserv GmbH

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FD2500/3/3-PP-FIn a foam fire tender of the Port ofHong Kong fire serviceVehicle made by : Angloco, England

FD1000/0,6-6-APP-FIn a fire tender at Infraserv GmbHVehicle made by : Ginetti / Italy

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FD7500/3/3-PP-F

In a foam fire tender at Petrobras AraucadiaVehicle made by : Carbe, Brazil

FD4000/3/3-PP-FIn a foam fire tender Shell AustraliaVehicle made by : Wormald, Australia

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FD2500/3/3-PP-FIn a foam container at Rhein-pipelines VenloVehicle made by : Gemco

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FD20000/1-PP-SFire tendervehicle made by: Gemco

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picture 1:FD20000/1-PP-Sfire tender forseawater. Used by BP

and the tank farm adthe airport Schipholvehicle made by:Gemco

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pciture 2:FD20000/1-PP-Sfire tender forseawater. Used by BP


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picture 3:FD20000/1-PP-Sfire tender forseawater. Used by BP


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3 units FD20000/3-PP-Sinside an extinguishing system of anairport hangar at the Basel airport

3 units FD8000/3-PP-S

inside an extinguishing system of anairport hangar at the Basel airport

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FD4000/3/3-PP-FIn a foam fire tender at the refinery PancevoVehicle made by : Ziegler

FD4000/6(5)(4)/3(2)(1)-PP-FIn a foam fire tender at the company FreudenbergVehicle made by : Iveco Magirus

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Tank-based extinguishing systemDecal Tarragona / Spain2 x FD10000/3-PP-S seawater

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Tank-based extinguishing systemAgip Parma / ItaliaFD6000/3-PP-S

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Tank-based extinguishing systemTotal Mime / Argentina4 x FD6000/3-PP-S

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Tank-based extinguishing systemBP / Scotland

FD2500/3-PP-S seawater

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Tank-based extinguishing systemSassal / South AfricaFD4000/3-PP-S seawater



Tank-based extinguishing systemWarwickshire Oil Terminal / UK

FD6000/3-PP-S

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Offshore oil rig extinguishing system

Northern seaFD500/3-PP-S seawater



extinguishing system at chemical plantBASF Tarragona / SpainFD6000/3-PP-S seawater

extinguishing system at chemical plantICI Tarragona / Spain

FD6000/3-PP-S

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extinguishing system at refineryBP Cherry Point / USAFD8000/1-PP-S seawater

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firedos applications and comparision to other mixing systems

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