Jet Brochure

WITT&SOHN

VentilationVentilationTunnelTunnelTunnelTunnelVentilationVentilation

WITT&SOHNVentilatorenVentilatorenIGW

Established over 60 years ago, the Witt Group

has expanded into one of the world‘s premier manufacturers of industrial fans. With manufacturing facilities in Germany, the UK and Switzerland, and licensed manufacturing in Canada, Japan, Korea and Indonesia, inaddition to a network of agents, the Group isable to supply products throughout the world.

Over the past 25 years, the Witt Group has added Tunnel Ventilation Systems toits range of centrifugal and axial-flow fans. Alongside a range of jet fans, the Group has researched and developed a number of systems that can be used for ventilating tunnels.

Witt Group HQ, Hamburg, Germany

Witt Group ProfileWitt Group Profile

Precise, quality engineering has enabled the Witt Group to establish itself as one of the market leaders in tunnel ventilation systems. The Group is able to conduct the whole process from system design to installation,commissioning and also service & maintenance.

With a reference list of over 200 projects, including many significant contracts such as the new Kowloon KCRC rail link in Hong Kong, the Bangkok Metro in Thailand, the FjellinjenTunnel in Norway, the Chengdu-ChonqingTunnel in China and the new Elbtunnel in Germany, WITT&SOHN AG can call on muchexperience and technical knowledge to design world-class systems.

•Tunnel Jet Fan•Axial – Flow Fan•Banana Jet ® Fan

Working to DIN EN ISO 9001 quality systems, we can ensure that the product quoted is thesame as the product supplied, with regards toperformance, noise and other characteristics.

Pictured are a number ofproducts used for tunnel ventilation systems:

WITT&SOHN AG is renowned for their range of axial-flow fans, which are installed in tunnels world-wide. The range of fans is shown below:

Axial – Flow Fans are commonly used in shafts for tunnel ventilation or forexhausting fumes / smoke from the tunnel.

Shown above are the axial-flow fansdestined for use on a new metro project. On the left is shown thelowering of an axial fan into a shaft to extract fumes / smoke in the event of a fire.

~7,100119695007452,8001500800,000

~6,200116663557402,8001000800,000

~4,100117672509952,2401500400,000

~3,700115651609902,2401000400,000

~2,400113641109901,8001500200,000

~2,10011060759801,8001000200,000

~1,20011263551,4801,2501500100,000

~90010961371,470 1,2501000100,000

Total Mass kg

Sound Power dB(A)

Sound Pressure dB(A) 1m (ISO-D)

Motor Power kW

Speed

Min -1

Fan Size mm

Total Pressure Pa

Vol Flow Rate

m3/h

Axial-Flow FansAxial-Flow Fans

Axial Fan Quick Selection Table

Inlet Size :Casing Thickness :

Volume :Pressure :

Fire Rating :Impeller Material :

Casing Material :

400mm – 3150mm4mm – 10mmUp to 1,000,000m3/hUp to 4,000PaUp to 700 oCCorrosion resistant castaluminium, steel, special alloys.Steel, aluminium. Special alloys

The table below shows only a small selection of the type of axial-flow fans that are typically found in our tunnel ventilation systems. Our range contains many more fans and further details are availble on our website or by request. Pleasecontact us for further information.

With a number of different lengths for the silencers, nearly every required sound pressure level can be achieved. Additionally, the specially-developed impellers can operate at very high tip speeds and run at very high temperatures. X-raying of the impeller blades and the impeller hub is not necessary, but can be done upon request.

55.0

55.0

45.0

45.0

37.0

37.0

30.0

30.0

22.0

22.0

18.5

18.5

Rated Motor Power

kW

~2,50085/329.559.41990Reversible, GR1600

Total Mass

kg

Sound Pressure Level, free field, 45°

dB(A)/m

Outlet Speed

m/s

Vol. Flow Rate

m³/s

Thrust

N

TypeDiameter

mm

~2,40070/331.363.02250Uni-Directional, GT1600

~1,85085/332.740.11490Reversible, GR1250


~1,65085/332.431.91180Reversible, GR1120


~1,45085/331.929.5910Reversible, GR1000


~85080/329.018.5610Reversible, GR900

~80075/331.520.0720Uni-Directional, GT900

~52580/337.511.7500Reversible, GR630

~50075/339.012.2540Uni-Directional, GT630

A large range of symmetrical and asymmetrical jet fans is offered by WITT&SOHN AG . The symmetrical fans can be manufactured to generate a partial or completereversibility (i.e. 40%, 60%, 90%, 98%). Additionally, our standard range of jet fans offer a thrust from 35N up to 2,800N. Higher values are possible on request.

Tunnel Jet FansTunnel Jet Fans Jet fans are found in most tunnels throughoutthe world and the WITT&SOHN AG range iscomprehensive. Various designs and accessories are available, information on the fans is found below:

Size :Casing Thickness :

Volume :Thrust :


Casing Material :

400mm – 1800mm *4mm – 10mmUp to 320,000m³/hUp to 2,800NUp to 700 °CCorrosion resistant cast aluminium, steel, special alloys.Steel, aluminium, special alloys

Rheinufertunnel, Germany

Soori Tunnel, S. Korea Jet Fan Quick Selection Table

The table above shows only a small selection of the type of tunnel jet fans that aretypically found in our tunnel ventilation systems. Our range contains many more fans and further details are availble on our website or by request. Please contact us forfurther details.

Testing

A comprehensive testing procedure ensures that our products meet the required specifications. WITT&SOHN AGhave modern test facilities including aheat test chamber. All tests can be certified by nominated bodies such as GL & TÜV.

Standard AccessoriesA standard range of accessories is offered with all fans, these include:• Mounting structures• Vibration attenuators • Protection grills

Special AccessoriesIn addition to standard accessories a number of additional options are also available, these include:

Tunnel Jet FansTunnel Jet Fans

• Bearing temperature monitors (PTC) • Bearing temperature monitors (Pt100)• Space heaters• Certified calculation for mounting structure• Anchor Bolts in 1.4401• Anchor Bolts in 1.4529• Safety switch

Quality AssuredAll jet fans are tested according to ISO 13 350 and all axial-flow fans according to ISO 5801. Additionally, all fans must pass the factory acceptance test before delivery. The jet fans are tested and certified according to EN12101-3.

•Vibration control•Safety wires (material:1.4401)

• Halfenscrews in 1.4401• Halfenscrews in 1.4529 • Vibration control• Service switch in IP65• Temperature Sensor• Outlet Guide Vanes

•• Banana Jet Banana Jet ® Fan DesignFan Design vsvs Standard Tunnel Ventilation SystemStandard Tunnel Ventilation System

The patented Banana Jet ® fan design provides a number of advantages over standard jet fans. From capital cost, to power consumption and size, the Banana Jet Fan ® has numerous short- and long-term benefits. The tables below comparepower consumption, thrust, engineering and costs between a total of 100 standard jet fans and 100 Banana Jet Fans.

Banana Jet ® FansBanana Jet ® Fans

KeyStandard Tunnel Jet Fan Witt Banana Jet Fan

Power ConsumptionPower Consumption

Civil EngineeringCivil Engineering CostsCosts

Fan QuantitiesFan Quantities

Inlet Size :Casing Thickness :

Volume :Pressure :


Casing Material :

400mm – 3150mm4mm – 10mmUp to 1,000,000m3/hUp to 4,000PaUp to 700 oCCorrosion resistant castaluminium, steel, special alloys.Steel, aluminium. Special alloys

50

60

70

80

90

100

110

Thrust / Airflow in Tunnel Quantity of Jet Fans

[%]

50,0

60,0

70,0

80,0

90,0

100,0

110,0

Installed Motor Power Electrical Power Consumption Fan shaft power

[%]

50,0

70,0

90,0

110,0

130,0

150,0

170,0

Jet Fan price Life Time Costs 10Years

Life Time Costs 15Years

Life Time Costs 20Years

[%]

50

60

70

80

90

100

110

Required Jet FanCeiling Niche Length

Required Jet FanCeiling Niche Width

Required Jet Fan WallNiche Length

Required Jet Fan WallNiche Width

[%]

The Banana Jet ® generates 30% more effective thrust in any given tunnel. This jet fan reduces the costs of new tunnel ventilation systems and enables tunnel system upgrades (due to increased traffic load or new fire rules) without high costs.

•WITT&SOHNAG has has developeddeveloped the the newnew „„Banana Jet Banana Jet ®““

The graphs shown left demonstrate thedifference in airflow between standard jet fans and the Banana Jet ® fans.

Figure 1:

Figure 2:

Banana Jet ® FansBanana Jet ® Fans

Banana Jet Quick Selection Table

1990

2250

1490

1650

1180

1430

910

1120

610

720

500

540

Measured thrust

N

~50080/318.539.012.2700Uni-Directional, GT630

~52585/318.537.511.7650Reversible, GR630

~80080/322,031,520,0940Uni-Directional, GT900

~85085/322,029.018.5800Reversible, GR900

~1,40080/330.035.927.81460Uni-Directional, GT1000

~1,45085/330.031.929.51180Reversible, GR1000


~1,65085/337.032.431.91540Reversible, GR1120


~1,85085/345.032.740.11940Reversible, GR1250


~2,50085/355.029.559.42600Reversible, GR1600

Total Mass

kg

Sound Pressure Level, free field, 45° dB(A)/m

Rated Motor Power

kW

Outlet Speed

m/s

Vol. Flow Rate

m³/s

Effective thrust

N

TypeDiameter

mm

Average flow speed 40 m behind

standard jet fans

Average flow speed 40 m behind

the Banana Jet ® fans

+ 30%

thrust

The standard jet fan airflow isshown by Figure 1. At the sides, theairflow is high, buttowards thecentre (of the tunnel) the flow speed drops dramatically.

The Figure 2 demonstrates that the Banana Jet ® fans have a more constant speedthroughout the tunnel. Whilst there is still a drop in speed in the middle of the tunnel, it ismuch less cut out than with the standard jet fans.

WITT & SOHN AG

has not only a range of fans tested to run at 300°C and 400°C for 2 hours, the company has also developed a range that has been full sizetested to operate at 700° C for 90minutes.

Stress analysis Axial fan before testing During testing 700°C

Heat resistanceHeat resistance„Real tests are better than

only calculations“

Service & MaintenanceService & MaintenanceFans installed in tunnels are subjected to varying and often very harshconditions. Temperature changes and air pollution can affect a fans‘s performance. Therefore WITT&SOHN AG recommends and offers a regular service & maintenance. Regular and pre-planned maintenance can and will provide long-term savings.

Tunnel jet fan maintenance

at WITT&SOHNAG factory in

Pinneberg

For comprehensive details please consult our sales staff or the Witt & Sohn Operating & Maintenance Manual.

Our products come with a 12-month warranty, whichcan be extended with a separate service contract.

As well as carrying out maintenance on products supplied by ourselves, we are also able to service fanssupplied by other companies.

The new Elbtunnel, situated in Hamburg, Germany is being hailed by many experts as the safest tunnel in the world. Following a number of catastrophic tunnel fires inrecent years, WITT&SOHN AG has developed a system which makes use of theirunique fan technology.

Under normal conditions, the jet fans are used to control pollution, however in the case of a fire, the damper closest to the fire (shown right) opensand the jet fans switch to fire mode.

It should be noted that the large, extract fans areamongst the most highly engineered in the world. Independently tested by CTICM of France, the fans have been tested for over 2 hours at 700°C.

It is hoped that the Elbtunnel will become the standard by which other tunnels are designed.

In the event of a fire fumes are extractedthrough a separate overhead duct andthen exhausted. Dampers are located at various points throughout the tunnel through which the smoke is extracted.

At the same time as the powerful extract fans are working, jet fans on either side of the fire can blow towards it, keeping theescape routes free to ensure goodvisibility. The concept is shown below.

For further in-formation on thistunnel concept please contact us for a brochure.

Case Study - ElbtunnelCase Study - Elbtunnel

Exhaust Fumes

Fresh Air Direction

Fire

Elbtunnel 4 – A cross section of the tunnel

Elbtunnel 4 – Nearing completion

Damper inspection on siteTwo of the eight extract fans

UKChestfield Tunnel

TurkeyMetro Istanbul I – III

SpainPoblacion de Gatafe

ChinaZhe Yiang

FranceTunnel Drancy

MalaysiaKarak Tunnel

Hong KongShing Mun Tunnels

GermanyElbtunnel 4

ThailandMetro Bangkok, South Line

SwitzerlandNordtangente N2

SwitzerlandSauges et Gorgier

RomaniaMetro Bucharest

NorwayFjellinjen

NorwayEkebergtunnelen

NetherlandsDrechttunnel

Korea (south)Soo-Ri Tunnel

JapanMHI – Tunnel

IcelandTunnel Tungudalur

Hong KongKCRC West Rail

GreeceTunnel Patras

GermanyRheinufertunnel

FranceMetro Toulouse

EgyptTunnel El Azahr

DenmarkNoroskalatunnilin

ChinaChengdu – Chonqing

AustraliaMelbourne City Link

AustriaTunnel Wien

COUNTRYPROJECT

Shown below are a selection of project references from our 200+ worldwidetunnel installations.

WITTWITT&&SOHN SOHN

Tunnel ReferencesTunnel References

VentilatorenIGW

PSB, Europe‘s leading company for Impulse Ventilation Systems (IVS) of underground car parks is a memberof the Witt Group.

Unique impulse fans have beendesigned for the system which monitors and controls the innerenvironment of an underground carpark. The fans have beenindependently tested to run at 300oC for 2 hours to conform to the EN 12101-3 standard.

It is in the event of a fire that the system comes into its own. Varioustests have shown the system‘s effectiveness, however 2 real fireshave proven the system‘s worth to thefire services, engineers, the car parkusers and also the car park‘s owners. In the most recent fire at the Ceramique Nordknoop Parking in Maastricht, with 2 cars fully destroyed, the car park was re-opened within 30 minutes of the fire having started.

Car Park VentilationCar Park Ventilation

Larger impulse fans are used forcar parks with higher ceilings, inaddition to service roads and delivery bays, in which the fansshown right are installed.

Witt & Sohn AG

Postfach 22 62Wuppermanstraße 6 – 10

D – 25421 Pinneberg, Germany

+49 (4101) – 7007 – 0

+49 (4101) – 7007 – [email protected]

www.wittfan.de

Tel:Fax:

Email:Web:

Fan Systems GroupBrookwoods Industrial Estate

Burrwood Way, Holywell Green

Halifax, HX4 9HB, UK

+44 (1422) 378 131+44 (1422) 1422 378 672

[email protected]

Tel:Fax:

Email:Web:

Meidinger AGBinnigerstraße 84

CH – 4123 AllschwilSwitzerland

+41 (61) 4874411

+41 (61) 61 4874400

[email protected]

Tel:Fax:

Email:

Web:

Head Office

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