THE A10-TAUERN TUNNEL VENTILATION SYSTEM FROM A CONTRACTOR S PERSPECTIVE. (Experiences and lessons learned)

Transcription

1 THE A10-TAUERN TUNNEL VENTILATION SYSTEM FROM A CONTRACTOR S PERSPECTIVE. (Experiences and lessons learned) Van Vemden F, Hofstede W. Zitron Nederland B.V. 6 th Conference Tunnel Safety and Ventilation Graz April

2 Contents 1. Introduction 2. Design review of the ventilation system 3. Room- and installation limitations 4. Acceptance tests 5. Cross passage ventilation 6. Fan stall prevention 7. Contractual aspects 8. Local participation 9. Conclusions and recommendations 6 th Conference Tunnel Safety and Ventilation Graz April

3 Parties involved Customer: ASFINAG Bau Management GmbH Ventilation system design: FVT - Forschungsgesellschaft für Verbrennungskraftmaschinen und Thermodynamik m.b.h. Site supervision (Örtliche Bauaufsicht, ÖBA): IDS Beratende Ingenieure GmbH Contract supervision (Begleitende Kontrolle BK): Hopferwieser Consult Ziviltechniker GmbH Ventilation System review: ILF Beratende Ingenieure m.b.h. 6 th Conference Tunnel Safety and Ventilation Graz April

4 Ventilation system South Portal Cavern North Portal AS01 ZS01 AS02 AS03 AS04 ZS01 ZS03 ZS04 Title Q m3/s P Pa Pmot. KW AS AS AS AS ZS Fresh air impulse damper Fire damper Fresh air throttle opening Vertical duct damper ZS ZS ZS Switch over damper 6 th Conference Tunnel Safety and Ventilation Graz April

5 Design review Elements for discussion: 1. Installation of additional Fresh air impulse damper 2. Ventilation - and design concept in case of fire 3. Cross passage ventilation 6 th Conference Tunnel Safety and Ventilation Graz April

6 Fresh air impulse ventilation Percentile value Processing of the Pressure differences at the portals Processing of the Shaft Natural Draught 95- Percentile ZAMG Design (Planer) NP SP SP NP Shaft-Draught Up Shaft-Draught Down Pa Pa Pa Pa = 71 Pa x 48 (Traffic Area) = 3400 N Thrust (120 kw Jet fan Power) 6 th Conference Tunnel Safety and Ventilation Graz April

7 Room- and installation limitations 6000 AS-01 Exhaust 2140x2140 ø x 2140 Wire mesh (FMU) Exhaust 3000x3000 ø2522 Wire mesh 6 th Conference Tunnel Safety and Ventilation Graz April

8 Room- and installation limitations 6000 AS-01 Exhaust 2140x2140 ø x 2140 Wire mesh CFD calculations to optimize inlet and outlet shape (ILF) 6 th Conference Tunnel Safety and Ventilation Graz April

9 Room- and installation limitations (FMU) 2140x2140 ø x x3000 ø2522 Tauern Exhaust Fan AS01 (Impellerdiameter 2510 mm.) Volume Duct v P-dyn. Component m3/s m2. m/s Pa ζ [ - ] P Pa Optimum Duct lay-out Duct v P-dyn. m2. m/s Pa Inlet part: Screen 160 4,84 33,06 639,30 0,10 63,93 9,00 17,78 184,89 0,10 18,49 Inlet piece 160 4,84 33,06 639,30 0,05 31,97 9,00 17,78 184,89 0,09 16,64 Discharge duct / Diffuser: Inlet 160 3,38 47, ,22 3,38 47, ,22 Outlet 160 3,27 48, ,25 4,61 34,67 703,26 Efficiency / factor 160 0,15 12,90 0,15 91,34 Impuls losses 3>4 With innerpipe 160 3,71 43, ,28 5,05 31,67 586,87 Without innerpipe 160 4,84 33,06 639,30 60,89 6,18 25,88 391,87 20,13 Fan isolation dampe 160 3,71 43, ,28 0,25 272,07 9,00 17,78 184,89 0,25 46,22 Total Fan pressure losses 441,76 192,82 In- and outlet concrete duct losses (based on assumption of 1,5 x dynamic loss) 958,95 277,33 Total losses 1400,71 470,15 Fan Power at 85% efficiency 263,66 88,50 ζ [ - ] P Pa 6 th Conference Tunnel Safety and Ventilation Graz April

10 Room- and installation limitations CAVERN DIRECTION SALZBURG 6 th Conference Tunnel Safety and Ventilation Graz April

11 Room- and installation limitations CAVERN DIRECTION VILLACH 6 th Conference Tunnel Safety and Ventilation Graz April

12 Room- and installation limitations Cooling air ducts Tunnel Tube Sbg. Hydraulic & air measurement piping 6 th Conference Tunnel Safety and Ventilation Graz April

13 Acceptance tests 1. Leakage test 2. Flow measurements at different fire scenarios 3. Fire test 6 th Conference Tunnel Safety and Ventilation Graz April

14 Acceptance tests LEAKAGE TEST FAN M1 M2 V1 V2 Leakage Duct (v-duct) = v1 - v2 FAN M1 M2 V1 V2 Leakage Fire Dampers = v1 - v2 - v.duct Damper in open position Damper in closed position with foil closure M1 = Measuring section 1 >> V1 = Air flow M1 [m³/s] M2 = Measuring section 2 >> V2 = Air flow M2 [m³/s] Damper in closed position without foil closure 6 th Conference Tunnel Safety and Ventilation Graz April

15 Acceptance tests CAVERN FIRE TEST SOUTH PORTAL AL ZL Ventilation section 3 Ventilation section 4 A Duct damper, closed position Wall Natural draught A View A-A 6 th Conference Tunnel Safety and Ventilation Graz April

16 Acceptance tests Fire test Tunnel tube Sbg.: Block 142 & 354 Tunnel Tube Vil.: Block 150 & th Conference Tunnel Safety and Ventilation Graz April

17 Das Bild kann zurzeit nicht angezeigt werden. Cross passage ventilation Design Options 1. Speed control with pressure sensor and door switches (Tauern) 2. Overpressure damper 3. Overpressure opening or fire damper 6 th Conference Tunnel Safety and Ventilation Graz April

18 Cross passage ventilation Cross Passage AL ZL Cross passage fan in operation ZL AL RFB Salzburg Air supply RFB Villach Escape route Escape door Design data 1. Overpressure in the cross passage with both escape-doors closed: 50 Pa. 2. In case of one escape-door open (ca. 2 m2 open area) Airflow 5 m3/s (velocity 2,5 m/s.) 6 th Conference Tunnel Safety and Ventilation Graz April

19 Das Bild kann zurzeit nicht angezeigt werden. Cross passage ventilation Speed control of the fan(s) Pressure sensor and Door switches Advantage: - No overpressure damper Disadvantages - Accelerating and decelerating fans takes time - Control system necessary 6 th Conference Tunnel Safety and Ventilation Graz April

20 Cross passage ventilation System with overpressure damper 6 th Conference Tunnel Safety and Ventilation Graz April

21 Cross passage ventilation System with overpressure damper 6 th Conference Tunnel Safety and Ventilation Graz April

22 Cross passage ventilation System with overpressure damper 6 th Conference Tunnel Safety and Ventilation Graz April

23 Cross passage ventilation System with overpressure damper 6 th Conference Tunnel Safety and Ventilation Graz April

24 Cross passage ventilation System with overpressure damper 6 th Conference Tunnel Safety and Ventilation Graz April

25 Cross passage ventilation System with pressure relief opening or fire damper 6 th Conference Tunnel Safety and Ventilation Graz April

26 Cross passage ventilation System with pressure relief opening or fire damper 6 th Conference Tunnel Safety and Ventilation Graz April

27 Cross passage ventilation System with small (0,5 m2) overpressure damper and slide doors (Pmax=120 Pa) 6 th Conference Tunnel Safety and Ventilation Graz April

28 Fan stall prevention 6 th Conference Tunnel Safety and Ventilation Graz April

29 Fan stall prevention 6 th Conference Tunnel Safety and Ventilation Graz April

30 Commercial aspects Price escalation (ÖNORM B2111) Indices Labour: Baukostenindex Baunebengewerbe Split-up Lüftung und Klima 100% Product: Labour: Baukostenindex für Lüftung und Klima 60% Material: Großhandelspreisindex Eisen und Stahl 40% 6 th Conference Tunnel Safety and Ventilation Graz April

31 Commercial aspects Entwicklung Großhandelspreisindex Eisen und Stahl Großhandelspreisindex Jun 08 Jul 08 Aug 08 Sep 08 Oct 08 Nov 08 Dec 08 Jan 09 Feb 09 Monat Mar 09 Apr 09 May 09 Jun 09 Jul 09 Aug 09 Sep Eisen und Stahl Sonstiges Lohn 6 th Conference Tunnel Safety and Ventilation Graz April

32 Commercial aspects Example: Price basis 0-date June 2008 Due date Sept Labour: 127,78 132,69 Others: Labour: 130,02 138,5 Material: 174,6 94,2 Price Splitup Po without Lo / Mo Ldd / Mdd Price factor Pdd with % esc. % esc. % labour Product: 80 Product split-up Labour Material th Conference Tunnel Safety and Ventilation Graz April

33 Local Participation 1. Facilitating and assisting in local assembly. 2. Supply of steel construction work. 3. Education of local employees / staff. 4. Local handling of service- and maintenance work. 5. A quick response time in case of failure or damage. 6 th Conference Tunnel Safety and Ventilation Graz April

34 Local Participation 6 th Conference Tunnel Safety and Ventilation Graz April

35 Conclusions, Recommendations 1. Design review The design review has to take place immediately after contract award to cover for possible consequences in time. 2. Fan room and duct dimensions Allowing for sufficient space for fans and ventilation components will reduce capital cost and energy consumption. 3. Acceptance tests Carrying out site tests is not only required to prove system performance but can also reveal further optimisation possibilities. 4. Cross passage ventilation More attention should be given to the response time for pressurizing cross passages and the control thereof. 5. Price escalation Customers may, in co-operation with contractors, allow for limits in price variation to limit overall economic risk for longer term contracts. 6. Local Participation Local participation contributes to local interest and substantial reduction of cost for travelling and lodging. 6 th Conference Tunnel Safety and Ventilation Graz April