tunnel ventilation and safety - papar presented at ipwe seminar 2014
DESCRIPTION
The presentation covers the basics of Railway tunnel Ventilation and Safety in the context of Pir Panjal Tunnel T-80. The basic reference document has been UIC Codex 779-9.TRANSCRIPT
TUNNEL VENTILATION AND FIRE SAFETY
A case study of Pir Panjal Tunnel
T-80 of USBRL Project -Hitesh Khanna
Ircon International Limited
PIR PANJAL TUNNEL- AN OVERVIEW
• IRCON INTERNATIONAL LIMITED is the principle execution agency for DHARAM-QAZIGUND-BARAMULLAH section of USBRL project of Northern Railway.
• Pir Panjal Tunnel, between Qazigund and Banihal, is the landmark tunnel of the project, connecting Kashmir Valley to Jammu Region.
• At 11.215 Kms., it is the LONGEST transportation tunnel in India.
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T 80 ON USBRL PROJECT
3
T80 SECTION AND PLAN
4
5
• Max Over burden 1100 mts.
• B. G. Rly. S/L Track
• 3 mts. Road
• 48.5 m2 X-Sec Area
• Water Proof
UIC Codex 779-9 R Safety In Railway
Tunnels
• To the Extent That Safety is regulated at National level, it shall be defined by National Authorities.
• General Principles: 1. Prevent Accidents
2. Mitigate the Impact of accidents
3. Facilitate ESCAPE
4. Facilitate Rescue 6
UIC Codex 779-9 (contd…)
• Tunnels:
– Minimal Avalanche, Landslides, L-Xing accidents.
– Accidents/Train Km is lower, but critical (Fire)
• For General Public, psychologically, Risk perception is higher for Tunnel Accidents – (LOW FREQUENCY- HIGH IMPACT compared to Level Xing
accidents- HIGH FREQUENCY- LOW IMPACT)
• As FIRE in Passenger Trains is a Major and Specific Risk, the Main Focus is on this type of Accidents.
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UIC Codex 779-9 (contd…)
• Applies to Electrified / Non-electrified Tunnels, and High Rock Cover
• For New Planned Tunnels, longer than 1 Km. but upto 15 Kms. – General Strategy is to get the train out of Tunnel (with
in 15 min. of fire). – Disable Emergency Brakes (operating measures)
• If despite measures, train on Fire comes to stand still inside the tunnel: – Facilitate self ESCAPE to SAFE PLACE – Distance between two safe places not more than 1 Km – Cross passage at not more than 500 mts.
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Ventilation Requirement
• Normal Operation: (Depends on Traction Mode and local conditions):
– Maintain Sustainable Air Quality in side the Tunnel • Pollutant Levels • Oxygen Levels • Temperature
• Emergency Rescue Management: (for both Diesel and Electric Traction- Fire Load may vary)
– Fire and Smoke Management to Assist Emergency Evacuation Strategy
– Fire Effect Mitigation
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VENTILATION SYSTEMS
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• Longitudinal – Air Set in Motion along Tunnel Axis
• Portal to Portal, Same speed though out the Tunnel Length
• No Division into Aerodynamic Segments
• Low Cost, Does not need Transverse air Egress Points
• Time to Purge Foul Air depends on Air Flow Velocity, Tunnel Length
VENTILATION SYSTEMS (contd.)
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• Transverse
– Two Independent Ducts (Fresh Air Inflow and Exhaust air exit)
• Can create Aero dynamic Sections (In case of Fire)
• May Need Transverse Exit Routes (Low Overburden Ventilation Shafts, Stations in Metros
• Costlier to Install, and operate (More Aerodynamic Losses)
VENTILATION SYSTEMS (contd.)
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• Semi-Transverse
– Combination of Longitudinal and Transversal System:
• Separation of Fresh and Exhaust air
• Reversible-
• Fire Case Fresh Air through Portal, Exhaust through Ventilation Stack, Permitting Aerodynamic Separation
• Normally, Fresh air Through Ventilation Stacks
• Larger Tunnel X-Section
VENTILATION SYSTEMS (contd.)
• Considering the merits and demerits of each ventilation system and since there is no station and stop in pir-panjal tunnel; – longitudinal ventilation system has been
considered fit to apply in this tunnel
– worldwide also, only longitudinal ventilation is applied to rail/road tunnel or underground projects.
• Only in underground stations and stops, transversal and semi transversal might be applied.
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Normal Case: Calculation Of Fresh Air Flow
• Para 3.6.2
– Fresh Air Demand due to Gaseous Emissions
– Fresh Air Demand due to Particulate Emissions
– Fresh Air Demand oxygen Depletion (Diesel Engine)
– Normalization Of Temperature (Below 40 deg. C) after passage of 5000T train Uphill
• Ventilation Design (Normal Case- Para 4.0)
– Time to restore Safe Conditions Inside the Tunnel
– Waiting Time for Next Train to enter (after exit of Uphill Loaded Train)
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LOCO MOTIVE EXHAUST DATA
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emission
g/kWh ORE UN UIC
US EPA
(line haul
locomotive,
Tier 0)
WDM2/ALCO
2530HP
WDM3A/AL
CO 3073HP
WDM4/ALCO
4000HP
CO 3 6.7 3 6.71 0.52 0.72 0.56
NOX 12 12.7 10 10.73 13.56 12.42 7.62
Particle 0.5 0.8 0.25 0.30 ??? ??? 0.39
measured emission dataStandards
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STANDARD THRESHOLD POLLUTION LEVEL
American Conference of Governmental and Industrial Hygienists and Continuous Limit for working environment. (Ref. DPR)
1) Long Term Sustainable Threshold Values for Industrial Working Environment (8 hours working)
2) Non-Continuous Exposure, with intermittent Air Exchange
3) Limits up-to 15 minutes exposure
(1) (2) (3)
CO 50 75 400
NO 25 37.5 35
NO2 5 5 5
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Design
Limit
Pir Panjal
CO 50 ppm 200 ppm 50 ppm
NO 25 ppm 35 ppm 90% of NOx
NO2 4 ppm 5 ppm 10% of NOx
Sum: NOx 29 ppm 40 ppm 25 ppm
CO2 5000 ppm 10000 ppm 5000ppm
SO2 5 ppm 5 ppm 5ppm
Particulates
(PM)Not defined Not defined
< 0,012m -̂1
(extinction
coefficient)
Temperature 40°C 50°C for a train passing, max.65°C -
Element8 Hours
Exposure15 Min. Exposure
ADOPTED THRESHOLD ENVIRONMENT PARAMETERS
Page 18
Ventilation Requirement with Electric Traction
► No ventilation required for regular operation
► Fire load for electric locomotives < Diesel powered ones
►
According to design procedure and UIC
→ fire load depends on type of train
→ typical criteria *:
● Diesel → Peak 20 MW
● Electric → Peak 12 MW
● Passenger train → Peak 25 MW
● Freight train → Peak 8-52 MW (depending on load)
► Chosen design criteria → 40 MW
► Electric traction does not impact ventilation design
* According to Deutsche Bahn AG
Thermo Dynamic Data
ITEM REFERENCE Geothermal Heat Input Depending on Parent Rock Temperature and Temp. Gradient to Tunnel Rock Surface
Para 3.2.2
Temperature, Pressure and Density Gradient of Air Inside the Tunnel
Para 3.2.2.1
Portal Meteorological Data Para 3.2.3
Portal Temperature, Wind Pressure, Natural Buoyancy Pressure and Pressure Differential between the Portals
Para 3.2.3.1, 3.2.3.2, 3.2.3.3, 3.2.3.4
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Aero Dynamic Data
ITEM REFERENCE Tunnel Characteristics:
Portal Losses, Tunnel Wall Friction, Wind Velocity at Portals Air Pressure and Temperature Air Density
Para 3.4
Critical Velocity Critical Froude Number Temperature Near The Fire Scene
Critical Velocity to prevent Back Layering Constant Air flow to Blow the Smoke away from Passengers Exiting in Other Direction, Drive HC Vapours Away from Fire Source to avoid Flash Over
Jet Fan Installation Factor & Piston Effect Of The Train and Train Data
Para 3.5 & 3.6
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THERMODYNAMICS ...buoyancy…
temperature rise leads to lower density of air warm mass of rock
heat of train
…. and to longitudinal velocity - chimney effect
a thermodynamic effect
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...wind pressure and meteorological effects...
T u n n e l
wind pressure effect depends on:
- meteorological situation
- tunnel data wind pressure
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Ventilation Design Approach Natural velocity achieved inside tunnel :
AERODYNAMICS ...piston effect …
T u n n e l
depends on: for the Pir Panjal tunnel
the piston effect leads to:
• longitudinal velocity of about 5.34 m/s
• fresh air of about 241 m3/s
- ratio between tunnel and train cross section area
- tunnel resistance: length of tunnel, wall friction and others
- speed of train and aerodynamic drag
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Boundary Condns. (Geometry)
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Description Details
Tunnel length 11.215 m
Length from Banihal Station to South
portal
1450 m
Length from North Portal to
Qazigund Section
4774 m
Finished cross section 48.50 m2
Average elevation above sea level 1734.75 m
Boundary Conditions (Geometric Data)
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Train with 40 km/h needs about 17 min to pass tunnel
l o n
g i
t u
d i
n a
l v
e l
o c
i t
y
longitudinal velocity
-5,00
-4,00
-3,00
-2,00
-1,00
0,00
1,00
2,00
3,00
4,00
5,00
0 60 120 180 240 300
time [min]
[m/s
]
TRAIN SIMULATION TO ASSESS VENTILATION NEED
For normal operatrion
No artificial ventilation is needed
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What happens if a tunnel fire occurs ?
even in the upstream direction against the longitudinal velocity!!
the tunnel roof fills with smoke
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Ventilation For Fire and Smoke Management
Ventilation For Fire and Smoke Management
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• Avoid Backlayring
– Critical Velocity of Airflow to be Maintained
• Smoke To Be Directed, to Permit Escape in other direction
"BACKLAYERING
Stratification Of Smoke
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• Smoke Rises to Top
– Permits Escape Underneath in cooler air
– Flashover Control
• Typically Stratification lasts for 500-800mts
– 30-40 MW fire
– Tunnel Geomtry, Slope
– Air Flow Conditions
VENTILATION DESIGN INPUTS SMOKE CONTROL
• Input Parameters
– What is the maximum size of any fire, which may reasonably be expected to occur, given the use of tunnel
• (Design Fire Curve- Fire/Smoke Vs. Time)
– What Corresponding Ventilation is required to prevent smoke Backflow
• Critical Velocity to be attained
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• Select Design Fire Load: Investigations were performed by Deutsche Bahn AG – Diesel Loco → Peak 20
MW – Electric Loco → Peak 12
MW – Passenger train → Peak
25 MW – Freight train → Peak 8-
52 MW (depending on load)
• Design Fire Adopted 40 MW (Two Dsl. Loco in Tandem)
Emergency Ventilation Design Fire
TEMPERATURE / SMOKE PROGRESSION ALONG THE LENGTH HEIGHT
Computation fluid dynamics (camatt)
– Design Fire
– Tunnel Geometry
– Fan design & Configuration
– Thermo Dynamics
– Fluid Dynamics 33
Emergency Ventilation Design Approach:
TEMPERATURE / SMOKE PROGRESSION ALONG THE LENGTH HEIGHT BY NEAR FIRE CONDITIONS BY 3DCFD Objective:-
– To clarify condition d/s of fire
– Influence of longitudinal flow velocity on the tenability d/s from fire
– Design Fire load 25 MW – Smoke plum should remain
2.5m above rail level during self evacuation time
– Use of Deutsche Bahn Fire curve for smoke release rate and critical velocity
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Emergency Ventilation Design Approach:
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FINAL VENTILATION DESIGN
Jet Fan (Main Tunnel)
Jet Fan (Access Tunnel)
Ventilation Actuation:
Visibility detection
Airflow measurement
Automatic operation
Basic ventilation
Visibility data
Airflow direction
Wind speed
Fire Ventilation
Fire Alarm
Visibility data
Airflow direction
Wind Speed 36
Ventilation System -Installations Sr.No. Description of Items Qty. Location Fixing height Spacing
1 Jet Fan
a) Main tunnel ( Five Groups) 25 MVS 3.5 Mtrs. 150Mtrs.
b) Adit Tunnel 3 Adit 4.0 Mtrs. 150 Mtrs
2 Air Velocity Measuremnt. 21 Each next MN 4.0 Mtrs. 500 Mtrs.
3 CO/Dust Particle 21 Each next MN 4.0 Mtrs. 500 Mtrs.
4 Proximity Sensor
a) Main tunnel 25 Each Jet fan 150 Mtrs
b) Adit Tunnel 3 Each Jet fan 150 Mtrs
5 PT 100 Unit (Temp Sensor)
a) Main tunnel 75 Each Jet fan (3) 150 Mtrs
b) Adit Tunnel 9 Each Jet fan (3) 150 Mtrs
6 Vibration Sensor
a) Main tunnel 25 Each Jet fan 150 Mtrs
b) Adit Tunnel 3 Each Jet fan 150 Mtrs
7 ADIT Axail Fan 2 Adit tunnel 3.0 Mtrs. 4.0 Mtrs. 37
E&M System
Consists of the following
433/250V – 50 Hz Power Supply
Emergency Power Supply
Earthing & Potential Equalisation System
Tunnel Lighting
Tunnel Fittings
Fire Detection System
Building Power & Lighting Installations
Room Ventilation & Air Conditioning 38
Redundant Power Supply ~ I-67, I-65
CCTV System I-68
Emergency and Service Phone
System I-42
Tunnel Radio System I-66, I-2
Public Address System (Speaker
System) ~
Fire Detection System
Fire Fighting System (Water Line,
Extinguishers)
I-24, I-64
Ventilation System I-25
Emergency Lighting I-41
Control Centre ~
Escape Distance to be not more than
1000 mts.
I-43
Page 39
System Compliance World Standard
Pir Panjal Comments UIC
~
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T-80 TUNNEL CONTROL MONITORING CENTRE
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MULTI SCRN TUNNEL VIDEO MNTRING - WITH MOTION SENSOR TRIGGERS
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CCTV MONITORING
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VENTILATION FUNCTION
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ESS FUNCTIONING SCRN
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LIGHT & EROS MONITORING
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EVENT LOG
VENTILATION CONTROL STRATEGY REQUIREMENTS TO THE STAFF (NORMAL
OPERATION) Train staff
►Report about type and direction of train
entering the tunnel
►Break down: Report the location of the break
down
Control center staff
►Know about train type and direction
►Monitor emission levels in the tunnel
►Monitor appropriate operation of ventilation
►Instruct the train driver to shut down engines (if
necessary) 47
Ventilation Control Strategy Requirements to the staff (emergency operation)
Train staff
►Guide passengers in the right direction
►Communicate and Local Guidance for Passenger
Rescue
Control center staff
►Select and confirm the appropriate mode of
operation
►Monitor the appropriate mode of ventilation
►Support rescue operation (e.g. coordinate the
rescue train)
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• Detailed Design Consultants – M/s Geoconsult-
RITES JV
– Overall Tunnel Design and Top level Supervision, observations based On-site design with NATM approach
– Ventilation, Rescue, E&M Design
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• HBI Haerter
– Ventilation Design Proof Check
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MAIN TUNNEL
ESCAPE TUNNEL
CROSS-PASSAGES
RAILWAY TUNNEL (T-74R) LAYOUT (AS PER UIC 779)
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