smoke control requirements for new railway infrastructure ir...

Smoke Control Requirements for

New Railway Infrastructure

Ir Peter Law

Overview

Conclusion

Smoke Control Systems of Railway Projects

Formulation of Fire Safety Requirements

Regulatory Regime for Railway Fire Safety

Railway Development in Hong Kong


Railways provide a reliable, fast and safe services to alleviate

the pressure on the road network.

Railway development in Hong Kong has experienced very

fast growth.

The urban rail network has covered most of the urban areas

in Hong Kong.

Figure from MTRC - http://www.mtr.com.hkTotal Rail Length: approx. 218 Km

0

20,000

40,000

60,000

80,000

100,000

120,000

140,000

160,000

180,000

Jul-15 Aug-15 Sep-15 Oct-15 Nov-15 Dec-15 Jan-16

Mo

nth

ly T

ota

l

(Un

it in

th

ousan

ds)

Month

Intercity, Light

Rail & Bus

Cross-boundary

Airport Express

MTR Lines

Statistic data from MTRC - http://www.mtr.com.hk

MTR - Historic Patronage Figures

Daily Average (Patronage): Over 4.5 Million


5 new railway lines

觀塘綫延綫

XRL(under construction)

SCL(under construction)

WIL(Dec 2014 Completion)

SIL(E)(Dec 2016 Completion)

KTE(Oct 2016 Completion)

Policy Address2007-08

Railway Development Strategy 2014

Providing a framework for

planning the future expansion of

Hong Kong’s railway network up

to 2031.

Total length of the railways will

extend to over 300 Km by 2031.


The Railway Development Strategy (RDS) Division

of Hong Kong Fire Services Department (FSD)

established on 2 April 2001.


車站及運輸綜合委員會

Trackside Safety and Security Committee

Station and TransportIntegration Committee

軌道安全及保安委員會

Safety and Security Coordinating Committee

安全及保安統籌委員會

FSD is one of the core members of SSCC, TSSC and STIC.

CODES OF PRACTICE

FOR

MINIMUM FIRE SERVICE INSTALLATIONS

AND EQUIPMENT

AND

INSPECTION AND TESTING OF

INSTALLATIONS AND EQUIPMENT

April 2012

Prescriptive Requirement


FSI Code FS CodeFSD Circular Letters

file:///D:/LOKFolder/PPt/ExitSign.pdf

CIBSE Guide ESFPE Handbook


Fire Engineering Design


Guidelines on Formulation of Fire

Safety Requirements for New

Railway Infrastructures

1st Edition

2nd Edition

3rd Edition

Fire Safety Strategy (FSS)

Trackside Fire Safety Strategy (TFSS)


Guidelines on Formulation of Fire Safety Requirements for

New Railway Infrastructures

1st Edition

- Issued in January 2013

- Essential fire safety measures of railway lines

2nd Edition

- Issued in August 2013, bilingual version

- Fire safety provisions of EAP, EEP, CP and site office

- Special features of deep railway station

3rd Edition

- Issued in October 2016, bilingual version

- General design requirements for smoke control

systems

Smoke Control Systems in Railway Projects

Smoke and hot gases are recognized as the major

hazard.

The control and essential removal of smoke from the

premise is crucial for fire safety.

The provisions of smoke control systems provide smoke

free conditions and control the smoke spread for

massive evacuation and fire-fighting.

New Practical Guidelines

A new practical guidelines on smoke control systems for new railway infrastructures were developed and have been incorporated into Appendix VII of the guidelines.

Annex a – Dynamic Smoke Extractions System

Annex b – Pressurization of Staircase

Annex c – Tunnel Ventilation System

Smoke Extraction System (SES)


Dynamic smoke extraction system is provided for:

A Place of Safe Passage for 60 minutes (minimum).

Cabin Concept for Concession Area.


Fire Compartmentation

Fan room accommodated more than one smoke extraction

system.



All fans of the dynamic smoke extraction system forming part

of a fire rated duct.

The fan room shall contain no other services.


Verification on System Performance

The designer of dynamic smoke extraction system

shall be a registered professional engineer in the

discipline of building services, fire or mechanical

engineering.

Drawing and all calculations of dynamic smoke

extraction system.



Hot smoke test shall be conducted in accordance with

the requirements as stated in FSD Circular Letter

2/2002.

Hotsmoke.mpgHotsmoke.mpg


Smoke Discharge Arrangement

Dedicated vent shaft shall be designed for smoke extraction purpose and it shall contain no other services.

In order to prevent re-circulation of smoke into the system through the vent shaft, the smoke discharge outlet and fresh air intake louver shall be separated by not less than 5m in any direction from all air inlets or other building openings.

No discharges shall be at a height above the surrounding horizontal surface of less than 3m to the bottom of the outlet and where below 6m shall not discharge downwards.

Cabin Concept

- Sprinkler Controlled Fire

- Combination of smoke detection, sprinklers and a designated smoke extraction system.


Concession Areas

The Cabin Concept is applied to concession areas of the station.

Smoke Extraction System (SES)System Operation

For parallel arrangement of smoke extraction fans or make

up air fans, motorized fire and smoke dampers shall be

provided for both suction side and discharge side to avoid

system short circuit and smoke re-circulation.

Smoke Extraction System (SES)System Operation

The smoke extraction system and associated ductwork/ equipment shall be

operated at 250oC for not less than 1 hour.

In case the smoke temperature is higher than 250oC, additional smoke

extraction rate shall be provided to allow sufficient make-up air inside the

smoke zone.

Otherwise, fire rated protection with higher fire rating shall be applied to

the smoke extraction system and associated ductwork/ equipment.

The designer shall substantiate the smoke extraction rate and smoke

temperature based on the design fire size and clear smoke height.


System OperationSmoke extraction fans and make-up air fans shall be electrically

interlocked.

Smoke detection system, sprinkler flow switch and manual override

facility.

Once started, smoke extraction fans and make up air fan shall run

continuously until stopped manually.

Integrated Back-up panel (IBP)

Manual Override Panel for

Smoke Extraction System

Main AFA Panel


System ReliabilityTwo dedicated electrical supplies shall be

routed separately into the plant room and then connected into the switchboard for smoke extraction system.

The switchboard serving smoke extraction system shall be located in plant room next to the fan room of smoke extraction system.

The plant room shall not contain other equipment.

Switchboard for smoke extraction system shall not be grouped with other services or installations.

Smoke extraction fan shall be installed in duplicate with automatic changeover facilities.

Pressurization of Staircase (SPS)


Staircase pressurization system is provided for:

Maintain positive pressure within the protected space

(pressurization)

Fireman’s staircases and corresponding staircase lobbies and

fireman’s lift lobbies.

Design standards

BS 5588 Part 4

FSD Circular Letter No. 02/2006



Dedicated pressurization fans shall be designed for the staircase and protected lobbies.

The supply air duct serving the pressurized staircase has to penetrate the staircase enclosure, the portion of the duct located outside the staircase shall be enclosed by the same fire rating as the pressurized space or fire compartment passed, whichever is greater.

Other non-essential services shall not pass through / not be installed at the protected lobby / staircase.

Fan room Fan room

Pressurized

50 Pa

MOA Staircase Fireman’s Lift

LobbyAccommodation

Pressurized

45 Pa

Fresh airFresh air

Pressure

Relief

Air Release

Vent

Shaft

0 Pa

Direction of air flow (Open door scenario for MOA staircase)

2 m/s

20140904 Smoke Bomb Test for KET to SYP/HKU to SYP (mode 755).MP420140904 Smoke Bomb Test for KET to SYP/HKU to SYP (mode 755).MP420140904 Smoke Bomb Test for KET to SYP/HKU to SYP (mode 755).MP420140904 Smoke Bomb Test for KET to SYP/HKU to SYP (mode 755).MP420140904 Smoke Bomb Test for KET to SYP/HKU to SYP (mode 755).MP420140904 Smoke Bomb Test for KET to SYP/HKU to SYP (mode 755).MP420140904 Smoke Bomb Test for KET to SYP/HKU to SYP (mode 755).MP420140904 Smoke Bomb Test for KET to SYP/HKU to SYP (mode 755).MP4



The designer of staircase pressurization system shall be a registered professional engineer in the discipline of building services, fire or mechanical engineering.

The provision of air release shall be provided to the accommodation.

The air release fan, ductwork and other associated equipment shall be suitable for continuous operation for the appropriate period of time and temperature as specified in the BS5588: Part 4 and FSD Circular Letter No. 2/2006.



The smoke discharge shall be remote from and preferably down-wind of the intake of fresh air in order to prevent re-circulation of smoke.

The discharge end / louvre of air release shall not be mixed with other louvre or system.

Air release discharge outlets for staircase pressurization system shall be separated by not less than 5m in any direction from all air inlets or other openings into any building.



System Configuration

Dedicated plant room and vent shaft

shall be allocated for staircase

pressurization system.

All fans of the staircase

pressurization system for serving different

fire compartments shall be installed in

separate plant rooms with appropriate fire

rated enclosure.

The provision of air release and

pressure relief shall be vented by

dedicated vent shaft.

Other services or ductworks shall

not be connected to the vent shaft for any

other purpose.


System Operation

For parallel arrangement of staircase pressurization fans, motorized fire and smoke dampers shall be provided at both suction side and discharge side to avoid system short circuit.

When fire occurred within a pressurized staircase and detected by smoke detectors, the activation of the associated pressurization system shall be disabled. The staircase pressurization systems of other staircases shall be activated.

Once started, staircase pressurization fan(s) shall run continuously until stopped manually.


System Reliability

Duplicate fans instead of dual motors shall be adopted.

Dedicated switchboard shall be designed for the staircase pressurization system and shall not be grouped with other systems.

The switchboard shall be located in the plant room next to the fan room for the staircase pressurization system.

The plant room shall not contain other equipment. If not, the switchboard shall be provided with proper fire rated enclosure.

Tunnel Ventilation System (TVS)


Tunnel ventilation system is provided for:

Drawing in fresh air from one end of the affected tunnel and

expelling smoke at the other end via the vent shaft.

Preventing “back layering” of smoke in the direction of

passenger evacuation.

Maintaining a smoke free path for emergency evacuation and

fireman’s access in case of fire.


Back-layering

The reversal of movement of smoke and hot gases counter

to the direction of the ventilation airflow.

Critical velocity

The minimum steady-state velocity of the ventilation

airflow moving toward the fire

within a tunnel or passageway

that is required to prevent

back-layering at the fire site

Tunnel Ventilation System

(TVS)

Evacuation Direction

Pull Push

‘Push-Pull’ Effect

Continuous operation at 250oC

for ≥ 2 hour

Case 1 : ‘Train head” portion fire


(TVS)

Evacuation Direction

Push PullCase 2 : ‘Train tail” portion fire

Reversible

Push & Pull direction


Ventilation Building Smoke Vent


Tunnel Ventilation Fans



Up-track and down-track of the tunnel shall be considered as different fire compartments.

No other services or equipment shall be installed or located inside the tunnel.

Essential equipment servicing the tunnel and supporting daily train operation, such equipment shall be installed properly and physically separated from the tunnel.

When plant room houses more than one tunnel ventilation system to serve fire mode operation, separate fire rated enclosure shall be provided to each tunnel ventilation system.



The designer of tunnel ventilation system shall be a

register professional engineer in the discipline of

building services, fire or mechanical engineering.

For the calculation of critical velocity, total heat

release rate (fire size) shall be adopted instead of

convective heat release rate.



In order to prevent re-circulation of smoke into the system via vent shaft, the smoke discharge outlets shall be separated by not less than 5m in any direction from all air inlets or other openings into any building.

The outlets shall not discharge into any means of escape nor a free air fireman’s staircase.


Tunnel Ventilation SystemSystem Configuration

The tunnel ventilation system shall be designed to prevent the hot smoke flowing from the incident tunnel to non-incident tunnel via the cross-over area and cross-wall / cross-passage door.

If there are a dedicated Means of Access (MoA) corridor and MoA / EAP staircase near the overrun tunnel / main tunnel, provisions such as smoke lobby shall be provided to prevent smoke spilling into the MoA corridor and MoA / EAP staircase.

Tunnel ventilation control panel shall be provided for tunnel ventilation systems and located adjacent to main fire control panel at Station Control Room (SCR) / Fire Control Room (FCR).


System OperationThe tunnel ventilation system with associated ductwork and

equipment shall be operated at 250°C for not less than two hours.

In case the smoke temperature is higher than 250°C, additional smoke extraction rate shall be provided to allow sufficient make-up air inside the smoke zone to be entrained and ensure the airstream temperature inside the system is less than 250°C.

Otherwise, fire rated protection with higher fire rating shall be applied to the tunnel ventilation system with associated ductwork and equipment to withstand the smoke temperature and maintain normal operation of the tunnel ventilation system.

The designer shall substantiate the smoke extraction rate and smoke temperature based on the design fire size and critical velocity.


System Operation

For parallel arrangement of tunnel ventilation fans, motorized fire and smoke dampers shall be provided at both suction side and discharge side to avoid system short circuit.

When tunnel ventilation system start under fire mode, tunnel ventilation fans shall run continuously until stopped manually.

The tunnel ventilation system shall not be controlled or under the influence of any building management or automation system.

Overall operating status of related mode of the tunnel ventilation system should be individually monitored by the affected stations.


System Reliability

Switchboard for tunnel ventilation system shall not be grouped with other services or installations.

The switchboard serves the fan/motor/drive sets of tunnel ventilation system shall be located in plant room next to fan room of tunnel ventilation fan.

The plant room shall not contain other equipment. Two dedicated electrical supplies shall be routed separately into the plant room and then connected into the switchboard for tunnel ventilation system.

When tunnel ventilation system activates under “fire mode”, all respective standby tunnel ventilation fans shall be fully utilized in case of any failure of the duty tunnel ventilation fans.

Conclusion

Higher public expectation on fire safety of railway services & align with the world’s enhanced fire safety requirements

FSD offered persistent support to new railway projects and promulgated a guidelines on fire safety requirements for new railway infrastructures

Guidelines on Formulation of Fire Safety Requirements for New Railway Infrastructures (3rd Issue) was promulgated in October 2016.

FSD will take proactive approach in elevating fire safety standards of railway development in Hong Kong.

smoke control requirements for new railway infrastructure ir...

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