A study of interfacing fire services system with other E&M systems in public transport facilities

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A study of interfacing fire services system with other E&M systems in public transport facilities


Author: Wong, Yan-chung
Title: A study of interfacing fire services system with other E&M systems in public transport facilities
Degree: M.Sc.
Year: 2002
Subject: Hong Kong Polytechnic University -- Dissertations
Public utilities -- China -- Hong Kong -- Fires and fire prevention
Fire prevention -- China -- Hong Kong
Local transit -- China -- Hong Kong -- Fires and fire prevention
Department: Multi-disciplinary Studies
Dept. of Building Services Engineering
Pages: ix, 90, [46] leaves : ill. ; 30 cm
Language: English
InnoPac Record: http://library.polyu.edu.hk/record=b1661043
URI: http://theses.lib.polyu.edu.hk/handle/200/3227
Abstract: As the scope and complexity of fire alarm and detection systems become more and more intelligent and sophisticated, there are more and more specialists (both designers and contractors) being involved in the public utilities infrastructure projects. Consequently, the success of implementation of the fire service systems in meeting with the requirements as stated in the respective Fire Safety Strategy becomes very much on how the fire service system to be integrated with the others Electrical and Mechanical Systems. This in turn relies on the appropriate assessment on the system configuration, system compatibility with other Electrical and Mechanical systems and risk management. Normally, most of the infrastructure projects have established a fire safety strategy to govern the design of fire safety requirements. It is because the prescriptive fire codes cannot fully cover the application of the public transport utilities. Therefore a fire safety strategy can set out the baseline of the fire services interface requirements with the other Electrical and Mechanical sub-systems. In addition, by introducing the fire safety engineering approach, the fire safety design can be tailored-made to cope with different operational needs and constraints of each individual infrastructure projects. To evaluate the fire services interfaces of a given fire safety design, two case studies on the public transport utilities were studied. As there were lots of aspects that can be focused on, a simple analysis on probabilities of fire alarm failures and detection system failures were conducted. The result was found that different fire alarm and detection system configurations would have different failure probabilities due to the lost of fire service interface. In other words, the fire safety engineers should take the concept of integrated system into account when they are designing the fire service systems and how the integrated system would meet with the fire safety strategy. When dealing with the integrated system, BS 7807 (1995), Code of Practice for Design, Installation and Servicing of Integrated Systems Incorporating Fire Detection and Alarm Systems and/or other Security Systems for Buildings provided a basic guidelines for the fire safety engineers. In BS 7807 (1995), it was recommended that the following aspects should be considered during the design stage. Firstly, responsibilities of users in system supervision, tests, logging, maintenance and upgrade and modification should be probably defined. Then the concept of Quantified Risk Assessment (QRA) is suggested to evaluate the probabilities of system failure in different system configuration. Following the QRA, the type of information given in an integrated system, together with its formal presentation, is dependent upon the needs of the system's users. Any additional power requirements from other system functions should not reduce the stand-by period below the specified minimum requirement. Careful consideration should be given to shared control facilities associated with common display systems, whereas the system control facilities should be ease of use and reliable. Finally, users or design engineers should pay attention to various areas such as software / data identification and protection, self-checking and program monitoring, housekeeping of modifiable configuration data and secure running data, structural and documented software design process and controlled transmission of data to increase the reliability of fire services systems.

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