Chapter 6 - Fire Alarm Systems

The fire detection system combines the simultaneous measurements of smoke, carbon monoxide, and carbon dioxide. The security of campus against intruders moving in laboratories, class rooms, staffrooms or washrooms. The fire alarm system consists of Fire detectors (with can be smoke detector, heat, or Infra-Red detectors), control unit and alarm system. A fire detection system is developed based on the simultaneous measurements of temperature and smoke. The fire detection system with the alarm algorithm detected fires that were not alarmed by smoke sensors, and alarmed in shorter times than smoke sensors operating alone. Previous fire detection algorithms used data from sensors for temperature, smoke, and combustion products. The smoke sensor alarms when the analog output signal exceeds or equal the threshold value. The node includes analog sensors to measure smoke, carbon monoxide (CO) and temperature. A fire alarm system should reliably and in a timely way notify building occupants about the presence of fire indicators, such as smoke or high temperatures.

This report provides a summary of the fire protection and life safety features for UW Medicine Lake Union, a research and laboratory building, in accordance with Seattle Building Code (SBC), International Building Code (IBC), and Life Safety Code (NFPA 101). The objective of this report is to identify if UW Medicine Lake Union meets both the prescriptive and performance based code. The primary fire safety goal is to provide life safety system that reduced the risk of fire-related injuries and loss of life due to fire. The prescriptive analysis is used to identify the building integrity per code. This evaluates the egress capacity, fire detection, fire suppression and structural fire protection. The UW Medicine Lake Union includes numerous laboratories that regularly utilize various hazardous materials. According to the literature in the Architectural drawings, the design team worked with the university does that the chemical quantities in these areas would not exceed the limits set forth in the code. With these limits in place, portions of the facility did not need to be classified as hazardous occupancy, and the special provisions associated with a hazardous occupancy. Although its spaces are used in various ways, the building was able to be classified as business occupancy. Hazardous occupancy areas were not required because hazardous materials were limited to the code-defined exempt quantities. These details helped simplify the overall life safety and egress system, while providing appropriated levels of life safety. UW Medicine Lake Union Building is high rise building with seven story research and development laboratory and two levels of below grade parking garages. It includes testing and research laboratories, laboratory support, offices and conference room. It is approximately 317,382 square feet in gross area and a building height of 109 feet. It is classified as B occupancy classification. The facility is protected throughout by automatic sprinkler and fire alarm systems. The building was constructed in 2011 in accordance with the 2009 Seattle Building Code with a Type 1A construction. See 2.6 Type and Description of Construction. The total occupant load is 2797 occupants. See Table 4: Summary of Occupant Loads. The UW Medicine Lake Union building has six (6) exit discharge. The Main and Back Entrance exit door have 72” doors; P1 (Stair 1), Retail and South exit (stair 3) door have 36” doors, and the garage exit door (stair 4) have 44” door that leads to the public way. See Figure

Performance characteristics and assessment of fire alarm system

This research work provides an in-depth analysis of the fire alarm system, considered as a security tool for a variety of facilities, from industrial buildings to residential premises. Two key subsystems serve as the basis for the study: the fire alarm system, which is designed to detect and report the occurrence of fire, and the intrusion alarm system, whose task is to detect attempts at illegal intrusion. For each of these subsystems, their functions and components are investigated, their mechanism of action, principles of operation, and possible implementation options are described, depending on the specific conditions and security requirements. At the same time, emphasis is placed on three types of automatic fire alarm systems: threshold, addressable and addressable-analog, each of which has its own features, advantages and disadvantages. The article goes beyond theoretical analysis and presents the results of a practical study of the three main types of fire alarm systems: wired, wireless and addressable. The study is based on a specially designed training stand, which allows you to simulate the operation of fire alarm systems in conditions as close to reality as possible. The article demonstrates the connection schemes of detectors, explains their states in the "normal" and "alarm" modes. It is noted that the currents and voltages of alarm loops in different modes were measured. Dependency diagrams of these parameters are presented, and the alarm threshold levels are measured. The research presented in the paper provides a valuable contribution to the study and optimization of alarm and fire systems, providing meaningful data for the development and testing of these systems. The paper can be useful for fire and security professionals and those interested in improving the performance of these systems.

The purpose of this work is to draw the attention of fire automation specialists to the issue of the lack of a methodology for assessing the probability of timely detection of a fire by automatic fire detectors. At the same time, in regulatory documents on the calculation of fire risks at protection facilities, this parameter appears under the names «probability of effective operation» and «coefficient that takes into account the compliance of the fire alarm system with the requirements of regulatory documents on fire safety». At the same time, their values are fixed without a comprehensive analysis of statistical data on the operation of fire alarm systems on fires and without taking into account the impact of the service life of automatic fire detectors included in the system on the threshold of their operation. With this approach, the calculated values of fire risk values may differ significantly from the real ones. Therefore, the issue of the correct assessment of the probability of a timely fire by automatic fire detectors, and consequently, the fire alarm system formed by them, is relevant and requires a solution. The paper proposes to assess the probability of timely detection of fires by fire alarm systems based on a detailed analysis of statistical data on their work on fires, published annually in the statistical collections of Russian scientific research institute of fire protection of EMERCOM of Russia. In order to be able to conduct a detailed analysis, it is proposed to increase the volume of statistical data provided.

Introduction. Thunderstorms in general is produced by atmospherically (climatic) processes, combined with additional hazardous effects. Thus, strong wind, flash flooding and hail causes a long time consequences including damages and injuries. Lightning protection systems are designed and projected in accordance with the requirements of the normative documents, which not always included measures of personal safety and guaranteed absences of injuries. Improving the state of life safety and loss prevention are based on standards and rules, which depend on the results of risk assessment, and investigation of cause’s events.
 Purpose. The purpose of this article is to analyze this problem in several areas concerning the situation with a systematic approach to the technical regulation in Ukraine of such a sector of life safety as the lightning protection.
 Methods. Methods of research: calculations using a mathematical model; comparison of the results of the calculation, forecasting of the boundary parameters of the technical condition and monitoring of the lightning location systems properties; examination, qualification, definition of indicators of lightning location system in the composition of the geographical informational system, taking into account laying conditions. Also comparison of different methods for calculating positioning coordinates is given.
 Results. One of the components of the system lightning protection - the parameters of positioning coordinates of the lightning location system is investigated. The location of lightning strike points is not specified in the applicable fire safety regulations, although this criterion is often used precisely to set fire safety requirements: for buildings, utilities, fire alarm systems, and more.
 Measures are proposed for implementing test methods and means and incorporating them into standardized technical solutions. In this respect, there can be no claim to the International Electrotechnical Commission and its publications. It is suggested to take into account a number of identified gaps in regulatory documents, relationships between regulators and supervisors, user requests. The analysis of the current normative and technical requirements for the accuracy of coordinates positioning in lightning location systems. On this basis, methods of investigating the causes of events are supplemented, which simplifies the application of impact analysis and the development of protective measures.
 Conclusion. Determination of the positioning coordinates of lightning stroke is not regulated in the current normative documents on fire safety, although this criterion is often used precisely when establishing requirements for fire safety: to buildings, cable installations, to the installation of fire automatics systems and to others. It is proposed to take advantage of the accuracy in determining the location using mapping geoinformation systems and services in the analysis of indicators of the system of thrust. Conducted theoretical studies of indicators of the lightning location systems have established their relevance for risk assessment methods, measures to prevent losses and to investigate the causes of death, injury to living creatures and other property damage events.

In this thesis, the research are implemented to build a complete radio directional finding (RDF) and fire alarm systems. These architecture of Radio Directional Finding and fire alarm systems were composed of PIC18LF4520 microcontroller and RF transceiver module. The RFIC(CC1101) embedded in the RF transceiver module is equipped with the ability to dynamically update the content of the internal build received signal strength indicator(RSSI). This dissertation is divided into two sections. First section is Radio Directional Finding system bring about two phases. The first phase is the data communications are properly set through the 4-wire serial peripheral interfaces(SPI) through the PIC18LF4520 microcontrollers with 433MHz RF transceiver modules to complete wireless transmission ; in the second phase, the radio directional finding (RDF) system is integration of PIC18LF4520 microcontroller, RF transceiver modules and antenna make the system with integrity. The research conducted in this thesis integrated not only hardware but also firmware. This system uses the C language constructs program and microstrip antenna to replace the original omnidirectional antenna at the receiver. Finally, we determine the transmitter location through RF transceiver modules of the received signal strength indicator(RSSI) characteristics. The second section is fire alarm system. Digital thermometer installed in the transmitter. When the thermometer sensed data threshold is reached. The alarm system will be activated immediately. This system is intended to notify the building occupants to evacuate in the event of a fire.

Background: Fire is one of the potential dangers that threatens human activities more and more. Given that, this study sought to introduce the factors preventing the spread of fire in hospitals to policymakers through prioritization based on the techniques of applied mathematics (multi-attribute decision-making technique).
 Methods: This study consisted of two stages. In the first stage, through a comprehensive review of studies, factors preventing the spread of fire were identified, and then in the second stage, based on the experts’ opinions, the attributes affecting the prioritization and their weights were determined. Finally, based on the Simple Additive Weighting (SAW) model, the final prioritization was done for five types of hospital buildings.
 Results: Based on the literature review and experts’ opinions, seven factors and four attributes were identified. The most important factors were “the use of safety architecture and equipping with appropriate emergency exit accesses according to the standard” in highrise hospitals, “continuous firefighting training of the personnel” in wide hospitals, “use of fire extinguishing systems (automatic and manual)” in subsurface hospitals, “use of fire extinguishing systems (automatic and manual)” in combined hospitals, and “continuous firefighting training of the personnel” in portable hospitals.
 Conclusions: Fire safety is not limited to the installation of a manual fire extinguisher, but for fire safety, especially in hospitals, all aspects should be considered, including the architectural form of the building, how the materials and equipment in the building caught fire, fire behavior in terms of heat transfer, the firefighting training of the personnel, recognition, and application of modern and ready-made equipment for smoke ventilation systems and fire products, automatic and manual fire alarm systems, and extinguishing systems to prevent the spread of fire.

Many countries use conventional fire alarm control panels (FACPs) and conventional detectors as fire alarm systems (FASs) because of economic advantages. This study analyzes several problems with conventional FASs and describes an advanced FAS, the traceable FAS, that we developed to solve these problems. The traceable FAS can trace the exact location of a fire, can detect multiple fires that occur simultaneously, and can be used with conventional detectors without disrupting the other detectors operation. The traceable FAS consists of a traceable FACP based on the conventional FACP and a traceable heat detector based on the rate-of-rise spot-type conventional heat detector. The new system offers traceability in addition to all the features of the conventional FAS. The traceable FACP has 40 zones; one zone can connect up to 20 traceable heat detectors. Thus, this FACP can connect up to 800 traceable heat detectors, all of which can detect and trace exact fire locations in sequence. Furthermore, the traceable FACP can be used with both traceable heat detectors and conventional heat detectors in the same zone. Even if one detector (either traceable heat detector or conventional heat detector) detects a fire first, other traceable heat detectors in the same zone can also detect it and display the results on the traceable FACP. Prototypes of the traceable FACP and traceable heat detector (rate-of-rise spot-type) have officially received model approvals for use in South Korea. Conventional FASs can be upgraded to traceable FASs simply by changing to the traceable FACP and traceable heat detectors, without any rewiring.

Background: Fire safety is one of the most important issues in high-rise buildings. The purpose of this study is to assess maximum possible loss in the fire in Central Insurance Building of Islamic Republic of Iran using the layer of protection analysis (LOPA) method.
 Method: In 2017, this analytical study was conducted on the 21-floor building of the Central Insurance in Iran. To identify the hazard sources and assess the maximum possible loss, the authors used the preliminary hazard list (PHL) and layer of protection analysis (LOPA) respectively. In addition, the analysis of the study data was performed based on the 10×10 risk assessment matrix.
 Results: The results of the PHL showed that 26 hazardous conditions and four major sources including structural engineering, fire alarm systems and fire extinguishers, design and maintenance of building safety, and behavioral habits were identified as main hazards of fire in the studied building. The application of the LOPA method showed that highest risk level was associated with the fire caused by the exhaust heat from the engine room (RL=48) and the emergency power generator diesel (RL=40), respectively.
 Conclusion: The findings of this study indicated that calculating the maximum possible loss in the fire of high-rise buildings can help to increase the safety factor. Moreover, the use of the two methods, PHL and LOPA, can be useful in these types of risk assessments.

Fire can really be devastating to properties if improperly managed, it is due to this problem that the fire detection and alarm systems were sought for. However, traditional fire alarm system is based on a wiring network which have drawbacks and limitations such as inflexibility of the FDAS layout plan during building construction, and difficulties in renovation where the removal and relocation of traditional FDAS requires additional amount of work. To address these problems, a fire detection and alarm system that is based on wireless sensor network was developed. The FDAS is mainly composed of a fire detection node, a fire alarm node, and a fire alarm control panel. The wireless communication of the nodes was achieved using XBee as the wireless transceiver. The significant characteristic of XBee is the mesh routing protocol which helps the system to be more robust and flexible. The fire alarm control panel is a LabVIEW based program that utilizes the state machine architecture which follows the detect-evaluate-store algorithm. In evaluating the overall system, results illustrate the network of nodes adapts to its location and connects to other nodes whenever it is within their range. Furthermore, the average response time of each detection node with respect to the fire alarm control panel is below the standard of 10-second as stated by the National Fire Alarm and Signaling Code.

This paper describes a comprehensive program of an office building intelligent systems Fire Control Linkage System subsystem design, At the same time, it describes the following: the idea of the system designing, the system components, selecting equipment, the linkage of alarming and controlling gas extinguishing, and the technical features. Projects under this program have been completed, can realize the intelligent prediction of fire, automatic fire alarm and linkage functions.

This paper puts forward a strategy of intellectualized fire monitor based on embedded system in terms of problems arising from fire reporting. The monitor is intended to monitor the fire automatic alarm system, realize remote communication between the fire automatic alarm system and the administration center, receive directives from the center, and connect the center through audio and visual means, thereby effectively solving the existing problems in the fire monitoring. In addition, the paper can be instructive for other remote data transmission system or unwatched systems. The paper is intended to briefly introduce the design on the application of multi-thread embedded software development technology in intellectualized fire monitoring terminal at the same time.

All safety measures have costs and benefits associated to them. A social cost-benefit analysis (SCBA) therefore ideally is a part of fire safety policy decision-making. This chapter introduces the concept of SCBA and its constituting elements. A CBA case study on automatic fire alarm systems is presented to show how an SCBA can be computed. In this case study, the safety benefits of these systems do not outweigh the costs. The SCBA was basis for a policy decision to limit the number of objects for which an automatic fire alarm system is obligatory. Part of the input for any SCBA is insight into the value that the public attributes to aspects such as the presence of the fire service or the value of lives saved by fire safety measures. For the aspect of ‘lives saved’ in the context of fire safety, an estimate of the value of a statistical life (VOSL) is relevant. Not much research has been done to get insight into these values specifically for fire safety. We report on the outcome of an experiment to obtain these values in the Dutch context. Interesting enough, the fire VOSL was found to be a magnitude higher than the road safety VOSL.

Fire alarm systems are an important part of the safety concept in complex buildings. For this reason, there are high availability requirements for the systems, which must be sustained by a maintenance concept. A shortage of skilled workers and rising costs in the construction and operation of buildings are pushing these concepts ever further. This study deals with proposed changes to the maintenance strategies to achieve cost and time savings in addition to an improvement in quality. As a first part of the work, the current state of research on developments in fire alarm systems and their maintenance and inspection concepts is analyzed within a literature review. The results serve as a basis for further research, which is based on a qualitative content analysis of expert interviews and standardized surveys to identify the weaknesses in current inspection strategies and future factors influencing the methods and technology of inspections through technical innovations. As a data basis for this study, expert interviews were conducted with experts from manufacturers, industry associations, and standards bodies in order to determine the possible influencing factors. To determine their relevance for the inspection, more than 40 experts were surveyed about testing the systems. The presented results show that new technical risks, such as cyber threats and networked plant structures, are insufficiently covered by current inspection strategies. Furthermore, inspection steps can be substituted by new technologies. The most important influencing factors that can be identified here are automatic self-test functions of components and remote inspection techniques of the systems. Finally, the results are discussed within the framework of a PESTEL analysis. In conclusion, it can be stated that the integration of identified impacts in future inspection strategies brings time and efficiency benefits in the operation of systems.