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Содержание VESDA

Страница 1: ...Vision Fire Security Refrigerated Storage Design Guide March 2006 i ...

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Страница 3: ...tute or with prior written consent of Vision Fire Security Pty Ltd Copyright 2006 Vision Fire Security Pty Ltd ABN 25 008 009 514 Disclaimer The manufacturer reserves the right to change designs or specifications without obligation and without further notice VESDA LaserTEKNIC LaserPLUS LaserSCANNER LaserCOMPACT LaserFOCUS VESDAnet VESDAlink ASPIRE ASPIRE2 AutoLearn VSM PSM VConfig InfoWORKS PROACT...

Страница 4: ...Refrigerated Storage Design Guide VESDA ii ...

Страница 5: ...n 8 3 6 In rack Protection 9 3 7 Ceiling Void Protection 9 3 8 Other Areas To Be Protected 10 4 Preventing Condensation And Crystallization 10 4 1 The Effects Of A Temperature Drop 10 4 2 Condensation On The Sample Pipe Outer Surface 10 4 3 Crystallization On The Sample Pipe Outer Surface 11 4 4 Condensation Inside Sample Pipes 11 4 5 Crystallization Inside Sample Pipes 12 5 Installation Considera...

Страница 6: ...Refrigerated Storage Design Guide VESDA iv ...

Страница 7: ...unction with specific local fire codes and standards Other regional industry practices where applicable should also be adhered to 1 2 Quick Reference The key design considerations presented in Table 1 are an overview only They should be used in conjunction with the remainder of the information presented in this Design Guide and in the relevant VESDA System Design Guide 2 Table 1 Key design conside...

Страница 8: ...t equipment Electrical equipment wiring and other equipment housed in the roof space The lighting system Hot spots resulting from maintenance operations Discarded cigarette butts Arson Due to the large amounts of plastic present in this type of facility in the form of packaging materials a fire would produce large amounts of highly toxic and corrosive smoke which would damage assets and endanger p...

Страница 9: ...e safety assessments of the environmental risks and performance requirements specific to the particular refrigerated storage facility are also conducted as part of the design process Standard risk management concepts like those listed below are also often used for refrigerated storage facility assessment AS NZS 4360 1999 7 SFPE Handbook Third Edition 2002 8 Note The SFPE Code Officials Guide to Pe...

Страница 10: ...earlier a fire can be detected the better The perishable nature of the goods commonly stored in freezers or coolers makes it essential that any rise in temperature be avoided Heat from a fire or a rise in temperature due to refrigeration system down time following a fire would both result in stock spoilage and hence loss of revenue Even an incipient fire in this type of environment can lead to sig...

Страница 11: ...E 80 50 to 60 C 58 to 140 F 20 mm per 10 m per 10 C 0 79 per 32 8 ft per 18 C Above 50 C 58 F PE 100 50 to 60 C 58 to 140 F 13 mm per 10 m per 10 C 0 52 per 32 8 ft per 18 F Above 50 C 58 F An added advantage of using a continuous semi flexible pipe material such as HDPE 14 is the reduction in the number of pipe junctions required 3 2 Positioning Pipes And Sample Holes The various international co...

Страница 12: ...hown above Figure 1 there are two alternative approaches to pipe network configuration design for optimal air sampling performance 1 The pipes can be run along the ceiling inside the area to be protected as shown Figure 2 This technique minimizes the number of pipe penetrations through the walls or ceiling and can be applied in most practical situations Sample holes MUST be drilled after installat...

Страница 13: ...nsulation has a temperature range of 40 C 40 F to 105 C 221 F a density of 88 to 105 kg m3 and is very flexible For a 25 mm 0 98 internal bore pipe a single layer of insulation 9 mm 0 35 thick is adequate 3 4 Sealing Sample Pipe Penetrations Pipe penetrations through ceiling or wall insulation panels MUST be properly sealed with a solid Urethane foam and or flexible mastic material To enhance air ...

Страница 14: ...e network is installed before the refrigerators are turned on For example according to its thermal expansion coefficient an ABS pipe will contract by 0 1 for every 10 C 50 F drop in temperature This equates to a 40 mm 1 57 inch reduction in length for a 40 m 131 2 ft pipe and will result in disconnection of pipe sections in cases where the pipes were installed in temperatures well above the intend...

Страница 15: ...ng the racks used for storage in the refrigerated area as shown below Figure 6 Figure 6 Example of in rack air sampling Wherever possible the in rack sample pipe should enter the protected area through the wall at the height that the pipe will be positioned in the rack Note Capillary air sampling is not recommended for in rack sampling 3 7 Ceiling Void Protection Very early smoke detection is esse...

Страница 16: ...cur if the sampled air is cooled as it passes along the pipe through an area of lower temperature than that from which the air was sampled On the outer surface of pipes condensation is expected and can be tolerated During system design all areas to be protected must be categorised according to the criteria listed below The temperature and humidity changes that will occur if the function of the pro...

Страница 17: ... Example of ice formation on sample pipes close to the refrigerator entrance 4 4 Condensation Inside Sample Pipes Condensation inside sample pipes outside the protected area is rare However it can occur if the function of the protected area changes and or as a result of seasonal temperature variations For example if a chiller 9 C 16 F is converted to a cooler 8 C 46 F condensation may form inside ...

Страница 18: ...ly the top is a good design the bottom is not Important Note Pipes MUST NOT run from a high temperature area into a lower temperature area Separate VESDA detectors should be installed in the chiller cooler ceiling void and office areas 5 Installation Considerations 5 1 Sampled Air Warming For optimum detection and ease of maintenance access the VESDA detector MUST be installed in a location where ...

Страница 19: ...h ft 20 l min 30 l min 40 l min Figure 11 Chart showing the estimated required ABS pipe extension for sampled air warming 0 1 2 3 4 5 6 40 40 30 22 20 4 10 14 0 32 10 50 Sampled Air Temperature deg C F Cu Pipe Length m 0 4 8 12 16 20 Cu Pipe Length ft 20 l min 30 l min 40 l min Figure 12 Chart showing the estimated required Copper pipe extension for sampled air warming 13 ...

Страница 20: ...approach to warming sampled air is NOT recommended by Vision Fire Security as it has not been validated by Factory Mutual FM Important Note The Appendix contains information on the copper pipe and heat tape lengths required for sampled air warming No design guidelines will be given here If wishing to use heat tracing appropriately qualified Engineers MUST be consulted as to the most suitable metho...

Страница 21: ...ow Figure 15 Figure 15 Example of a water trap To install a water trap a T section of pipe must be fitted to the pipe entering the inverted detector Water will pool at the stop valve on the downwards pointing arm of the T The transparent section of pipe allows maintenance personnel to see when water is building up before it rises above the intersection with the main sampling pipe and release it vi...

Страница 22: ...prinkler heads on the ceiling 3 Set the VESDA Alert alarm threshold for early detection and intervention 4 Set the VESDA Fire 1 alarm threshold for pre action sprinkler activation as indicated in Table 4 Note Delays can be configured for both of these alarms The smoke thresholds in Table 4 are absolute values hence the environmental background level must be taken into account All values are recomm...

Страница 23: ... secondary power supply MUST be available This power supply needs to be capable of running a single VESDA detector for a total of 90 hours This is in compliance with the fact that approved control panels for the automatic release of pre action or deluge sprinkler systems must have 90 hours of standby power plus 10 minutes worth of power to operate the sprinkler system and alarms 17 Where the VESDA...

Страница 24: ...Times should be applied conservatively Smoke tests can then be used to check system performance for both smoke detection and pre action suppression activation 6 3 Service And Maintenance The VESDA system shall be serviced and maintained according to both the local codes and standards and the instructions provided in the Maintenance section of the VESDA System Design Manual 2 The frequency of sampl...

Страница 25: ...nsulated Figure 17 Example of heat tracing with heat tape Raychem heat tape 5BTV2 CT or 3BTV1 CR can be used The following charts provide estimates of copper pipe and heat tape lengths required for heat tracing Variations in ambient temperature are assumed to be negligible due to pipe insulation The surface of the pipe is kept at a temperature of 35 C 95 F and the tape is wound around it at 100 mm...

Страница 26: ...orage Design Guide VESDA 0 1 2 3 40 40 30 22 20 4 10 14 0 32 10 50 Sampled Air Temperature deg C F Heat Tape Length m 0 2 4 6 8 10 Heat Tape Length ft 20 l min 30 l min 40 l min Figure 19 Estimated heat tape length 20 ...

Страница 27: ...and Design of Buildings 7 Australian Standard AS NZS 4360 1999 Risk Management Standard 8 SFPE 2002 Handbook of Fire Protection Engineering 3rd Edition 9 SFPE ICC 2004 The Code Officials Guide To Performance Based Design Review 10 NFPA 2002 National Fire Alarm Code 72 11 The Plastics Pipe Institute Inc 1999 Suggested Temperature Limitations for the Operation and Installation of Thermoplastic Pipes...

Страница 28: ... any statutory or any other competent authority in respect of or affecting the recommendation on system design in any jurisdiction in which it may be implemented VFS products must only be installed configured and used strictly in accordance with the General Terms and Conditions and the technical documentation available from VFS VFS accepts no liability for the performance of the recommendation on ...

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