TCVN 7336-2003 Fire Protection Automatic Sprinkler System(en)
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Fire Protection Automatic Sprinkler Systems Design and Installation Requirements 1 Scope of application
This Standard specifies requirements for design and installation of automatic fire-fighting sprinkler systems with water and foam (hereinafter called as sprinkler system) in new or refurbished construction buildings. This Standard is also applied for sprinkler-control drencher systems, fire-detectors, automatic controls or manual controls. This Standard is not applied for fire-fighting systems for: Buildings with special functions and engineering equipment outside such buildings. Underground chambers of mine-ores industry Warehouses with commodities piled up on shelves higher than 5.5m. Fuel tanks
2. Extracted standards TCVN 4756-89 TCVN 5738:2001 Norms of electric equipment grounding and airing. Automatic fire-alarming system Technical requirements
TCVN 6305-1:1997 (ISO 6182-1:1993) Fire fighting and protection Automatic sprinkler system Section 1: Requirements and testing methods for sprinklers TCVN 6305-2:1997 (ISO 6182-2:1993) Fire fighting and protection Automatic sprinkler systems Section 2: Requirements and testing methods for wet-typed alarm valves, stoppage chamber and water-type alarm mechanisms. TCVN 6305-3:1997 (ISO 6182-3:1993) Fire fighting and protection Automatic sprinkler system Section 3: Requirements and testing methods for dry pipe valves. TCVN 7336 : 2003 This Standard TCVN 6305-4:1997 (ISO 6182-4:1993) Fire fighting and protection Automatic sprinkler system Section 3: Requirements and testing methods for quick open valve mechanism. TCVN 6305-5:1997 (ISO 6182-5:1993) Fire fighting and protection Automatic sprinkler system Section 3: Requirements and testing methods for overflow valves.
3 Terminology and definitions This Standard applies the terminology and definitions in TCVN 6305:1997 4 General regulations
4.1 The fire-fighting systems designed according to this Standard shall have manual control. 4.2 The sprinkler system shall be so designed that they can perform both fire-fighting function and automatic fire-alarming function. 4.3 The sprinkler systems shall be designed on the technical basis of the production line which requires protection and economic-technical norms. 5 Classification of sprinkler system and design data
5.1 System classification The sprinkler system is classified on the basis of fire-incur risk rate at the building facility and called accordingly (see 5.2) as follows: System for low fire-rate building System for average fire-rate building System for high fire-rate building
5.2 Building classification according to fire rates The building classification according to fire rates is stipulated in Appendix A. Appendix A is not a complete list. When designing a building protection sprinkler system which is not included in Appendix A, such building shall be converted to another listed item which during fire situations similar status is shown. However, this should be confirmed by an authority prior to designing sprinkler system. 5.2 Types of systems Types of sprinkler systems stipulated in this Standard are standard sprinkler systems and drencher systems. 5.3.1 Standard sprinkler system
The standard sprinkler systems comprise the following: 2
Wet pipework Alternately wet and dry pipework Either wet pipework or alternately wet & dry pipework, combined with the ending part of dry pipework system. Wet pipework combined with ending part of alternate wet & dry pipework system. Dry pipework.
220.127.116.11 Wet pipework system Wet pipework system is a standard sprinkler system which is frequently filled with water, having pressure at both upper and lower sides of the wet pipework alarm valve. The wet pipework system shall be installed in buildings where there are no risks of water getting frozen in the pipes. If this condition is not ensured everywhere in the building, then at the locations where freeze may occur it is possible to combine the wet pipework with the ending part of the alternate wet & dry pipework, on the condition that the number of sprinklers therein shall not exceed the limits stated in 18.104.22.168, otherwise the whole system installation shall be proceeded as the alternate dry & wet pipework. The sprinkler in wet pipework can be installed either upwards or downwards. The wet pipework shall be designed in such a manner that the number of sprinklers controlled by a valve (including the taps at the extended ending part) shall not exceed following numbers: a) for low fire-rate buildings: 500 b) for average and high fire rate buildings (including any sprinklers of low fire rate system) 1000 When calculating the number of sprinklers in a mixed system including area with low fire rates, average fire rates and/or high fire rates, the actual number of sprinklers in low fire rate area shall be doubled. This quantity shall be added to the number of ejectors in average fire-rate area and/or high fire-rate area and total number of sprinklers shall not exceed 1000. For instance, in a system with 600 sprinklers for an average fire-rate area and 200 sprinklers for a low fire-rate area, i.e 800 sprinklers in total, then the number of sprinklers taken as above required shall be 1000, i.e. 600 + (200 x 2). Note: Number of sprinklers in confined areas, inside machinery or in similar areas can be ignored when calculating total number of sprinklers for wet pipework system. 22.214.171.124 Alternate dry & wet pipework An alternate wet & dry pipework is a standard sprinkler system, including a mixed alarming valve or a combination including wet pipework alarm valve and dry pipework alarm valve, of which: In winter months, in cold areas where water in pipework can be frozen, the pipework above the mixed alarm valve or dry pipework alarm valve shall be fed with compressed air, while the remaining part of the system below the valve is fed with water under pressure; and In other time periods of the year, the system shall work as a wet pipework system as describe in 126.96.36.199
The sprinklers shall be installed upwards on the straight line of the pipes in the alternate dry & wet pipework. This regulation allows exceptions when installing dry pipework sprinklers downwards with oriented jets or when installing downward standards sprinklers accompanied with approved anti-freezing component. The pipework shall be installed with suitable gradient to drain water (see 8.13). The alternate dry & wet pipework shall be so designed that the maximum number of sprinklers controlled by a valve, including the sprinklers at the extension ending part (see 188.8.131.52) conform to rules in Table 1. Table 1 Number of sprinklers for alternate dry & wet pipework Condition With speeder or suction fan Without speeder or suction fan System with low fire-rate * 250 125 System with average and/or high fire-rate** 500 250
* For example, in a system with 300 sprinklers for an average fire-rate area and 100 for a low fire-rate area, the number of sprinklers, according to this standard, instead of being 400, must be 500, i.e. 300 + (100 x 2). ** When calculating the number of sprinklers in a mixed system, the actual number of sprinklers in a low fire-rate area shall be doubled.. This quantity shall be added to the number of sprinklers in average and/or high fire-rate areas and the total number of sprinklers shall not exceed the number in Column 3.
184.108.40.206 Dry pipework system A dry pipework system is a standard sprinkler system in which the pipework is frequently filled with compressed air above the dry pipework alarm valve and filled with water under pressure below this valve. Normally, the dry pipework system is only allowed to be installed in the buildings where temperature condition is maintained as or lower than the freezing temperature of water as in freezers, animal fur warehouse or at the locations where temperature is maintained over 70oC as in ovens. When installing dry pipework in other special circumstances, particular license is required. The number of sprinklers controlled by one valve in dry pipework shall not exceed the quantity sated in Table 1 for alternate dry & wet pipework. The sprinklers shall be installed upwards above the pipes of dry pipework system, except when the downward sprinklers with oriented jets (see 6.7) are designated for installation or when the standard downward sprinklers are installed with approved anti-freezing component. The pipework shall be installed with suitable gradient to drain water (see 8.13).4
220.127.116.11 Ending section of an alternate dry & wet pipework or dry pipework These systems in general are similar to the systems described in 18.104.22.168, 22.214.171.124. and 126.96.36.199. except when they are in relatively small size and forming an extended section for a standard sprinkler system. These systems are allowed as follows: (a) as an extended section for wet pipework in: relatively small areas where freezing may occur in the buildings which are suitably heated. In such case the extended system shall be type of alternate dry & wet system; and drying rooms and ovens at high temperature. In such case the extended system shall be type of dry one.
(b) as an extension for the alternate dry & wet pipework in those ovens or stoves at high temperature, when the extended pipework operates according to dry pipework principle. The sprinklers shall be installed upwards above the pipes in the extended system, except when the downward sprinklers with oriented jets (see 6.7) are designated for installation or when the standard downward sprinklers are installed with approved anti-freezing component. The number of spr