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20s206 automatic sprinkler installation pdf

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Water supply standard atlas
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Brief introduction: Scope of application of 20s206 automatic sprinkler installation 3 this atlas is applicable to the selection and installation of automatic sprinkler system components in new, expanded and rebuilt civil and industrial buildings. This atlas is not applicable to the selection and installation of automatic sprinkler system components in special functional buildings such as gunpowder, explosive, ammunition, initiating explosive device factory, nuclear power plant and aircraft hangar. The main contents of this atlas include the selection and installation of main components in automatic sprinkler system, such as schematic diagram of sprinkler system, alarm valve, sprinkler head, layout of foam tank, pressure reducing facilities, filter, water flow indicator, end water test, exhaust valve, pipeline, etc. 5. Selection and installation of 5.1 alarm valve group. 5.1.1 the automatic sprinkler system shall be equipped with alarm valve group. 5.1.2 the elevation difference between the highest and lowest position of each alarm valve group should not be greater than 50m. 5.1.3 the alarm valve group should be set in a safe and easy to operate place. The indoor floor where the alarm valve group is installed should have drainage facilities. The drainage capacity should meet the requirements of the alarm valve debugging, acceptance and the use of water test valve to vent the system pipeline. 5.1.4 the installation of alarm valve group shall be carried out after the pressure test and flushing of water supply pipe network are qualified. The installation shall be carried out in the order of control valve, alarm valve and alarm valve accessories. 5.1.5 the control valve connecting the inlet and outlet of alarm valve shall adopt signal valve. When the signal valve is not used, the control valve shall be equipped with a lock to lock the valve position. 5.1.6 filter shall be set at the inlet of solenoid valve of deluge alarm valve group. For the deluge alarm valve group set in parallel in the deluge system, a check valve shall be set at the inlet of the deluge alarm valve control chamber. 5.1.7 the height of the alarm valve from the ground should be 1.2m; The distance between the front and the wall should not be less than 1.2m; The distance between the two sides and the wall shall not be less than 0.5m; The distance between the protruding parts of alarm valve group shall not be less than 0.5m. 5.1.8 the hydraulic alarm bell shall be installed near the attended place or on the external wall of the public passage. 5.1.9 the diameter of the pipe connecting the hydraulic alarm bell and the alarm valve shall be DN20, and the total length of the pipeline shall not be more than 20m, and the hot-dip pot steel pipes with inner and outer walls shall be adopted. 5.1.10 the sound intensity of the alarm bell 3 m away from the hydraulic alarm shall not be less than 70. 5.2 nozzle. 5.2.1 the nominal operating temperature of sprinkler head of closed system should be higher than the maximum ambient temperature of 300C. 5.2.2 the automatic sprinkler system shall be equipped with spare sprinkler heads, the number of which shall not be less than 1% of the total number, and each model shall not be less than 10. 5.2.3 sprinkler heads with the same thermal performance shall be used in the same compartment. 5.2.4 nozzle installation must be carried out after the system pressure test and flushing are qualified. 5.2.5 special spanner shall be used for nozzle installation, and it is strictly prohibited to use the frame of sprinkler head for screwing. 5.2.6 when the frame and splash tray of the nozzle are deformed or the original parts are damaged, the sprinkler head with the same specification and model shall be replaced. 5.3 foam liquid storage tank. 5.3.1 the foam concentrate storage tank should be made of corrosion-resistant materials, and the inner wall or lining directly in contact with the foam concentrate shall not have adverse effect on the performance of the foam concentrate. 5.3.2 no less than 0.7m wide maintenance channel shall be reserved around the foam liquid storage tank, and the operation surface shall not be less than 1 Clumsy. 5.3.3 during the installation of foam liquid storage tank, the paper frame shall be firmly fixed with the foundation; The outlet of the safety valve of the storage tank shall not face the operation surface. 5.4 flow indicator. 5.4.1 except that the sprinkler controlled by the alarm valve group only protects the places on the same floor which does not exceed the fire compartment area, each fire compartment and each floor shall be equipped with water flow indicator. 5.4.2 water flow indicator shall be set for sprinkler under the roof of warehouse and the sprinkler inside shelf. 5.4.3 when the control valve is set in front of the inlet of the water flow indicator, the signal barrier should be used. The signal valve shall be installed on the water inlet side of the water flow indicator, and the distance between the signal valve and the water flow indicator shall not be less than 300 mm. 5.4.4 the water flow indicator can be installed only after the pipeline pressure test and flushing are qualified. 5.4.5 the electrical components of the water flow indicator shall be installed vertically on the upper side of the horizontal pipe, and its action direction shall be consistent with the water flow direction; After installation, the slurry and diaphragm of the water flow indicator shall be flexible and shall not collide with the pipe wall. 5.5 decompression facilities. 5.5.1 the section that controls the static pressure of the pipeline should be provided with water supply or pressure reducing valve, and the section that controls the dynamic pressure of the pipeline should be equipped with pressure reducing orifice or throttling pipe. 5.5.2 the decompression orifice plate shall be made of stainless steel plate, and shall be set on the horizontal straight pipe section with the diameter of no less than 50 mm. The length of the front and rear pipe sections shall not be less than 5 times of the diameter of the pipe section. The diameter of the orifice shall not be less than 30% of the diameter of the set pipe section and shall not be less than 20 mm. 5.5.3 the diameter of the throttling pipe should be 1 / 2 of the upstream pipe diameter, and the length should not be less than 1m. The average flow rate of water in the throttling pipe should not be greater than 20m / s. 5.6 filter. 5.6.1 filter shall be set at the inlet of pressure reducing valve; When the non anticorrosive steel pipe is used in the pipeline before the alarm valve inlet, a filter shall be set in front of the alarm valve. 5.6.2 the control valve shall be set before the filter. 5.6.3 the mesh diameter of the filter should not be less than 4 mesh / cm2-5 mesh / cm2, and the flow area should not be less than 4 times of the cross-sectional area of the pipeline. 5.7 exhaust valve. 5.7.1 the water distribution pipeline of dry system and pre action system shall be equipped with quick exhaust valve. An electric valve should be set before the inlet of the quick exhaust valve of the pressurized inflation pipe. 5.7.2 automatic exhaust valve should be set at the highest point of wet system pipeline.
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