Part 3 Fire Safety Equipments
Chapter 1 Fire Extinguishing Equipments
Section 6 Carbon Dioxide Fire Extinguishing Equipments
Any of the following spraying patterns may be selected for carbon dioxide fire extinguishing equipments pursuant to the actual circumstance:
1.Total flooding: in areas separated by wall, column, floorslabs or ceiling made of inflammable materials, quantity and location of nozzle and spraying amount shall be able to ensure effective fire extinguishing pursuant to the cubage of the area and the characteristics of the protected object. The opening shall be equipped with automatic closing device unless the leakage at the opening can be made up effectively.
2.Local application: nozzles shall be equipped pursuant to the shape, construction, quantity and property of the protected objects, and the number, location and spraying volume of nozzles shall be able to ensure effective fire extinguishing.
3.Moveable application: the horizontal distance from leather pipe connector to any part of the protected object is not more than 15m.
Carbon dioxide fire extinguishing equipments shall be equipped pursuant to the following provisions:
1.Necessary quantity of fire extinguishing medium for total flooding shall be calculated following the table below:
│ Place │Telecommunica-│ Others │
│ │tion machine ├───┬───┬───┬───┤
│ │room, telepho-│<50m3│50m3≦ │150m3 │≧1500│
│ │ne exchanger │ │C<150 │≦C< │m3 │
│ │room │ │m3 │1500m3│ │
│Quantity of │ 1.2 │ 1.0 │ 0.9 │ 0.8 │ 0.75│
│Fire extin- │ │ │ │ │ │
│guishing │ │ │ │ │ │
│medium for │ │ │ │ │ │
│every cube │ │ │ │ │ │
│of the pro- │ │ │ │ │ │
│tected area │ │ │ │ │ │
│(kg/m3) │ │ │ │ │ │
│Additional │ 10 │ 5 │ 5 │ 5 │ 5 │
│quantity of │ │ │ │ │ │
│fire extin- │ │ │ │ │ │
│guishing │ │ │ │ │ │
│medium for │ │ │ │ │ │
│every square│ │ │ │ │ │
│meter of the│ │ │ │ │ │
│opening area│ │ │ │ │ │
│(kg/m2) │ │ │ │ │ │
│Basic quant-│ │ │ 50 │ 135 │ 1200│
│ity of fire │ │ │ │ │ │
│extinguish- │ │ │ │ │ │
│ing medium │ │ │ │ │ │
2.Quantity of fire extinguishing medium for local application shall meet the following requirements:
(1)Where flammable solid or flammable liquid is stored in containers with upper openings and flame is limited to one side and the flammable substance is unlikely to fly out of the container in case of fire, the required quantity of fire extinguishing medium shall be 13kg every square meter of the surface area of the protected subject. When the side length of the protected object is less than 0.6m, 0.6m shall be used for calculating the surface area. The multiple for additional quantity shall be 1.4 for high-pressure type and 1.1 for low-pressure type.
(2)As for protected objects other than described in the former subclause, the required quantity shall be equal to the quantity for unit cubage calculated using the formula below multiplied by the cubage of the protected space (refers to the space 0.6m from any point of the protected object, also named imagined protected space).
Q = 8–6xa/A
Where, Q is the quantity of fire extinguishing medium for unit cubage of the protected space (kg/m3), the multiple for additional quantity shall comply with the former subclause; a is the total area of the actual walls around the protected object (m2), and A is the total area of the imagined walls around the protected space (imaged protected space) (m2).
3.Where moveable application is used, the quantity of fire extinguishing medium necessary for each spraying aimer shall be not less than 90kg.
4.Where total flooding or local application is used and there are two or more protected areas or protected objects, the maximum quantity of fire extinguishing medium shall be regarded as the necessary quantity.
Nozzles for total flooding or local application shall be equipped pursuant to the following provisions:
1.Nozzles set for total flooding shall be able to make the sprayed medium quickly and evenly distributed into the whole protected area.
2.Spraying pressure of carbon dioxide nozzles shall be more than 14kgf/cm2 or 1.4Mpa where the fire-extinguishing medium is stored at normal temperature, and more than 9kfg/cm2 or 0.9Mpa where the medium is stored at less than 18℃.
3.Where total flooding is used, the quantity of fire extinguishing medium calculated pursuant to 83.1 shall be sprayed out in specified times following the table below:
│Place │Telecom machine room, telephone │ Others │
│ │exchanger room │ │
│Time (min) │ 3.5 │ 1 │
4.The effective range of nozzles for local application shall cover all surfaces of the protected objects, and the locations shall ensure the flammable substance will not fly outside due to the spraying of the extinguishing medium.
5.The quantity of fire extinguishing medium for local application calculated under Article 83.2 shall be sprayed out in 30 seconds.
Where total flooding or local application is used, the venting devices inside the protected area shall stop running before the extinguishing medium is sprayed.
Where total flooding is used, the opening part of the protected area shall meet the following requirements:
1.The opening may not be located toward safety stairway, special safety stairway, emergency elevator hoistway or other similar places.
2.The proportion of the opening under 1/3 of the height above the floor shall be automatically closed before extinguishing medium is sprayed.
3.In telecom machine rooms, the total area of the opening without automatic closing device shall be not more than 1% of the area of the casing walls. In other places, it shall be not more than 10% of the smaller of the cubage value of the protected area and the area of the casing walls.
The above-mentioned area of the casing walls refers to the total area of walls, floor and ceiling within the protected area.
Containers of fire extinguishing medium shall be equipped pursuant to the following provisions:
1.Filling ratio shall be more than 1.5 and less than 1.9 for high-pressure type, and more than 1.1 and less than 1.4 for low-pressure type.
2.Storage places shall comply with the following:
(1)Outside the protected area.
(2)In places where the temperature is lower than 40℃ and seldom varies.
(3)May not be placed in direct sunshine or rain.
3.Safety device for container shall comply with National Standard CNS No.11176.
4.Valve for high-pressure container shall comply with National Standard CNS No.10848 and No.10849.
5.Low-pressure container shall be equipped with hydrograph and pressure gauge, and pressure alarm device making alarm when pressure is higher than 23kgf/cm2 or 2.3Mpa or lower than 19kgf/cm2 or 1.9Mpa.
6.Automatic refrigerating unit shall be equipped in low-pressure container to maintain the internal pressure at over -20℃ and below -18℃.
7.The device to control the valve of storage container shall be equipped pursuant to following provisions:
(1)The device to control the container valve can be operated manually.
(2)Where the electromagnetic valve is applied to start the container valve, two such valves or more shall be equipped if the containers to be opened are more than 7 sets.
2.Effective quakeproof measures shall be applied.
The filling ratio mentioned in 87.1 refers to the ratio of container cubage (liter) to weight of liquefied gas (kg).
Where gas-actuated is used for CO2 fire extinguishing equipment, the following provisions shall be observed:
1.Container of actuating gas shall be able to endure a pressure of 250kgf/cm2 or 25Mpa.
2.Container of actuation gas shall have a cubage of over 1 liter; the weight of contained carbon dioxide more than 0.6kg, and the filling ratio more than 1.5.
3.Safety device and valve for container of actuating gas shall comply with National Standard CNS No.11176.
4.Container of actuating gas cannot be used for auto stopping in the protected area at the same time.
Piping of carbon dioxide fire extinguishing equipments shall be equipped pursuant to the following provisions:
1.It shall be used dedicatedly and the diameter shall be determined according to the spraying output of nozzles.
2.Seamless steel pipe complied with National Standard CNS No.4626 shall be employed, wherein the thickness or strength shall be the same as or higher than that of pipe number SCH80 for high-pressure type and SCH40 or above for low-pressure type, and anticorrosive treatment like zincing etc shall be made.
3.Where copper pipe is used, the copper pipe shall be made of the copper or seamless copper alloys pipes that comply with National Standard CNS No.5127 or those have the same or higher strength, wherein high-pressure type shall be able to endure a pressure of more than 165kgf/cm2 or 16.5Mpa and low-pressure type more than 37.5kgf/cm2 or 3.75Mpa.
4.Pressure endurance of pipe connector and valves shall be more than 165kgf/cm2 or 16.5Mpa for high-pressure type and more than 37.5kgf/cm2 or 3.75Mpa for low-pressure type, and anticorrosive treatment like zincing etc shall be made.
5.Drop height between highest matching pipe and lowest matching pipe shall be less than 50m.
Selector valve shall be equipped pursuant to the following provisions:
1.Where there are two or more protected areas or objects on a same floor and the storage container is shared by the areas or objects, each shall be equipped with a selector valve.
2.Selector valve shall be placed outside the protected areas.
3.“Selector Valve” and corresponding protected area or object shall be marked obviously.
4.Where storage container and nozzles are equipped with selector valve, safety device or breaking plate shall be installed for matching pipe between container and selector valve.
Manual and automatic actuating device shall be equipped pursuant to the following provisions:
1.Manual actuating device shall meet the following requirements:
(1)Manual actuating device shall be installed outside the protected area where the area can be seen clearly and operator can easily leave away after operation.
(2)Each protected area or object shall be equipped with a set of manual actuating device.
(3)Operating part shall be located 0.8~1.5m above the floor.
(4)The shell shall be painted red.
(5)Where actuating device is electrically actuated, a power indicating lamp shall be equipped.
(6)Operating switch or tie rod shall give out alarm sound on operation and be equipped with effective protection device made of transparent plastic.
(7)Name of protected area, operation guide and safety precaution shall be marked nearby.
2.Automatic actuating device shall be inductively interlocked with fire detector.
The above-mentioned actuating device shall be equipped with automatic & manual switching device pursuant to the following provisions:
(1)Placed at positions convenient for operation.
(2)Manual and automatic indicating lamp shall be equipped.
(3)Changeover key or tie rod shall be used to perform switching between auto and manual.
(4)Operation guide shall be marked nearby the switching device.
Sound alarm device shall be established pursuant to the following provisions:
1.Alarm shall be made automatically after the manual or automatic device is operated, and may not stop before the extinguishing medium is sprayed out completely.
2.Alarm sound shall be effectively made heard by all the people inside the protected area or object.
3.Sound alarm device used in a total flooding area shall employ human voice, unless there is no person on watch at other times.
Safety device for total flooding shall be equipped pursuant to the following provisions:
1.A time delay not less than 20sec shall be provided between the motion of the switch or tie rod of actuating device and the opening of the valve of storage container.
2.Spraying indicating lamp shall be installed at the gateway of the protected area or other proper locations where it is easy to distinguish the lamp.
In protected areas using total flooding or local application, the sprayed fire-extinguishing medium shall be discharged to the safety places according to the following provisions:
1.Any of the following discharging patterns may be selected, and the medium shall be sprayed out in an hour.
(1)Where mechanic discharging is used, exhaust blower shall be used dedicatedly and have a discharge capability of 5times/hour. But it may be shared by other equipments if this doesn’t encumber exhaust.
(2)Where natural discharging is used, there shall be an openable opening. The part of the opening toward the outside air (limited to the proportion of the protected area under 2/3 of the height above the floor) shall occupy not less than 10% of the floor area of the protected area, and it shall be easy for the fire extinguishing medium to diffuse.
2.Operating switch of discharging device shall be installed outside the protected area at the location convenient for operation, and indicating shall be equipped nearby.
3.There shall be no remains of fire extinguishing medium that is discharged out the door.
Emergency power source used for total flooding and local application shall employ self-use generating equipments or battery, the capacity of which shall be able to ensure effectively running for at least 1 hour.
In addition to 87.1, 87.2(2) and (3), 87.3 and 87.4, the following provisions shall be applicable to moveable application:
1.Valve of storage container may be switched manually at the opening of leather pipe.
2.Storage containers shall be equipped separately at the locations where leather pipes are installed.
3.Red indicating lamp shall be equipped and “Moveable Carbon Dioxide Fire Extinguishing Equipments” shall be marked nearby each storage container.
4.The equipments shall be placed where it is unlikely to be covered by fume in case of fire.
5.The quantity of fire extinguishing medium sprayed by each aimer shall be not less than 60kg/minute at 20℃.
6.Leather pipe, nozzle head and pipe carrier of moveable carbon dioxide fire extinguishing equipments shall comply with National Standard No.11177.
Specifications of nameplates used by carbon dioxide fire extinguishing equipments will be prescribed otherwhere by the central fire agency.