Consumption of the hottest fire water and extingui

2022-07-24
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Consumption of fire water and extinguishing agent - plant fire water consumption

plant fire water consumption:

plant fire water consumption shall be determined by the number of fires in the same time and the water consumption for one fire extinguishing shall be determined by the product of the number of fires in the same time and the water consumption for one fire extinguishing

number of fires at the same time the number of fires in the chemical plant is related to the floor area of the base and the population of the residential area attached to the plant. Generally, the requirements in table 13-19 shall be met

table the number of fires in the factory at the same time

once is calculated according to the maximum fire water consumption of the factory; Another calculation is based on the large fire water consumption of auxiliary production facilities for rapid oil drainage or residential areas of the plant

note: if there is a separate fire water supply system for each branch, tank farm and residential area of a large plant, it shall be calculated separately

primary fire extinguishing water consumption the primary fire extinguishing water consumption of the chemical plant shall be comprehensively balanced and determined according to the fire risk, scale, floor area, maturity of production process and fire prevention facilities adopted in the production unit area and auxiliary facility area

1. The calculation of outdoor fire water consumption in residential areas

shall be in accordance with the requirements of table 13-20

2. The calculation of water consumption for outdoor fire protection of buildings with firm protective covers

shall be in accordance with the requirements of table 13-21

3. Calculation of water consumption for fire protection in the storage tank area

table 13-20 outdoor fire water consumption in residential areas

note: 1 The fire water consumption shall be calculated according to the building with the largest fire water demand or the largest section between firewalls. The buildings arranged in groups shall be calculated as two adjacent buildings with large fire water demand. 2. the outdoor fire water consumption of warehouses at stations and wharves shall be determined according to class C warehouses with corresponding fire resistance rating

the supply intensity of cooling water for storage tank shall be calculated according to the perimeter of tank wall per meter. When the portable water gun is used for cooling, 0.8 L/s * m is taken against the fire pot; Take 0.7 L/s · m for the adjacent tank (calculated according to the half circumference of the storage tank). When a fixed cooling mode is adopted, 0.5 L/s · m shall be taken for both the fire pot and the adjacent pot. Cooling water supply time: floating roof tanks, underground and semi underground fixed roof storage tanks and aboveground fixed roof storage tanks with a diameter less than 20 meters shall be calculated as 4 hours of cooling. The above ground fixed roof storage tank with a diameter greater than 20 meters shall be calculated as 6 hours. Cooling shall be considered for aboveground, semi underground and underground fire storage tanks, as well as adjacent aboveground, semi underground and underground tanks within the range of 1.5 times the diameter of the fire tank from the tank wall and without soil on the top. When there are more than 3 storage tanks within the above range, the cooling water volume is still considered as 3 of the larger storage tanks. When the ignition tank is a floating roof tank, cooling of its adjacent storage tank may not be considered

4. Calculation of fire water consumption in LPG tank area

the above ground LPG storage tank with thermal insulation layer made of burning materials and without thermal insulation layer shall be equipped with fixed fire cooling sprinkler facilities, which should be comprehensively considered with the sprinkler facilities for sun protection in summer

cooling shall be considered for the control of cooling water consumption for the fire tank and the adjacent tanks within 30 meters from the fire tank wall. If the capacity of the ignition tank is less than 200 cubic meters, it can be reduced to 15 meters. The watering intensity is calculated as per the surface area of the storage tank. Yunnan will develop and expand the dominant rubber industry. The meter per minute is not less than 3 liters. When the Fixed firefighting cooling and sprinkling facilities are set, the auxiliary mobile water gun cooling facilities shall also be considered. The number of water guns shall not be less than 4, the water supply capacity of each shall not be less than 7.5 L/s, and the pressure at the outlet of the water gun shall not be less than 3.5 kg/cm2

5. Fire water consumption of auxiliary production facilities: 30 L/s

6. The calculation of fire water consumption for open-air production units

shall be comprehensively considered according to the fire risk, scale and the setting of fire-fighting facilities. When the low-pressure fire water supply system is adopted, the fire water consumption can refer to table 13-22

table fire water consumption of outdoor devices, L/S

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