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Classification：Forum PublishTime：2019-11-20 14:13:06
20000m ³ Calculation sheet for fire sprinkler water of LNG full capacity tank
1. 20000m ³ Standard specifications and basis adopted in the design of fire sprinkler water calculation sheet of LNG full capacity tank
1) Code for fire protection design of buildings (gb50016-2014)
2) Code for fire protection design of petrochemical enterprises (GB50160-2008)
3) code for design of water spray fire extinguishing system (GB50219-2014)
4) Code for fire protection design of petroleum and natural gas engineering (gb50183-2004)
2 design scope
Protect and cool the LNG storage tank.
Design and calculation of 3 water spray system
3.1 calculation of wall surface area of LNG storage tank
Diameter of outer cylinder of LNG storage tank Ø = 36m, height h = 26.5m
Surface area of LNG tank wall S1 = π · D × H =π × thirty-six × 26.5m2 = 2997 m2
The top cover of LNG storage tank is spherical, with radius r = 30.6m and height h = 5.85m
Surface area of LNG tank top cover S2 = 2 π · R × H =2π × thirty point six × 5.85m2 =1125 m2
3.2 calculation of spray water volume of LNG storage tank
Spray water spray intensity of 3.2. 1 LNG storage tank
According to the specification:
Water spray intensity for LNG tank wall design: Q1 = 2.5 L/min. M2 (coefficient derived from GB50219-2014)
Water spray intensity for LNG tank roof design: Q2 = 4 L/min. M2 (coefficient derived from GB50219-2014)
Minimum working pressure of water mist nozzle: 0.2MPa
Duration: 6 h
3.2.2 calculation of spray water volume of LNG storage tank
Calculated water volume of LNG storage tank wall: Q1 = S1 × q1=7500 L/min
Calculated water volume on the top of LNG storage tank: Q2 = S2 × q2 = 4500 L/min
Total spraying water volume: q = Q1 + Q2 = 12000 L / min
3.3 calculation of nozzle quantity of LNG storage tank
3.3.1 flow of single water mist nozzle
q=K·（10P）1/2
Q ---- flow of each water mist nozzle, L / min
K ---- flow coefficient of water mist nozzle
P -- working pressure at the most unfavorable point of water mist nozzle, MPa
The type of sprinkler used in the tank wall is ZSTMB-40-120, spray angle of spray nozzle.
=120
Flow coefficient: k = 40; P takes the minimum value: P = 0.2MPa
q=K·（10P）1/2=56.6 L/min
The type of sprinkler used in the roof of this project is ZSTWC-28-120, spray angle of spray nozzle.
=120
Flow coefficient: k = 28; P takes the minimum value: P = 0.2MPa
q=K·（10P）1/2=39.6 L/min
3.3.2 calculation of nozzle quantity
1. Number of nozzles calculated by water volume:
Number of tank wall nozzles: N1 = Q1 / Q = 7500 / 56.6 = 132.5
Number of nozzles on tank top: N2 = Q2 / Q = 4500 / 39.6 = 113.6
To sum up: the number of top nozzles: 114, the number of tank wall nozzles: 134, a total of 248.
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