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86 512-81666096122，20000m ³ dry powder calculation sheet of lng full capacity tank (part i) - doer equipment
classification：forum publishtime：2019-11-19 14:49:34
20000m ³ dry powder calculation sheet of lng full capacity tank (part i)
1）20000m ³ code for design of dry powder fire extinguishing of lng full capacity tank (gb50347-2004)
2) design data provided by users
design description
1. the design adopts fixed dry powder fire extinguishing system, and the protection object is the discharge pipe of lng storage tank.
2. the design parameters of the protected object are as follows:
1. the design adopts fixed dry powder fire extinguishing system, and the protection object is the outlet pipeline of exhalation valve of 20000 m3 full capacity tank.
2. the design parameters of the protected object are as follows:
diameter of outlet pipe of dispersion pipe: three, outer diameter 355mm.
the system design adopts the local application fire extinguishing method, and the volume method is used for calculation. according to 3.3.4 of code for design of dry powder fire extinguishing system:
1 the calculated volume of the protected object shall be the assumed volume of the closed cover. the lower of the enclosure shall be the actual bottom surface; when there is no actual enclosure structure on the side and top of the enclosure, the distance from them to the external aid of the protected object shall not be less than 1.5m.
2. the design dosage of dry powder shall be calculated using equations (1) and (2),
m= v 1 × q v × t
q v =0.04-0.006 a p / a t
of which:
v 1 is the calculated volume of the protected object (m) ³）
q v is the injection rate per unit volume (kg / s / m ³）
‡ t is the fire extinguishing time《 the standard stipulates that the dry powder spraying time of outdoor or indoor local application fire extinguishing system with re ignition risk shall not be less than 60s
a p is the actual enclosure area of solid wall in the assumed enclosure (㎡)
a t is the side enclosure area of the assumed enclosure (㎡)
the spray nozzle 3 shall be arranged to completely cover the spray object.
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