The Design Application of Foam System for Protection of Oil Tanks -----A Case Study for Modifying Subsurface Injection Method
|關鍵字:||固定頂油槽;外浮頂油槽;內浮頂式油槽;空氣泡沫;閃火點;頂部注入法;底部注入法;可撓式軟管底部注入法;Fixed roof tanks;External floating roof tanks;Internal floating roof tanks;Air foam;Flash point;Foam chamber method;Subsurface Injection Method;Flexible Hose Subsurface Injection|
The fire and explosion accidents for oil tank have very high bloodshed and destructive power. It is hard to estimate what the production equipments and raw materials should be lost in such incident. To establish the fire protection technology of oil tank is very crucial for permanent development of the petrochemistry industry so as to reduce frequency and effect of oil tank fire. Fire-fighting foam is an aggregate of air-filled bubbles formed from aqueous solutions and has a lower density than that of flammable liquids. It is principally used to form a cohesive floating blanket over flammable and combustible liquids and prevents or extinguishes fire by excluding the air and cooling the fuel. It also prevents from reignition by suppressing formation of flammable vapors. Therefore, Fire-fighting foam can be used as a fire prevention, control, or exposure protection for flammable liquid fire hazards. Fire-fighting foam for these hazards can be supplied by fixed or semifixed piped systems. It can be applied through foam discharge outlets, which allow it to fall gently over the surface of burning fuel. And it can also be applied by portable hose streams using foam nozzles or subsurface injection systems. The thesis considers the effective design method for foam system and proves the application value of flexible hose subsurface injection method for a real design case, which is for flammable and combustible liquid hazards and atmospheric storage tanks. In this study, it proves that the flexible hose subsurface injection method not only can be survived longer but also be available to reach above 0.9814 for ten years. Apparently, the system is very good and steady that it is worth promoting and adopting for the fire protection of floating roof tanks.
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