Brief Introduction Of Air Foam Fire Extinguishing Agent In The Depot Application - Air Foam Fire

Introduces the tank used air foam fire-fighting mechanism

, composition, types, characteristics, analysis of dry air foam fire extinguishing agent and compatibility issues, pointed out that the use of management considerations.

HC Fire Network 0 Introduction Foam fire extinguishing system is an important oil depot fire system installations, fire control work in the oil played a crucial role, matched with the air bubble Extinguishing agent Work in the oil depot fire is widely used. Understand the mechanism of air foam fire extinguishing agent, familiar with the characteristics of air-foam fire extinguishing agent, for better use, management, foam tank fire fighting system, give full play to Foam fire-fighting equipment Facilities, fire function is important.

1 air foam fire extinguishing agent theory

Air bubble is a certain proportion of foam concentrate and water mixture, after agitation by air, through physical interaction with the air to form Membrane Like bubbles. According to the different nature of multiple bubble bubble up to 2 ~ 1000-fold, relative density (water = 1) at 0.001 to 0.5, much smaller than normal flammable liquid, which may float on the liquid surface to form a thick cover of air bubbles layer.

Isolated air bubbles cover the surface of the combustion of liquid air, on the burning liquid surface has a good choking effect, cooling effect, combined with water vapor bubble heat resulting from evaporation, combustion zone to dilute the concentration of the atmosphere, cut off the flame radiant heat, thus prevent the evaporation heat of combustion of liquid, so that combustible gases into the combustion zone is difficult to achieve the fire fighting function. Should be noted that fire is a complex process, the above-mentioned four kinds of effects are often overlapping work, and must be the overall dynamic View To analysis and research. More stable air bubbles on the oil surface of the closure time is longer, plus the cooling effect, in fire prevention during the resurgence of good performance and is comparable to other fire extinguishing agent can not, and it is air-foam fire extinguishing agent widely used in oil depot One major reason.

2 foam fire extinguishing agent composition and characteristics

Contrast, foam fire extinguishing system efficient, effective, easy to use air foam fire extinguishing agent, the mobile good, safe, reliable, economical and practical, is the oil depot is now the ideal extinguishing agent. Its low expansion foam can be divided into multiples, the multiples and high expansion foam extinguishing agent 3 types; according to the volume of foam concentrate and water mixing ratio different types can be divided into 6%, 3% type 2 types; by composed of different materials, can be divided into two kinds of protein-based molding type of harmony. One commonly used in the depot low expansion foam fire extinguishing agent with protein (vegetable protein, animal protein)-type, F protein-based, aqueous film-forming type 3 categories.

2.1 low-expansion foam fire extinguishing agent

GB50074-2002 " Oil Library design, "provides the ground-mounted roof, internal floating roof tanks should be set for low expansion foam fire extinguishing systems, floating roof tanks should be established for low expansion foam fire extinguishing system. GB50151-2000 "low-expansion foam fire extinguishing systems," provides for non-water-soluble A, B, C liquid storage tank, when using liquid spray foam on the fire may make use of protein, F protein, AFFF liquid ; when using liquid spray foam, the F protein should be used, such as aqueous film-forming foam. Low-expansion foam fire extinguishing agent can be applied to fixed, semi-fixed or mobile foam fire extinguishing systems, foam multiple of less than 20, as compared with major, long-distance spray foam can, wind interference ratio, the expansion foam strong, floating roof spray liquid on the bubble tank put in, easy to form a protective foam covering the surface layer, apply to open fire fighting.

2.1.1 protein foam extinguishing agent

Protein foam extinguishing agent is from animal protein, such as cattle, horses, sheep, pig hoof horn, gross blood or vegetable protein such as soybean, rapeseed, etc., in the alkaline (sodium hydroxide or calcium hydroxide) under the influence of partially hydrolyzed by adding stabilizer, antifreeze, corrosion inhibitors, preservatives, and viscosity control agent Additive Processing liquor. Protein foam liquid raw materials into animal protein and plant protein 2 class. Protein foam extinguishing agent is the first oil tank for fire extinguishing agent is liquid on the oil tank area systems commonly used fire extinguishing agent, the domestic product serialization and standardization.

by: gaga

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