What are the components of a foam fire extinguishing system?

1 Stationary foam fire extinguishing system.

The fixed foam fire extinguishing system is composed of a fixed foam liquid fire pump, a foam liquid storage tank, a proportional mixer, a foam mixture conveying pipeline and a foam generating device, etc., and is integrated with the water supply system. In the event of a fire, the fire pump is activated and the relevant valve is opened, and the system can extinguish the fire.

2 Semi-stationary foam fire extinguishing system.

Part of the system equipment is fixed, can be started in time, the other part is not fixed, in the event of a fire, enter the scene and fixed equipment to form a fire extinguishing system to extinguish the fire. According to the different equipment of fixed installation, there are two forms: one is equipped with a fixed foam generating device, foam mixture pipeline, and valve.

In the event of a fire, the foam mixture is fed by a foam fire truck or a motorized pump through a hose from the reserved interface. The other is to have a fixed foam fire pumping station and the corresponding pipeline, when extinguishing the fire, the mobile foam generating device (such as foam gun) is connected with the fixed pipeline through the hose to form a fire extinguishing system. (a foam extinguishing system consisting of a fire truck and a fire hose connected to a fixed foam generator or consisting of a fixed foam station and a fire hose, foam hose gun or hook pipe, etc.).

3. Mobile foam fire extinguishing system.

The mobile foam fire extinguishing system is generally composed of a water source (outdoor fire hydrant, fire pool or natural water source), foam fire truck or mobile fire pump, mobile foam generating device, water hose, foam gun, proportional mixer, etc. When a fire breaks out, all mobile facilities enter the site and are connected by pipes and hoses to form a fire extinguishing system.

The system has the advantage of being flexible in use and not affected by initial combustion**. However, due to the application after the fire, the extinguishing is not as timely as the fixed foam fire extinguishing system, and at the same time, because the fire extinguishing equipment is greatly affected by external factors such as wind, the loss of foam is large, and the amount and strength of the foam that need to be supplied are larger.

There are mainly fire pumps, foam proportional mixing devices, pipelines, and high-multiple foam generating devices.

The foam fire extinguishing system is mainly composed of a foam fire pump, a foam liquid storage tank, a foam proportional mixing sock (device), a foam generating device, a round or shed control valve and a pipeline. Its working principle is: through the foam orange proportional mixer (device), the foam liquid and water are mixed into a foam mixture in proportion, and then the foam is generated by the foam generating device, and applied to the fire object to extinguish the fire.

Foam fire extinguishing systems can be divided into the following three categories according to their structural form:

1.Pressure foam system: The pressure foam fire extinguishing system uses the physical characteristics of foam and water to add air or inert gas to the pipe to make the mixture foam at the outlet, so as to achieve the purpose of fire extinguishing.

This structural form is suitable for large buildings, offshore ships, aircraft and other fire protection fields.

2.Liquid Foam System: The liquid foam fire extinguishing system controls and extinguishes the flame by spraying foam formed by mixing the foam generator with air and water onto the fire site. This structure is usually suitable for fire protection fields such as petrochemical industry, ship docks, and agency garages.

3.Dry foam system: The dry foam fire extinguishing system is to store the pre-prepared foam concentrate (without water) in the foam tank, and then spray the concentrate into the pipeline through the empty spring air system, and atomize it by pressure and then spray it on the fire site.

This structural form is suitable for high temperature and high humidity environments, such as power equipment cabinets, oil depots and other fire protection fields.

In short, the foam fire extinguishing system has the advantages of good extinguishing effect, wide range of application and easy use. However, different types of foam fire extinguishing systems also have their own limitations, and it is necessary to fully consider the fire protection requirements and technical conditions in practical application, and select appropriate equipment and operation methods to achieve the best fire protection effect.

Answer]: c, d, e

Foam fire extinguishing systems are divided into fixed, semi-fixed and mobile according to the structure of the combustion system.

Test Center**] "Fire Safety Technology Pi Wei Jing Practice" textbook Shan Qi page 251.

Answer]: A fire foam bubble fire extinguishing system is composed of fire foam bubble trousers, control device, fire pump, foam liquid storage tank, foam proportional mixing device, pipeline and valve.

The fire extinguishing mechanism of the foam fire extinguishing system is oxygen isolation asphyxiation, radiant heat barrier, and endothermic cooling. The following is the specific introduction of the foam fire extinguisher: 1. Scope of use:

It can be used to extinguish fires caused by the burning of wood, cotton cloth, etc. Foam fire extinguishers should not be used to extinguish fires on live equipment, otherwise they will threaten personal safety. 2. Storage location:

Foam fire extinguishers should be stored in a dry, cool, ventilated and convenient place, not near high temperature or places that may be exposed to the sun to prevent carbonic acid decomposition and failure; In winter, anti-freezing measures should be taken to prevent freezing; And the dust should be wiped frequently, and the nozzle should be dredged to keep it unobstructed.

Answer]: a, b, c, d

This question examines the composition of a stationary foam fire extinguishing system. The stationary system is composed of a fixed foam fire-fighting Kaibi pump, a foam proportional mixer, a foam production (generation) and a monitoring and selling position and pipeline. Therefore, the answer to this question is ABCD.