Urban pipe gallery fire extinguishing system

Cable trenches, cable interlayers, cable shafts, and distribution cabinets are the most representative fire protection difficulties in power, telecommunications, petrochemicals, metallurgy, municipal and other systems. The key to the safe operation of equipment and facilities lies in the safety of cables, because once a fire occurs in cable interlayers, tunnels, shafts, and distribution cabinets, the consequences will be unimaginable.

Analysis of cable fire causes

The direct cause of cable fire is long-term operation of the cable, which leads to aging of the insulation layer, oxidation of the joints, and increased contact resistance, causing overheating of the cable joints and causing cable fire; External factors such as sparks generated during construction, improper design, and rodent damage are also common causes of cable fires. Once these places catch fire, they spread rapidly and produce a large amount of toxic thick smoke, making it difficult for personnel to enter and extinguish, posing a great risk.

◆ Cable trench and cable interlayer fire solution - suspended dry powder fire extinguishing device

The traditional method of preventing and extinguishing cable fires is to set up fire compartments and seals in these places. Once problems occur, the losses can be reduced within a fire compartment, and there is no good proactive fire extinguishing method. Moreover, the cable trench space is narrow, making it difficult to install traditional fire extinguishing devices. However, the installation of ultra-fine dry powder automatic fire extinguishing systems is convenient and efficient, which can effectively solve the automatic fire protection in these places.

Suspended dry powder fire extinguishing devices include suspended pressure storage and suspended non pressure storage. In the event of a fire, signals can be provided without detection and alarm equipment, and the system can be automatically started. The system structure is simple, easy to install, and does not require civil engineering.

The fire extinguishing device can be arranged on the top of the protected object. Each group is started by a startup component, which can provide address code feedback to the control room through the module. When applied in cable tunnels, if a fire breaks out at one point, only a nearby set of fire extinguishing devices need to be activated. High reliability, low firefighting cost, high firefighting efficiency, and convenient replacement. No need for regular maintenance like traditional automatic fire extinguishing equipment.

Fire extinguishing effect analysis of suspended dry powder fire extinguishing device

1. Ultra fine dry powder fire extinguishing agent is non-toxic, harmless, non irritating to human skin, and non corrosive to protective materials; A new type of fire extinguishing agent that does not decompose, absorb moisture, or clump under normal conditions, and has good fluidity, dispersion, and electrical insulation properties. The average particle size is less than 5 microns, which is 6-10 times the fire extinguishing efficiency of ordinary dry powder, 10 times that of heptafluoropropane, and more than 12 times that of carbon dioxide.

2. The hanging dry powder fire extinguishing device has special advantages in extinguishing fires in cable trenches, cable interlayers, cable shafts, and distribution cabinets. It can provide local protection and achieve full gas submergence protection. There are two starting methods: automatic and manual, which can be used as a single device, or multiple devices can be linked with the commonly used fire alarm control system in the market to form a non pipe network fire extinguishing system.

3. The hanging dry powder fire extinguishing device adopts a hanging structure, and only needs to be hung above the protected object to achieve dual effects of total flooding and local protection. The effective period of the agent can reach more than five years, and the comprehensive cost-effectiveness is high.

According to the characteristics of cable tunnels and other places, fire extinguishing equipment should be selected as safe, environmentally friendly, economical, and highly efficient. Compared to the high cost of water mist fire extinguishing and the pollution and corrosiveness of aerosol fire extinguishing systems, suspended dry powder fire extinguishing devices have excellent fire extinguishing effectiveness, environmental reliability, and are particularly suitable for application in cable trenches, cable interlayers, cable shafts, distribution cabinets, and other places, and are worthy of widespread promotion and application.