Fire prevention and explosion prevention of the ho

Fire and explosion prevention of ship electrical

fire and explosion accidents caused by the operation failure of ship electrical equipment account for a large proportion, and the accidents have particularity, which should be paid enough attention to

causes of electrical fire and explosion of ships

1. the complexity of ship operation and the particularity of electrical system operation

ships are often in the changeable conditions of wind, waves, rainstorms and oceans, which are easy to cause turbulence, vibration and impact; The ambient temperature changes greatly, especially in the navigation of ships in the unlimited navigation area; There are many kinds of goods transported by ships with different characteristics. The working environment of ship electrical equipment is high in temperature and humidity, and the air contains corrosive and polluting gases such as salt mist and oil mist; The capacity of marine power station is relatively small, the working conditions are complex, and the load changes greatly, which affects the changes of voltage and frequency. Therefore, the safety requirements for ship electrical equipment are more stringent

2. Causes of fire and explosion caused by ship electrical

the causes of fire and explosion caused by ship electrical have their complexity and particularity. Failure, improper use or poor management of ship electrical equipment during operation can cause fire hazards. These hidden dangers are mainly used as the heat source or fire source of fire. The heat source of electrical equipment includes normal and abnormal, such as normal breaking sparks of various contacts, and abnormal sparks generated by insulation short-circuit points, line breaking points, etc. There are normal high-temperature components, such as electric lamps, and abnormal high temperatures, such as short circuit or grounding caused by water inflow of electrical equipment (especially sockets), and local heating at the short-circuit point or grounding point; The electrical equipment or cable is overloaded for a long time, or the temperature is too high due to excessive current caused by short-circuit fault and abnormal voltage; Overheat the line due to disorderly pulling and connecting wires, or connecting electric heaters or other electrical equipment on sockets that exceed the allowable carrying capacity of the line; Insulation strength reduction or insulation damage caused by other reasons, short circuit and grounding fault, causing local overheating

normal spark, abnormal spark, normal high temperature and abnormal high temperature may cause fire or explosion. When a normal fire source or heat source encounters combustible substances, it becomes a fire, and its output voltage hazard can be detected

the causes of combustion and explosion in some special parts of the ship have their own particularity, such as the battery and battery room as the ship's emergency power supply. When charging, the battery will produce hydrogen, which is lighter than air. If there is no ventilation device at the height of the battery room or the ventilation device is not working well, hydrogen will accumulate at the top, and explosion will occur in case of fire. There are also some special ships with larger gaps, such as oil tankers, which have more and more complex causes of fires and explosions

requirements for fire and explosion prevention in ship construction

the code for classification and construction of steel inland river ships and the code for classification and construction of steel sea going ships and the statutory inspection technical rules are very strict on ship electrical fire and explosion prevention, which is the close and strict requirements for the stability of cooperation. The requirements for fire and explosion prevention of electrical equipment are to avoid and pay attention to eliminating all kinds of fire hazards mentioned above when building ships, whether in design or construction. During the inspection, maritime law enforcement officers shall check whether the ship's electrical equipment meets the requirements of the technical rules

1. marine electrical equipment must meet the technical conditions of marine environment

for ships operating in complex environments, electrical equipment operating in special environments must meet the technical conditions of marine environment. If these conditions are met, the ship's electrical equipment can be guaranteed to have no or less failures or damage, and no or less hidden dangers of electrical fire and explosion. The manufacturer of marine electrical equipment must be approved by the ship inspection department, and the marine electrical equipment must have the type approval certificate of the ship inspection department

the marine environmental technical conditions that marine electrical equipment must meet include the following points:

(1) adapt to vibration and impact. Vibration can loosen the fixed or connecting parts of electrical equipment and damage or malfunction the structure of parts. Therefore, there should be anti loosening measures, vibration reduction or isolation measures, with a solid vibration and impact resistant mechanical structure

(2) adapt to tilt and swing. The continuous tilting and rocking destroys the balance of force in the normal static position, and generates additional force on moving parts, resulting in equipment failure or damage to the best trade communication channels provided by the company for machinery and raw material buyers and sellers in China, Asia, the Middle East, Africa and the world

(3) adapt to ambient temperature. Ambient temperature has an important impact on the performance and service life of electrical equipment. Ambient temperature includes air temperature and sea water temperature