Analysis and preventive measures of fire and explo

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Fire and explosion accident analysis and preventive measures of steel barrel coating production line

(continued from the previous issue)

⑶ smoking and carrying lighters, matches and other igniters are prohibited in the coating construction site

⑷ when the painting workshop needs hot work for maintenance and welding, the hot work approval procedures must be handled first, and the painting operation should be stopped after approval. Before hot work, the paint dirt and various combustible substances within 30 meters of the operation site should be cleaned first. The paint barrel and paint groove should be covered and sealed. The concentration of organic solvent vapor in the air should not exceed 1/3 of the lower explosion limit, so as to prevent fire during hot work

(5) the spraying workshop must be equipped with strong ventilation equipment, and the natural ventilation conditions are good. In addition to local ventilation, the paint mixing room, paint spraying room and drying room should also measure the concentration of mixed gas at any time to prevent reaching the dangerous limit. If there is a fire hazard, turn off the ventilation immediately

⑥ in addition to the materials directly needed for production, the coating workshop shall not accumulate a large number of flammable and combustible materials to avoid fire

⑺ the doors and windows of painting workshop, paint mixing room, drying oven, etc. should be opened outward

2. Electrical fire prevention measures

⑴ the electrical equipment in the painting workplace must be installed or repaired by a full-time electrician. In addition, when installing and overhauling electrical equipment, the spraying operation should be stopped, and inflammables such as paint and thinner should be moved to a safe place and tightly covered with non combustible materials to avoid fire caused by electrical sparks

⑵ the electrical equipment and lighting devices in the painting workshop must be explosion-proof. For example, the fan applies explosion-proof motor, and the fan impeller should be non-ferrous metal, so as to avoid sparks caused by ferrous metal collision. Explosion proof lamps must be used for lighting

⑶ all painting equipment, such as paint cabinet, induced draft fan, sprayer, conveyor chain, etc., should be installed with electrostatic grounding device, and its grounding resistance should not be greater than 10 ohms. All kinds of power transmission switches, distribution boards, circuit breakers, etc. are best installed outdoors and in safe places. (4) in electrostatic spray painting, in order to ensure fire safety, the voltage shall not be higher than 80000 volts, and the distance between the spray gun or spray plate and the steel barrel shall not be less than 250 mm, so as to avoid discharge caused by high voltage or too close spray distance, and fire caused by electric fire

3. Fire prevention measures for drying furnace

⑴ it is strictly forbidden to use electric heating elements with exposed resistance wires. The causes and troubleshooting of such faults should be steam, hot air and remote: (1) the hardness tester should be installed with non horizontal infrared electric heating elements for drying. If the infrared lamp is used for drying, the infrared lamp should be fixed in the niche, and glass should be added outside. 2. If the machine is not used for a long time after the experiment, the cover should be protected. To prevent electric leakage and fire. (2) when drying steel drums, the paint spraying room should be a little far away from the drying furnace, and do not rush into the drying furnace, so as to prevent the vapor of most of the solvent in the newly sprayed paint from spreading in the drying furnace, which will cause fire or explosion accidents in case of high temperature

⑶ when baking the steel barrel in the drying furnace, the ventilator must be started to prevent the solvent vapor from accumulating in the furnace and reaching the explosion limit concentration. If there is no ventilation equipment in the drying furnace, the drying time outside the furnace before entering the furnace can be extended to fully volatilize the solvent

⑷ for long automatic drying furnaces, ventilation pipes should be installed on the top, and explosion-proof doors should be installed at appropriate positions. In order to relieve pressure in case of accidents, it is also conducive to timely troubleshooting in the furnace

⑷ the oven temperature should be controlled not to be higher than the natural point of the solvent in the paint to prevent spontaneous combustion

4. Fire prevention measures for paint storage

⑴ paint and solvent should be stored in a dry, cool, ventilated, heat insulated warehouse without direct sunlight. The fire resistance rating of the warehouse shall be level I and level II, and shall not be mixed with ordinary materials

⑵ open flames and smoking are not allowed within 30 meters of the storage warehouse, and the sign of "no smoking" should be posted

⑶ a wooden frame must be set up in the storage warehouse, and the paint bucket must be placed on the wooden frame to ensure stability. It is strictly forbidden to collide with the paint bucket upside down, causing sparks and causing fire

⑷ when the paint is stored in the warehouse, it should be handled with care. The manual stacking should not exceed 1.8m, and the mechanical stacking can be appropriately higher to avoid accidents caused by stacking

(5) combustible items such as cotton yarn and rags soaked in paint shall not be stacked in front of the paint warehouse, so as to avoid excessive backlog and heat or fire caused by electric fire and thunder

5. Fire fighting measures

⑴ the coating workshop or paint warehouse should be equipped with automatic fire extinguishing equipment, and the paint warehouse should be equipped with cooling equipment to ensure safety. (2) paint workshop, paint mixing room, drying furnace, warehouse, etc. must be equipped with sufficient fire extinguishers such as foam and dry powder, dry sand and asbestos board. The fire extinguishers shall be distributed according to the principle of combining dispersion and concentration. Management personnel should know the common sense of fire prevention, otherwise the fixture will be damaged; Fire knowledge, and be able to master fire extinguishers. Fire extinguishers should be checked frequently and changed regularly

⑶ each construction worker, Fang can, an intern of xieqingyu and huangyingchuan, a reporter of coating Nanfang Daily, should keep in mind the danger of flammability and explosion of paint, have certain knowledge of fire prevention and extinguishing, and be skilled in using fire extinguishers and simple fire-fighting equipment. In case of fire, close the iron door of the adjacent workshop immediately, cut off the power supply of various equipment, and put out the fire immediately. If necessary, report to the relevant departments first and cooperate in extinguishing the fire. (end of full text)

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