Static electricity accident case, how to correctly prevent static electricity?
Case 1
2002In July 2020, the centrifuge (closed type) in the second workshop of a factory in Jiangyan, Jiangsu used antioxidants and toluene solvents for the W-100-1 fabrics that had just been discharged from the enamel retort. At that time, an explosion suddenly occurred, killing one employee and seriously injuring another. The materials were mechanically stirred in the reactor for more than 20 hours, and electrostatic charges accumulated. Since the kettle is an enamel reactor, the accumulated static electricity cannot enter the ground through the reactor ground wire.
The material contains high levels of static electricity.
Case 2
In December 2002, in the slurry workshop of a factory in Danyang, Jiangsu, workers used a vacuum pump to suck vinyl acetate into the reactor, leaving about When 30kg was dropped, an explosion suddenly occurred. The workers put out the fire themselves, and one worker was burned. The cause of the explosion was that vinyl acetate material was produced when it rapidly flowed through plastic pipes.
Static electricity accumulates. When the plastic pipe comes into contact with the zero-potential barrel, a high-bottom voltage potential difference discharge is formed, causing sparks to detonate the vinyl acetate vapor in the air
Case 3
In the late spring of 2005, a sampler from a company took samples from the top of a light oil tank A minor flash fire accident occurred. The completion of the pipeline did not cause any casualties or damage to other equipment, but it showed that during the sampling operation
There are serious accident risks in the process.
Case 4
2000At 14:45 on October 31, 2000, a female employee in the machine repair workshop of a petrochemical plant in Henan carried a square iron barrel with a plastic handle hook to the refinery three. Under the sampling port of the II catalytic crude gasoline valve, we plan to put some gasoline as a cleaning tool during the maintenance of the acidic large pump. When the female employee hung the iron barrel on the sampling valve and opened the hand valve to drain the oil, the oil barrel caught fire. This is a typical case where the valve opening is too large.
Accidents caused by excessive flow of gasoline causing accumulation of static charges and spark discharge.
Case 5
In January 2004, a motorcycle driver went to a gas station to refuel. , park the car next to the metering machine, turn off the engine, use the engine key to open the fuel tank cap and wait for refueling. The gas station staff placed the fuel tank cap made of synthetic resin on the cement protective platform next to it. Without wearing gloves, they directly held the handle of the spray gun with their hands and put the nozzle of the spray gun close to the fuel port of the motorcycle fuel tank. When they started to refuel, a sudden drop from the fuel tank There was a flame coming out of the fuel filler.
Case 6
On July 17, 2007, an incident occurred at the Barton Solvent Plant in Kansas, USA The explosion caused a fire that destroyed the entire oil depot. More than 40 oil storage tanks ranging from 3,000 to 20,000 gallons were ignited in the fire. The accident caused 11 residents and firefighters to receive medical treatment. Barton Solvent Plant ceases operations. The explosion threw the top of the oil storage tank into the air, blowing it 130 feet away. Moments later, it damaged two more oil storage tanks, causing the contents of the two tanks to leak. As the fire spread, ingredients in nearby storage tanks were released and ignited, sending some debris flying and hitting a mobile home and adjacent store. The accident caused 6,000 residents to be evacuated. Thick smoke from the explosion spread more than 200 feet into the air and could be seen from miles away. According to analysis: the accident was caused by static sparks. The static electricity was mainly caused by the static electricity generated by naphtha when it passed through pipelines and pumps. At the same time, the oil was pumped from the tank truck to the storage tank. During the process, due to the entry of air, foam and turbulence are generated, which aggravates the generation of static electricity in the oil
Case 7
On November 30, 1987, the refinery of Yanshan Petrochemical Company loaded oil When Taiwan was loading No. 0 diesel into a Dongfeng 140 tanker at a gas station in Tuzhuang Township, Sanhe County, Hebei Province, the tanker suddenly exploded and caught fire. The explosion blast knocked the driver who was looking at the oil level on top of the tanker to the ground. His face and hands were burned. The 6-square-meter oil storage tank was deformed due to the explosion and was broken in seven places and was scrapped.
Case 8
On May 27, 1995, a southern shipping company “Port A On the 5th, 219 barrels of mixed benzene and 35 tons of polyoxyethylene were loaded at a certain port. Due to the poor sealing condition of the mixed benzene outside the main deck channel, a small amount of benzene vapor escaped.�. The volatilized benzene vapor is denser than air, so it settles in the gap between the dead corner of the bow and the benzene barrel. During operation, friction between the barrel and the ship wall produces static sparks, causing benzene vapor to deflagrate.
Case 9
On June 4, 1997, Guangzhou Shipping Group Company’s “Daqing 203 》The vessel is conducting barge operations at an oil shipping anchorage. Due to the explosion of oil and gas caused by static electricity in the cabin, the “Daqing 203” and three overloaded oil barges exploded and caught fire one after another. The leaked crude oil caused a flowing fire of more than 10,000 square meters on the river surface. The fire killed 9 people and caused direct economic losses of tens of millions of yuan.
Case 10
On April 30, 2006, an oil tanker truck of an oil transportation company During the process of filling E10 90 ethanol gasoline for vehicles with a crane tube at an oil depot, the filling port of the tanker suddenly caught fire. The filler and the driver of the tank truck quickly put out the fire using asbestos quilts placed near the filling port and in the computer-operated display room, without causing any damage. Cause of the accident: This was a fire accident caused by the accumulation of static charges.
Accidents caused by static electricity emerge in endlessly. From the above cases, we can clearly understand that once trivial static electricity causes damage, it will cause inestimable damage. The estimated losses range from economic losses to casualties. So how to remove static electricity from the source is an urgent issue at the moment. If you carefully look at the above cases, you can find that most static electricity comes from the static electricity carried by the human body, causing harm. Therefore, the current mainstream anti-static measures require practitioners to wear work clothes with anti-static properties. The purpose of making such protective clothing The first choice is anti-static fabric.
What is anti-static fabric? Antistatic fabrics can be divided into two forms in terms of weaving. One is to treat general fabrics with antistatic agents to make the fabrics have antistatic properties. It is usually called finishing the fabric after static elimination. The other is to use new conductive fiber and cotton fiber through advanced spinning equipment and weaving technology, and undergo printing and dyeing treatment. It is divided into three categories: pure cotton, polyester cotton, and chemical fiber. The fabric has good durability and anti-static function, and is also dust-proof, washable, and dry-cleaning resistant.
Industrial progress cannot be separated from safety guarantee. Only by ensuring production safety can value be created. Therefore, major relevant enterprises and factories are strongly urged to require employees to wear anti-static work clothes. Protect production progress.
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