When the refrigeration installation master welds the copper pipe, the oxygen bottle used for welding suddenly explodes. The fragments of the oxygen cylinder that flew out during the explosion are directly embedded in the opposite wall, and a whole row of tempered glass in the store is shattered. The masters who were closer to the explosion point were more seriously injured, and both hearing and visual acuity decreased. They were all hospitalized. The salesperson’s thigh was injured and he was discharged after a few stitches.
According to the analysis, the cause of the accident was that the welding was violated and the pressure valve was not tightened, and the pressure in the oxygen cylinder became small, so that the blue flame sprayed during the welding was sucked into the bottle, causing an explosion.
In addition, according to a platform report, an air-conditioning welding explosion accident occurred on 5.29. There were many fragments of oxygen cylinders and fragments of acetylene cans at the scene of the explosion, as well as tools such as welding guns. The welding master died on the spot! It is presumed that during the process of welding the air-conditioning copper tube, the oxygen cylinder and the acetylene tank did not cause an explosion at a safe distance due to improper welding operation.
In fact, regarding the oxygen welding operation and precautions, the common welding operation hazards are listed, but the accidents are still frequent. Here are the common problems in the welding process, I hope to help everyone.
Frequently Asked Questions 1: Oxygen and acetylene bottles are not open
Why store separately? Acetylene is a flammable substance and oxygen is a combustion aid. If acetylene leaks, acetylene mixes with air. When it encounters Mars or open flame, it will explode violently. The explosion will cause the oxygen cylinder to break out and leak oxygen. In this case, the combustion of oxygen makes the explosion more violent. Uncontrollable. So the two of them can't be put together.
Frequently Asked Questions 2: Acetylene bottle lying down, no upright
Why the acetylene bottle must stand upright because the acetylene in the cylinder is dissolved in the acetone solvent under pressure. When the valve is opened, the pressure is reduced and the dissolved acetylene becomes a gas to be released. The transverse acetylene gas cylinder may cause the acetone to flow out. The acetylene dissolved in acetone will quickly evaporate and mix with the air to form an explosive mixture. The explosion limit: 2.3%-72.3% (vol), the small ignition energy of Zui: 0.019mJ, in case of fire Thermal energy causes a combustion explosion. Not only increases the consumption of acetone, but also reduces the combustion temperature and affects the use. At the same time, it will cause tempering and cause acetylene bottle explosion accident; another pressure will blow out the solvent and dissolved acetylene, which will cause the acetylene pressure to rise and explode. Therefore the acetylene bottle must stand upright!
Frequently Asked Question 3: The bottle is exposed to the sun
The temperature of the bottle body should not be exposed, because the temperature of the acetylene cylinder should not exceed 40 degrees, and the boiling point of acetone is 58 degrees. The higher the temperature, the faster the acetone volatilizes, and the acetylene is precipitated, so that the pressure inside the bottle increases sharply!
Frequently Asked Question 4: There is no residual pressure in the oxygen and acetylene gases
The pressure inside the bottle is a few kilograms, so that the pressure inside the bottle is greater than the pressure outside the bottle, which can avoid the inflow of other gases, because the explosion limit of acetylene is very low, slightly mixed with a little air, it will explode when it reaches a certain temperature. Therefore, the ventilator of the acetylene bottle must have a pressure reducing valve to prevent air from mixing into the bottle, otherwise there is a danger of explosion next time. In addition to the pressure reducing valve, it is necessary to prevent the air pressure in the bottle from being lower than the air pressure of the outside air, and to prevent the air from flowing back into the acetylene bottle. The oxygen cylinder should retain the residual pressure of not less than 0.098 to 0.196 MPa gauge pressure. The acetylene cylinder should retain the residual pressure of 49Kpa~98KPa in winter and 196KPa gauge in summer.
Also talk about the taboo of construction operations! Oxygen pressure (prohibited)!
As we all know, after the completion of the welding, the refrigeration equipment must be tested for pressure-tightness and air tightness. However, some people use oxygen to keep pressure in case of insufficient or missing nitrogen. Oxygen pressure has been declared absolutely forbidden! Because there is inevitably oil in the refrigeration system, especially in the compressor, most of the lubricating oil is accumulated inside. Oxygen is oil-free, and it will explode when exposed to oil!
In addition, why the oxygen cylinder, especially the bottle mouth, should not be contaminated or exposed to grease. If the oxygen bottle mouth is stained with grease, when the oxygen is sprayed at a rapid speed, the oil will rapidly undergo oxidation reaction, and the heat generated by the high-pressure airflow and the bottle mouth friction further accelerates the oxidation reaction, so it is contaminated in the oxygen cylinder or the pressure reducing valve. The grease on it will cause burning and even explosion!
Case: An explosion occurred in a compressor, killing 2 people and injuring 2 people! The reason is that when leaking pressure is maintained, oxygen is pumped into the system to check for leaks, and then oxygen is discharged after use, and the compressor is started in the presence of oxygen in the system memory, causing the compressor to explode.
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