Causes and Prevention of Oxygen Bottle Explosion

First, the main causes of chemical explosions are:

1, the oxygen tank mixed with combustible gas. For example, oxygen cylinder pressure is too low, acetylene gas into the oxygen cylinder; oxygen by-product of water electrolysis hydrogen contains hydrogen and so on.

2. Oxygen cylinder valve gaskets and other parts contain grease or organic flammable materials, causing friction or static sparks to cause combustion and explosion when the valve is opened or closed.

3, the bottle infiltrated or stained grease, and the contact with compressed oxygen after the rapid oxidation of combustion, release a lot of heat, and make the temperature rise very high, the bottle pressure. When the cylinder stress limit is exceeded, an explosion occurs. At the same time, the cylinders also undergo strong oxidation. According to data, when the oxygen pressure exceeds 3 MPa, the oil and the oxygen may be spontaneously ignited.

4. Misuse of a bottle filled with other flammable gases or liquids for oxygenation. Users modify the cylinders themselves and brush the hydrogen cylinders or Freon cylinders with azure paint for oxygenation and explode during oxygenation.

Second, the explosion of oxygen cylinders differs according to their causes. There are physical explosions and chemical explosions.

The main causes of physical explosions are:

1. The filling pressure is too high and exceeds the allowable pressure.

2, the cylinder material does not meet the requirements, or manufacturing defects.

3. The cylinder has exceeded its service life, and its residual deformation rate has exceeded 10%. It has already been reported as a waste gas bottle.

4. When the cylinder is filled, the temperature is too low and the material of the cylinder is cold and brittle.

5, when filling oxygen or deflation, the oxygen valve is opened too quickly, resulting in too fast flow, resulting in air friction and impact.

6. The cylinder is filled to the required pressure, and then the cylinder is exposed to heat or exposure to the sun, and the temperature rises with heat, and the pressure rises until the explosion exceeds the limit.

7. The inner and outer surfaces of the cylinder are corroded, the wall of the bottle is thinned, and the strength is reduced.

8. The cylinders are beaten and hit during transportation and handling, resulting in mechanical damage.

3. Measures Taken to Prevent the Explosion of the Oxygen Bottle The basic measure for preventing the explosion of the oxygen cylinder is to formulate practical and feasible safety rules and regulations according to relevant regulations stipulated by the state, and strictly abide by the rules and regulations during the operation.

The relevant provisions of the state are:

1. The design of oxygen station houses shall be designed in accordance with the relevant requirements of GB-50030 "Oxygen Station Design Code" and GBJ16-87 "Architecture Design Fire Code", and shall be approved by the relevant government agencies before being able to build stations. construction;

2. Installation and construction units of oxygenation stations must have appropriate qualification certificates, and comply with the requirements of the "Construction and Acceptance Specifications for Installation of Electrical Installations", "Construction and Acceptance Specifications for Industrial Pipework" and design drawings.

3. The oxygenation station must comply with the provisions of GB17264-1998 "Safety Technical Conditions for Filling Stations of Permanent Gas Cylinders", establish a safety and quality assurance system, formulate corresponding rules and regulations, and be approved by the provincial safety supervision authority to complete registration procedures. Only qualified after on-site assessment;

4. Filling management personnel and filling workers must undergo professional training, pass examinations, and issue qualified certificates before they can take posts;

5, oxygenation station should be set up a reliable lightning protection device. Grounding resistance shall not be greater than 10Ω; pipelines and valves shall be provided with grounding devices for removing static electricity, and the grounding resistance shall not be greater than 10Ω;

6. The safety valve and pressure gauge set in the oxygenation station should be checked regularly;

7. Safety inspection must be performed before cylinders are filled.

The following cylinders are forbidden to be filled:

(1) The seal marks and color marks do not meet the requirements and cannot determine the gas in the bottle;

(2) Modifications that do not comply with the regulations or the user's own modification;

(3) Incomplete, damaged or non-compliant;

(4) No residual pressure in the bottle;

(5) Exceeds the inspection period;

(6) After appearance inspection, there is obvious damage and further inspection is required;

(7) The cylinder is stained with grease;

(8) Gas cylinders manufactured without manufacturing licenses or imported cylinders that have not been approved by the safety inspection authority;

(9) valve thread does not meet the requirements;

(10) The pressure in the bottle is greater than 10Mpa;

(11) The temperature of the cylinder before filling the bottle is lower than 0°C or higher than 60°C;

8. Strictly observe the regulations in cylinder filling:

(1) Operators, labor supplies, and tools must avoid oil. Do not allow contact with oxygen cylinders or oxygenated valves when grease is present.

(2) Open and close the valve slowly;

(3) Pay attention to the inflation pressure level of the cylinder and do not overpressure;

(4) When inflated with liquid oxygen, the temperature must not be lower than the specified temperature;

(5) If a leak is found during filling, the air supply must be cut off and no pressure repairs are allowed.

(6) When the pressure of the oxygenation table is greater than 10 MPa, it is forbidden to fill the empty bottle in the middle;

(7) The cylinder filling fixture is not allowed to be directly clamped on the bottle valve's helmet;

(8) When the empty bottle is loaded on the platform and the pressure is equalized, if there is a severe sound of airflow, stop immediately and remove the cylinder for inspection;

(9) Check the cylinder temperature during the filling process. Found abnormal temperature to stop the aeration, remove the inspection;

(10) Bottles must be protected against falling chains;

(11) When inflating with multiple oxygen presses, note that the flow rate must not exceed the allowable range of the pressure;

9. The helmet shall be equipped with a helmet and a shockproof ring when handling the gas cylinders; it shall be lightly loaded and unloaded; throwing and rolling shall be strictly prohibited; the means of transportation shall have safety signs; the shade facilities shall be provided in summer; the fireworks shall be strictly prohibited; Explosive transport together;

10. The distance from the naked flame when storing and using the gas cylinder shall not be less than 10m; the full gas cylinder shall not be exposed to sunlight; if the bottle valve is frozen when used in winter, it is forbidden to bake with open flame, and the application shall be hydrolyzed; when using neutral, it shall be prevented. Dumping measures; knocking and collision are strictly forbidden; bottle cylinders must not be used up, residual pressure of 0.05 MPa must be left, and opening and closing valves should be slow;

11. The oxygen cylinder must be inspected once every three years. In case of suspicion, timely inspection is required; valves and bottle valves must be strictly oiled during repairs; gaskets and gaskets must be made of specified materials and must not be replaced by materials that have not been subjected to safety tests; oxygenated hoses must be made of copper alloy or stainless steel. Quasi-use rubber hoses; fire extinguishers used in oxygenation stations must not contain oil.