Causes and prevention of explosion of the hottest

2022-08-15
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Reasons and prevention of oxygen cylinder explosion

first, according to the different causes of oxygen cylinder explosion, there are physical explosion and chemical explosion. The main causes of physical explosion are:

1. The filling pressure is too high, exceeding the specified allowable pressure

2. The gas cylinder is charged to the specified pressure, and then the temperature of the gas cylinder rises due to its proximity to the heat source or exposure to the sun, and the pressure rises accordingly until the explosion exceeds the limit

3. The inner and outer surfaces of the cylinder are corroded, the cylinder wall is thinner, and the strength is reduced

4. The cylinder is knocked and impacted during transportation and handling, resulting in mechanical damage

5. The cylinder material does not meet the requirements, or there are manufacturing defects

6. The residual deformation rate of the gas cylinder has exceeded 10% after its service life, and it is a discarded gas cylinder

7. The temperature of the gas cylinder during filling is too low, which makes the material of the gas cylinder cold and brittle

8. When filling or venting oxygen, the oxygen valve is opened too quickly, resulting in too fast flow rate and air flow friction and impact

second, the main causes of chemical explosion are:

1. Grease is infiltrated or contaminated in the bottle. After contacting with compressed oxygen, it oxidizes and burns sharply, releasing a lot of heat, raising the temperature and increasing the pressure in the bottle. When the stress limit of the cylinder is exceeded, a steel explosion will occur. At the same time, the cylinder will also undergo strong oxidation. According to the information, when the oxygen pressure exceeds 3Mpa, the grease may spontaneously ignite in direct contact with oxygen

2. Misuse bottles filled with other flammable gases or liquids for oxygen filling. The user refitted the steel cylinder by himself, painted the hydrogen cylinder or Freon steel cylinder with sky blue paint for oxygen charging, and an explosion occurred in the process of oxygen charging

3. Combustible gas is mixed into the oxygen bottle. For example, the pressure of the oxygen cylinder is too low, and acetylene gas rushes into the oxygen cylinder; The oxygen by-products obtained from hydrogen production by water electrolysis contain hydrogen, etc

4. The gaskets and other parts of the oxygen cylinder valve are made of grease or organic flammable materials, which produce friction or electrostatic sparks when opening and closing the valve, causing combustion and explosion

III. measures to prevent oxygen cylinder explosion

the fundamental measure to prevent oxygen cylinder explosion is to formulate practical safety rules and regulations according to the relevant national regulations, and strictly observe them during operation. The key points of relevant national regulations are:

1. The design of the oxygen station building shall be undertaken by the units with corresponding design qualifications in accordance with the relevant provisions of gb-50030 code for design of oxygen stations and GBJ code for fire protection design of buildings, and the station construction can be carried out only after being approved by the relevant government departments

2. The installation and construction unit of the oxygen charging station must have the corresponding qualification certificates, and carry out the construction in accordance with the code for construction and acceptance of electrical equipment installation engineering, code for construction and acceptance of industrial pipeline engineering, and the provisions of the design drawings

3. The oxygen filling station must comply with the provisions of GB "technical conditions for safety of permanent gas cylinder filling stations", establish a safety quality assurance system, formulate corresponding rules and regulations, go through the registration procedures with the approval of the provincial safety supervision organization, and fill after passing the on-site assessment

4. Filling managers and filling workers must undergo professional training, pass the examination, and be issued with a certificate of qualification before taking up their posts

5. The oxygen charging station should be equipped with reliable lightning protection devices. The grounding resistance shall not be greater than 10; Pipelines and valves shall be equipped with grounding devices to conduct and remove static electricity, and the grounding resistance shall not be greater than 10

6. The safety valve and pressure gauge set in the oxygen charging station should be calibrated regularly

7. Safety inspection must be carried out before filling the gas cylinder. It is strictly forbidden to fill the following cylinders:

(1) the steel seal mark and color mark do not meet the requirements and the gas in the cylinder cannot be judged

(2) the modification does not conform to the regulations or is modified by the user

(3) the accessories are incomplete, damaged or do not meet the requirements

(4) there is no residual pressure in the bottle

(5) exceeding the inspection period

(6) after appearance inspection, there is obvious damage, which needs further inspection

(7) the gas cylinder is stained with grease

(8) cylinders manufactured without a manufacturing license or imported cylinders not approved by the safety inspection authority

(9) the valve thread does not meet the requirements

(10) the pressure in the bottle is greater than 10MP (10) research and utilization of high-performance high molecular materials technology; A

(11) the steel cylinder temperature is lower than 0 ℃ or higher than 60 ℃ before filling

8. Strictly observe the regulations during cylinder filling:

(1) operators should avoid oil on their hands, labor protection supplies and tools. It is forbidden to contact with oxygen cylinders and oxygen charging valves when there is grease

(2) open and close the valve slowly

(3) when the empty bottle is equalized on the stage, if there is a fierce air flow sound, it should be stopped immediately, and the cylinder should be unloaded for inspection

(4) during the filling process, check the gas statistical data to indicate the bottle temperature. In case of abnormal temperature, stop inflation and remove it for inspection

(5) the bottle should be protected by an anti overturning chain

(6) when inflating with multiple oxygen compressors, pay attention that the flow rate should not be greater than the allowable range under this pressure

(7) pay attention to the inflation pressure level of the cylinder, and do not overpressure

(8) when gasifying and inflating with liquid oxygen, the temperature shall not be lower than the specified temperature

(9) if air leakage is found during bottle filling, cut off the air source first and do not repair under pressure

(10) when the pressure of the oxygen charging platform is greater than 10MPa, it is strictly forbidden to refill the empty bottle halfway

(11) the cylinder filling fixture is not allowed to be directly clamped on the safety helmet of the cylinder valve

9. Safety helmet and shockproof ring shall be installed during cylinder handling; Load and unload with care, and do not throw or roll; The means of transportation shall be provided with safety signs; Shading facilities shall be provided in summer; No fireworks; Do not transport with inflammables and explosives

10. The distance from the cylinder to the open fire shall not be less than 10m during storage and use; Full gas cylinders shall not be exposed to the sun; If the bottle valve is frozen during winter use, it is strictly forbidden to bake it with open fire and thaw it with boiling water; Anti dumping measures shall be taken when using neutral release; It is forbidden to knock or collide; The gas cylinders in the cylinder shall not be used up, and the residual pressure of 0.05Mpa must be reserved; Open and close the valve slowly

11. Oxygen cylinders must be inspected regularly every three years. In case of doubt, it should be tested in time; The valve and bottle valve shall be strictly degreased during repair; Gaskets and gaskets shall be made of specified materials, and materials without safety test shall not be used; The oxygen charging hose must be kept clean with copper alloy (it is best to clean after each experiment); Or stainless steel, rubber hose is not allowed; The fire extinguisher agent used in the oxygen charging station shall not contain oil

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