Safety use of oxygen cylinders

Oxygen bottles are stored and transported in special high-pressure oxygen container, which is part of the bottle 3, and a bottle cap or bottle valve. There are two anti-vibration aprons on the outside of the bottle body, the bottle body is sky blue, and the word “ oxygen ” is marked with black paint to distinguish other cylinders. As an ideal combustion gas, oxygen is widely used in welding and cutting. Oxygen cylinder is a kind of mobile container containing compressed gas for combustion, high pressure, frequent loading and unloading, messy use environment, often make the use of oxygen cylinders in an unsafe state, once the cylinder explosion accident, will give people's lives and property Cause huge losses.

(a) Currently, there are several hidden dangers in the use and management of oxygen cylinders:

1 . Super test period filling. According to the former Ministry of Labor's "Cylinder Safety Supervision Regulations," oxygen cylinders must be inspected every 3 years. Its purpose is to promptly identify the safety conditions of oxygen cylinders and detect defects and hidden dangers in time to avoid accidents. However, the use of oxygen cylinders during the super-test period is more serious, which brings serious risks to safe use.

2 . The attachment is damaged or missing. Accessories for oxygen bottles include bottle valves, handwheels, caps, and shockproof aprons. The bottle cap is to prevent the gas bottle valve from being damaged by impact during the transportation process, and even being blown to cause the gas to be ejected at a high speed, which promotes high-speed flying of the bottle valve and the hand wheel to cause casualties. The anti-vibration ring is a kind of protection device to prevent the cylinder from being impacted, and it is required to have a certain thickness and elasticity. The "Cylinder Safety Supervision Regulations" clearly stipulates that protective caps must be worn when transporting and handling gas cylinders. However, in actual use, there are few complete accessories for oxygen cylinders. Most of them do not have caps, hand wheels, and the valves are scarred. The stem is hit by a bend or even deformed seriously, which poses a serious threat to safe use.

3 . Sun exposure. The “Cylinder Safety Supervision Regulations” stipulates that cylinders shall be transported and used during summer to prevent exposure. Because the volume of the oxygen cylinder is limited, the exposure will increase the temperature of the medium in the bottle, causing the pressure in the bottle to increase rapidly, and the cylinder is in a dangerous state. Some users did not take sunshade measures during transportation and placed the oxygen cylinder under the sun during summer use. In particular, the temperature of highways in the summer often reaches more than 40 degrees. If there are defects in the cylinders, excessive filling or collisions with each other, an explosion accident may occur.

4 . The safety distance is not enough. The “Cylinder Safety Supervision Regulations” stipulates that oxygen cylinders must be 10 meters away from the open flame when in use and must not be stored in the same room as acetylene cylinders during storage. Many users have neglected this requirement. There is a phenomenon that the distance from the oxygen cylinder to the welding point is less than 10 meters and the oxygen cylinder and the acetylene cylinder are stored in the same room during the welding operation. Once the gas cylinder leaks, an explosion in the event of an open flame will cause irreparable damage.

5 . Barbaric handling. Barge loading and unloading is common during transportation and use. For example, when transporting short distances, the oxygen cylinders are forced down and then rolled along the ground; the vehicles are not fixed during transport, the cylinders collide with each other, and they are pushed directly downward from the vehicle. . For example, a municipal oxygen plant uses an automobile to transport oxygen cylinders to a company. When unloading, the oxygen cylinder is pushed down and hits another cylinder, causing two cylinders to explode at the same time.

6. Overloading. Oxygen bottle overfilled during filling due to a violation of operating procedures or operational errors caused the pressure in the bottle to rise and exceed its allowable stress, eventually resulting in excessive plastic deformation and explosion.

(b) The safe use of oxygen cylinders should comply with the following points:

In order to ensure the safety of oxygen cylinders, the state has successively promulgated regulations and standards such as "Cylinder Safety Supervision Regulations," "Dissolved Acetylene Gas Cylinders Safety Supervision Regulations," "Permanent Gas Cylinders Filling Regulations," and the design and manufacture of oxygen cylinders. Scientific, explicit regulations have been made for inspection, filling, and use.

1 . The used oxygen bottles must be manufactured by the national designated manufacturers. The new bottle must have a certificate of inspection issued by the certificate and boiler pressure vessel safety supervision department.

2 . The oxygen cylinder must be inspected periodically as required. Expired cylinders are strictly prohibited.

3 . The oxygen cylinder must not be in contact with grease. Operators should not wear excessively oily work clothes. Do not touch oxygen cylinders and their accessories with hands, oil gloves, and oil tools.

4 . Oxygen cylinders should be kept away from flammable and explosive materials and away from open flames and heat sources. The safe distance for use should be more than 10 meters, and should not be less than 3 meters away from acetylene bottles, and can not be stored in the same room.

5 . Oxygen cylinders are used in winter. If the bottle valve or pressure reducer freezes, it can be thawed with boiling water or steam, and it is prohibited to bake with open flames.

6 . The oxygen in the oxygen bottle is not used up. It is required to retain the residual pressure above 0.1 MPa to prevent other gases from flowing back into the bottle.

7 . When working in the same place as the welder, in order to prevent the cylinder from being charged, insulation pads should be added to the bottom of the bottle. The pipeline equipment that comes into contact with the gas cylinder should be equipped with a grounding device to prevent fire and explosion caused by static electricity. When performing welding work at the same site, the oxygen cylinder must be insulated and the gas cylinder should not be electrically conductive.

8 . Before installing the regulator, open the bottle valve to blow off the dirt from the mouth of the bottle. The opening of the bottle valve should be gentle and people should stand behind the side.

9 . During open air operations and transportation in summer, oxygen cylinders should be shaded to prevent exposure and to avoid overexpansion due to gas expansion.

10 . The status of the oxygen cylinder should be checked at all times and the shockproof aprons should be intact. To protect the bottle valve, bottle caps must be assembled for transportation and storage.