Storage and safe operation of high pressure gas cylinders

(1) The gas cylinder must be stored in a cool, dry, away from heat source, and open flames should be strictly prohibited. Except for non-combustible gases, they are not allowed to enter the laboratory building. The cylinder in use should be fixed upright.

(2) The color of the cylinder and the steering of the valve

In order to ensure safety, the gas cylinders are color-coded so that various cylinders are not misplaced or mixed. At the same time, in order not to confuse the accessories, the various cylinders are different in nature and the valves are turned differently.

General: The cylinder is red and turn left. Toxic gas (cylinder is yellow), non-combustible body turn right.

Compressed gas cylinder color valve steering list

(3) Storage of gas cylinders

1 The gas cylinder should be stored in a cool and ventilated place. It should not be too cold, overheated or hot or cold, causing the bottle to deteriorate. It can't be exposed to sunlight and all heat sources. Because of the heat, the strength of the bottle wall may be weakened, the gas inside the bottle will expand, and the pressure will increase rapidly, which may cause an explosion.

2 Near the gas cylinder, there must be no reducing organic matter, such as oily cotton yarn, cotton cloth, etc., do not use plastic cloth, linoleum and the like to avoid explosion.

3 Do not put it in the channel, so as not to fall.

4 Do not use the gas cylinders in the laboratory, there should be a special library to save.

5 different cylinders can not be mixed. Empty bottles and bottles containing gas should be stored separately.

6 In the laboratory, do not put the cylinder upside down or lying down to prevent the compressed liquid from being sprayed when the valve is opened. To be firmly erect, fixed to the edge of the wall or to the side of the test table, it is best to fix it with a fixed frame.

7 When receiving the gas cylinder, use soapy water to test the valve for leaks. If it leaks, return it to the manufacturer, otherwise it will be dangerous.

(4) Gas cylinder handling

Gas cylinders should avoid knocking, bumping and rolling. Valves are the most vulnerable part and should be protected. Therefore, to handle cylinders, pay attention to the following rules:

1 General requirements:

When carrying the gas cylinder, do not make the cylinder protrude by the side or both ends of the vehicle, and take adequate measures to prevent the cylinder from falling off the vehicle.

Do not disperse during transportation to avoid collisions while the vehicle is in motion. It is not possible to suspend with a magnet or an iron chain, and it can be hoisted with a rope, not more than one at a time. If more than one crane is used for loading and unloading, the brackets are formally designed.

2 When carrying the gas cylinder, the gas cylinder cap should be covered to protect the valve.

3 Avoid using a greased hand, gloves, or rag to contact the handling cylinder.

4 Before handling, remove all accessories such as pressure regulators and rubber hoses that are connected to the cylinder.

(5) Gas cylinder use

1 gas cylinder must be connected to the pressure regulator, after depressurization, and then flow out, do not directly connect the gas cylinder valve to use gas. Do not use the regulators and piping of various gases. Pay special attention to this problem when using oxygen, otherwise explosion may occur. The best accessories and cylinders are painted with the same color.

2 Install regulators, piping, etc., and use them absolutely. If it is not suitable, it must not be forced to match, do not put lubricant on the joint, do not weld. After installation, the test interface can be used without air leakage.

3 Keep the valve clean to prevent grit, dirt or sewage from entering the valve casing and causing air leakage. When cleaning, the experienced person slowly opens the valve and discharges a small amount of gas to wash away the dirt. The operator should be slightly away from the cylinder valve.

4 When the valve is opened, it should be carried out slowly; when the valve is closed, the gas can be cut off and flowed out, and it can be stopped. Do not use excessive force.

5 cylinders, after the pressure regulator, should be equipped with a one-way valve to prevent tempering.

6 The gas cylinder should not be in contact with the electrical wires to avoid arcing, which may cause the gas in the bottle to be heated. If using acetylene gas to weld or cut metal, keep the cylinder away from fire and slag.

7 Before ignition, make sure that the air is exhausted and it can be ignited without tempering. To this end, the gas test is collected in a test tube, such as hydrogen gas, and the collected gas does not explode before it can be ignited.

When using an acetylene torch, it should also be put on for a while to ensure that the torch is not ignited.

8 or corrosive gas, each time the experiment is completed, the connecting tube with the instrument should be removed, do not connect overnight.

9 The gas in the gas cylinder cannot be used up, that is, the input gas pressure gauge should not be zero. Otherwise, air may be mixed in, and the gas to be reinstalled in the future may be dangerous when working.

In the vicinity of the 10 cylinders, there must be a suitable fire extinguisher and the workplace is well ventilated.

(6) Special attention and accident handling

1 The copper salt and silver salt of acetylene are @@@@@@, and the acetylene gas and gas cylinder should not be in contact with copper or alloy containing more than 70% copper. All accessories cannot be used.

2 There should be a safety bottle between the gas cylinder and the instrument to prevent the drug from being sucked into the bottle and danger.

3 If tempering or cylinder bottle heating occurs, immediately close the cylinder valve, move the cylinder out of the outdoor empty mine, and immerse the cylinder in cold water, or pour a lot of cold water to lower the temperature and make the valve slowly Turn on and continue to cool until the gas is discharged.

4 Acetylene, hydrogen, and LPG are the most dangerous.

5 Although oxygen is not flammable, it has strong combustion-supporting properties and must not be exposed to dirt or organic matter.

6 Use corrosive gases, cylinders and accessories should be checked frequently, do not put them in the laboratory when not in use.

(7) Pressure regulator use and operation

The pressure regulator is an accurate instrument. It is designed to reduce the output pressure of the cylinder to a safe range before it is discharged, so that the pressure of the outflow gas is limited to a safe range, preventing any instrument or device from being damaged by overpressure, and the pressure of the gas flow is stable. The good regulator should have the following performance. :

1 cylinder input gas changes pressure, regulator output gas pressure can maintain normal pressure.

2 The pressure regulator does not change the pressure due to the change of the gas output speed, the deviation is small, and the constant pressure is basically maintained.

3 When the work is stopped, the final pressure in the system will not increase.

(8) Method of operation

1 Before connecting with the cylinder, check the regulator inlet and the cylinder valve outlet for foreign objects, if any, with a cloth. However, if it is an oxygen cylinder, it cannot be rubbed with a cloth. At this time, carefully open the cylinder valve slowly and blow away the dirt from the outlet. The dirty oxygen pressure regulator inlet is cleaned with carbon tetrachloride or trichloroethylene, blown dry with nitrogen, and used.

2 Tighten the connection between the cylinder outlet and the regulator inlet with a flat clamp, but do not apply force to the threads. Some cylinders should be padded on the mat between the entrance and exit. When using a Teflon pad, do not use too much force, otherwise the pad will be squeezed into the valve opening to block the gas from flowing out.

3 Loosen the screw in the counterclockwise direction until there is no tension, then close the regulator.

4 Check if the needle valve of the output gas is closed.

5 When opening the gas, first open the valve of the cylinder slowly, and read the full pressure of the cylinder to the input meter. When opening, be sure to fully open the valve and the regulator's output pressure will remain constant.

6 Turn the adjusting screw clockwise to adjust the output pressure to the required working pressure.

7 Transfer the needle valve to adjust the flow rate.

8 When closing the gas, first close the cylinder valve.

9 Open the needle valve and drain the gas inside the pressure regulator. At this point both readings should be zero.

10 Loosen the adjustment screw counterclockwise until no tension and close the regulator.

(11) Close the needle valve of the regulator output.

(9) save

When the pressure regulator is not in use, it should be removed in time to save.

1 The pressure regulator is stored in a clean, non-corrosive atmosphere.

2 Regulator for corrosive gases, rinse immediately with dry nitrogen after use. When washing, open the spiral clockwise, connect with nitrogen, and open into the inlet tube. Rinse for more than ten minutes.

3 Then seal the inlet tube with the original plastic bag and keep it clean.

(10) Pressure regulator inspection

The regulator should be inspected frequently, especially the regulator of strong corrosive gas. It should be inspected once a week, and the other ones can be checked once every two or two months. A good pressure regulator should meet the following technical conditions:

1 Both gauge readings should be zero when there is no pressure.

2 Open the cylinder valve, after adjusting the screw, read the highest pressure of the cylinder.

3 Close the regulator input needle valve. Within five to ten minutes, the pressure of the output pressure gauge should not rise, otherwise the internal valve will have a leak.

4 Turn the adjusting screw clockwise to indicate the normal output pressure. If it does not reach, it indicates that there is a blockage inside, and later the output voltage rises. This is called a slow phenomenon, and the regulator with a slow phenomenon cannot be used.

5 Close the cylinder valve. Within five to ten minutes, the input and output pressure should not change. If it drops, it indicates that there is air leakage, and it may leak in the input pipe, needle valve, safety device diaphragm, etc.

6 During operation, the output pressure drops abnormally, indicating that there is a fault in the table.

Any abnormalities must be repaired before they can be used.

Note: After using any gas pressure regulator, it cannot be used as an oxygen pressure regulator! In principle, each gas regulator cannot be mixed unless the user knows the characteristics of the two gases and determines that they do not react!

YT-88

Shenzhen Sunshine Technology Co.,Ltd , https://www.yatwinsz.com