People may encounter various unexpected safety problems in the leak detection work of the air tightness detector, and a slight negligence will lead to personal and equipment safety accidents. Therefore, special attention should be paid to safety in leak detection. Explain some safety operation rules and preventive measures that should be observed in leak detection.

一、 Requirements for leak detection personnel

1. The leak detection personnel shall attach great importance to safety

The application of leak detection technology is very wide, and the working conditions are different, so there is no complete set of safe operation procedures that can be applied to all leak detection occasions. In order to protect the personal safety of themselves and the surrounding personnel, the leak detection personnel should be clearly aware of the danger of the work, receive appropriate training, attach great importance to the existing safety operation procedures, and pay attention to various safety problems in the operation according to the actual situation of the leak detection. In many cases, leak detection needs to be carried out under harsh conditions. In addition to mastering professional skills in leak detection, it is necessary to keep a clear head and give priority to safety under any circumstances.

2. Leak detection personnel shall receive safety training

Only through training can the leak detection personnel have a correct understanding and attitude towards safety issues. In addition to the factors that may cause various hazards during leak detection and the degree of harm, the training shall also include preventive measures for various hazards and first aid and life-saving techniques. Only after training can the leak detection personnel be familiar with the characteristics of toxic, flammable, explosive and corrosive dust, liquid or gas, and the methods of using and storing these harmful substances, can they learn the first aid methods to deal with emergencies. Only through training can they have the ability to deal with safety problems.

3. Leak detection personnel shall strictly abide by safety production rules

The leak detection personnel shall ensure safe production and strictly implement the safety production rules formulated by relevant departments.

二、 Safety measures for using leak indicating gas in leak detection

In terms of safety of leakage indicating gas, in addition to the possibility of pressure vessel explosion, such as flammability, asphyxia or special physiological effects should be considered. As long as the leak detection technicians are familiar with these safety measures, it is possible to detect the leakage of a container at a small cost.

Helium is widely used as a leak indicating gas in helium mass spectrometer leak detection. It is a light member of the noble gas family, and is a chemically inert, colorless, odorless gas. Helium is non-toxic, but it can also cause asphyxiation when it displaces the amount of air needed to sustain life. Due to its low density, helium tends to rise to the top of closed containers or enclosures, which will cause asphyxiation of personnel working at these heights. Therefore, pay close attention to the helium leakage of the helium device.

三、 Safety measures for transportation and storage of compressed gas cylinders

Most of the gases used in leak detection are contained in steel cylinders, which are manufactured and stored in accordance with relevant laws and regulations, and their capacity will be clearly marked on each cylinder in capital letters.

Many serious accidents are caused by misuse, abuse or misuse of compressed gas cylinders. The managers of compressed gas cylinders should work carefully under full supervision. Compliance with the regulations will help control the management risks of compressed gas cylinders.

1. Only approved steel cylinders are allowed to carry compressed gas.

2. The number or mark printed on the cylinder cannot be removed or changed.

3. Unless a protective cap is installed on the cylinder, the cylinder is never allowed to move. Because of the shape, smooth surface and heavy quality of the cylinder, it is very dangerous to move the cylinder by hand. When they are moved without a car, some kind of handling tool should be used. The cylinder can roll by the tilt of its bottom, but it must not be dragged.

4. Protect the cylinder from cutting and scratching.

5. Do not use electromagnet to lift the compressed gas cylinder. When it is necessary to lift the steel differential to a higher experimental place, a crane or tower crane is required. Use a cylinder trolley or similar device to handle them, and be very careful to ensure that they do not fall.

6. The cylinder shall not fall down or strike other cylinders violently.

7. Cylinders shall not be used as drums, supports or for any purpose other than gas filling.

8. The valves and safety devices on the steel cylinders shall not be manipulated at will.

9. In case of any doubt about the correct control of the compressed gas cylinder or its content, the gas supplier shall be consulted in a timely manner.

10. When the empty bottle is returned to the seller, the words "empty" and marks shall be marked with chalk, the valve shall be closed and the valve protection valve shall be reinstalled.

11. Transport a large number of steel cylinders within the smallest possible range of activities, but protect the cylinders from violent impact or overturning.

12. After starting to think that steel cylinders are full and managing them with considerable attention, if it is found that there is only partial pressure or empty, leakage has occurred.

13. The safety chain shall be used to protect the cylinder during use to prevent accidental fall of the cylinder.

四、 Safety routines for using compressed gas cylinders

1. Use cylinders in the upright position and protect them from accidental toppling.

2. When the cylinder is not in use, the metal web shall be sleeved on the head of the cylinder protecting the valve. A blow on an unprotected valve may cause the escape of high-pressure gas.

3. Check the thread of the pressure regulator, and do not force it to connect with the inappropriate thread.

4. The valve of the cylinder shall be opened slowly, and the valve of the cylinder without handwheel shall be opened with a wrench or other tools provided or agreed by the gas supplier.

5. Compressed gas cylinders without pressure reducing regulating valves connected to the cylinders shall not be used.

6. In addition to the hydrogen cylinder, before connecting with the outlet end of the cylinder valve, hit the valve suddenly to remove the dust and dirt particles at the upper port of the valve. It should be emphasized that the valve opening should not face anyone, and the operator should wear safety glasses.

7. Only regulators and pressure gauges suitable for this kind of gas can be used, because these regulators and pressure gauges are designed and conceived according to this kind of gas. Do not attempt to repair or change cylinders, valves or accessories. The repair or change work can only be completed by the manufacturer.

8. When there is air leakage between the cylinder and the regulator, the cylinder valve should be closed first, and the method of tightening the nut should not be used to prevent it.

9. Heavy objects, sparks, molten metal, current, waste heat or flame are not allowed to enter into contact with the cylinder or accessories.

10. It is not allowed to take gas cylinders into containers or unventilated rooms.

11. Except with the consent of the cylinder owner and in compliance with the corresponding regulations, the cylinder shall not be inflated, gas mixing in the compressed gas cylinder shall not be attempted, or the cylinder shall be used to do other things that are not allowed by the supplier.

12. Use a wrench of appropriate size to fix all measuring meters and rubber pipes, and do not use vises.

13. Do not over tighten the threaded fasteners on the cylinder accessories or damage the thread teeth.

五、 Safety precautions for using valves or regulators on cylinders

In order to maintain the uniform supply of gas, a regulating valve or a pressure reducing valve shall be used on the gas cylinder. When opening the valve on the cylinder, the technician should stand aside and leave the pressure gauge dial of the regulator. Always wear safety glasses to avoid the eyes from being attacked by the ejected particles. Each regulator shall be equipped with a high pressure gauge (indicating capacity) and a low pressure gauge (indicating working pressure).