Thermal spray technology safety warning

       Thermal spraying includes the preparation and potential hazards associated with the spraying process and the safety measures employed in these operations. It is recommended that all personnel involved in thermal spraying should be familiar with the safety regulations contained in these safety measures and standards of the state and relevant authorities.

compressed air

Compressed air should be named to avoid confusion with oxygen or gas. Compressed air should not be used to clean clothes. It is also not possible to clean with oxygen and gas.

noise protection

Spray noise exceeds limits and all personnel in the vicinity of the work area should use hearing protection.

respiratory protection

Spraying operations require the operator to use respiratory protection. Depending on the nature, type and size of the dust gas, what kind of respiratory protection device should be used. Spraying in a limited or sealed space requires the use of a continuous flow channel respirator. It consists of a standard continuous air channel respirator, face shield or helmet and dust cover. To strengthen the protection of the head and neck, at the end of the protective mask, the maximum air intake of the respirator is 4CFM (6.6M3/H), and the air entering the helmet or dust cover is 6CUFT (10M3/H) per minute. Blowing fresh air is better than compressed air as a breathing source.

protective clothing

The proper protective clothing required for any spraying or sandblasting will vary with the type, nature and environment of the job.

When working in confined areas, wear fire-resistant clothing and protective leather or rubber gloves. Clothes should be tied tightly around the wrists and bare feet to ensure that splashed substances and dust do not get on the skin.

When working in an open environment, you can use the usual full coveralls, but do not open the neckline and button the pockets. Wear high-top shoes and cover your feet with your trousers.

When spraying lead or other highly toxic materials in confined or semi-open spaces, change all clothing and respiratory protection daily and before each meal. Lead dust or other toxic materials.

eye protection

The radiation protection used in arc spraying is the same as that used in arc welding. Eyes can be protected with a size 3 or 6 visor, and a helmet should be used if any part of the body is directly exposed to arc radiation or if some special radioactive material or reflective substrate is sprayed.

Equipment maintenance

Hose and air lines should be checked regularly, and equipment found to be defective should be repaired or replaced immediately.

The flame spray gun should be maintained in accordance with the manufacturer's recommendations. Every thermal spray operator should be familiar with the operation of a flame spray gun. Before firing for the first time, the operating instructions for the gun should be carefully read and understood.

Valves that control the flow of oxygen gas or compressed air should be properly installed and lubricated to protect the gun body from operating freely and to be fully closed.

If the gun flashes back, it should be extinguished as quickly as possible. If there is deflagration or flashback when igniting during spraying, the ignition should be re-ignited after checking the cause and solving it.

The flame spray gun or its hose must not be hung from the regulator or cylinder valve, as this may cause a fire or explosion.

When spraying is finished, or when the equipment is shut down and left unattended, all gas should be vented from the regulator and hose, and the following sequence should be followed:

⑴Close the gun valve.

⑵Close the air valve.

(3) Open the gun valve.

⑷ Turn the adjusting screw to the free state.

⑸Close the gun valve.

⑹Close the tank valve or the branch valve in front of the regulator.

When cleaning the flame spray gun, oil is not allowed to enter the gas mixing chamber, and ordinary oil or grease cannot be used for the flame spray gun parts or valves in contact with oxygen or gas. Only use special antioxidant lubricants recommended by the equipment manufacturer.

Operators should always keep in mind the following warnings

(1) High-speed and high-temperature spray jets are harmful to people and equipment.

(2) Spray dust is harmful to health, pay attention to dust prevention and ventilation.

⑶ spray noise may damage hearing, please use earmuffs.

⑷The radiation of spray arc can damage eyesight, please wear goggles [3].