Performing welding work on the outer walls of equipment such as pipelines, storage tanks, and towers, in order to check the gas content inside these devices
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When working with open flames on the outer walls of equipment such as pipes, storage tanks, and towers, gas analysis is carried out within 10 meters of the point where the work is being done. Why is it still necessary to check the gas concentration inside the equipment?
There may be ditches within 10 meters, along with accumulated flammable materials, so testing is necessary
In the case of hot work carried out under pressure without gas displacement, it is sufficient to pay attention to the pressure inside the pipeline; there is no need to test the gas concentration. If it is at atmospheric pressure, attention should be paid to the oxygen content inside the equipment.
It may be because there could be flammable gases inside the equipment, and working on the outer wall of the equipment could lead to an accident inside it
To prevent the combustible gases inside the equipment from expanding due to heat or from being released as a result of improper operation during welding on the outer wall, which could lead to combustion or explosion, it is best to fill the equipment with an inert gas and ensure that the concentration of flammable and explosive gases remains below the specified limits, thereby enhancing the level of safety protection
“When performing hot work on the outer walls of equipment such as pipes, storage tanks, and towers, gas analysis should be carried out within 10 meters of the area where the hot work is being done; at the same time, the gas concentration inside the equipment must also be checked； When performing hot work in the environment surrounding equipment and pipelines, gas analysis should be conducted within a 10-m radius of the hot work site ； ” The first phase involves equipment maintenance, during which pipes, storage tanks, and towers are opened ； In the latter stage, the production and operation equipment is not turned on.
If hot work is carried out under pressure without displacement, I believe it should be classified as high-risk hot work. If it is at atmospheric pressure, attention should be paid to the oxygen content inside the equipment.