Before starting operation in anoxic environment, all respiratory protective equipment and rescue equipment must be checked to ensure that the equipment can be used effectively. The concentration of harmful gas must be determined before operation, and the operation can only be carried out after the air quality reaches the standard. If welding operation is carried out in a confined space, the workplace must be ventilated, or isolation breathing protection equipment must be used.
When working in a confined space, it shall be carried out in accordance with the provisions of 5.3.3 in GB8958-2006 Safety Regulations for Dangerous Operation in Hypoxia.
Summarize the knowledge points of the construction engineer examination chapters, and wish you easy evidence collection.
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