What safety matters should be paid attention to when checking nitrogen water precooling system?

For the maintenance of nitrogen-water precooling system, the most important thing to pay attention to is to prevent the occurrence of nitrogen suffocating accident. There have been several lessons that maintenance workers died of nitrogen suffocating in China. During the overhaul, nitrogen is often used to warm the unit at the same time, and the heated nitrogen often flows into the cooling tower through the three-way valve of dirt and nitrogen, causing the nitrogen concentration in the tower to be too high.

Therefore, before heating the device, the air cooling tower and water cooling tower should be separated from the device by blind plate; the oxygen content in the air cooling tower and water cooling tower should be analyzed. When the oxygen content is 19% ~ Only between 21% can the maintenance personnel be allowed to enter; if they work in the area where the oxygen content is less than 19%, there must be someone to supervise and wear isolation masks (oxygen respirator, long tube mask, etc ).