The cooling process for hot-dip galvanized steel pipes consists of two parts: air cooling and water cooling. The details are as follows:
Air Cooling Process
Air Cooling Time: 20 to 40 seconds;
Conveyor Speed on Cooling Bed: 0.126 to 0.254 meters per second;
The air cooling time should be adjusted to a higher value in summer and a lower value in winter. Conversely, the conveyor speed on the cooling bed should be slower in summer and faster in winter. It is essential to avoid any scratching of the galvanized surface on the cooling bed.
Water Cooling Process
Cooling Water Temperature: 50 to 80°C;
Cooling Water pH: 6.5 to 8;
Cooling Water Chroma: <15 degrees;
Turbidity: <5 degrees;
Odor: Must be free from abnormal odors;
Cooling Time: 10 to 20 seconds;
The cooling water should be replenished by introducing water at one end and discharging it at the other. After each production cycle, the tank should be thoroughly cleaned to maintain cleanliness.
