The issue of preventing freezing
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Problems of anti-freezing for cleaning lines and fire protection lines at various branches on the towers in the heavy oil workshop during winter
The steam pipelines at these steam service points usually come equipped with dedicated traps; it is important to check them regularly and address any issues promptly. For valves at the steam service points on the tower that have internal leaks, it is best to replace them as soon as possible. If that isn’t feasible, then vent the pressure on-site, install a flexible joint on the belt, and connect it temporarily when in use, in order to prevent the belt from being damaged by freezing.
Install steam tracing and wrap it with insulation material; pay attention to regular inspections, and address any freezing damage promptly.
What I mainly emphasize is how to prevent freezing when various branches are connected to the main line
Key points for freeze protection in winter: When operating in winter, the main concern is preventing equipment and pipelines from expanding due to the low temperatures around them, which could lead to production disruptions and malfunctions of control devices. To address this, the following points should be taken into consideration: 1. Install insulation boxes for instruments in areas where it is necessary. 2. Identify the dead ends in the pipeline and take measures to prevent freezing and cracking. 3. Use insulation materials to enhance the device’s insulation. 4. Carefully monitor the operation of the equipment to prevent freezing in pipes and equipment, and take measures in areas where freezing is possible. 5. Strictly prevent leaks in equipment and pipelines, as freezing is likely to occur at the leakage points, affecting the normal operation of the system. 6. In the event of a stoppage or accident, as long as the entire system has not been completely shut off and water has not been fully drained from the system, steam supply must be maintained. 7. Some pipelines without heat tracing may freeze during shutdown; therefore, all liquids and water must be drained within half an hour after shutdown, taking care to handle the discharge of toxic liquids. 8. When the surrounding air temperature is below zero degrees, the heating of the equipment and pipelines must increase by 25°C per hour once the device is started up; at this time, the temperature difference between the inlet and outlet of the equipment should not exceed 100°C. 9. When pressurizing the device during startup, the pressure must be increased gradually – 0.25 times the operating pressure can be applied in the first hour, with an additional 0.25 times the operating pressure added every 15 minutes. It is crucial not to increase the pressure too quickly.