Several things to keep in mind during emergency shutdowns in winter
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Last winter, emergency repairs were carried out due to a malfunction in the installation; it happened during the coldest days, with temperatures as low as minus 13°C. The total time required for shutting down operations, carrying out repairs, and fixing the heat exchangers was 6 days. A plan for preventing freezing was developed before the shutdown, along with key control points... and so on. But once the emergency repairs began, no one paid any attention to that plan – they simply signed their names without checking it. That’s why implementing things on-site at such times is the most crucial. When there is no flow of medium in the equipment and pipelines, it is crucial to ensure proper drainage at the lowest points. All control valves and drain points, as well as the lowest points of the pipelines and equipment, should be used to drain any remaining water – do this 3 to 5 times, and then there will be basically no problems with these pipelines. Before starting work, just test the following. Please point out any shortcomings.
During an emergency shutdown, special attention must be paid to the on-site implementation to ensure that the pre-established anti-freezing inspection plan is carried out. Attention should be paid to the drainage of condensate when the medium in the equipment and pipelines is not flowing; it is necessary to ensure that all control valves, drainage points, as well as the lowest points in the pipelines and equipment are free of moisture. Draining should be repeated several times to guarantee safety, and a test run should be conducted before starting operation. .
How should long-term shutdowns be handled? Especially for equipment like steam generators, and also how can pumps be protected from freezing?
Keep the heat tracing on unless it needs to be turned off; otherwise. . . If shutdown is necessary, purge the pipes/equipment thoroughly and drain from the lowest point. Do not install plug seals or close valves after draining the drain points of the water pipes and pumps
Empty and dry the small cooler built into the device.
It’s been half a year since I posted that
We want to know if the equipment has been damaged by freezing