Sharing of winter anti-freezing experiences: centrifugal pumps

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Sharing winter anti-freezing tips: Centrifugal pumps operate in a cycle throughout the year, and now that winter has arrived, even a drop of water turns to ice. Although it takes time for ice to build up to such a thickness, in the case of centrifugal pumps, with their relatively small pump chambers, if freezing occurs, the pump casing and seals can easily be damaged. I remember that one year, towards the end of the maintenance work before winter arrived, the weather forecast predicted a cold wave moving southward, with temperatures dropping below zero at night. I didn’t pay attention at the time; it seemed like the weather was just getting a bit cooler, but there was still a certain amount of soil warmth, so I thought there wouldn’t be any problem. But judging from the results, this was to be expected; upon inspection the next morning, the pump casings of several pumps had frozen and cracked. That night, the temperature gradually dropped, and so did the temperature inside the pump. For less than an hour, the temperature fell below zero degrees, causing the water inside the pump to freeze and crack the pump casing. Any problems that arise must not be ignored; the principle of \"four no-lets-go\" must be strictly followed, especially ensuring that corrective measures are implemented. For pumps that will not be used before winter arrives, blind flanges should be installed at the inlet and outlet ports. The plug at the bottom of the pump chamber should be removed and stored separately, and all liquid inside the pump chamber must be drained completely, followed by drying it with compressed air. For each stage of the multi-stage pump, the plug must be removed to drain the liquid, and then it should be dried with compressed air. Therefore, it is necessary to ensure proper insulation and heating for the backup pump. The size of the heat tracing is adjusted via on/off control in response to temperature changes. Despite the cold weather, inspections are essential. Winter inspections are difficult due to harsh conditions; it is essential to be thorough and careful during such inspections. Especially the inspection of the freezing point.