Antifreeze - Insulation

Anti-freezing and anti-condensation measures for the plant: Anti-freezing and anti-condensation measures in winter are essential means to ensure safe production. To prevent any occurrence of freezing or condensation incidents, these measures should be carried out in accordance with the principle of \"prevention first, elimination as a supplement\", taking into account the characteristics of the plant. Strengthen the receipt, delivery, use, and management of items that are prone to freezing or solidifying, and abide by relevant rules and regulations in order to ensure safe production. The specific measures are as follows: (1) Before winter arrives, conduct a thorough inspection of the equipment to prepare it for the winter period, such as providing insulation and steam heating for equipment and pipelines, checking whether there are any dead corners in the equipment, pipelines, and valves, and ensuring that the drain valves function properly. Also, take care of doors, windows, glass, and heating systems. (2) Equipment and pipelines that are taken out of use in winter must first be cleaned with steam; for those that cannot be cleaned with steam, the drain valves at the lower positions must be opened to remove any accumulated water. (3) For equipment that is temporarily shut down in winter, it is necessary to ensure a slight flow of return water or steam to prevent the pipelines from freezing. (4) During winter operations, the steam lines, the feedwater and return water lines, as well as the steam traps on the heat tracing lines should have their valves slightly opened depending on the temperature conditions, in order to prevent the valves and lines from freezing damage; the steam traps must remain unobstructed and functional. (5) The drain valves or vent valves on the fire steam lines throughout should be slightly opened to allow steam to escape and prevent freezing. (6) For the industrial air and purified air of the equipment, inspection and water cutting operations should be intensified, and the rubber hoses for exhaust steam in various locations should be connected to the sewer for condensate discharge. (7) If it is found that the valve has frozen and will not open, especially in the case of cast-iron valves, it is prohibited to strike it with a wrench or other tools. Instead, the valve should first be closed, then warmed up using steam (or water) before attempting to open it again. (8) During winter, the heat tracing lines of all pipelines must always be supplied with steam and water to ensure smooth operation. For the condensate pipes leading to the atmosphere and the drainage valves, a method of minor steam and water discharge should be employed. (9) When the plant is shut down for winter due to a lack of steam and water supply, air should be used to thoroughly purge all steam and water lines, isolate them from the main pipelines outside the plant, or drain them at an appropriate location. (10) During the winter shutdown period, all heating equipment, pipeline trace heaters, and steam systems should generally continue to receive a small amount of steam supply, while all coolers and cold water systems should also continue to have a slight flow of water to keep the pipelines unobstructed and prevent them from freezing. (11) In winter, the degree of steam and water drainage can be adjusted according to the time of day – morning, noon, or evening – as well as the temperature conditions; regular inspections are necessary, as there is no one-time solution that will suffice forever. (12) When a problem is detected with the instrument bypass heater, notify the instrument maintenance team promptly to handle it. (13) Strengthen routine inspections to prevent freezing, ensure smooth operation, and maintain safe production. (14) To prevent the medium inside the standby pump from freezing, the following methods should be adopted: a) Close the inlet and outlet valves, open the vent valve and the drain plug on the pump body, and drain all the liquid accumulated inside the pump. b. Slightly open the bypass valve of the pump outlet check valve and open the pump inlet valve; this allows the fluid from the pump in use to flow back through the standby pump body to prevent freezing.