Condensation refers to the phenomenon that the surface temperature of the object is lower than that of the air around it, result in water condensation on the surface. Generally speaking, the air we refer to is wet air. Wet air is air containing water vapor, a mixture of dry air and water vapor. The saturated vapor content of wet air is proportional to the temperature of the air. The higher the temperature, the more water vapor can be contained. Similarly, even if the wet air itself does not reach supersaturation, when objects, voids, surfaces and interiors in contact with the wet air are cooled below the saturation temperature of the wet air, the water vapor contained in the air near its interface condenses into water and becomes water droplets. Condensation occurs in water supply pipes and can aggravate corrosion of steel pipes.
How to prevent condensation in the water supply pipeline? How much is the "rubber foam insulation thickness" of the water supply pipe, spray pipe and fire hydrant pipe in the pump room in cold and cold regions? The answer is 10mm or 15mm, which is just a standard for preventing condensation. It can't keep warm and prevent freezing. Then why is it so thin? Because there are generally heating facilities in the pump room, or there is no problem of freezing and freezing in the pump room, it is only necessary to make 10mm thick anti-condensation for the water pipe. Hydrant pipe and spray pipe can be done or not do anti-condensation treatment if the indoor water pipe has the risk of frost crack, then electric heat insulation is necessary, only by thickening insulation layer is impossible to play the role of anti-freezing! Note: There is no need for electric heat tracing in the hot water pipeline. It only needs to be treated by thickening heat preservation thickness to reduce heat loss.
For indoor fire hydrant, wet spray system section is not equipped with thermal insulation material, because indoor heating, there exists no problem of antifreeze, stagnant water will not cause condensation problems in section, and the drainage pipe and feed pipe is to prevent condensation process, general 10 mm or 15 mm thick B1 level plastic foaming can, even in the indoor heating, or outdoor.
For larger at a higher temperature, air humidity environment (such as kitchen, laundry room, and some raw factory workshop, etc.) or the pipe when the water temperature is less than the indoor temperature, may produce the condensate pipe surface, causing corrosion influence use and health, therefore the pipeline process engineers must adopt measures to prevent condensation, it is generally the same as the practice of heat preservation.