Methods for pipeline insulation and moisture protection layers
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Hello everyone. When insulating pipes, a moisture barrier needs to be installed on the outer surface of the insulation material. What materials should be used for this moisture barrier, and what is the specific method of implementation? Are there any relevant standards?
Generally, only insulation and protective layers are used, with no moisture-proof layer.
Just now it was said that insulation is necessary to prevent moisture from entering, but in the case of heat retention, if the temperature of the pipes is high, any water that enters can evaporate, so it’s not a big problem. However, when the temperature of the equipment and pipes is below 120°C, the water vapor trapped in the insulation layer cannot be removed, which leads to severe corrosion beneath the insulation layer; stainless steel pipes are particularly susceptible to the accumulation of chloride ions. There is a specific type of corrosion known as Corrosion Under Insulation (CUI).
The structure of the moisture barrier is as follows: the first layer is a waterproof cold adhesive layer or a flame-retardant petroleum asphalt adhesive layer, with a thickness of 3 MM； The second layer is wax-free alkali-resistant coarse-grid plain-weave glass cloth, with a thickness of 0.1–0.2 MM ； The second layer is a waterproof cold adhesive layer or a flame-retardant petroleum asphalt adhesive layer, with a thickness of 3 MM ； Requirements: (1) The outer surface of the insulation layer where the moisture barrier is installed must be clean, dry, smooth, and uniform; there should be no sharp corners or pits. (2) When applying the waterproof cold adhesive layer or flame-retardant petroleum asphalt adhesive layer directly to the insulation layer, once the designed thickness is reached, it should be smoothed evenly with a trowel. And immediately wrap it with wax-free, medium-alkali, coarse-grid plain-weave glass cloth. (3) The glass cloth should be wound in a spiral pattern, with an overlap length of not less than 50 MM; it must be tightened, smoothed out, and pressed firmly so that no wrinkles appear.
What kind of working conditions? It only provides temporary relief, not a permanent solution. Find the source
Where did you find out about this method?
Conventional insulation does not require a moisture barrier, while buried insulation pipes and cold-insulation pipes do. Let’s take a look at the actual situation; you can also refer to the answers from other travelers above
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