Pre insulated pipe is suitable for conveying medium temperature not higher than 120℃(Accidental peak≤130℃) , which shall be operated at least 30 years under 120℃.
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It is usually used on pipelines with large diameters. Usually, the pipeline is kept open at the end of the flange, and if necessary, it is replaced with a blind plate of the same thickness at the other end to cut off the pipeline.