Generally, ordinary directly buried prefabricated insulation pipe, when using common insulation materials, can withstand a maximum temperature of around 120 degrees Celsius. Within this temperature range, the insulation material has a stable structure, maintains good insulation and physical properties, and ensures the normal operation of the pipeline. High-temperature resistant directly buried prefabricated insulation pipe produced using special formulas and processes can withstand temperatures up to 150°C or even higher. However, it should be noted that prolonged exposure to extremely high temperatures will accelerate the aging of insulation materials, leading to a decline in insulation performance. It may also affect the performance of the outer protective pipe and steel pipe, shortening the service life of the pipeline. In practical applications, it is necessary to accurately select the appropriate type of directly buried prefabricated insulation pipe based on the temperature of the conveyed medium to ensure that the pipeline operates within a safe temperature range.

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