The arrival of winter also adds many difficulties to pipeline construction, especially in Northeast China, where a long period of subzero will lead to many pipelines freezing, bursting and damage. Therefore, thermal insulation measures should also be taken during pipeline construction, especially for the steel mesh skeleton polyethylene composite pipe commonly used now, thermal insulation is not required in the south where the temperature is relatively high, but it is necessary in the north.

Thermal insulation measures shall be taken for winter construction. Thermal insulation measures must be taken for composite pipes buried in frozen soil areas, and the buried depth should not be less than 0.5m. The buried depth of the pavement shall be more than 0.8m before passing. Indoor and outdoor open jackets, if frozen, should take thermal insulation measures.

The indoor exposed laying and non directly buried hot water pipes of the steel mesh skeleton polyethylene composite pipe shall be insulated. At the same time, the delivery temperature of the composite pipe shall not exceed 60 ℃. When the pipeline may condense or affect the environment, anti condensation insulation shall be used. When laying pipes, if the depth exceeds the freezing line, insulation is required.

When the steel mesh skeleton polyethylene composite pipe needs insulation, the thickness of the insulation material layer shall be determined according to the pipe length, water temperature, ambient temperature, water supply time and operation conditions. Winter weather will bring many problems to the steel mesh skeleton polyethylene composite pipe. First, insulation should be done well. During installation, pressure test and ponding, the steel mesh skeleton polyethylene composite pipe below 0 ° C will be damaged due to freezing.