A method for producing insulated pipes and a pipe using the method of producing the heat-insulating

A method of producing pipe insulation provided by the present invention, the use of composite plastic pipe as the outer protective tube, said conduit comprising at least one layer of composite plastic outer jacket and at least one composite plastic pipe for preventing the internal gas and / or the external environment gas and water through the outer jacket and the circulation of the barrier layer, when the external environment into the gas or moisture permeation through the outer protective barrier layer, the barrier layer is blocked to live, so that the outside air or moisture can not continue flow, reducing the environmental influences on other structures or within the duct inside the pipe conveying the medium; Further, when other structures within the plastic pipe comprises may also affect its performance due to the presence of a gas permeable plastic pipe, the composite plastic pipe barrier layer may can function as barrier gas permeable composite plastic pipe, thus ensuring the performance of other structures within the composite plastic pipe.