BDL cold insulation pipe can solve the problem of supporting all cryogenic pipelines, including liquid methane, propane, LNG, oxygen and nitrogen etc.. The cold insulation material is rigid polyurethane, which is light weight, high hardness and high strength, and the service temperature can be as low as -196 C. The cold proof block is designed by multi-step steps, avoiding the interlocking connection of cold insulation materials between adjacent pipelines, and preventing the surface of insulation directly on the wet channel. In the case of tight distribution of the pipe, the clamp can be welded at 45 or 30 degrees as required to ensure the installation. The iron substrate by hot galvanizing or cold zinc spraying treatment, good corrosion resistance, beautiful appearance, service life of up to 30 years.