1. Other types of heat shrinkable distribution are widely distributed, and the pipeline anticorrosion heat shrinkable belts will benefit more obviously. The oil pipeline and heating pipeline are several hundred kilometers long, and each steel pipe is only 12 meters long. The heat shrinkable zone has become the preferred material for anticorrosion protection of pipeline joints. China's nuclear island heat shrinkable materials are now provided by the United States, and the space of heat shrinkable materials localization is larger. The amount of heat shrinkable material used for a nuclear island is 10 million yuan, and the volume of a conventional island is 2 million yuan.