CORROSION PREVENTING STRUCTURE FOR VACUUM INSULATING PIPE

摘要

PURPOSE:To prevent the occurrence of corrosion and the stress corrosion crack of a membrane, in a vacuum insulating pipe having a vacuum insulating layer the end part of which is sealed by welding it to a thermal expandable membrane. CONSTITUTION:A membrane 1 is previously solidified and annealed and a silicone coating material film 12 is formed on the membrane 1 and weld parts 10 and 11 between the membrane 1 and inner and outer pipes 2 and 3.