Definition - What does Insulation Jacket mean?
An insulation jacket is an outer boundary layer used to serve as the primary protective layer that is adhered to a corrosion prone metal surface to prevent its direct contact with corrosion causing agents such as water or other chemicals and/or to provide thermal protection.
Corrosionpedia explains Insulation Jacket
Insulation jackets are manufactured from a variety of protective substances, primarily metal. The use of other metals as sacrificial anodes to protect the base metal is referred to as metal jacketing. It is used to impede the flow of free energy and ions, keeping the base material dry and free of damage. Special jackets may also be designed to provide fire protection.
Substances that are commonly used for insulation jackets include stainless steel, aluminum and corrugated sheets, and nonmetallic materials such as thermoplastics and fabrics.