The term "Exhaust Riser thermal jacket" typically refers to a protective covering or insulation designed to manage heat in the exhaust riser of a marine engine. The exhaust riser is the section of the exhaust system that connects the exhaust manifold to the exhaust pipe or stack, and it is responsible for routing and expelling the engine's exhaust gases.

The thermal jacket, also known as a thermal wrap or insulation blanket, is specifically designed to wrap around the exhaust riser. Its primary purpose is to provide insulation and prevent excessive heat transfer to the surrounding environment. By minimizing heat dispersion, the thermal jacket helps maintain a higher temperature within the exhaust gases, which aids in more efficient emission control.

The jacket is typically made of materials that can withstand high temperatures, such as heat-resistant fabrics or insulation materials. These materials not only provide thermal insulation but also offer protection against potential burns or accidental contact with the hot exhaust surface.

The use of an exhaust riser thermal jacket can help improve engine performance, reduce heat-related issues, and enhance overall safety in marine applications. It is especially important in vessels where the exhaust riser is located close to sensitive components or areas that can be affected by excessive heat.