HRSGs and many styles of Waste Heat Boilers have an internal Liner & Insulation system to protect the outer casing from the hot exhaust gas.  If the internal Liner & Insulation system fails many problems will occur:  casing overheat and buckling, hot exhaust gas leaks, and insulation fouling of finned tubes and catalyst systems.  Therefore, proper design and maintenance of Liner & Insulation Systems is critical.  A small design or installation problem can quickly turn in to a big problem when exposed to 100+ mph exhaust velocities at 1100 °F.

HRST can help you repair or upgrade your Liner & Insulation System.  We will review your problem area and offer the proper design, and installation technical advisor support.  We offer kits of materials custom designed for your application.  Contact us so you can make repairs correctly the first time!!

The illustration below shows a liner and insulation system.  A long lasting repair requires proper selection studs, washers, insulation, liner sheet size and thickness, and these depend on the shape, temperature and exhaust velocity conditions of your problem area.  Also critical is design layout and the installation quality. 

Above:  Before and After an HRST upgrade of Firing Duct liner & insulation system.  Upgrade included better grade materials, better stud design, new plate sizes, installation drawings and on-site technical advisor during installation.

Above:  White marks indicate liner probems (left).  Avoid these with an HRST design and a happy HRST Technical Advisor (right).