It is no surprise that equipment located near the turbine exhaust typically demands more frequent maintenance and repairs. The high operating temperatures up to 1200°F and gas flow causes wear on the material creating overheating issues that could lead to premature equipment failures or exhaust leaks. The A042 transition diffuser duct is an area that is typically exposed to these leaks and potential damage.

The A042 diffuser duct, located between the Flex Seal and the HRSG inlet, requires insulation covered by thin gauge stainless steel liner plates. Hundreds of studs are welded to scallop bars to secure the liner plates while allowing them to expand and contract during cycling. The scallop bars and studs are imbedded in dense high-temperature insulation for added protection.