336A4940CTP2 | General Electric Rack Case

Casings can be inspected during any outage or any shutdown when the unit enclosure is cool enough for safe entry. The exterior of the inlet, compressor case, compressor discharge case, turbine case, and exhaust frame can be inspected during any outage or period when the enclosure is accessible. The interior surfaces of these cases can be inspected to various degrees depending on the type of outage performed. All interior surfaces can be inspected during a major outage.
• Exhaust diffusers can be inspected during any outage by entering the diffuser through the stack or Heat Recovery Steam Generator (HRSG) access doors. The flow path surfaces, flex seals, and other flow path hardware can be visually inspected with or without the use of a borescope. Diffusers can be weld-repaired without the need to remove the exhaust frame upper half.
• Inlets can be inspected during any outage or shutdown. As an alternative to on-site maintenance, in some cases plant availability can be improved by applying gas turbine modular replacements. This is accomplished by exchanging engine modules or even the complete gas turbine with new or refurbished units