This Standard provides guidelines for equipment inspections that are designed to ultimately improve the thermal performance or efficiency of the power plant. By following these guidelines, many issues identified during an inspection, upon resolution, will also improve the reliability of the plant. This Standard provides guidelines for equipment inspections of power plants using fossil fuels during shutdown or outage periods. Some portions of this document may be applicable to other types of power plants. This Standard contains a series of sections, each pertaining to specific equipment and/or systems commonly found in power plants. Internal inspections covered in this document are intended to take place when the equipment is in out of service. Each section of this standard can be used independently, and includes recommendations on what to look for during the inspection.