This research report, sponsored by the ASME Center for Research andTechnology Development, has been issued in an effort to comply withthe advances in equipment design and lay-up technology. Topicscovered include: Factors to be Considered; Identification ofMaterials in Equipment; Use and Disposal of Lay-up Chemicals;Boiler Lay-up: Fireside; Lay-up of Turbine Oil System; Lay-up ofAuxiliary Components and Pre-boiler Systems; Conclusions, Glossaryof Terms, Tables, Figures and References; Reasons for Lay-up;Inspection and Cleaning of Equipment; Boiler Lay-up: Waterside;Steam Turbine, Turbine Condenser and Reheater Lay- up; Lay-up ofFeedwater Heaters and Deaerators; Lay-up Monitoring andMaintenance; Start-up After Lay-up.