Piping and Instrumentation Diagrams show piping and process flow, major and minor equipment, as well as all installed instrumentation. PID sets must show all the process equipment, all the connections across the plant, including such things as piping, conveyors, mechanical loading (such as front-end loaders), any other method used to move material, as well as all wiring and loops between them. All instrumentation in use to monitor or control the process is included, as well as any generated numbers used in other plantwide systems (such as stores or accounting).