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Rules for entries in the FN numbering data character field The numbering system in the FN data character field of breakdown level 1 has basically the following functions: 1. Subdivision of a process system or facility into different trains (division into units of availability within a system or facility). Please note: This establishes and reflects the parallelism of functions which exists within a system or facility. This demarcation should not be confused with the prefix-based numbering system which is designed to enable reproduction of a unit (a distinct system or facility) within the overall plant. Where the subdivision of a system or facility into trains is regarded as the chief priority, these separate subsystems and facility sections are numbered by the decimal FN character. A "0" (zero) is entered as the final numeric character in the FN data character field. 2. Subdivision of a process system or facility into different sections (vertical division within a system or facility, e.g. in the direction of material flow) where each system section or facility section formed represents a separate functional element in the overall function of the facility or system. If the subdivision of a system or facility into different sections is regarded as a the chief priority, the separate system/facility sections are numbered by the decimal FN character. A "0" (zero) is entered as the final numeric character in the FN data character field. 3. Subdivision of a separate system/facility train into either trains (from the viewpoint of the overall system, the overall facility = sub-trains) or into train sections. If this further subdivision is thought advisable when encoding the facility, the separate subsystems or sections of a system/facility train are numbered by the final numeric character in the FN data character field. The decimal FN character now represents the system/facility train which has been subdivided into smaller units. 4. Subdivision of a separate system/facility section into either sections (from the viewpoint of the overall system, the overall facility = sub-sections) or into section trains. If this further subdivision is thought advisable when encoding the facility, the separate subsystems or subsections of a system/facility section are numbered by the final numeric character of the FN data character field. The decimal FN character now represents the system/facility section which has been subdivided into smaller units.

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