PD object classes

There are different PD object classes. Each object class is linked to a table, the name of which is written in capital letters.

P&I diagram (table PI_CATALOG)

P&I diagrams are at the top of the hierarchy. The data of P&I diagrams is stored in the table PI_CATALOG so P&I diagrams are linked to the PI_CATALOG table.

System (SYSTEMS)

Systems are grouping objects. Pipelines, instrument tags and equipment always belong to some system. System is linked to the SYSTEMS database table and to a DG group. Systems are common with Plant Modeller—see Systems and Lines.

One system (DEFAULT_SYSTEM) is always present.

Pipeline (PIPELINES)

A pipeline is a group of pipe runs and armatures. Pipeline is linked to the PIPELINES table and via that to the SYSTEMS table. Pipeline is linked also to one DG group.

One pipeline (DEFAULT_PIPELINE) is always present, and piping objects are assigned into it by default. The default pipeline references DEFAULT_SYSTEM. See Systems and Lines.

Instrument tag (TAGS)

An instrument tag is a group of instrument lines and instruments. Instrument tag is linked to the TAGS table and via that to the SYSTEMS table. Instrument tag is linked also to one DG group.

One tag (DEFAULT_TAG) is always present, and instrument objects are assigned into it by default. The default tag references DEFAULT_SYSTEM.

Equipment (EQUIPMENTS)

An object of this class is linked to the EQUIPMENTS table and from there to one of the sub-tables (e.g. PUMPS). The PD object is also linked to a DG symbol.

Armature (ARMATURES)

An object of this class is linked to the ARMATURES table and from there to one of the sub-tables (e.g. VALVES). The PD object is also linked to a DG symbol.

Pipe run (PIPES)

This class is actually a special kind of ARMATURE, so the same applies as for ARMATURES above. The sub-table for this class is PIPES.

Instrument (INSTRUMENTS)

An object of this class is linked to the INSTRUMENTS table and from there to one of the sub-tables (e.g. T_INST). The PD object is also linked to a DG symbol.

Instrument line (ILINES)

Instrument line is actually a control line. Objects in this class are a special kind of INSTRUMENT, so the same description applies as for INSTRUMENTS above. The sub-table for this class is ILINES.