Intergraph Smart® Reference Data Piping Classes - Intergraph Smart Reference Data - Help - Hexagon

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In an enterprise or project piping environment, thousands of piping components are available. Countless variations of pipes, fittings, bolts, gaskets valves and other components exist. A piping class defines a subset of components to be used for specific media, pressure and temperature conditions. Since only a correct pipe class can guarantee accurate operation of the plant, the pipe class is a very important document and the downstream processes must follow the rules created in the pipe class.

In the design process of a plant, a process diagram is first created. In a process diagram, the material flows and material properties (physical conditions, pressure, temperature, and other data) are shown. The process diagram has no relation to the components that will be used for construction and, normally, does not contain any pipe class data.

Based on the process diagram, the P&ID is created, adding more detail describing the process. The media flows and their conditions are described in more detail. The P&ID specifies the temperature/pressure relation and the diameters as well as the selection of pipe classes for all lines. Based on the pipe class definition components, such as valves and reducers, are pre-selected and an initial material estimation is produced. In the downstream process of piping design, the pipe class and the P&ID are used as basic documents for further engineering.

A pipe class generally contains the following information:

  • Pipe class header information

    • Pipe class code and description

    • Allowed media for the pipe class

    • Allowed Pressure/temperature ranges

    • General materialAllowed diameter (Diameter table)

    • Allowed schedules per diameter (Schedule Table)

    • Corrosion allowance

    • Allowed branches (Branch table)

    • Allowed gasket type and form

    • Special notes

    • Release index and revision index

  • Pipe class item information

Definition of components including commodity code and size range for allowed component types

  • Pipe class ident information

    • The pipe class information ultimately defines a unique ident for each size and specification item. Such an ident defined in a Smart Reference Data pipe class is called "Spec item ident",

The definition of a pipe class in Smart Reference Data is created based on the following process workflow diagram.

Picture 1

Pipe classes include components and general information created in Smart Reference Data and may be created either in the product group (corporate standards) or at the project level. Pipe classes may be copied from the product group or other projects and can be modified for project use. Once created in the current project, they are independent of another project or product group.

Pipe classes in Smart Reference Data are called specifications since this functionality can also be used for other disciplines than piping.