Siemens COMOS Operating Manual page 20

Life cycle engineering and plant asset management

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Preparing for creation and maintenance of pipe specs

3.4 Managing the "standard geometry tables" standard catalog

Managing the standard catalog

The "standard geometry tables" standard catalog is managed in the base project on the "Base

objects" tab.

"@30 > M23 > A10 > Y30 > A10 Standard geometry tables"

Implementation of geometry standards in COMOS

Geometry standards are implemented in COMOS in the form of base objects that contain the

"standard geometry tables". The actual dimensions are listed in the "standard geometry tables"

in relation to the nominal diameter. See also chapter Structure of the standard catalog for

geometry standards (Page 21).

If a pipe part uses a geometry standard, the attributes in which the dimensions are saved

reference this type of standard geometry table. In the engineering data, the dimensions of the

pipe part are then read from the standard geometry table and written to the attributes.

Parameterized access

The "standard geometry tables" standard catalog is parameterized according to system of

standards, connection type, nominal pressure, and flange shape. See also chapter Structure

parameters (Page 21).

You do not usually link the pipe part directly to a standard geometry table. Instead, you

generate a calculation formula which returns the path to a basic table. The corresponding

dimension is then read from the standard geometry table.

The calculation formula comprises fixed and variable components. The variable components

evaluate the structure parameters. The values of these parameters at the pipe part determine

the basic table from which COMOS reads the dimensions for a pipe part.

See also chapter Using the "CatStd(...)" function (Page 32).

User-defined access versus internal calculation formulae

Internal calculation formulae are provided as standard with the flange joint.

COMOS uses internal calculation formulae in the following cases:

● 3D attributes required for calculation of the component dimensions are not set.

● The attributes are not set up at the "3D geometry" tab.

See also chapter Determining the component geometry of a pipe part (Page 28).

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