Entering The Calculation Formula - Siemens COMOS Operating Manual

Preparing for creation and maintenance of pipe specs
3.5 Administering pipe part catalogs
● Local dimensions saved in the nominal-diameter-dependent characteristics table of the
pipe spec
● A default value is defined for each calculation formula. It serves as the starting value in the
engineering data.
Parameterized access
The calculation formulae with "Cat" in their name read the dimension from a table. Their access
to the table is parameterized via the nominal diameter: The value entered from the table in the
geometry attribute depends upon the nominal diameter of the pipe part in the engineering data.
You can only define a parameter other than the nominal diameter in the case of "Cat2(...)".
Fixed calculation formula for flange ends with contact face
A hardcoded calculation formula is used for flange-ends with contact faces. It takes the
dimensions from the standard geometry tables.
See also
"General geometry description" control group (Page 52)
Using the "Define catalog access" window (Page 31)
3.5.2.2

Entering the calculation formula

The calculation formula consists of a function name and multiple items.
In addition, you can adapt the mathematical function to the result of the function.
Example: = Cat("Y00A00035", "Y00T00011.Y00A00003AA01" ) / 2
Attributes with calculation formula
At the pipe part catalog base objects, the calculation formulae are used for attributes, the
values of which depend on one or several nominal diameters.
Example: "Outer diameter".
These attributes must fulfill the following conditions:
● They are placed on the "3D geometry" tab or one of the "Connector <1-n>" tabs.
● The "3D" value is selected on the "Link" tab in the "Mode" list in the properties of the attribute.
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PipeSpec Designer
Operating Manual, 09/2014, A5E32076948-AA