About Parametric Parts in Part Builder

Parametric parts give you the flexibility to create pipe network parts that are dynamically sized according to size parameters.

You define a parametric part by creating a 3D model of the part and assigning variables, or parameters, to control its shape and size. Parameters are defined by individual values, lists of values, or calculated values based on equations. When the pipe network part is placed in your drawing, you select specific part sizes and the part is dynamically built to reflect the specified shape and size. Parametric parts enable you to create a single 3D model for a part family that can be updated to represent multiple part sizes. You can define millions of parts through a single model, depending on the number and type of parameters defined.

It is beneficial to create pipe network shapes as parametric parts for many reasons. Many of the shapes used to represent pipe network components share the same geometric features; however, the features change in size according to the design. For example, an 8-inch circular PVC pipe looks just like 10-inch PVC pipe except for the pipe diameter. Similarly, you may have two headwall structures that are the same basic shape but have different heights, widths, or both.

• Pipes: An 8-inch circular pipe looks the same as a 10-inch circular pipe, except for the size of the diameter. By creating a parametric part, you can create a 2D cross section of a circular pipe and assign a parameter for the pipe diameter that can change in size. When the pipe is placed in your drawing, the 3D pipe uses this cross-sectional shape parametrically sized to match your part size selection. You specify which size pipe you want and the appropriate diameter is dynamically built to match.
• Structures: A 38-inch concentric gully looks the same as a 48-inch gully, except for the height and diameter. By creating a parametric part, you can create a 3D model of a gully structure and assign parameters for the height and diameter that can change in size. When the gully is placed in your drawing, you can specify the height and diameter, and the appropriate size gully structure is dynamically built to match.