geometry. Typically, larger diameter pipelines are displayed as 2-line to allocate space or check interference
with surrounding objects.
Straight Centerline Display of Elbows
Pipe standards and companies use straight centerlines in 1-line, 2-line, model, and plan displays to accurately
represent the location of the intersection of an elbow. Pipe designs typically determine the centerline path.
Wastewater piping contractors and fabricators use straight centerlines to guarantee accuracy in process piping
installations and fabrication drawings.
The centerline display of elbows in AutoCAD MEP is based on the path and orientation of connectors 1 and
2 on the elbow. The centerline display typically follows the path of the curve. It is generated in all orthographic
and model views.
The following example shows a straight centerline of elbows on a pipe in 2-line display. One of the elbows
in the illustration is 45 degrees and the other is 90 degrees.
Straight centerline on pipe in 2-line display
You can control the centerline display of elbows and store your display results in the drawing. This capability
applies to the Piping domain, as well as Electrical, and HVAC. For more information about configuring the
straight centerline display, see
Configuring the Straight Centerline Display of Elbows
on page 284.
Placeholder Parts
Placeholder parts are 1-line dimensionless parts you can use for preliminary designs. When you draw systems
with placeholder parts, the software inserts segments and fittings at appropriate points like other pipe types.
You can convert placeholder parts to any other part type, such as commercial steel or copper tubing.
To draw a system with placeholder parts, configure a routing preference using placeholder parts in the default
part catalog. The default Aecb Model drawing template includes a placeholder routing preference. Draw
systems just as you would for any other pipe type. To convert the placeholder parts to other parts, modify
Pipe System Displays | 261
Summary of Contents for 235B1-05A761-1301 - AutoCAD MEP 2010
Page 1: ...AutoCAD MEP 2010 User s Guide March 2009 ...
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Page 242: ...Modifying the elevation of a duct 224 Chapter 6 Drawing HVAC Systems ...
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