Graphics Programs Reference
In-Depth Information
• Hydronic Return
• Hydronic Supply
• Other (You can't use any calculations for this option, so this option is
appropriate only for systems that don't require calculations.)
Each of these items is what we call a
system classification
. System
classifications are hard-coded in Revit, and you can't create new ones.
However, you can create additional system types by right-clicking any of
the existing piping systems in the Project Browser and selecting Duplicate.
When duplicating piping systems, it is important to determine what the
system classification should be and to select an existing piping system that
isalreadyassignedtothatsystemclassification. Onceyoucreateyourpiping
systemandrealizethatthesystemclassificationisincorrect,thereisnothing
you can do but delete it and start over with another one that has the correct
system classification. In other words, system classifications have
limitations:Youarenotallowedtochangethesystemclassificationofpiping
systems or create or delete any system classifications. In addition, you must
have at least one piping system for each of the 11 system classifications, and
you cannot delete any of them even if you don't need them for your project.
Selectingthecorrectsystemclassificationcanseemobviousforsomesystem
types—for example, chilled water is always going to be hydronic flow and
return. However, lesser used systems can be more difficult—for example,
medical gases and lab gases could fit into a number of different categories.
It's essential to ensure that the system classification selected is then
communicated to the entire team and used consistently throughout.
Each piping system can be assigned its own project-wide graphic override
from within the system type properties (see
Figure 11.2
). This, combined
with the ability to assign a segment of pipe to any of these piping systems
without attaching it to a fixture or equipment, lets you improve the
documentation produced earlier in the design process, when equipment
families had not yet been built.
