Under the Fitting Parameters group, there are Elbow, Preferred Junction Type, Tee, Tap, Cross, Transition, Union, and Flange settings. Before you can adjust the rest of your system Pipe Type parameters, you need create the fittings that go with your system Pipe Types. To accomplish this, you must go to the Project Browser and choose Families Pipe Fittings. You then select the fittings that will be required for your Pipe Type parameters. You can either load the appropriate family from the Autodesk library or other source, or right-click each of the family fittings and duplicate standard generic Elbow, Cross, Coupling, Tee, and Transition fittings. After duplicating or loading each desired fitting, rename them to the associated material of each pipe that you
previously duplicated to create your Pipe Types (see Figure 11.4).
Importance of pipe type Fittings Selection
When possible, use fitting families that are true dimensions or that closely resemble the dimensions of the pipe fittings you have in your specifications. The physical dimensions are often very different because of the various methods of assembling the pipe. The perfect situation is to use fittings that
have been properly modeled from the manufacturer. As more manufacturers adopt BIM, this information will become more accessible. It should be a regular task of every BIM manager to research what manufacturer’s content is available. Perhaps this can be done annually in conjunction with
each new Revit MEP release. Each time this task is undertaken, review what options are available for pipe fittings that come with Revit along with those available from other sources. You will have to take some time and familiarize yourself with the fittings directory located in the imperial library.
For example, in the Revit MEP 2011 release, Autodesk supplied flange fittings to help provide the end user with the ability to produce a more accurate model.
One noteworthy option that is missing from the Fitting parameters is a pipe spud. To date, Autodesk has not included this pipe fitting family with its content. However, several pipe spud families can be downloaded from the Internet. If you would like to use one in your Steel-Welded Pipe Type, you first have to load the family into your project. Next, duplicate your Pipe Type and
rename it Steel-Welded-Tap. It is criticalthat you have a separate Pipe Type because the fitting Preferred Junction Type parameter is set here. Change it to Tap, set the Tee to None, and the Tap parameter to Pipe Spud (the name of the family you have downloaded or created). Now you will be able to easily choose whether to model pipe with Tee fittings by selecting the Pipe Type SteelWelded, or model with spud style Tap fittings by selecting Steel-Welded-Tap.
Once you have all your pipe fittings, go to the Mechanical parameters to find parameters for Material, Connection Type, and Class. Change these settings to the appropriate types. Also, you may need to modify the Loss method to K Coefficient Table. Finally, verify that the table is set to the appropriate setting (see Figure 11.5).
Once the pipe fittings have been created, go back to the Pipe Type parameters and, under Fitting, select the proper pipe fitting for your pipe type. Doing this will allow you to filter and schedule piping for takeoff purposes (see Figure 11.6). Each category of fitting will allow you to select only families of the same category. The Value shown is family name:type name. Be
sure to select the correct type within each family