Piping Instance Properties

View and modify the instance properties for piping.

Parameter	Description
Mechanical
Calculated Pressure Drop	Displays the pressure drop for an entire network. This parameter is only available on mechanical equipment that uses the Pump classification and when you have enabled analysis for closed loop hydronic piping networks on the Hydronic Networks tab in the Mechanical Settings dialog. See Classification.
Calculated Flow	Displays the flow for an entire network. This parameter is only available on mechanical equipment that uses the Pump classification and when you have enabled analysis for closed loop hydronic piping networks on the Hydronic Networks tab in the Mechanical Settings dialog. See Classification.
System Classification	Defines the system for the connectors that are located on equipment. For example, piping equipment could have a system classification of Hydronic Supply, Hydronic Return, Sanitary, Vent, Domestic Hot Water, Domestic Cold Water, and so on. These values are pre-defined classifications within Revit.
System Type	Defines the system types for an MEP system. You can duplicate an existing system type to create additional system types as needed for the model. For example, if you need a system type for high pressure supply air, duplicate the Supply Air system type, rename it, and change the properties as needed.
System Name	A name that uniquely identifies a system, it may be user-defined or automatically generated.
System Abbreviation	A user-defined abbreviation for a system.
Loss Method	Defines the loss method for the selected fitting.
Loss Method Settings	Defines the loss method settings used when calculating pressure drop for a pipe fitting.
Pipe Segment	Defines the content used for a pipe section.
Diameter	Defines the nominal diameter for a pipe section.
Connection Type	Defines the type of connection for a pipe fitting or section, such as welded, threaded, grooved, glued, soldered, or flanged.
Roughness	Defines the roughness for a pipe section.
Material	Defines the material for a pipe section.
Schedule/Type	Displays the schedule or type for the selected pipe.
Segment Description	A user-defined description for a pipe segment.
Invert Elevation	Defines the elevation for the bottom of the pipe, with respect to the outside diameter.
Section	Defines a run of segments and fittings that have the same velocity, for example, the same flow, size, and shape.
Area	Defines the surface area of pipes, ducts, conduits, and cable trays.
Critical Path	Indicates whether the selected pipe is on the critical path of the network. Revit calculates the pressure drop of each path and specifies the one with the largest pressure drop as the critical path. You can set up a view filter or system color fill scheme to display the critical path. See About Controlling Visibility and Graphic Display of Elements Using Filters.
Mechanical - Flow
Additional Flow	Defines the additional flow for the selected pipe.
Flow	Displays the flow rate for the pipe or pipe connector.
Reynolds Number	This value is calculated using the following formula:
Relative Roughness	This value is calculated using the following formula:
Flow State	The flow state is determined by the value of the Reynolds Number. A Reynolds Number less than 2,000 is considered laminar flow. A Reynolds Number greater than 4000 is considered turbulent flow. Numbers between 2,000 and 4,000 are unpredictable and no loss calculation is made. There are two types of turbulent flow: transition and complete turbulence.
Friction Factor	Friction factor used in Darcy-Weisbach equation is calculated based on the flow state Laminar Flow Turbulent Flow
Velocity	This value is calculated using the following formula:
Friction	The pressure loss for a specific length unit of pipe.
Pressure Drop	Displays the pressure drop for the selected pipe, fitting, or connector. To see the pressure drop for each path through the fitting, check the pressure loss report.