Friday, December 30, 2011

Revit MEP: Duct System Graphic Overrides

When you start drawing duct or pipe in Revit MEP with the Out Of The Box (OOTB) project template, you may see some color overrides automatically applied.  Where do these come from?  And more importantly, how can we customize them to our own standards?  Let’s start with the “Duct” tool.  Before we even place our first point, let’s look at the “Properties” palette and notice the parameter there, under the “Mechanical” heading, called “System Type”. 

This parameter allows us to designate the type of system our duct is without needing to connect to equipment or air devices (as was required in the past).  You will notice that for the OOTB project template, duct system overrides have been set up for each of the available system types (Supply, Return, Exhaust).  Please note, you can add additional system types as needed.  These defaults are meant only to demonstrate possibilities.

These overrides are stored as “Type Properties” of the “System Type”.  The only way to access these properties is by placing an element in that system (you have to model something first).  After placing the duct in the model, select it.  You should see a new tab appear in the ribbon called “Duct Systems”. 

Switch to that tab and notice the “Properties Palette” updates to show the properties of the duct system rather than the duct itself.  Click on the “Edit Type” button to access the “Type Properties” of the duct system.  From here you will see the top line is where these “Graphic Overrides” are controlled.  Pick that “Edit” button to change the line “Weight”, “Color”, and “Pattern” as you like.

From the “Type Properties” of the system you can also “Duplicate” the system type to create various types each with unique graphic overrides as needed.  You can also assign the “Rise/ Drop” symbol to be used with the system.

It should be noted that procedures for pipe systems are analogous to the duct procedures shown here.

Tuesday, December 20, 2011

Revit MEP 2012 Pipe Rise/ Drop Annotation Size

You may have noticed your pipe rise/ drop annotations showing up larger than you would like.  
The way that Revit controls these underwent a minor tweak with the 2012 release.  Let’s look first at the “Mechanical Settings” dialog box. 

Here we will find the “Pipe Rise/ Drop Annotation Size” setting.

The problem you may run into here is that the rounding doesn't seem to allow you to go less than 1/8”.  This rounding, however, is controlled in an entirely different dialog box: “Project Units”.  

You can access the "Project Units" dialog from the manage tab.

In the “Piping” discipline, under “Pipe Size”, the rounding you find here will control the “Pipe Rise/ Drop Annotation Size” which we found earlier under “Mechanical Settings”.  Set this rounding to a finer value (1/32" or 1/64") and then back in the mechanical settings dialog box try adjusting your “Pipe Rise/ Drop Annotation Size” to 3/32” and see how that looks.