Working with interference checking in Revit

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MARTHA HOLLOWELL ORCUTT: Working with Interference Checking

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in Revit.

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In this video, we're going to use the Interference Checking

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tool to do a quick review of ducts and pipes

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that are running in tight spaces in the project

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so that we can make changes at an early stage in the project.

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The built-in Revit Interface Checking

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complements other solutions, such as the Clash Detective

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in Navisworks, which is more flexible,

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and BIM 360 Coordination, which is more automatic.

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The advantage of Revit Interface Check

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is that it runs directly on the design model, which

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means issues can be found and resolved within the same tool.

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I'm working in the small medical center building.

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And you can see that there are plenty of pipes and ducts

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just showing in this 3D HVAC view.

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I'm opening the 3D Ground Level Coordination view,

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and you can see that lights are visible,

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as are pipes for plumbing.

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This is a 3D View shown in Top View mode,

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but you can also rotate this view.

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I'm also going to open the 3D Second Floor Coordination view.

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Having these views open will help us discover

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the location of interferences.

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In the Collaborate tab on the Coordinate panel,

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I'm going to expand Interference Check and select

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Run Interference Check.

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In the Interference Check dialog box,

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I can select from the current project or the linked

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architectural or structural file instead.

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Then, I'm going to select the categories

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that I want to review.

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It's good practice to first make sure your own services are

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clash free before checking it against another discipline.

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Then, you're going to want to check for important clashes,

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such as drainage pipes and foundations,

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which are among the first things built,

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and they cannot be easily resolved on site,

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unlike a pressure pipe that can be routed over an obstacle.

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And of course, you want to make sure there

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are no clashes with the building structure,

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so contractors won't drill holes through the beams.

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Instead of running an Interference Check

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on the full model, I'm going to cancel out of this dialog box,

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and then try another way.

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To limit the number of interferences,

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I'm going to select elements before running Interference

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Check.

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So in the Second Floor Coordination view,

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I selected some of the elements on the back of the building,

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and then I'm running the Interference Check.

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In the Interference Check dialog box,

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I now need to specify which elements I want to check.

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In this case, I'm going to check the ducts and duct

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fittings against pipes and pipe fittings.

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And let's see what happens when I click OK.

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The Interference Report displays with just a few issues.

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First, I'm going to select the Export button

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and create an HTML file that I could share with other users,

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and then I'm going to close the dialog box.

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I've opened the Interference Report,

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and you can see that the three interferences are listed along

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with the element ID for each.

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So if you pass this file along to other disciplines,

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they can use the element ID number

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to find the elements in the project using the Select

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Elements by ID tool.

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But for right now, I'm going to flip back to the project

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and use other options in this case.

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So I'm going to go to the Interference Check.

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And I can click Show Last Report to return to my Interference

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Report dialog box.

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The Interference Report displays with just a few issues.

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I can expand them to see what the interferences are,

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but I don't really know where they are.

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So I'm going to select one of the elements in the list

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and click the Show button to see where they are interfering.

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So I need to zoom out a little to see

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where I am in the project and what the issue is.

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In this case, it's a pipe running through a duct fitting.

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This needs to be corrected.

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I can do this with the Interference Report dialog

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box still showing.

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I'm going to change the Middle Elevation to 10 foot 10.

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That gets me over the duct fitting.

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Now in the Interference Report dialog box, I click Refresh,

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and you can see that that report updates.

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Let's try another one.

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In the next two cases, when I click Show,

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you can see that we have a duct, and then there

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are pipes overlapping them.

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When I select the other one, it's

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the same duct but a different pipe.

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I recognize that these pipes are part

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of a group of parallel pipes, and I need

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to be careful how I fix these.

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So here are the group of parallel pipes.

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Each of these are part of the system,

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and then these two right here are the ones

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that I need to make a modification to.

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But to do that, I'm going to start at this end

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and raise that.

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This is the highest at the moment.

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Let me get that out of the way.

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And so now, I'm going to change the height of this

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from 10 foot 6 to 10 foot 8.

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That's going to raise up--

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I'm going to raise up my entire set of pipes two inches.

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So I'm going to change this one now from 4 and 1/2 inches--

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and I'm going to continue down the line.

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So this one's now

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This one we're going to make

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And finally, I'm going to raise this one, even though it

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didn't need it, but to keep it together, 10 foot 2 inches.

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And now, when I come back in here and click Refresh,

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you can see that cleaned up the interferences.

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Now with all the interference corrected,

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I can close the dialog box.

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Fixing all these interferences now

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while you're still in design development

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will save a lot of time when it comes

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to constructing the building.