Tying Fixtures into Waste Runs in Revit MEP: BIM 321 Course Tutorial

Connecting Fixtures and Tying Waste Pipes in Revit MEP: BIM 321 Course Tutorial Part 2

In this article, the process of connecting fixtures to the main run in Revit MEP is discussed. The article focuses on the practical aspects of working with the software, including how to adjust and align pipe systems to ensure a smooth connection between different parts of the system.

Key Insights

  • The article provides a detailed step-by-step guide on how to connect fixtures to the main run in Revit MEP, a software used for building design and modeling. It includes the process of adjusting the main run, aligning pipes, and checking the pipe type and slope.
  • One of the key challenges in Revit MEP is ensuring the pipes are appropriately aligned in plan view. The article offers practical tips such as using the align function and drawing detail lines to ensure proper alignment.
  • The article emphasizes the importance of checking and adjusting pipe types and slopes to ensure a smooth connection. It also provides tips on how to deal with issues that may arise during the process, such as short connections and the need to make design decisions on the fly.

Welcome back to the CAD Teacher VDCI video course content for the BIM 321 course, Introduction to Revit MEP. In the previous videos, we went ahead and actually got our mains run, and now we want to go ahead and start tying our fixtures into the waste run. The one thing I want to go ahead and do real quickly though is I'm going to go ahead and expand my section out just a little bit, and I want to go ahead and actually let's bring this pipe a little closer to the wall.

So I'm just going to go ahead and tap it over, and there we go. So I want to go ahead and I want to look at my fixtures looking parallel with them. So I'm going to go ahead and rotate my section.

So I'm going to select my section, go RO for rotate, I'm going to pick drag, and I'm going to go 90 degrees. I'm going to go ahead, and what happened here was I accidentally selected the link, and this can happen. So I'm going to go ahead and hit control Z, and what I want to go ahead and do actually also is I'm going to go ahead and select the link, and then I'm going to go up here and I want to pin it.

So this is one of these things that can happen from time to time, but we're going to go ahead and pin it in place so that that doesn't actually happen to us. There we go. So I'm going to zoom back in, and I want to go ahead and pull my section back so I can see my fixtures.

I'm going to go ahead and start here. Now one thing when we're connecting all this, we have to remember that these fixtures, they need to be ahead and actually connected to the specific pipe, but we also have to leave room for the fittings. So I'm going to go ahead and start with my right toilet here, and I'm going to go ahead and click on that out pipe, and there we are.

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Now the one thing we need to go ahead and look at before we start doing anything is going to be our pipe type. For some reason it wants us to go back to domestic water supply, so let's go ahead and change that to our waste piping. I want to go ahead and check my slope.

I can see that it's an eighth of an inch, and it's sloped down, which is what I want. I'm going from the fixture to the pipe, to the main. So I'm going to come down, and I'm going to slope over, and there we are.

I'm going to come down again, and there we go. I'm going to go ahead. Let's take this guy up just a little bit, and let's see here.

Can I connect this in? I'm going to drag down and pick, and it allows me to connect it in, but as you notice, I have that giant fitting there. So I'm going to go ahead and select that fitting, and make it the T reducing sanitary. And as you can see, we have a lot more pipe space here now because we used that fitting.

I'm going to go ahead and maybe take that up to about there. I want to go ahead and tie this guy into this pipe here, so I'm going to go ahead, click here. Again, check this.

I want to check, make sure this is waste piping. I'm going to go ahead and drag down. I'm still sloping down here, which is perfect.

I'm going to go ahead and take it over, and there we go. I'm going to go ahead and bring this down to about the middle of the pipe. I want to go ahead.

Now, if I drag this and take it over, look at what happens to my slope. I now no longer have a slope. So I want to go ahead, do a right click, and draw a pipe, have my slope still go horizontal, and I'm still sloping, and pick, and there we go.

I'm going to go ahead and bring that down just a little bit. We've tied those two toilets in. I'm going to grab my section, go down to the next one.

Same exact kind of thing. I'm going to pick here, click on the out. Again, check here.

I'm going to make sure this is my waste piping. I'm going to come down, go over, go down, and it's not allowing me to have enough room. So I'm going to go ahead, hit cancel.

I'm going to hit escape, and I'm going to bring this guy up. Let's see here. I'm going to try and bring it back down again.

Draw a pipe, and there it goes. Again, we have a very large fitting here, so I'm going to go ahead and select that, and change it to my T-standard reducing. Now, let's say that I'm working through a project, and I feel like I'm doing a lot of work and having to change that every single time, and we're going to continue to use that T-standard reducing.

We can go ahead and change our routing preferences. Under my systems tab, I'm going to go to pipe. I'm going to go ahead and save.

I'm going to go to pipe. I'm going to go to my waste piping, and I'm going to go ahead and go edit type. I want to go to my routing preferences, and hit edit.

Under my T, I want to use T-reducing sanitary rather than normal T, because if I do the normal T and then the different sized pipes, then it has to actually put the coupler in. So, I'm going to go ahead, hit okay, apply and okay, and there we go. So, now whenever we connect another pipe to this, it's going to automatically give us that specific piece.

I'm going to go here, click this down. I'm going to check my pipe type. I'm going to check it back to waste piping.

Come here. I'm going to still slope down. Let's see if we can tie that in.

Again, I didn't have quite enough room for the fittings, so I'm going to go ahead, right click, draw pipe. Still on my waste piping, still on my slope down. Drag.

I'm going to go ahead, let's go ahead and kind of center this. Maybe bring this guy up just a little bit. Obviously, I don't want the fitting in the actual concrete.

Draw pipe. Let's go ahead, take that over. And it's going to kind of take a little bit of massaging to get this to want to tie in.

And you have to remember that this pipe is also sloping up. What's happening here is that the line is too short for it to actually be drawn. There's a small connection here, but it's too short.

So I'm just going to hit cancel and just tap this up just a little bit more. Draw pipe. There we go.

And that should tap in there perfectly. Awesome. Maybe change it just a little bit.

But as we get farther and farther up here, we're going to start running into this issue more and more. We need to go ahead and bring this pipe, our main, down. So I'm going to go ahead and do a rotate.

And do a 90 degrees. And what I'm going to go ahead and do is I'm going to go ahead and let's go ahead and bring that down. It's at negative 3 feet right now.

Let's just keep bringing that down. And since it's all connected, it will go ahead and actually keep that system connected and extend the pipe. I'm going to bring this out.

I want to see what this ends at. So as I can see, this one's at negative 3 foot 7. So I'm going to go ahead. I'm not too worried about this 205, 256 of an inch.

That's okay. So there we are. Let's go ahead and rotate our section back.

R-O for rotate. 90 degrees. Going to come here.

I'm going to go ahead and bring this 2 inch out. And we're going to go ahead and let's route it through here. I'm going to come through the wall.

And then come down. There we are. I'm going to go ahead and before I bring that out, I'm going to go ahead and bring this guy down.

And if you notice, I forgot to check my pipe type here. So what I need to go ahead and do now is I'm just going to go ahead, tab, select all those pipes and delete. I'm going to go ahead and select here.

Check that. Again, remember to check this here. Waste piping.

Come down. I'm going to come over. I'm still sloping down.

Go down again. There we are. Let's go ahead and bring this guy down.

I'm going to go ahead and change my pipe type to waste piping. I'm going to go ahead and tie these two together. There we are.

Now obviously, this connection would not work like this. I need to go ahead and increase this pipe size here. So I'm going to change this to a four-inch pipe.

And there we are. I'm going to go ahead and just grab this grip, drag it down, and it should tie in just fine. Now you can see that it's automatically using those smaller fittings for us.

I'm going to go ahead and bring this and bring it up just a little bit. There we are. Let's go ahead and let's go to the sinks.

Now the sinks are going to need what was called a P-trap. Typically, urinals and typically toilets have their P-traps built in. We're going to have to put a fitting in here and then tap it out.

We'll see how this goes. I'm going to go ahead and bring this down. Again, change this to waste piping.

I'm going to go ahead and bring this down to about there. Do the same thing here. Here, waste piping, and bring it down.

Now I want to go ahead and add on the P-traps. So to go ahead and bring in those P-traps, we first have to load them into the file. So I'm going to go here to my pipe fitting under my systems tab.

I want to go ahead. Let's go load family. I'm going to scroll down, find pipe, go to fittings, go to my PVC, schedule 40, socket type.

I need to go DWV, and we want to go ahead and find trap P right there. Trap P, and I'm going to hit open. It's going to load it in, and there we go.

Now we don't have to set a size for this, but as you can see, if I zoom in here, I can go ahead and place it wherever I need to. So I'm going to go ahead and pop it in about right here. There's that one.

If I need to rotate it, I can hit space bar, but I'm also going to go ahead and just pick. And then I'm going to select the P-trap, and I can do this. And this is going to rotate it to the correct positioning for me.

I'm going to go ahead and suck these up. I'm just using my directional arrows. And what I'm going to go ahead and do is I'm actually going to take this and draw a pipe going out.

There we go. I'm still sloping, which is what I want. I'm going to come down.

I'm going to go ahead, and now I could draw a pipe out of here, sloping down still. Still on my waist piping, which is what I want. And I can go ahead and bring those up until they're about the same.

Now, I could technically tie these in together here. The only issue is that this wants to keep it at the same slope, so that doesn't really work. So I'm going to go ahead and choose which side I want to be slightly lower.

I'm going to go ahead and bring this one up just a little bit more, because we still want to give room for cabinetry and everything, even though we're not putting it in. I'm going to take that there. And then I can go ahead, right-click, draw pipe, and I'm going to connect this into here.

And there it is. Beautiful. I want to go ahead and align this pipe to the center here.

So I'm going to go AL for align, pick the center line of the pipe here, and go over. And then I could just grab that grip, bring it straight down, and make sure that we get the snap there. You might have to play with it for a second, or maybe even zoom in.

It doesn't seem like it's really wanting to. There we go. I just hit TAB, and it selected through that, and we've connected those sinks in.

Let's go ahead. Let's go to the next sinks, please. Grab my section, slide it over.

I'm going to create my short little stub out here. Again, I need to make sure I'm checking this up here. This is one of these things about Revit MEP that you've got to get used to.

There. I'm going to change it to waste piping. Come down here, bring this down.

Again, change it to waste piping. There. I want to go ahead and choose my pipe fittings.

Make sure I have my P-trap. I'm going to hover over the pipe I want to connect it to and pick. Hover over the pipe I want to connect it to and pick.

And then I'm going to go ahead and use my little rotation guy here to rotate it. There we are. I'm going to hit escape.

Draw my pipe out. Again, still sloping down. And I'm still on waste piping.

Draw pipe. I'm going to go ahead and draw this pipe straight down. Let's go ahead and suck this up just a little bit.

I want to align. AL for align. I'm going to pick the center line there and align that there.

I'm going to go ahead and bring this guy down just a little bit more. I'm not sure that that fitting is going to fit there. I can't drag it out like that.

I have to right-click draw pipe. If I try and grab the grip and drag it out, I'm going to mess up my slope. Come here, pick, and there it is.

I can go ahead and raise that even a little bit more too. Perfect. We've got all of our sinks and all of our toilets in.

The last thing we need to go ahead and do is bring in our fountains. I'm going to go ahead and select it from my plan view. Let's take a look at this action.

I'm going to do a rotate on my section, 90 degrees. Let's see how this has to come out. If I select here, I can see I have that guy there.

I've got to come out a little bit. And I'm going to come down. Again, I didn't check this again.

This is one of these things that you'll get used to over time. I'm going to select that, click on this, change my pipe to waste piping. I'm going to come into the space there, come down, and there we are.

Now I need to go ahead and look at my other ones. I'm going to actually do my rotate this back again. From my plan view, I'm going to go ahead and create my out.

There we go. And I notice that I need to align it with the center line of my pipe, my waste pipe. So I'm going to go ahead and kind of put a 45-degree bend in it like that.

Again, one of these things, I just did not check that again. I can tell by the types of fittings. So select here, 2-inch out.

I'm going to go ahead, change it to waste piping. I'm going to come out through the wall and go ahead and 45 over just a little bit, maybe make that a little bit longer. I'm still sloping down, which is exactly what I want.

I'm going to go ahead and drag my section back. And the one thing I notice here is in plan view, this just does not work right. Obviously, I could not go into a wall connection like that.

So I'm going to go ahead and actually delete out the pipe and the fitting. I'm going to go ahead and actually run this through the wall. So right-click and draw pipe.

I'm still sloping down. And I'm actually going to go ahead and bring that through the wall like that. It's going to tap off like here.

I'm going to go ahead and go into my section view. And let's make it so I can't see this other pipe. And I'm going to go ahead, draw pipe, and I'm going to go ahead and bring it down.

And there we are. I want to go ahead, select this back so I can see my other pipe here. Now, this is one of the things.

When we have a lot of pipes working in one location, what you can do is I can select here, come over to here, and it's going to give me the grips. So I don't know exactly which pipe I need, but I know in my plan view I want to select this pipe. So I'm going to select it here, come over to my section view, and the grips are going to show up here.

So I'm going to do a right click, draw pipe, and go straight down. There we are. I want to go ahead and align the center of that pipe with the pipe here.

So I'm going to align there to there. And we're going to have to see what we can do with this because it's acting a little bit funny because of the fact I don't have enough room here for the fittings. So I'm going to go ahead and hit cancel.

And let's go ahead and actually, let's see here. Let's go and I'm going to do a control Z and undo one step back. And so now we're actually going to go ahead and actually approach this from a different manner.

We're going to run both these pipes down, tie them together, and then tap in to the end here, which will work perfectly fine. We've got to go ahead and change our section a little bit. Again, this is one of these things that happens with Revit MEP.

As you're working, sometimes you figure out things that don't work out. So you have to make changes on the fly and make those kind of design decisions. I'm going to come here, and I'm actually going to get rid of this fitting and this angle.

I'm going to go ahead, take that pipe, and I'm going to bring it straight down. Come there. One thing I also noticed is we didn't connect this pipe into here quite yet.

That's perfectly fine. We'll get it fixed. I can go ahead, let's see if I can bring this back just a little bit so it's actually in the wall.

There we go. It's going to be a tiny piece of pipe. And you know what we can do is we can just go actually, I'm going to bring this out through the wall as such.

And actually what I'm going to go ahead and do is tie this drain into this one. So I'm going to do my rotate 90. You can see that there.

I'm going to go ahead and bring that there. And let's see if this is going to want to do it. It might not because the slopes don't necessarily match up.

Nope. Okay. That's okay.

When we run this guy down, we'll just tie it in there together. So I'm going to go ahead, drop pipe, bring that back down. And again, I'm kind of thinking on the fly here.

So I'm actually going to go ahead and escape and back up one step. I'm going to take this guy and bring it through this wall here. Just like that.

And then I'm going to go ahead and make an angle over. Actually, we're going to go ahead and go down on the inside of the wall there. So I'm going to do a rotate 90.

There we are. Again, I'm kind of seeing a little bit too much. So I'm going to go ahead and reduce my section just a smidge.

Perfect. I'm going to right click, drop pipe, go straight down. And we'll tie these wastes in together.

Okay. It's not wanting to find it. So let's go here real quick.

And I'm going to go ahead and kind of adjust it just slightly. Seems like this fitting. There we go.

Okay. I'm going to go ahead, drop pipe. And it's still not wanting to give me exactly what I want.

So I'm just going to extend the length of this pipe. Drop pipe. And there we are.

Now I can, let's see how far I can slide it back. About there. I mean, we can almost butt these fixtures up to one another.

I'm going to go ahead and now rotate 90 degrees here. So I can see exactly what I'm looking at. So I've got these two pipes coming down.

None of which are on center. So what I'm going to go ahead and do actually is, is I'm going to tie these two together first. Like that.

So just right click, drop pipe to here. Okay. And what's happening is, is they're not aligned in plan view.

So I'm going to go ahead and actually align with the center line. The center line. And it's not really wanting to give me it.

It can't align very well. So what I'm going to do is, I'm going to draw a detail line. I'm going to go DL.

And this is one of the tricks that I use quite often. And I'm going to start at the center point of that line, come down. Now I'm going to go AL for align.

Pick here. And then pick there. And now they are aligned in plan.

Now I can go ahead, right click, drop pipe. And those are going to connect now perfectly fine. One thing that we need to go ahead and do is, we need to come out here, but we need to adjust this so we can tap straight into this.

So I'm going to go ahead and do an SL for split. And split this guy here and this guy here. I'm going to go ahead now.

And I'm just going to go ahead and put a 45 degree bend in this. Just like we did with everything else. With regards to like the duct.

I'm going to go AL for align. Pick the center line here. And align that piece.

I'm going to grab this and drag it over to a 45 degree. TR for trim. There.

And there. I can go ahead and actually move that up if I wanted to. Everything else is good.

So let's say I want that connection higher up. Perfect. That works beautifully.

And that ties in our entire first floor. Whew! That was quite a little bit of work. And a little bit of stuff we've got to do.

And one thing we just need left to do is. Is tie in this guy right here. Okay.

And what I'm going to go ahead and do is. I'm just going to align it real quick. Just to make sure.

Select it. Drag down. I might need to.

If you need to hit TAB to connect it in. That will always happen. That can happen too.

I'm going to come down here. Select it here. Drag down.

Tab. There it is. And let's see what's happening here.

So it's giving me an error. Okay. So I'm going to hit cancel.

And what might be happening is that this pipe isn't long enough. So I'm just going to extend it just a little bit. I'm going to go ahead and make sure it's aligned.

  1. Pick the center line. Pick here.

Again, pick the center line. Pick here with my line. Drag this down.

And there we are. Okay. The last thing I want to go ahead and do.

Is that this is the end of the line here. So in the field they put a cap on it. So I'm going to select it.

Do a right click. And cap open end. So that is all capped off and good to go.

I might be able to put a clean out there. Something along those lines for later on. We got our entire first floor dialed.

Took a little bit of time. But it all worked out. I'm going to go ahead and pause this video here.

And we're going to start to do the second floor. See you then.

photo of Tyler Grant

Tyler Grant

Revit MEP Instructor


Tyler Grant is a BIM Manager a Delawie. A dedicated, goal-oriented, and experienced architect. Tyler has managed multiple design/build BIM projects from inception to construction completion, through all phases. Technology-driven and experienced educator to train and instruct users, both novice and advanced, in the workflow and processes of the modern architecture, engineering, and construction field. 

More articles by Tyler Grant

How to Learn Revit MEP

Specialize in MEP (Mechanical, Electrical, and Plumbing) systems within Revit for advanced design solutions.

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