Sloped piping frustrations

[jseck]

Ok, I'm trying to apply slope to a fairly simple sanitary waste pipe run and am getting the following error:

"The slope that you specified could not be applied to this pipe. Please check the items that it is connected to and make sure that they aren't constraining the slope of them."

That warning applies to 5 pipes, which I have circled in the attached image. It seems to have something to do with the tee fitting based on which pipes failed. I checked the fitting and all three connectors are set to "Allow for slope adjustments". The slope control point is indicated with the "X". I tab select the entire pipe run, click the Slope tool, set the slope value, toggle through the Slope Control Point, and then click Finish. Does anybody have any ideas? It worked fine on a less complex pipe run with only one tee. Are there limits to when this will work?Capture99.JPG

[moliva]

never had much luck at all using sloped pipe in Revit. You might try changing the slope control point to be at one of the end runs rather than kind of in the middle. Not sure if that would help.

Do you always use the sloped pipe?

[jseck]

Well, the slope control point is the lowest point, so it has to be where I have the X. I think it only works for runs without branches. I don't typically do much pluming modeling, but have been tasked to do a lot on a project. It seems easiest to model the longest runs first by specifying slope for each pipe and then go back and model the branches and tie into fixtures. Ideally the "automatic" slope tool would show you slope controls for each pipe segment and allow you to adjust slope direction as needed. I think it just gets confused when it gets to a tee and doesn't know which direction to slope.

[Misteracad]

If I'm reading this correctly, it sounds like you are applying the required slope AFTER you've laid out the pipe. Is that correct? If so, I wasn't even aware that was an option that worked. What happens if you set the slope BEFORE you lay out the pipe? That's typically the workflow I recommend.

[jseck]

Revit allows you to place a pipe (or pipes) with no slope and then apply slop to them. The idea (I think) is that you quickly lay out the pipes and then apply the slope to multiple pipes. It works fine on a simple run with no branches, but how often does that occur in the real world? Therefore, I've been setting the slope and direction as I'm modeling each pipe as you stated.

[USMCBody]

Sorry, I'm not an expert on this one by any stretch, but generally when Revit tells me I can't do something that I need, I just try drafting it a different way. Because in general, there is some implied relationship (that I either care about or don't) that is getting in the way.

Try deleting the pipe your creating and draw it separately then attach it to the system, Try exaggerating the run and then move it back, Try deleting the pipe and right clicking on an end of another pipe and click create pipe to start to draw it again, <insert any and all other random ways you can think of>, ....

Basically just play with it until you get it to work. It doesn't sound like a good thing and it may not be, but if you're stuck sometimes the only thing you can do is play with it. Bang your head against the wall until you break through... Once you got it working just ask yourself, what did I screw up... hopefully nothing, but maybe you did.

Hope that helps some...

[micah.moss]

Sorry for the off topic question on your post, but i am new to plumbing in revit. What is the trick to get the nice patterned double line pipe like you have shown in your picture?

[Kingsley]

Hiya

Don't know if anyone answered your question but I have had this happen a few times. Try bring the pipe down so there is plenty of room between the last plumbing fixture and the pipe on the run.

[mshockey341083]

I've only done 1 job in Revit, but I did quite a bit of sloped piping. If it were me, I would start at the end of the longest run of sloped pipe (basically from where the sanitary piping exits the bldg to the farthest fixture) and draw that stretch first, with the slope ON. Then, branch out from that main line, connecting to fixtures from there. I have had NO luck getting fittings to work or getting pipes to maintain their slope otherwise. Sloped piping increased my modeling time significantly. I may get away from it for the most part. Never got the process of adding slope to Not-sloped piping to work, at all.

[jseck]

If it were me, I would start at the end of the longest run of sloped pipe (basically from where the sanitary piping exits the bldg to the farthest fixture) and draw that stretch first, with the slope ON. Then, branch out from that main line, connecting to fixtures from there.

That is what I do also (model the longest run first and then branch out). That works fine if your design never changes once you've modeled everything, but that never happens. I understand the complexities of having Revit automate sloped piping, but as it works today, it's a brutal process. Modeling everything with no slope and then going back and defining the slope for each pipe would be ideal, but it's not there yet.