Well for the pre-made ones your best bet would be to look under

C:\ProgramData\Autodesk\<Revit Version>\Libraries\UK\Pipe\Fittings

And then just pick the pipe material you want to use. If those don't suit your purpose and you just want to make your own then the template I would recommend is the simple Metric Generic then just switch the family category to pipe fittings and you're set :thumbsup:

Yeah, the library likes to pretend it has couplings, but they're not really what I'd call a coupling, it's just a non-straight pipe!

Basically I'm using ductile iron pipe, and that comes in fixed lengths of 5m. If I only need 2.5m, they'd cut the pipe in half and use a flange adaptor (like this one: FlexLock Adaptor - Features and Benefits - Viking Johnson) to connect the pipe to the next piece.

I'll look at creating one them, it's just time consuming - I'm not sure if there is a way to set it up so you can change the diameter of the fitting without actually having to re-draw a new coupling for each pipe diameter (it'd be hundreds of families worth!) - not sure if that makes sense!

You can certainly edit the existing ones to show a different diameter than the pipe diameter it's coupling with. Are you familiar with Family Editor and how to approach this?

-TZ

I'm afraid the existing families aren't suitable - they don't have the right sort of couplings in the standard Revit library.

What I'm trying to work out is: I need a 150mm pipe coupling and an 80mm pipe coupling. I can draw the 150mm coupling, and then manually edit it to suit an 80mm pipe, but is there a way I can automate it? So instead of having to manually shrink the 150mm coupling down to 80mm, I pick the new diameter from a drop down menu and Revit changes it all automatically? If so, what family would be best?

To achieve this you will need to make the families parametric. So instead of having a fixed size, the dimensions are linked to length parameters, which are driven by a controling parameter.

For example; When you place the fitting revit will automatically pick up the Nominal Pipe Diameter from the pipe connectors.
If you know that the outer diameter of the coupling is always 1.5x the pipe nominal diameter, you can use a formula to control this value (Outer Diameter = Nominal Pipe Diameter * 1.5)
Then in the sketch for your round extrusion for the coupling you place a radial dimension and link it to the Outer Diameter parameter.
Then you can just place the family and it will size automatically.

To do this for all possible sizes you will have to get the manufacturers data and see how each dimension relates to the nominal diameter. I find the best way is to graph all the sizes against diameter in excel and fit a formula, but you can also use lookup tables or lots of if() formulas.

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To achieve this you will need to make the families parametric. So instead of having a fixed size, the dimensions are linked to length parameters, which are driven by a controling parameter.

For example; When you place the fitting revit will automatically pick up the Nominal Pipe Diameter from the pipe connectors.
If you know that the outer diameter of the coupling is always 1.5x the pipe nominal diameter, you can use a formula to control this value (Outer Diameter = Nominal Pipe Diameter * 1.5)
Then in the sketch for your round extrusion for the coupling you place a radial dimension and link it to the Outer Diameter parameter.
Then you can just place the family and it will size automatically.

To do this for all possible sizes you will have to get the manufacturers data and see how each dimension relates to the nominal diameter. I find the best way is to graph all the sizes against diameter in excel and fit a formula, but you can also use lookup tables or lots of if() formulas.

Starting with a 'Union' pipe fitting family is probably the best option.

ECO5 - Did you ever find a solution to this? I am looking for couplings as well.