[SHAY O’CONNOR]

Yaroslav,

Looking at the piping arrangement here there’s absolutely no issue with butt welding fittings together of any sort on typical SS or CS specs and the like.
To reiterate 11echo in other words:
In fact all good piping designers should strive for this type of configuration because of cost as well as design.
You are saving in shop labour here reducing welds on time spent welding and material costs with the extra pipe piece between.
As a designer coming from a piping fabrication and installation company back ground this is how we were always taught to design taking into account the fab shop and associated extra costs. Too many designers are not aware of this and will add in extra fittings and welds when they are not necessary.
I understand there will be cases where there needs to be pipe between fittings in high purity situations to allow the weld head in to produce the weld.
Personally if I took a design with poc pieces of pipe between fittings I would alter and produce the iso’s butted together for reasons giving.
This is what I instruct my team to do also where applicable as good piping practise.

[SHAY O’CONNOR]

Hi,
This is down to how the
component is set up in your library parts. It all comes from here if set up correct with the piping rules set up etc.
See attached iso generated in Cadworx of what you are after. Unfortunately you will just need to draw an arrow with the description manually until you get your library component set up correct. The same applies with the orifice flange.

Attachments:

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[SHAY O’CONNOR]

It looks like you have a cast iron 125# flange with it being a fire line tie-in possibly. is it an existing tie-in.

It’s not recommended to mate a RF steel flange to a FF cast iron flange because it can cause it to crack etc when you torque the bolts.

Solution here if you are in a hurry or at a pinch point is to machine down the RF flange and remember to use a full face gasket.

or as Anton says get one added (FF) to the piping spec and order it from your MTO.

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