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Lap joint flange facing

KunAbdel

Mechanical
Mar 8, 2025
6
In weld neck flanges we specify the facing of the flange for example raised face (RF) and based on that we use a specific gasket to match the facing of the flange

What about lap joint? In autocad plant 3d I can only find Flat face (FF) in the catalogue is it true?
 
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The hub of the flange is normally the same size as the RF bit of an RF flange.

I've never seen a RTJ lap joint.
 
The hub of the flange is normally the same size as the RF bit of an RF flange.

I've never seen a RTJ lap joint.
i just saw a picture on the internet of a stub end with RTJ facing
Also i saw something in ASME B16.5 idk if it is related or not --> para 6.4.3.4

need someone to confirm
 

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  • wp304l-stub-end-bw-dn40-sch80-0.jpg
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Someone might make one but that flange is not an RTJ. I was just saying I had never seen one, not that it wasn't possible to get one.

It's defiantly got a square edge groove so looks like either a large O ring or half of a tongue and groove.

I know the website says RTJ, but it isn't.
 
I implemented RTJ lap flanges. Custom made from two WN flanges to allow rotation in the site assembly.
 

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