Seamless Laterals and Reducing Laterals

[buckingbronco83]

I'm new to the forum so please be nice and hopefully I am asking this question in the right place. I'm working on a power project and we are currently doing the underground piping. The specification calls for 45 Eq Lat Custom, Manuf. Std, BE, A234 Gr WPB, SMLS. The laterals received on site have an obvious weld where the fitting laterals. The project team is questioning whether these are considered seamless fittings. Has anyone ran into this?

 

[pennpiper]

buckingbronco83,
Is it possibls for you to post a picture of one of these fittings?

Sometimes its possible to do all the right things and still get bad results

 

[buckingbronco83]

Here is a picture of one that we have already installed. You can see the weld where it reduces and branches.

 

[pennpiper]

buckingbronco83,
Thank you for the picture, it helps a lot.
Now, This lateral fitting is made up of two parts, the 'run' and the 'branch'.
The portion of the fitting that is the 'Run' is (or can be) made of seamless pipe.
The portion of the fitting that is the 'Branch' is (or can be) made from seamless pipe.
This is one of the normal ways of making this type fitting.
These two components are then joinded together with a butt-weld. This weld can be 100% x-rayed as part of the NDE requirements of the applicable ASME B31 Code.
However. this would normally only be required for a pressure system not a gravity flow atmospheric drain.

So the question is, why did you specify 'Seamless' fittings and what kind of system is this? What is the Operating Pressure and Temperature?

Sometimes its possible to do all the right things and still get bad results

 

[XL83NL]

There's a weld so I would call this seamless. Pretty obvious