Your thread mentions SS material, if so what material, size & schedule pipe are you using? What is the service? do you have an existing option for flanges in the piping material specification? Generally Inspection & maintenance groups shy away from SO Flgs for the hidden internal weld required for installation. submit the missing info to formalize this point.
I mistakenly mentioned S.O. flanges when I intended to refere to lap joint flanges.
The specifications that I have for general flanged connection are:
1) Sch 40S A-312 SS pipe, stub ends, A-105 class 900# lap joint flanges.
2) Sch 10S A-312 SS pipe, stub ends, A-105 class 150# lap joint flanges.
These are for various process services.
I was wondering if it is good practice to install restriction orifices with this lap joint flanges or it is better to use welding neck flanges instead.
