Thanks for the response. Actually, my orifice consists of 8 side by side orifices. By cutting out the pipe, machining, and re-welding, (option 2) I'm essentially doing what you suggested. I guess I'm looking for a way/tool to avoid having to re-weld my pressure boundary like that.
I have a 2ft long 1" SCH 80 pipe (stainless steel) that is flanged on one end and capped on the other. Near the capped end, I have an 0.051" diameter orifice that is drilled radially through the pipe wall. The flow goes from the inside of the pipe, through the vessel, and into a tank. I need to...