Hai Jay,
Here are some standards, but not limited to be studied in detail to find solution for your case
API SPEC 5L Line Pipe
ASME B31.3 Process Piping
ASME SEC IIC Welding Rods, Electrodes and Filler Metals
ASME SEC V Nondestructive Examination
ASME SEC IX Welding and Brazing Qualifications...