I would need our help.
I have a cryogenic pipe (LIQUEFIED NATURAL GAS) with NPS 20" Th= 32.54 mm. Material A-312 TP-304, internal pressure 130 bar. It is necessary to make a HOT-TAP ( hole on the main pipe in operation) material A240 Gr 304, Th=?. I have to calculate the thickness necessary but I need to know wich is the quality factor Ej since this hot-tap it is a small tube short welded to the main pipe and it is under pressure (130bar) and it will be made a longitudinal welding with a longitudinal backing.
I can't find neither ASME B31.3 nor ASME BP&V CODE, SECTION VIII DIVISION I this Ej= Quality factor for longitudinal weld joint
It isn't possible make 100% radiografied to the longitudinal welds (two longitudinal welds)
What Code should I use and where can I find the quality factor?.
What value can I take?

Thanks