[MW:14497] Weld joint strengthcalculation for Branch welded CS Pipe

Dear Experts,

I want to branch a 2" dia CS pipe from 10" dia API 5L-Gr.B sch.40 welded pipe, service is Cooling Water, Design Pr. 8 Bar.g @ DT. 65 Deg.c

The branch is taken from horizontally, how to determine the minimum thickness of weld and strength for this Branch line when I can place a valve (concentated Load) between branch weld joint and nearest pipe support. Is there any calculation is available in Piping codes. In B31.3 the calculation available is for Branch Reinforcement.
Give me a solution to calculate the weld joint strength.

Best Regards,

Krishnakumar
Design Engineer (PIPING)
AKP Engineering & Consultant co.
Al-Khobar
Kingdom of Saudi Arabia