As per ASME B31.3 Table 311.1.1 PWHT shall be performed for the Weld Joint with Base Metal P Number (P) 1, Weld Metal Analysis Number (A) 1, and above 20mm thickness. LTCS Pipe A333 Gr.6 Welded with Consumables ER80SNi-1 and E8018-C3 has P Number (P) 1 and Weld Metal Analysis Number (A) 10...