NFPA 59A requires 30%RT butt welds ( above -29C) as per 9.7.3.2 (B) Pressure piping operating above ?20°F (?29°C) shall have 30 percent of each day’s circumferentially welded pipe joints nondestructively tested over the entire circumference, in accordance with ASME B 31.3.
1- is Fuel Gas...