What is the standard for placing marks in the flaw detection center of special equipment?

It is stipulated that flaw detection must be carried out for welds and T-joints that are not 1% radiographic. Usually, the girth seam starts with the center of the T-joint and extends from left to right. According to the equipment network, the marking standard of flaw detection center for special equipment is that welds and T-joints that are not 1% radiographic must be inspected. Usually, the girth seam starts with the center of the T-joint and extends from left to right. Special equipment refers to boilers, pressure vessels (including gas cylinders), pressure pipes, elevators, lifting machinery, passenger ropeways, large amusement facilities and special motor vehicles in the field (factory) which are related to life safety and great danger.