The pipe must be marked with the manufacturer's name, material name, specification, wall thickness, production standard (national standard or enterprise standard), production line code, production date, etc.

Some manufacturers also marked the inspector number.

So we can know what kind of pipe it is and how thick it is. If there is a cross-shipment, the manufacturer can find out who is the cross-shipment. If there is any quality problem with this batch or this pipe, we can also find out who produced it by the production line code as the spot and directly find out the responsible person. There are many benefits.