Gas pipeline and steel water pipes can be galvanized and not galvanized. They are made by forming from a barbell tape. When welding gas pipes, the seam is most often carried out. This allows for the tightness, safety and durability of such products. In order to guarantee the quality of welding of such pipes, conduct a rare of special measures: carry out an ultrasound check of the seam, carry out a visual inspection, and also conduct hydraulic tests.