Some specialized products include drain sewers helical welded pipes. At Shandong XINLONGTENG Metal Manufacturing Co., Ltd., helical welded pipes are the result of great technology. They are made with great pipes due to the helical welding technique. In helical welding, steel strips are welded to one another to make a pipe. This technique increases the pipe's structural integrity and a smooth surface to increase the flow of fluids within the pipe. Our helical welded pipes are made of the best steel to sustain the extreme conditions of sewer systems including the corrosion and other rough circumstances of sewer systems. Our commitment to quality helical welded pipes reflects in our quality control and testing protocols. Each pipe is meticulously inspected and tested to check compliance with the standards of ASTM, API and EN. Because of these quality control and testing dedication we are able to provide our drainage solutions to more than 30 countries.