helical spiral steel pipe Also known as spiral or helical spiral steel pipe, is a low-carbon steel or low alloy steel strip at a certain helix angle (called molding angle) rolled into a tube and then the tube seam welded together made it can narrow strip production of large diameter steel pipe. Spiral pipe is mainly used for oil and gas pipelines. There spiral welding and double-sided welding, pipe should ensure that hydrostatic test, weld tensile strength and the cold bending performance compliance.
Features: straight seam welded pipe production process is simple, high production efficiency, low cost, rapid development. Spiral Welded Longitudinal generally higher than, can narrow the billet production of large diameter pipe, you can also use the same width of the billet production of different pipe diameter pipe. However, compared with the same length of straight seam pipe, weld length of 30 to 100%, and lower production rate. Therefore, smaller diameter pipe is mostly a straight seam welding, large diameter spiral welded pipe for the most part.
use: Spiral mainly used in water engineering, petrochemical industry, chemical industry, power industry, agricultural irrigation, urban construction, it is one of 20 key product of development. For the transport of liquids: water supply, drainage, sewage treatment works, lose mud, sea water. Used for gas transportation: gas, steam, liquefied petroleum gas. For structural purposes: as piling pipe for bridges; piers, roads, building structures tube, pipe and other marine piling.
Standard: Common standards now generally divided into spiral: SY / T5037-2000 (Ministry of standard, also known as general fluid pipes with spiral submerged arc welded pipe), GB / T9711.1-1997 (GB, also known as the oil and gas the first part of the industrial conveyor pipe technical delivery conditions: a grade steel (to the current demanding a GB / T9711.2 B grade steel)), API-5L (American petroleum Institute, also known as line pipe; which is divided into PSL1 and PSL2 two levels), SY / T5040-92 (pile with spiral submerged arc welded pipe).
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