The spiral welded pipe (SSAW) is mainly used in tap water engineering, petrochemical industry, chemical industry, electric power industry, agricultural irrigation and urban construction. It is one of the twenty key products developed by China. For liquid transport use: water supply, drainage, sewage treatment works, mud transport, marine water transport. For gas transportation: gas, steam, liquefied petroleum gas. For structural use: as a pile driving pipe, as a bridge; piers, roads, building structures, marine piling pipe. Spiral welded pipes undergo stringent physicochemical tests before they are put into use. Spiral seam submerged arc welded pipe for pressure-bearing fluid transportation is mainly used for pipelines conveying petroleum and natural gas. The steel pipe has strong pressure bearing capacity and good plasticity, which is convenient for welding and processing and forming. In general, spiral submerged arc welded steel pipe for low pressure fluid transportation adopts double-sided automatic Submerged-arc welded or single-sided welding method for submerged-arc welded steel pipes used for the transport of low pressure fluids such as water, gas, air and steam.
For gas transportation: gas, steam, liquefied petroleum gas. For structural use: as a pile driving pipe, as a bridge; piers, roads, building structures, marine piling pipe.
Spiral pipe with strong pressure bearing capacity, good plasticity, easy for welding and processing and molding; general low pressure fluid conveying spiral steel pipe, using double-sided automatic submerged arc welding or single-sided welding method for the general low pressure of water, gas, air and steam submerged-arc welded steel pipe, straight seam steel pipe for fluid transport. Nowadays, the commonly used standards for large-diameter spiral steel pipes are generally divided into (partial standard, also known as spiral pipe for ordinary fluid transmission pipelines), national standard, also called oil and gas industry transmission steel pipe.
Technical condition:
Grade A steel pipe (up to now demanding steel pipe )) (American Petroleum Institute, also known as pipeline steel pipe; which is divided into two levels) large-caliber coated steel pipe is made by coating plastic on the basis of large-diameter spiral welded pipe and high-frequency welded pipe, if the diameter of the steel pipe reaches 1200mm, According to different needs can be coated with PVC (polyvinyl chloride), polyethylene (PE), epoxy resin and other various properties of the plastic coating, good adhesion, corrosion resistance, resistant to strong acids, alkalis and other chemical corrosion, non-toxic, non-corrosive, wear-resistant, impact-resistant, strong penetration resistance, smooth surface of the pipeline, no adhesion of any substance, can reduce the resistance during transportation, increase the flow rate and transmission efficiency, and reduce the transmission pressure loss. There is no solvent in the coating, no leakage of substances, so it will not contaminate the transported media, so as to ensure the purity and sanitation of the fluid. It can be used alternately in the range of -40°C to +80°C, without aging, because it does not crack, it can be used in harsh environments such as cold areas. Large diameter coated steel pipes are widely used in tap water, natural gas, petroleum, chemical, pharmaceutical, telecommunications, electric power, marine and other engineering fields.
