Spiral welded pipe industry implementation standards 1. Execution standard of spiral welded pipe Spiral submerged arc welded steel pipe SY5036-83 for pressure fluid transportation is mainly used for conveying oil and natural gas pipelines; spiral high frequency welded steel pipe SY5038-83 for pressure fluid conveying, welded by high frequency lap welding method, Spiral seam high frequency welded steel pipe for pressurized fluid conveying. The steel pipe has strong pressure bearing capacity and good plasticity, which is convenient for welding and processing. Generally, the spiral submerged arc welded steel pipe SY5037-83 for low-pressure fluid transportation is made of double-sided automatic submerged arc welding or single-sided welding for water and gas. Submerged arc welded steel pipe for general low pressure fluid transportation such as air and steam. The common standards for spiral steel pipes are generally divided into: SY/T5037-2000 (partial standard, also called spiral seam submerged arc welded steel pipe for ordinary fluid conveying pipeline), GB/T9711.1-1997 (national standard, also called oil and gas industry transportation) Technical requirements for steel pipe delivery Part I: Class A steel pipe (to the current strict requirements GB/T9711.2 Class B steel pipe)), API-5L (American Petroleum Institute, also called pipeline steel pipe; which is divided into PSL1 and PSL2 Level), SY/T5040-92 (spiral submerged arc welded steel pipe for piles). National Standard GB/T9711.1 - 1997 Ministry of Petroleum Industry Standard SY/T5037-2000 US APISPEC 5L welded steel pipe standard 2, the material of the spiral welded pipe Q235A, Q235B, 0Cr13, 1Cr17, 00Cr19Ni11, 1Cr18Ni9, 0Cr18Ni11Nb, 16Mn, 20#, Q345, L245, L290, 40#, 60#, X42, X46, X70, X80. 3. Production equipment of spiral welded pipe: Uncoiler: Double cone uncoiler, detachable 32 tons of heavy steel coil. Steel belt winch: flattened for seven rolls, plate thickness up to 20mm Shearing machine: can cut 2000mm*20mm coil Butt welding machine: welding just lead Disc shear: cut the edge of the steel plate to the specified size Milling machine: machined steel plate ≥10mm into the required groove Vertical roller device: to ensure that the steel plate runs along the delivery line Delivery machine: two-roller conveyor is the main driving force for forming Guide plate: enter the molding machine to ensure the balance of the steel plate Molding machine and bridge, output roller, three-bar bending plate, outer roller sizing Forming machine can form Φ219-Φ2520mm steel pipe Internal and external welding device: internal welding monofilament, external welding double wire, choose Lincoln Welder, and infrared thermal imaging internal welding tracking control system Flux recovery device: recovery of post-weld flux Automatic external welding device: repairing weld defects Flat head to edge machine: guaranteed to meet standard pipe end requirements Hydraulic test machine: 100% hydraulic test Weighing measuring device: weighing and measuring the length of the steel pipe 4. Production qualification Spiral welded pipe manufacturers shall hold production licenses for industrial products issued by the state. The license system requires that the manufacturer of the spiral welded pipe should first pass the examination and assessment of the authoritative verification institution recognized by the state, and have the corresponding production means and inspection equipment. The quality assurance system operates well and effectively, and the product should meet the requirements of the national standard level and quality specifications. After the confirmation of the National Industrial Product Production License Office, the certificate will be issued. Therefore, spiral welded pipe manufacturers have relatively complete quality assurance systems and quality control operating procedures. 5, price analysis Due to the high technical quality and high technical requirements of the hot rolled coil, on the one hand, the domestic manufacturers meet the standards, and the production technology and quality grade determine that the market price is higher than the heat. Rolled steel plate. This is the main reason why the market price of spiral welded pipe is higher than that of straight welded pipe. For the composition of the sales price of steel pipes, material prices are dominant or even decisive factors. Careful examination of the price difference between spiral welded pipe and straight welded pipe, the price of spiral welded pipe is slightly higher than that of straight welded pipe due to the difference in price of main material. However, steel pipe production is only a part of the project. If considering the overall quality of the project and the overall cost of the project, the spiral welded pipe still has an overall advantage. Makeup Train Case,Makeup Brush Case,Professional Makeup Case RUNVA ENTERPRISES LIMITED , http://www.toolboxcn.com