General spiral welded pipe mill line continuous testing to ensure the quality of the weld welding, which is another important feature of spiral welded pipe production different from the Longitudinal production. Continuous monitoring, the stability of the welding quality, welding grade guarantee inspection conducive to welding defects due to the limitations of the production process, Longitudinal extremely difficult to achieve uninterrupted inspection. This will enable increased welding hazards and the probability of the emergence of quality problems, and even affect the overall reliability of the pipeline running. The production qualification spiral welded pipe manufacturers should be held industrial production permit issued by the state. License system, which requires the production of spiral welded pipe manufacturers should first review by the authoritative certification bodies recognized by the national assessment, with the means of production, testing equipment, quality assurance system is running well, the product should be consistent with the level and quality of the national standard specification requirements certification, confirmed by the national industrial production permit office. Straight seam welded pipe spiral welded pipe manufacturers have perfect quality assurance system and quality control of operational procedures and manufacturers of industrial production permit requirements. Price analysis due to higher technical performance of hot-rolled coil material and production technology process requirements, on the one hand the domestic manufacturers compliant than the steel manufacturers less, on the other hand its production processes and quality level determines its market price is also high hot rolled steel plates. This spiral welded pipe market price is higher than the main reason for Longitudinal. For the composition of the steel pipe sales prices, the price of materials is the dominant or even the decisive factor. www.hbthgg.com www.thgangguan.com www.naimoguanjian.com www.hbbgc.com www.pvdfgc.com www.naimogd.com www.hbbengguan.com