General, spiral welded pipe mill line continuous inspection to ensure weld the welding quality, which is another important feature of spiral welded pipe production to distinguish it from welded pipe production. Continuous inspection is conducive to the monitoring of weld defects, the stability of the welding quality, welding grade guarantee. 
 Due to the limitations of the production process, Longitudinal extremely difficult to achieve uninterrupted inspection. This will allow welding hidden quality problems, increased risk, even affect the overall reliability of the pipeline run. 
 ? Production qualification 
 Spiral welded pipe manufacturer should be held by the industrial production permit issued by the state. License system, which requires the production of spiral welded pipe manufacturers should first authoritative review of the verification agency recognized by the national assessment, with the means of production, test equipment, quality assurance system is good and effective, the product should be consistent with the level of national standards and quality specifications requirements, certification of national industrial production license office confirmed. Spiral welded pipe manufacturers have a quality assurance system and quality control of operational procedures. 
 Longitudinal manufacturer of industrial products production license requirements. 
 ? Price analysis 
 Higher hot-rolled coil of material performance and production technical process, so the one hand, the domestic manufacturers meet the standards than the steel plate manufacturer less the other hand, their production processes and quality level of its market price is also higher than the heat rolled steel plate. This is the main reason for the spiral welded pipe market price is higher than the Longitudinal For the composition of the steel pipe sales price, the price of materials is the dominant or even the decisive factor. 
 By examining the differences in price for spiral welded pipe and Longitudinal Longitudinal spiral welded pipe price slightly higher than is due to the production of the main material of the price difference. Steel pipe production, however, only the project part, taking into account the overall project quality, project cost and other factors, spiral welded pipe still has the overall advantage. http://www.hbthgg.com spiral steel pipe http://www.thgangguan.com spiral steel pipe http://www.naimoguanjian.com pump tube