Weld has marked the site of continuous acoustic detection, manual ultrasonic and X-ray review, if there are defects after repair again after destructive testing until the confirmation of the defect has been eliminated. Steel butt weld, and intersect with spiral weld small joint where the pipe all through the X-ray television or film examination. Each spiral steel pipe hydrostatic test pressure radial seal. Test pressure and time by a spiral pipe pressure microcomputer detection device strictly controlled. Test parameters are automatically printed record. Pipe end machining, so that end vertical bevel and accurate control of the blunt edge. Standards and classification standards are now commonly used standards are generally divided into spiral: SY/T5037-2000 (Ministry of standard, also known as general fluid pipes with spiral submerged arc welded spiral steel pipe), GB/T9711.1-1997 (GB, also called spiral pipe transporting oil and gas industry Technical delivery conditions Part I: A grade spiral steel pipe (to the current demanding a GB/T9711.2 B grade spiral steel)), API-5L (American Petroleum Institute, also known as spiral steel pipe ; which is divided into two levels PSL1 and PSL2), SY/T5040-92 (pile with spiral submerged arc welded spiral steel pipe). Classification pressure transmission fluid with spiral submerged arc welded pipe is mainly used to transport oil, natural gas pipelines, spiral steel pipe pressure capability, plastic, and easy welding and machining molding; generally low pressure liquid delivery spiral submerged arc welded spiral steel pipe used double-sided automatic submerged arc welding or welding into the legal system for water, gas, air and steam low pressure liquid delivery SAW spiral pipes. www.hbthgg.com www.thgangguan.com www.naimoguanjian.com www.bengguan168.com www.hbbengguan.com www.hbbgc.com www.pvdfgc.com www.naimogd.com www.naimogd.com