... .Stand higher strength than longitudinal-seam pipe 3.Best quality Large diameter spiral welded pipe ItemDetailsOuter Diameter219----3000mmWall Thickness6mm----25mmLengthas per your requirementUsageLiquid ... ,Charpy Impact Test,Metallographic ExaminationFinal Product TestHydraulic Test, On-line and off-line Ultrasonic Test,Tensile Test ,Yeild Strength,Elogation,Hardness Test ...