Size deviation mainly in the SSAW steel pipe is straightness, roundness, aspects of uneven thickness.
In most cases, straightness tolerance for the use of spiral steel pipe under large, but the manufacturing standards for spiral pipe straightness requests, if the predetermined value is exceeded, would constitute a reason to return, and therefore, spiral pipe plant should still be noted. Roundness tolerance will affect the use of spiral steel pipe, mainly in the group of the wrong side of the welding head. Roundness tolerance has led to the wrong side of the welded joint will not only reduce the pressure capability, but also stress concentration. When the site Group, roundness some pipe can be corrected. Outside diameter deviation and the impact on the spiral steel pipe used roundness tolerance fairly.
Non-uniform wall thickness generally easy to be ignored, and many spiral steel pipe standards are not clearly defined. If the wall thickness Uneven, it will not only result set to the wrong side of the joint, but also the secondary deformation processing (such as steel pipe manufacturing pipe) adversely affected.
