The spiral pipe size inspection are: the wall thickness, outer diameter, length, curvature, ovality, end face groove and obtuse angle of the spiral pipe, and the cross-sectional shape of the special-shaped steel pipe.

1. The commonly used inspection tool for steel pipe wall thickness is the wall thickness micrometer. During inspection, use a qualified micrometer to measure the wall thickness of the steel pipe one by one. The end side measurement of the spiral pipe should be no less than 8 points. The modern seamless steel pipe production unit uses ultrasonic equipment to detect and record the full length of the steel pipe wall thickness.

2. The tools used for the inspection of the outer diameter and ovality of the steel pipe are calipers and vernier calipers. When measuring, the caliper or vernier caliper should be perpendicular to the axis of the steel pipe, and the steel pipe should be slowly rotated to measure the maximum and minimum points of the section where the steel pipe is located. When it is found that the outer diameter of the steel pipe is too large or too small, it should be marked. For steel pipes that need to be checked for pipe end ovality, ring gauges are generally used to check. At present, an automatic diameter measuring device can also be used to detect the outer diameter of the steel pipe.