GB/T 26303.1-2010Measuring method for dimensions and shapes of wrought copper and copper alloy - Part 1: Tube (English PDF)

2.1 Wall thickness

Same cross-section, the outer edge of the pipe took the normal distance from one point to the inner edge.

2.2 An outer diameter outsidediamter

Same cross-section through the pipe center distance between the two outer edges.

2.3 The inner diameter insidediamter

One cross-section through the pipe center distance between the two inner edge.

2.4 Mean outside diameter

Mean a cross-section of any of the maximum outside diameter and minimum diameter.

2.5 Average inner diameter

A cross-section of any of the maximum and minimum internal diameter of the inner diameter of the average.

2.6 Average thickness

Any maximum wall thickness and a minimum of the average cross-section.

2.7 Roundness

Either circular pipe cross section of the difference between the maximum and minimum outside diameter.

2.8 Straightness

Straight pipe at a predetermined maximum distance from the centerline of the pipe off-axis length.

2.9 Length lengths

The distance between the other end of the straight pipe from one end of the pipe, along a direction parallel to the axis.

2.10 Twisting degree twist

Shaped pipe within a certain length of two cross-section relative torsional angle (or the maximum vertical distance).

GB/T 33948.1-2017 | GB/T 33370-2016 | GB/T 26022-2010 | GB/T 33817-2026 | GB/T 26305-2010 | GB/T 26303.3-2010 | […]