Steel tube size series

Pipe sizing is not arbitrary but should follow a specific sizing system. The steel pipe size is millimeters, although some countries use inches (English inch, or German Zoll). Therefore, there are two groups of steel pipes -TUBE and PIPE. Tubes are used in the mechanical or energy industry and are measured in inches to describe the outer diameter. PIPE is used for pipes of different media. PIPE size is the nominal size of steel PIPE. The approximate value of inner diameter can also be found for a 12-inch steel pipe. After converting PIPE size to mm, it is the preferred PIPE outer diameter line (the first line uses EN10220, DIN2448, etc.). That doesn't mean we don't use the second and third lines. The second and third-row dimensions are TUBE standards for energy construction and mechanical steel pipes.

Steel tube thick wall series

Steel tube thick wall series from the British units of weights and measures, then use fractions to express the size. PIPE wall thickness by Schedule series (40,60,80,120), and connected to weight series (STD, XS, XXS). These values are converted to millimeters as part of the tube wall thickness series. Note: The size -Schedule40 value is not constant, but is to be watched for outside diameters.

BWG and SWG scales are used for TUBE wall thickness values. These values become part of the steel tube thick wall series when converted to millimeters. Precision steel tubes used in Europe and countries using the international system of units are rounded approximations for outer diameter and wall thickness dimensions.

Ellipticity of steel tube

Ellipticity is the value difference between the minimum and maximum outer diameters of a section. The ellipticity must be within the outside diameter tolerance.

Ellipticity = maximum location - minimum location (absolute value in mm) O = ODmax - ODmin (absolute value in mm)

Ellipticity = 100x(location maximum - outside diameter minimum)/outside diameter (use %) O = 100.(ODmax -- ODmin)/OD (in %)

The eccentricity of steel tube

(Mean deviation) is the difference between the median value of the outside diameter and the inside diameter. The eccentricity must be within the thick-wall tolerance, and it can be calculated in a long cross-section:

(maximum thick-minimum thick-wall value) / 2 (in mm absolute value) (WTmax -- WTmin) / 2 (absolute value in mm)

(Maximum thickness - minimum thickness)/((maximum thickness + minimum thickness) x 100 (with %) (WTmax -- WTmin)/(WTmax + WTmin).100 (in %)

Outer diameter inner diameter thick wall tolerance is valid for only two dimensions. The third size is available for precision tubes only.

Deviation of steel pipe straightness

Represents the maximum deviation between the two ends of the steel pipe and the connecting line between the two ends. L is the length of the steel pipe. The commonly used straightness is 3 millimeters to 1 meter.

e/L x 100 %

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