Steel pipe to ASME B36.10M: dimensions by NPS and schedule

Pipe schedule chart ASME B36.10M – dimension table

from stock · to order · available on request – what is available how fast, we clarify on request.

Tolerances: outside diameter and wall thickness to ASTM A530 (pipe to A106), as the market states them. The wall may fall short of the nominal thickness by at most 12.5 % – the documentation gives no upper limit for the wall.

Dimensions: as the market supplies them – from manufacturers’ and suppliers’ documentation and from our own product data. Weights: from the same documentation, checked against the calculation from nominal dimensions (7.85 kg/dm³). STD = standard, XS = extra strong, XXS = double extra strong.

The table shows the market dimensions. What we carry from stock or to order is marked – the other sizes we procure on request.

Limit deviations by outside diameter

Wall thickness: shortfall below nominal only – the documentation gives no upper limit. In the drawing, “Show tolerances” sets these values against each dimension.

Welding ends to ASME B16.25

How the ends of pipes and fittings are prepared for butt welding – unless the order says otherwise:

• wall thickness below x (x = 0.19 in / 4.8 mm for carbon and ferritic alloy steel, 0.12 in / 3 mm for austenitic steel): ends cut square or slightly chamfered, at the manufacturer’s option – no bevel
• wall thickness x to 0.88 in (22 mm) inclusive: plain bevel 37.5° ± 2.5°, root face 0.06 in ± 0.03 in (1.6 mm ± 0.8 mm)
• wall thickness over 0.88 in (22 mm): compound bevel – 37.5° ± 2.5° from the root face up to 0.75 in (19 mm), then 10° ± 2.5° to the outside, root face 0.06 in ± 0.03 in (1.6 mm ± 0.8 mm)
• transition contours from the bevel into the body of the fitting follow ASME B16.9 (maximum envelope) – the catalogue refers to the standard
• minimum wall thickness at the end 87.5 % of nominal (pipe rule) – inside diameter and nominal wall at the ends are specified by the purchaser
• the same bevel geometry applies to pipe (B36.10M ends), fittings (B16.9) and welding neck flanges (B16.5 hub end) – B16.25 is the common end-preparation standard

How to read the table

NPS is a name, not a dimension: up to NPS 12 the outside diameter is larger than the number – NPS 4 measures 114.3 mm –, from NPS 14 the number is the outside diameter in inches. The outside diameter is the same for every schedule of a size; the schedule only changes the wall and with it the bore. More in the rule of thumb DN is not NPS.

STD and S40 are the same wall up to NPS 10, XS and S80 up to NPS 8 – the table lists both designations because both are ordered. Limit deviations for pipe are not set by B36.10M but by the material specification of the pipe (such as ASTM A106 or A333).

What B36.10M covers and how it relates to the European pipe standards is in the ASME B36.10M profile. Fittings for these pipes: butt-weld fittings to ASME B16.9. European pipe standards: Pipes.