Stainless steel pipe to ASME B36.19M: dimensions by NPS and schedule

Stainless steel pipe schedule chart ASME B36.19M – 5S, 10S, 40S, 80S

available on request – we state the lead time with the quotation.

Tolerances: outside diameter and wall thickness to ASTM A999 (pipe to A312) for NPS 1/2 to 30, 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. Weights: from the same documentation, checked against the calculation from nominal dimensions (austenitic steel). The schedules of B36.19M carry an S: 5S, 10S, 40S, 80S.

We procure stainless pipe to ASME B36.19M on request – the table shows the market dimensions so that you can settle size and schedule beforehand.

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

The outside diameters are the same as for steel pipe to ASME B36.10M – NPS 4 measures 114.3 mm. The walls of the S schedules are values of their own: 40S matches S40 up to NPS 10, 80S matches S80 up to NPS 8 – above that the S walls are thinner. More in the rule of thumb DN is not NPS.

Limit deviations are set by the material specification of the pipe (such as ASTM A312), not by B36.19M. What the standard covers is in the ASME B36.19M profile. Steel pipe: ASME B36.10M.