EN 10220 Pipe Dimensions

What EN 10220 Governs

EN 10220 is a dimensional standard for seamless and welded steel tube: a list of permitted outside diameters and, at each one, the wall thicknesses that may be made. It fixes no steel grade, no pressure rating and no manufacturing route. Those live in the product standards that reference it — EN 10216 for seamless tube, EN 10217 for welded — which is why one diameter series serves structural, pressure and line-pipe work alike.

Its region is Europe, and by adoption a good deal further. The country table compiled for this site maps 56 of 157 countries to the EN family, though only Germany was checked against its own national standard; the rest are inferred from standards-bloc membership. This page covers Series 1, the preferred tier. EN 10220 also publishes Series 2 and Series 3, and the American 73.0 mm and 141.3 mm diameters do appear there — in the tier the standard itself describes as having very few standardised accessories.

The 35 Outside Diameters in Series 1

907 wall thicknesses in total, from 0.5 mm to 65 mm. The evidence column is per diameter: it says what could be confirmed about the walls published at that size, not about the standard as a whole.

The ID is not printed here because it is not a published figure in either system: it is the outside diameter minus twice the wall, and it changes with every wall in the row.

Where EN 10220 Parts From ASME B36.10M

Matching each European diameter to the closest American one sorts the 35 sizes into four groups. 24 are identical to an ASME B36.10M diameter. 7 differ by half a millimetre or less, which is two traditions rounding the same historic size differently rather than two different pipes. 2 genuinely diverge. 2 — 2235 mm and 2540 mm — have no American counterpart at all, because the ASME series stops below them.

The two real divergences are both familiar trade sizes. At DN 65 Europe says 76.1 mm and ASME says 73.0 mm, a 3.1 mm gap on a size both places sell as 2½ inch. At DN 125 Europe says 139.7 mm against 141.3 mm. Everything from DN 150 up agrees, which is not coincidence: the European series took the American diameters at the large end and kept its own, descended from the British gas thread, below.

Both American values do exist inside EN 10220, as Series 3 — its lowest tier. A 73.0 mm tube is orderable in Europe; it is simply not the preferred size, and standardised accessories for it are scarce. If your drawing gives a nominal designation rather than a diameter, read NPS to DN conversion first, then come back for the diameter that designation resolves to.

What We Could Verify, and What We Could Not

Of the 907 rows on this page, 825 are verified — each carried by at least 3 publishers that do not reproduce one another. 82 rest on no more than 2 publishers and are labelled single source wherever they appear above. None had to be marked as could not be verified, and none had a published mass suppressed.

The 82 single-source rows are not scattered through the table. Every one of them sits at the 4 largest diameters in the series — 1829, 2032, 2235, 2540 mm — where tube stops being a catalogue item and the publishers thin out.

One caveat matters more than the counts. None of the sources compiled for EN 10220 carried a mass column, so the arithmetic check that does most of the work elsewhere on this site could do none of it here. That check catches a mistyped wall thickness by testing it against a separately printed weight; with no weight to test against, agreement between publishers is the whole of the evidence. It is a weaker position than the arithmetic gives us on GB/T 17395 pipe dimensions, where every row carries a published mass that re-derives. Every mass shown for EN 10220 on this site is computed from M = (OD - t) * t * C, with C = 0.02466 kg/m for carbon steel.

Source count is also not source independence. Three of the publishers collected for this standard agree with each other because they reproduce the same erratum out of BS EN 10220 itself; counting them as three would have been counting one, so they were collapsed into one. How this data was verified sets out the rule and the rest of the method.

The Same Sizes Under Other Standards

EN 10220 is one of 8 standards compiled into the 9,892-row wall dataset behind this site, and the differences between them are mostly at the small end.

ASME B36.10M pipe dimensions

the American series, and the international default

JIS G3452 and G3454 pipe dimensions

Japan — its own diameters under borrowed schedule numbers

GOST pipe dimensions

Russia and the CIS — round metric diameters, no DN column

GB/T 17395 pipe dimensions

China — integers where Europe prints decimals

For the full side by side, see the pipe standards compared by country. For the American dimensions in inches, with schedules, steel pipe sizes.

Frequently Asked Questions

What does EN 10220 specify?

Outside diameters and wall thicknesses for seamless and welded steel tube, as a dimensional series. It carries no steel grade, no pressure rating and no manufacturing route — those belong to the product standards that reference it, EN 10216 for seamless tube and EN 10217 for welded. This page holds 907 wall thicknesses across 35 outside diameters from Series 1, the preferred tier.

Is EN 10220 the same as ASME B36.10M?

Above DN 150 they are effectively one series. 24 of the 35 European diameters appear in ASME B36.10M unchanged, and 7 more sit within half a millimetre of an American size. 2 genuinely differ, and both are below DN 150: 76.1 mm against 73.0 mm, and 139.7 mm against 141.3 mm.

Why is DN 65 pipe 76.1 mm in Europe and 73 mm in America?

Below DN 150 the European series descends from the British gas-thread tradition of ISO R7, while the American one comes from the wrought-iron sizes that became ANSI B2.1. From DN 150 upward Europe adopted the American diameters outright, which is why the two lists converge at the top and part at the bottom. At DN 65 the European figure is the one nearly every other national standard also chose.

How is the weight per metre of EN 10220 pipe calculated here?

From the mass formula alone: M = (OD - t) * t * C, with C = 0.02466 kg per metre for carbon steel at 7.85 g/cm³. None of the sources compiled for this standard carried a mass column, so there was no published figure to check the arithmetic against. Agreement between publishers is the whole of the evidence behind these dimensions.

Which countries use the EN pipe series?

The country table on this site maps 56 of the 157 countries in it to the EN family. Only Germany was checked against its own national standard; the rest are inferred from standards-bloc membership, and are labelled that way.