Free tool · Pipe sizes
Convert pipe inch sizes to DN and mm.
1/2 inch is DN 15 with a 21.3 mm outside diameter, not 12.7 mm. Look up nominal sizes, outside diameters and walls for steel, copper, press, HT, KG and PE pipe, translate order lines and calculate pipe volume and weight.
What does the line say?
Paste an order or tender line. The tool reads the nominal size, inch size, dimensions, material and length and looks up the standard.
3/4" galvanised pipe 6 m
- Pipe system
- Threaded steel pipe, EN 10255
- Item
- Pipe
- Material
- Steel, galvanised
- Nominal size
- DN 20
- Inch
- 3/4"
- OD × wall
- 26.9 × 2.6 mm (Series M)
- Inside diameter
- 21.7 mm
- Volume
- 0.37 l/m
- Length
- 6 m
- 3/4" is a nominal size, not a measurement: as a length it would be 19.05 mm, but the pipe is 26.9 mm outside.
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DN, inch and mm across pipe systems
1/2 inch = DN 15
| Pipe system | DN | OD | Wall | ID | l/m | kg/m |
|---|---|---|---|---|---|---|
| Threaded steel pipe · EN 10255 | 15 | 21.3 | 2.6 M | 16.1 | 0.204 | 1.20 |
| Copper tube · EN 1057 | 15 | 18 | 1.0 | 16 | 0.201 | 0.48 |
| Stainless steel press pipe · EN 10312 | 15 | 18 | 1.0 | 16 | 0.201 | 0.43 |
| Carbon steel press pipe · EN 10305-3 | 15 | 18 | 1.2 | 15.6 | 0.191 | 0.50 |
Thread G/R 1/2": 20.955 mm major diameter, 14 threads per inch (1.814 mm pitch).
| PN | Flange Ø D | Bolt circle K | Bolts | Hole Ø L | Gasket inside | Gasket outside PN |
|---|---|---|---|---|---|---|
| PN 6 | 80 | 55 | 4 × M10 | 11 | 22 | 44 |
| PN 10 | 95 | 65 | 4 × M12 | 14 | 22 | 51 |
| PN 16 | 95 | 65 | 4 × M12 | 14 | 22 | 51 |
| PN 40 | 95 | 65 | 4 × M12 | 14 | 22 | 51 |
Pipe volume and pipe weight
- Inside diameter
- 16.1 mm
- Volume per metre
- 0.204 l/m
- Total volume
- 2.04 l
- Weight per metre
- 1.20 kg/m
- Weight empty
- 11.99 kg
- Weight filled with water
- 14.03 kg
Volume = π/4 · dᵢ² · L. Weight = π · (D − s) · s · ρ · L. Theoretical values from nominal sizes; galvanised pipe weighs a little more. Steel (7.85 kg/dm³)
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Pipe dimensions by standard
All sizes in mm. Inside diameter, volume and weight are calculated from outside diameter and wall. No liability; the standard and the manufacturer's data sheet apply.
Pipe inch sizes in DN and mm
Threaded steel pipe to EN 10255 (formerly DIN 2440/2441): inch size, DN, outside diameter and wall of series M (medium) and H (heavy), with the thread diameter to ISO 228-1/ISO 7-1.
| Inch | DN | OD | Wall M | Wall H | ID M | Thread Ø | TPI | Inch as length |
|---|---|---|---|---|---|---|---|---|
| 1/8" | DN 6 | 10.2 | 2.0 | – | 6.2 | 9.728 | 28 | 3.175 |
| 1/4" | DN 8 | 13.5 | 2.3 | – | 8.9 | 13.157 | 19 | 6.35 |
| 3/8" | DN 10 | 17.2 | 2.3 | 2.9 | 12.6 | 16.662 | 19 | 9.525 |
| 1/2" | DN 15 | 21.3 | 2.6 | 3.2 | 16.1 | 20.955 | 14 | 12.7 |
| 3/4" | DN 20 | 26.9 | 2.6 | 3.2 | 21.7 | 26.441 | 14 | 19.05 |
| 1" | DN 25 | 33.7 | 3.2 | 4.0 | 27.3 | 33.249 | 11 | 25.4 |
| 1 1/4" | DN 32 | 42.4 | 3.2 | 4.0 | 36.0 | 41.910 | 11 | 31.75 |
| 1 1/2" | DN 40 | 48.3 | 3.2 | 4.0 | 41.9 | 47.803 | 11 | 38.1 |
| 2" | DN 50 | 60.3 | 3.6 | 4.5 | 53.1 | 59.614 | 11 | 50.8 |
| 2 1/2" | DN 65 | 76.1 | 3.6 | 4.5 | 68.9 | 75.184 | 11 | 63.5 |
| 3" | DN 80 | 88.9 | 4.0 | 5.0 | 80.9 | 87.884 | 11 | 76.2 |
| 4" | DN 100 | 114.3 | 4.5 | 5.4 | 105.3 | 113.030 | 11 | 101.6 |
| 5" | DN 125 | 139.7 | 5.0 | 5.4 | 129.7 | 138.430 | 11 | 127.0 |
| 6" | DN 150 | 165.1 | 5.0 | 5.4 | 155.1 | 163.830 | 11 | 152.4 |
All pipe threads (G, R, Rp, Rc) with pitch and minor diameter
Standard: EN 10255:2004+A1:2007, ISO 228-1:2000
Nominal size DN across pipe systems
Outside diameter in mm per DN. The same nominal size has a different outside diameter in each pipe system.
| DN | Inch | Threaded steel pipe | Seamless/welded steel tube | Copper tube | Stainless steel press pipe | Carbon steel press pipe | HT drain pipe (PP) | KG sewer pipe (PVC-U) |
|---|---|---|---|---|---|---|---|---|
| DN 6 | 1/8" | 10.2 | – | – | – | – | – | – |
| DN 8 | 1/4" | 13.5 | – | – | – | – | – | – |
| DN 10 | 3/8" | 17.2 | – | 12 | – | 12 | – | – |
| DN 12 | – | – | – | 15 | 15 | 15 | – | – |
| DN 15 | 1/2" | 21.3 | – | 18 | 18 | 18 | – | – |
| DN 20 | 3/4" | 26.9 | – | 22 | 22 | 22 | – | – |
| DN 25 | 1" | 33.7 | 33.7 | 28 | 28 | 28 | – | – |
| DN 32 | 1 1/4" | 42.4 | 42.4 | 35 | 35 | 35 | 32 | – |
| DN 40 | 1 1/2" | 48.3 | 48.3 | 42 | 42 | 42 | 40 | – |
| DN 50 | 2" | 60.3 | 60.3 | 54 | 54 | 54 | 50 | – |
| DN 65 | 2 1/2" | 76.1 | 76.1 | 76.1 | 76.1 | 76.1 | – | – |
| DN 70 | – | – | – | – | – | – | 75 | – |
| DN 80 | 3" | 88.9 | 88.9 | 88.9 | 88.9 | 88.9 | – | – |
| DN 100 | 4" | 114.3 | 114.3 | – | 108 | 108 | 110 | 110 |
| DN 125 | 5" | 139.7 | 139.7 | – | – | – | 125 | 125 |
| DN 150 | 6" | 165.1 | 168.3 | – | – | – | 160 | 160 |
| DN 200 | – | – | 219.1 | – | – | – | – | 200 |
| DN 250 | – | – | 273 | – | – | – | – | 250 |
| DN 300 | – | – | 323.9 | – | – | – | – | 315 |
| DN 400 | – | – | – | – | – | – | – | 400 |
| DN 500 | – | – | – | – | – | – | – | 500 |
Standard: EN 10255, EN 10220, EN 1057, EN 10312, EN 10305-3, EN 1451-1, EN 1401-1
Seamless/welded steel tube EN 10220
Seamless and welded steel tube: outside diameters to EN 10220 (series 1), usual wall as in DIN 2448/DIN 2458.
| DN | OD | Wall | ID | l/m | kg/m |
|---|---|---|---|---|---|
| DN 25 | 33.7 | 2.6 | 28.5 | 0.638 | 1.99 |
| DN 32 | 42.4 | 2.6 | 37.2 | 1.087 | 2.55 |
| DN 40 | 48.3 | 2.6 | 43.1 | 1.459 | 2.93 |
| DN 50 | 60.3 | 2.9 | 54.5 | 2.333 | 4.11 |
| DN 65 | 76.1 | 2.9 | 70.3 | 3.882 | 5.24 |
| DN 80 | 88.9 | 3.2 | 82.5 | 5.346 | 6.76 |
| DN 100 | 114.3 | 3.6 | 107.1 | 9.009 | 9.83 |
| DN 125 | 139.7 | 4.0 | 131.7 | 13.623 | 13.39 |
| DN 150 | 168.3 | 4.5 | 159.3 | 19.931 | 18.18 |
| DN 200 | 219.1 | 6.3 | 206.5 | 33.491 | 33.06 |
| DN 250 | 273 | 6.3 | 260.4 | 53.256 | 41.44 |
| DN 300 | 323.9 | 7.1 | 309.7 | 75.331 | 55.47 |
Standard: EN 10220
Copper tube EN 1057
Copper tube EN 1057 with the walls and DN of German drinking water, heating and gas installation (DVGW GW 392:2009). Since mid-2013, 28 to 54 mm come only with a thinner wall; the earlier wall is in the “before 2013” column.
| DN | OD | Wall | Wall before 2013 | ID | ID before 2013 | l/m | kg/m |
|---|---|---|---|---|---|---|---|
| DN 10 | 12 | 1.0 | – | 10.0 | – | 0.079 | 0.31 |
| DN 12 | 15 | 1.0 | – | 13.0 | – | 0.133 | 0.39 |
| DN 15 | 18 | 1.0 | – | 16.0 | – | 0.201 | 0.48 |
| DN 20 | 22 | 1.0 | – | 20.0 | – | 0.314 | 0.59 |
| DN 25 | 28 | 1.0 | 1.5 | 26.0 | 25.0 | 0.531 | 0.75 |
| DN 32 | 35 | 1.2 | 1.5 | 32.6 | 32.0 | 0.835 | 1.13 |
| DN 40 | 42 | 1.2 | 1.5 | 39.6 | 39.0 | 1.232 | 1.37 |
| DN 50 | 54 | 1.5 | 2.0 | 51.0 | 50.0 | 2.043 | 2.20 |
| DN 65 | 76.1 | 2.0 | – | 72.1 | – | 4.083 | 4.14 |
| DN 80 | 88.9 | 2.0 | – | 84.9 | – | 5.661 | 4.86 |
Standard: EN 1057
Stainless steel press pipe EN 10312
Stainless steel pipe for press fittings (EN 10312, DVGW GW 541), e.g. 1.4401 or 1.4521.
| DN | OD | Wall | ID | l/m | kg/m |
|---|---|---|---|---|---|
| DN 12 | 15 | 1.0 | 13.0 | 0.133 | 0.35 |
| DN 15 | 18 | 1.0 | 16.0 | 0.201 | 0.43 |
| DN 20 | 22 | 1.2 | 19.6 | 0.302 | 0.63 |
| DN 25 | 28 | 1.2 | 25.6 | 0.515 | 0.81 |
| DN 32 | 35 | 1.5 | 32.0 | 0.804 | 1.26 |
| DN 40 | 42 | 1.5 | 39.0 | 1.195 | 1.53 |
| DN 50 | 54 | 1.5 | 51.0 | 2.043 | 1.98 |
| DN 65 | 76.1 | 2.0 | 72.1 | 4.083 | 3.72 |
| DN 80 | 88.9 | 2.0 | 84.9 | 5.661 | 4.37 |
| DN 100 | 108 | 2.0 | 104.0 | 8.495 | 5.33 |
Standard: EN 10312
Carbon steel press pipe EN 10305-3
Carbon steel pipe for press fittings, galvanised outside (EN 10305-3, e.g. E195/1.0034 or E235).
| DN | OD | Wall | ID | l/m | kg/m |
|---|---|---|---|---|---|
| DN 10 | 12 | 1.2 | 9.6 | 0.072 | 0.32 |
| DN 12 | 15 | 1.2 | 12.6 | 0.125 | 0.41 |
| DN 15 | 18 | 1.2 | 15.6 | 0.191 | 0.50 |
| DN 20 | 22 | 1.5 | 19.0 | 0.284 | 0.76 |
| DN 25 | 28 | 1.5 | 25.0 | 0.491 | 0.98 |
| DN 32 | 35 | 1.5 | 32.0 | 0.804 | 1.24 |
| DN 40 | 42 | 1.5 | 39.0 | 1.195 | 1.50 |
| DN 50 | 54 | 1.5 | 51.0 | 2.043 | 1.94 |
| DN 65 | 76.1 | 2.0 | 72.1 | 4.083 | 3.65 |
| DN 80 | 88.9 | 2.0 | 84.9 | 5.661 | 4.29 |
| DN 100 | 108 | 2.0 | 104.0 | 8.495 | 5.23 |
Standard: EN 10305-3
HT drain pipe (PP) EN 1451-1
PP drain pipe for buildings (HT pipe) to EN 1451-1.
| DN | OD | Wall | ID | l/m | kg/m |
|---|---|---|---|---|---|
| DN 32 | 32 | 1.8 | 28.4 | 0.633 | 0.15 |
| DN 40 | 40 | 1.8 | 36.4 | 1.041 | 0.19 |
| DN 50 | 50 | 1.8 | 46.4 | 1.691 | 0.25 |
| DN 70 | 75 | 1.9 | 71.2 | 3.982 | 0.39 |
| DN 100 | 110 | 2.7 | 104.6 | 8.593 | 0.82 |
| DN 125 | 125 | 3.1 | 118.8 | 11.085 | 1.07 |
| DN 150 | 160 | 3.9 | 152.2 | 18.194 | 1.72 |
Standard: EN 1451-1
KG sewer pipe (PVC-U) EN 1401-1
PVC-U sewer pipe (KG pipe) to EN 1401-1, stiffness classes SN 4 (SDR 41) and SN 8 (SDR 34).
| DN | OD | Wall SN 4 | Wall SN 8 | ID SN 4 | ID SN 8 | l/m SN 4 | kg/m SN 4 |
|---|---|---|---|---|---|---|---|
| DN 100 | 110 | 3.2 | – | 103.6 | – | 8.430 | 1.50 |
| DN 125 | 125 | 3.2 | – | 118.6 | – | 11.047 | 1.71 |
| DN 150 | 160 | 4.0 | 4.7 | 152.0 | 150.6 | 18.146 | 2.74 |
| DN 200 | 200 | 4.9 | 5.9 | 190.2 | 188.2 | 28.413 | 4.20 |
| DN 250 | 250 | 6.2 | 7.3 | 237.6 | 235.4 | 44.339 | 6.65 |
| DN 300 | 315 | 7.7 | 9.2 | 299.6 | 296.6 | 70.497 | 10.41 |
| DN 400 | 400 | 9.8 | 11.7 | 380.4 | 376.6 | 113.650 | 16.82 |
| DN 500 | 500 | 12.3 | 14.6 | 475.4 | 470.8 | 177.504 | 26.38 |
Standard: EN 1401-1
PE-HD drain pipe EN 1519-1
PE-HD drain pipe for buildings to EN 1519-1, ordered by outside diameter d; makers label DN differently.
| OD d | Wall | ID | l/m | kg/m | |
|---|---|---|---|---|---|
| 32 | 32 | 3.0 | 26.0 | 0.531 | 0.26 |
| 40 | 40 | 3.0 | 34.0 | 0.908 | 0.33 |
| 50 | 50 | 3.0 | 44.0 | 1.521 | 0.42 |
| 56 | 56 | 3.0 | 50.0 | 1.963 | 0.47 |
| 63 | 63 | 3.0 | 57.0 | 2.552 | 0.54 |
| 75 | 75 | 3.0 | 69.0 | 3.739 | 0.64 |
| 90 | 90 | 3.5 | 83.0 | 5.411 | 0.90 |
| 110 | 110 | 4.3 | 101.4 | 8.075 | 1.36 |
| 125 | 125 | 4.9 | 115.2 | 10.423 | 1.76 |
| 160 | 160 | 6.2 | 147.6 | 17.110 | 2.85 |
| 200 | 200 | 6.2 | 187.6 | 27.641 | 3.59 |
| 250 | 250 | 7.8 | 234.4 | 43.152 | 5.64 |
| 315 | 315 | 9.8 | 295.4 | 68.535 | 8.93 |
Standard: EN 1519-1
PE 100 pressure pipe EN 12201-2
PE 100 pressure pipe for water to EN 12201-2, ordered by outside diameter d. SDR 11 = PN 16, SDR 17 = PN 10.
| OD d | Wall SDR 11 | Wall SDR 17 | ID SDR 11 | ID SDR 17 | l/m SDR 11 | kg/m SDR 11 | |
|---|---|---|---|---|---|---|---|
| 20 | 20 | 2.0 | – | 16.0 | – | 0.201 | 0.11 |
| 25 | 25 | 2.3 | – | 20.4 | – | 0.327 | 0.16 |
| 32 | 32 | 3.0 | 2.0 | 26.0 | 28.0 | 0.531 | 0.26 |
| 40 | 40 | 3.7 | 2.4 | 32.6 | 35.2 | 0.835 | 0.40 |
| 50 | 50 | 4.6 | 3.0 | 40.8 | 44.0 | 1.307 | 0.62 |
| 63 | 63 | 5.8 | 3.8 | 51.4 | 55.4 | 2.075 | 0.99 |
| 75 | 75 | 6.8 | 4.5 | 61.4 | 66.0 | 2.961 | 1.38 |
| 90 | 90 | 8.2 | 5.4 | 73.6 | 79.2 | 4.254 | 2.00 |
| 110 | 110 | 10.0 | 6.6 | 90.0 | 96.8 | 6.362 | 2.98 |
| 125 | 125 | 11.4 | 7.4 | 102.2 | 110.2 | 8.203 | 3.87 |
| 140 | 140 | 12.7 | 8.3 | 114.6 | 123.4 | 10.315 | 4.83 |
| 160 | 160 | 14.6 | 9.5 | 130.8 | 141.0 | 13.437 | 6.34 |
| 180 | 180 | 16.4 | 10.7 | 147.2 | 158.6 | 17.018 | 8.01 |
| 200 | 200 | 18.2 | 11.9 | 163.6 | 176.2 | 21.021 | 9.88 |
| 225 | 225 | 20.5 | 13.4 | 184.0 | 198.2 | 26.590 | 12.51 |
| 250 | 250 | 22.7 | 14.8 | 204.6 | 220.4 | 32.878 | 15.40 |
| 280 | 280 | 25.4 | 16.6 | 229.2 | 246.8 | 41.259 | 19.30 |
| 315 | 315 | 28.6 | 18.7 | 257.8 | 277.6 | 52.198 | 24.45 |
| 355 | 355 | 32.2 | 21.1 | 290.6 | 312.8 | 66.326 | 31.02 |
| 400 | 400 | 36.3 | 23.7 | 327.4 | 352.6 | 84.187 | 39.40 |
Standard: EN 12201-2
Flange dimensions EN 1092-1 (PN 6, 10, 16, 40)
Connecting dimensions of steel flanges to EN 1092-1 (formerly DIN 2501): flange diameter D, bolt circle K, number and size of bolts, hole diameter L.
| DN | PN 6: D / K / Bolts / L | PN 10: D / K / Bolts / L | PN 16: D / K / Bolts / L | PN 40: D / K / Bolts / L |
|---|---|---|---|---|
| DN 15 | 80 / 55 / 4 × M10 / 11 | 95 / 65 / 4 × M12 / 14 | 95 / 65 / 4 × M12 / 14 | 95 / 65 / 4 × M12 / 14 |
| DN 20 | 90 / 65 / 4 × M10 / 11 | 105 / 75 / 4 × M12 / 14 | 105 / 75 / 4 × M12 / 14 | 105 / 75 / 4 × M12 / 14 |
| DN 25 | 100 / 75 / 4 × M10 / 11 | 115 / 85 / 4 × M12 / 14 | 115 / 85 / 4 × M12 / 14 | 115 / 85 / 4 × M12 / 14 |
| DN 32 | 120 / 90 / 4 × M12 / 14 | 140 / 100 / 4 × M16 / 18 | 140 / 100 / 4 × M16 / 18 | 140 / 100 / 4 × M16 / 18 |
| DN 40 | 130 / 100 / 4 × M12 / 14 | 150 / 110 / 4 × M16 / 18 | 150 / 110 / 4 × M16 / 18 | 150 / 110 / 4 × M16 / 18 |
| DN 50 | 140 / 110 / 4 × M12 / 14 | 165 / 125 / 4 × M16 / 18 | 165 / 125 / 4 × M16 / 18 | 165 / 125 / 4 × M16 / 18 |
| DN 65 | 160 / 130 / 4 × M12 / 14 | 185 / 145 / 8 × M16 / 18 | 185 / 145 / 8 × M16 / 18 | 185 / 145 / 8 × M16 / 18 |
| DN 80 | 190 / 150 / 4 × M16 / 18 | 200 / 160 / 8 × M16 / 18 | 200 / 160 / 8 × M16 / 18 | 200 / 160 / 8 × M16 / 18 |
| DN 100 | 210 / 170 / 4 × M16 / 18 | 220 / 180 / 8 × M16 / 18 | 220 / 180 / 8 × M16 / 18 | 235 / 190 / 8 × M20 / 22 |
| DN 125 | 240 / 200 / 8 × M16 / 18 | 250 / 210 / 8 × M16 / 18 | 250 / 210 / 8 × M16 / 18 | 270 / 220 / 8 × M24 / 26 |
| DN 150 | 265 / 225 / 8 × M16 / 18 | 285 / 240 / 8 × M20 / 22 | 285 / 240 / 8 × M20 / 22 | 300 / 250 / 8 × M24 / 26 |
| DN 200 | 320 / 280 / 8 × M16 / 18 | 340 / 295 / 8 × M20 / 22 | 340 / 295 / 12 × M20 / 22 | 375 / 320 / 12 × M27 / 30 |
| DN 250 | 375 / 335 / 12 × M16 / 18 | 395 / 350 / 12 × M20 / 22 | 405 / 355 / 12 × M24 / 26 | 450 / 385 / 12 × M30 / 33 |
| DN 300 | 440 / 395 / 12 × M20 / 22 | 445 / 400 / 12 × M20 / 22 | 460 / 410 / 12 × M24 / 26 | 515 / 450 / 16 × M30 / 33 |
Standard: EN 1092-1:2018
Flange gaskets EN 1514-1 (type IBC)
Flat gaskets inside the bolt circle for EN 1092-1 flanges: inside diameter d1 and outside diameter d2 per PN.
| DN | Gasket inside d1 | Gasket outside PN 6 d2 | Gasket outside PN 10 d2 | Gasket outside PN 16 d2 | Gasket outside PN 40 d2 |
|---|---|---|---|---|---|
| DN 15 | 22 | 44 | 51 | 51 | 51 |
| DN 20 | 27 | 54 | 61 | 61 | 61 |
| DN 25 | 34 | 64 | 71 | 71 | 71 |
| DN 32 | 43 | 76 | 82 | 82 | 82 |
| DN 40 | 49 | 86 | 92 | 92 | 92 |
| DN 50 | 61 | 96 | 107 | 107 | 107 |
| DN 65 | 77 | 116 | 127 | 127 | 127 |
| DN 80 | 89 | 132 | 142 | 142 | 142 |
| DN 100 | 115 | 152 | 162 | 162 | 168 |
| DN 125 | 141 | 182 | 192 | 192 | 194 |
| DN 150 | 169 | 207 | 218 | 218 | 224 |
| DN 200 | 220 | 262 | 273 | 273 | 290 |
| DN 250 | 273 | 317 | 328 | 329 | 352 |
| DN 300 | 324 | 373 | 378 | 384 | 417 |
Standard: EN 1514-1:1997
Why this tool
Built for the sizes orders arrive in.
01
1/2 inch is not 12.7 mm
Inch sizes name a pipe, they don’t measure it. The tool shows the real outside diameter and wall per system: DN 50 is 60.3 mm in steel, 54 mm in copper and 50 mm as HT pipe.
02
Nine pipe systems, one lookup
Threaded and seamless steel, copper, stainless and carbon steel press pipe, HT, KG and PE pipe, plus G and R threads and EN 1092-1 flanges with gaskets.
03
Every value checked twice
Each dimension follows the standard named on its table and matches at least two independent public sources, such as maker data sheets and stockist tables.
Mercura reads requests and orders like these for plumbing and HVAC wholesale and civil engineering supply. See how Sanitär-Heinze, Muffenrohr and Danfoss work with it, and how Mercura handles quotes and tenders and order processing. More background: AI in plumbing and HVAC wholesale and faster quotes in civil engineering supply.
FAQ
Questions about pipe sizes.
As a length, 1/2 inch is 12.7 mm. For pipes, 1/2" is a nominal size: a 1/2 inch threaded steel pipe (DN 15) is 21.3 mm outside, and its thread is 20.955 mm. The inch size goes back to old inside diameters and matches no dimension today.
3/4 inch is DN 20. The threaded steel pipe to EN 10255 is 26.9 mm outside with a 2.6 mm wall in series M. Likewise 1/2" is DN 15, 1" DN 25, 1 1/4" DN 32, 1 1/2" DN 40 and 2" DN 50.
DN (diamètre nominal, nominal size) is a rounded number without a unit that names a pipe size. It is not a measurement: DN 50 is 60.3 mm outside as steel pipe, 54 mm as copper tube and 50 mm as HT drain pipe. Orders need the outside diameter and wall.
Litres per metre = π/4 × inside diameter² (in mm) / 1000. A 22 x 1 copper tube has a 20 mm bore, so it holds 0.314 l per metre and 3.14 l in 10 m. The calculator on this page does this for every pipe.
Weight per metre = π × (outside diameter − wall) × wall × density / 1000, in mm and kg/dm³. Steel is 7.85 kg/dm³, stainless steel about 8.0 and copper 8.9. A DN 15 threaded pipe (21.3 x 2.6) weighs about 1.2 kg per metre.
Yes. 5/4" is common German trade notation for 1 1/4" (DN 32), and 6/4" means 1 1/2" (DN 40).
Mercura reads incoming requests, orders and tenders, recognises the size, material and standard of every line, suggests the matching product from your catalog and writes the quote into your ERP.