Plant Engineering Infobase · Chapter 07 of 14
Piping
The basic standard for metallic industrial piping is the DIN EN 13480 series (2024-12 edition). Piping specs are structured according to DIN 21057, the successor to PAS 1057. The current overview of standards is in Chapter 14.
Overview
Outside diameters and wall thicknesses
Outside diameters according to DIN EN 10220 (series 1) compared with ASME B36.10 (steel) and ASME B36.19 (stainless steel, series with S). Values in mm.
| DN | NPS | OD EN | OD ASME | 5S | 10S | STD | XS | Sch 160 | XXS |
|---|---|---|---|---|---|---|---|---|---|
| 15 | ½ | 21.3 | 21.3 | 1.65 | 2.11 | 2.77 | 3.73 | 4.78 | 7.47 |
| 20 | ¾ | 26.9 | 26.7 | 1.65 | 2.11 | 2.87 | 3.91 | 5.56 | 7.82 |
| 25 | 1 | 33.7 | 33.4 | 1.65 | 2.77 | 3.38 | 4.55 | 6.35 | 9.09 |
| 32 | 1¼ | 42.4 | 42.2 | 1.65 | 2.77 | 3.56 | 4.85 | 6.35 | 9.70 |
| 40 | 1½ | 48.3 | 48.3 | 1.65 | 2.77 | 3.68 | 5.08 | 7.14 | 10.15 |
| 50 | 2 | 60.3 | 60.3 | 1.65 | 2.77 | 3.91 | 5.54 | 8.74 | 11.07 |
| 65 | 2½ | 76.1 | 73.0 | 2.11 | 3.05 | 5.16 | 7.01 | 9.53 | 14.02 |
| 80 | 3 | 88.9 | 88.9 | 2.11 | 3.05 | 5.49 | 7.62 | 11.13 | 15.24 |
| 100 | 4 | 114.3 | 114.3 | 2.11 | 3.05 | 6.02 | 8.56 | 13.49 | 17.12 |
| 125 | 5 | 139.7 | 141.3 | 2.77 | 3.40 | 6.55 | 9.53 | 15.88 | 19.05 |
| 150 | 6 | 168.3 | 168.3 | 2.77 | 3.40 | 7.11 | 10.97 | 18.26 | 21.95 |
| 200 | 8 | 219.1 | 219.1 | 2.77 | 3.76 | 8.18 | 12.70 | 23.01 | 22.23 |
| 250 | 10 | 273.0 | 273.0 | 3.40 | 4.19 | 9.27 | 12.70 | 28.58 | 25.40 |
| 300 | 12 | 323.9 | 323.9 | 3.96 | 4.57 | 9.53 | 12.70 | 33.32 | 25.40 |
| 350 | 14 | 355.6 | 355.6 | 3.96 | 4.78 | 9.53 | 12.70 | 35.71 | – |
| 400 | 16 | 406.4 | 406.4 | 4.19 | 4.78 | 9.53 | 12.70 | 40.49 | – |
| 450 | 18 | 457.0 | 457.0 | 4.19 | 4.78 | 9.53 | 12.70 | 45.24 | – |
| 500 | 20 | 508.0 | 508.0 | 4.78 | 5.54 | 9.53 | 12.70 | 50.01 | – |
| 600 | 24 | 610.0 | 610.0 | 5.54 | 6.35 | 9.53 | 12.70 | 59.54 | – |
Support spans
The support span is the distance between two pipe supports. For straight pipe runs, it is determined from the distributed load q: dead weight of the pipe, contents (operating fluid or water during the pressure test), insulation, cladding and additional loads such as heat tracing or snow. Point loads such as valves are added.
| Criterion | Verification | Typical limit |
|---|---|---|
| Deflection | f = kf · q · L⁴ / (E · I) | Project specification, e.g. 5 mm or L/500; drainage and appearance |
| Stress | σ = p · D / (4 · e) + M / Z ≤ f (DIN EN 13480-3, Section 12.3.2, loads from pressure and weight) | allowable stress at operating temperature |
| Slope | Slope of the deflection curve at the support ≤ slope of the line | prevents water pockets in sloped lines |
| Structural | Grid dimension of the steel structure, pipe racks | z. B. 6 m, 12 m |
Changes of direction, branches, flanges and heavy valves shorten the support span. Thermal expansion, support loads and stability of the substructure are verified in the pipe stress analysis.
Calculate support spans › Support Span Calculator with support span sheet – materials and wall thicknesses as in the Piping Spec Calculator
Component data for building catalogs
The following data is required for each component in the CAD catalog. The long description is output in the bill of materials and order text and must therefore be suitable for ordering.
| Component | Required data | Additional | Optional |
|---|---|---|---|
| Pipe | Nominal size range from–to, pressure rating, wall thickness, long description, dimensions according to standard | Fixed pipe length yes/no | Material, weight per meter |
| Elbow | Bend radius (2D, 3D, 5D), angle | Material | |
| Reducer | DN 1 / DN 2, concentric or eccentric | Material | |
| Tee | equal or reduced branch | Material | |
| Weld neck flange | Flange type, facing | Material | |
| Lap joint flange | Flange type, facing, flare/collar | Material | |
| Valve | Type, end type/facing, face-to-face length, actuator | Material |
Valves
Valves shut off, control or protect the flow. Depending on the design, the closing element is a valve disc, a flap, a gate or a plug or ball.
Shut-off and control valves
- Globe valve, control valve, needle valve
- Butterfly valve, gate valve
- Ball valve, plug valve
- Swing check valve, check valve, backflow preventer
- Pressure reducer, steam trap, vent
- Mixing valve, balancing valve
- Safety valve
Other inline components
- Filter, strainer, dirt trap
- Compensator
- Orifice plate
- Sight glass
- Spade, spectacle blind
Actuators
Handwheel or lever, electric, pneumatic or hydraulic actuator. Check valves close automatically by the fluid flow.
Every valve has an application range defined by pressure, temperature, nominal size, tightness requirement, fluid and flow direction. Safety valves limit the pressure in boilers, vessels and reactors. Consider installation position and operability as early as the 3D design stage.
Overall concept · Piping construction
Software and training for this discipline
Which Autodesk software fits – and where you can learn it. Overview of all disciplines in the overall concept, all dates in the training calendar.
Software
Training dates
Pipe sizing and pressure drop
Nominal size from the flow rate and pressure drop of the line with fittings and valves – free in the Infobase.
Also available as a separate page: Pipe sizing & pressure drop
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Pipe identification DIN 2403
Pipe identification by flow medium – simulation for teaching (groups and colors according to Wikipedia "DIN 2403"), not for identification in operation.
Also available as a separate page: Plant identification
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Standards status for this page 8 standards · researched September 2026
| Standard | Contents | Current edition | Replaced / successor |
|---|---|---|---|
| DIN EN 13480 | Metallic industrial piping | DIN EN 13480-1 to -6 and -8:2024-12; Part 7 as DIN CEN/TR 13480-7:2022-08 | replaces the 2017-12 editions with amendments A1 ff. |
| DIN 21057 | Piping specs | DIN 21057-1:2023-08; Parts 5/6:2016-12; Parts 10–12:2026-04/-05 | replaces PAS 1057; DIN 21057-1:2016-12; DIN 21057-10 to -12:2017-04 |
| PAS 1057 | Piping specs | withdrawn | now: DIN 21057-1:2023-08 and subsequent parts |
| DIN EN 10220 | Seamless and welded steel tubes – General tables of dimensions and masses per unit length | DIN EN 10220:2003-03 | replaces DIN V ENV 10220:1994-02; DIN 2448:1981-02; DIN 2458:1981-02 |
| ASME B36.10 (until 2018: B36.10M) | Welded and Seamless Wrought Steel Pipe | ASME B36.10-2022 | replaces ASME B36.10M-2018 |
| ASME B36.19 (until 2018: B36.19M) | Welded and Seamless Wrought Stainless Steel Pipe | ASME B36.19-2022 | replaces ASME B36.19M-2018 |
| DIN EN 13480-3 | Metallic industrial piping – Part 3: Design and calculation | DIN EN 13480-3:2024-12 | replaces DIN EN 13480-3:2017-12; DIN EN 13480-3/A1:2021-05; DIN EN 13480-3/A2:2020-12 |
| DIN 2403 | Identification of pipelines according to fluid conveyed | DIN 2403:2025-12 | replaces DIN 2403:2018-10 |
Researched at DIN Media, ISO, IEC and ASME, as of September 2026. Before binding use, please check the current edition with the standards publisher. Overview of all standards: Plant Engineering Infobase · Standards status.