Free Engineering Tool — #149
Steel Pipe Dimensions — ISO 4200
Look up OD, wall thickness, ID, and weight per meter for standard steel pipe sizes. Select DN or NPS and schedule.
Pipe Data
| Schedule | OD (mm) | Wall (mm) | ID (mm) | Weight (kg/m) |
|---|
Pipe Weight Formula
- OD — outside diameter (mm)
- t — wall thickness (mm)
- ρ — steel density ≈ 7850 kg/m³
Schedule vs Pressure Class
Schedule number ≈ 1000 × P/S, where P is internal pressure (psi) and S is allowable stress (psi). Higher schedules handle higher pressures. Sch 40 is the most common for general service.
⚠️ Note: Always verify pipe dimensions from manufacturer data for critical applications. Tolerances per ISO 4200 and ASME B36.10 apply.
DN (Diamètre Nominal) is metric, NPS (Nominal Pipe Size) is imperial. They are not actual diameters but nominal identifiers. DN 50 = NPS 2 = 60.3 mm OD.
Schedule defines wall thickness for a given OD. Higher schedule = thicker wall = higher pressure capacity. Sch 40 is most common (identical to STD up to NPS 10). Sch 80 for higher pressures (identical to XS up to NPS 8).
Both define the same OD values. ISO 4200 is the international standard, ASME B36.10 is American. Wall thicknesses for common schedules are identical.
Weight (kg/m) = π × (OD − t) × t × 7850 / 1,000,000, with OD and t in mm. This is the standard formula for hollow cylindrical sections.
DN 100 (NPS 4) = 114.3 mm OD. This is the same worldwide regardless of schedule. Wall: Sch 10 = 3.05 mm, Sch 40 = 6.02 mm, Sch 80 = 8.56 mm.
The procedures described on this page were developed and field-tested by the Vibromera team using the Balanset-1A, a portable dual-channel balancer and vibration analyzer for on-site rotor balancing.
Professional field balancing instruments. Used in 50+ countries.
Nikolai Shelkovenko
Nikolai Shelkovenko is a vibration analysis engineer and the founder and CEO of Vibromera. For more than 15 years he has balanced rotating equipment in the field rather than on a test bench: mulchers, industrial fans, crushers, centrifuges, shafts and spindles. That work is what the Balanset instruments grew out of — they were designed as a tool a specialist can carry to the machine and use alone, on site, not as laboratory equipment. Vibromera was founded in 2017 and has been based in Porto, Portugal, since 2023. Development, assembly and support of the Balanset line all happen here. The flagship instrument is the Balanset-1A, a portable analyser for single- and two-plane balancing and for vibration diagnostics. Nikolai is personally involved in customer support, in working through difficult balancing cases and in the development of the software. He works with customers worldwide, in any language.
