This reference page is intended for engineers, piping designers, CAD technicians, estimators, and fabricators who need a quick dimensional check for NPS 16 Schedule 20 pipe. It brings together the inch-based and metric designations, dimensional values, and weight information used during layout, drafting, material takeoff, and coordination.
Use the dimensional data with the project’s piping specifications, material requirements, design conditions, and applicable fabrication documents. The values on this page describe the listed pipe reference; they do not replace project-specific engineering review or procurement verification.
Schedule 20 pipe 16 inch (DN400) is a standard steel pipe size commonly used in piping design, drafting, fabrication, estimation, and industrial layout work. This page provides the standard dimensions, wall thickness, inside diameter, and weight per meter for NPS 16 Schedule 20 pipe based on ASME B36.10.
For engineers, designers, estimators, and CAD users, quick access to accurate pipe data helps improve piping layout, support planning, weight checks, material takeoff, and fabrication coordination during project development.
16 Inch Schedule 20 Pipe Dimensions
- Nominal Pipe Size (NPS): 16 inch
- Diameter Nominal (DN): DN400
- Outside Diameter (OD): 406.4 mm
- Wall Thickness: 7.92 mm
- Inside Diameter (ID): 390.56 mm
- Pipe Weight: 77.83 kg/m
- Pipe Weight Including Water: 197.57 kg/m
- Standard: ASME B36.10
Schedule 20 Pipe 16 Inch Data Table
| NPS | DN | Outside Diameter (OD) | Wall Thickness | Inside Diameter (ID) | Weight |
|---|---|---|---|---|---|
| 16 inch | DN400 | 406.4 mm | 7.92 mm | 390.56 mm | 77.83 kg/m |
Understanding 16 Inch Schedule 20 Pipe
16 inch Schedule 20 pipe is a standard steel pipe size used as a reference in industrial piping layouts, water lines, utility systems, process design studies, and CAD drafting. With an outside diameter of 406.4 mm and a wall thickness of 7.92 mm, this pipe size is useful where a large flow path is needed while keeping the wall lighter than heavier schedules.
What Does Schedule 20 Mean?
Schedule 20 refers to the wall thickness series of the pipe. For NPS 16, Schedule 20 gives a wall thickness of 7.92 mm. The schedule affects the inside diameter, pipe weight, fabrication requirements, and dimensional coordination with fittings, supports, and layout clearances.
Why These Pipe Dimensions Matter
Accurate pipe dimension data is important for piping layouts, spool drawings, support design, structural load review, and material takeoff. Knowing that this pipe weighs 77.83 kg/m helps with transport estimates, lifting plans, and support loading. If the pipe is filled with water, the total weight increases to 197.57 kg/m, which is also useful for operating load calculations.
Common Uses of DN400 Schedule 20 Pipe
DN400 Schedule 20 pipe may be referenced in industrial utility systems, water transfer lines, plant layout studies, process piping documentation, and engineering design work. It is also commonly used by piping designers, CAD users, estimators, and procurement teams who need fast access to standard steel pipe dimensions.
Difference Between NPS 16 and DN400
NPS 16 is the inch-based nominal pipe size designation, while DN400 is the metric nominal diameter reference. Both refer to the same pipe size category on this page. The actual standard outside diameter for this size is 406.4 mm. :contentReference[oaicite:2]{index=2}
How to Use This Data
You can use this page to quickly check:
- pipe outside diameter for layout and clearance
- inside diameter for flow reference
- wall thickness for schedule comparison
- weight per meter for estimation and transport planning
- water-filled weight for support and structural load review
Quick Reference for Schedule 20 Pipe 16 Inch
- Pipe Size: 16 inch
- DN: DN400
- OD: 406.4 mm
- ID: 390.56 mm
- Wall Thickness: 7.92 mm
- Weight: 77.83 kg/m
- Weight Including Water: 197.57 kg/m
- Reference Standard: ASME B36.10
Related Pipe Size Pages
Conclusion
Schedule 20 Pipe 16 Inch (DN400) is an important steel pipe reference for piping design, drafting, estimation, and fabrication work. With its 406.4 mm outside diameter, 7.92 mm wall thickness, and 77.83 kg/m pipe weight, it provides useful dimensional data for engineers and designers who need fast and accurate pipe information.
Note: NPS = Nominal Pipe Size, DN = Diameter Nominal. Dimensions and weights shown here are based on ASME B36.10 steel pipe data.
How to Read This Pipe Reference
The most important distinction is between the nominal designation and the measured dimensions. NPS 16 and DN400 identify the same pipe size category on this page, while the listed outside diameter is 406.4 mm. Use the outside diameter when checking physical clearance, support interfaces, insulation space, sleeves, and CAD geometry.
The listed 390.56 mm inside diameter is useful for preliminary flow-area and internal-clearance reference. Final hydraulic calculations should also account for the project fluid, operating conditions, internal surface condition, fittings, valves, and the applicable design method.
Schedule, Thickness, and Weight
In this reference, Schedule 20 identifies the applicable wall-thickness series for NPS 16, with a listed wall thickness of 7.92 mm. The schedule designation should not be treated as a complete pressure-design qualification by itself. Pressure capability and service suitability require review of the material, design code, temperature, corrosion or erosion allowance, manufacturing requirements, and project specifications.
The listed pipe weight is 77.83 kg/m. The page also provides a water-filled value of 197.57 kg/m. These figures can support preliminary quantity, transport, lifting, and support-load checks, but the complete installed load may also include contents, insulation, valves, flanges, supports, and other attached components.
Practical CAD and Design Checks
- Use the outside diameter for the primary pipe envelope and clearance review.
- Use the wall thickness when comparing schedule references and coordinating fabrication details.
- Use the inside diameter as a dimensional input for preliminary internal-flow or clearance work.
- Use the mass-per-length values for early estimation and support-load coordination.
- Confirm end preparation, length, material grade, tolerances, and component compatibility from the project documents before release for fabrication or purchase.
Related Reference Opportunities
For size comparison, link this page with the related Schedule 20 Pipe 14 Inch (DN350) and Schedule 20 Pipe 18 Inch (DN450) references. A broader internal guide to pipe schedules, dimensions, and fittings can help readers move from a single-size lookup to coordinated piping design research.
Frequently Asked Questions
What is the outside diameter of 16 inch Schedule 20 pipe?
The listed outside diameter is 406.4 mm. This is the key dimensional value for layout, clearance, and CAD envelope checks.
What is the wall thickness of NPS 16 Schedule 20 pipe?
The listed wall thickness is 7.92 mm. The schedule identifies the wall-thickness series for this nominal pipe size.
What is the inside diameter of DN400 Schedule 20 pipe?
The listed inside diameter is 390.56 mm. Treat it as a reference dimension and verify the applicable manufacturing and project requirements for detailed calculations.
How much does 16 inch Schedule 20 pipe weigh?
The listed pipe weight is 77.83 kg/m. The listed water-filled weight is 197.57 kg/m; additional installed components and design allowances may increase the total load.
Are NPS 16 and DN400 the same pipe size reference?
On this page, NPS 16 is the inch-based designation and DN400 is the metric designation for the same pipe size category. The actual outside diameter is listed separately as 406.4 mm.