Use this reference when you need a clear dimensional check for 16 inch Schedule 160 pipe, also identified as NPS 16 and DN400. The page brings together the listed outside diameter, wall thickness, inside diameter, and pipe weight so designers, estimators, fabricators, and drafters can verify the section before using it in drawings or calculations.
Because nominal pipe size is a designation rather than a direct measurement, confirm the outside diameter and wall thickness from the table when coordinating this pipe with flanges, fittings, supports, or connection details.
Schedule 160 pipe 16 inch (DN400) is an extra heavy-wall steel pipe size commonly used in piping design, fabrication, drafting, and engineering estimation work. This page provides the standard dimensions, wall thickness, inside diameter, and weight per meter for NPS 16 Schedule 160 pipe based on ASME B36.10.
16 Inch Schedule 160 Pipe Dimensions
- Nominal Pipe Size (NPS): 16 inch
- Diameter Nominal (DN): DN400
- Outside Diameter (OD): 406.4 mm
- Wall Thickness: 40.49 mm
- Inside Diameter (ID): 325.42 mm
- Pipe Weight: 365.38 kg/m
- Pipe Weight Filled With Water: 448.51 kg/m
- Reference Standard: ASME B36.10
- Pipe Type: Steel Pipe
Schedule 160 Pipe 16 Inch Data Table
| Pipe Size | DN | OD (mm) | Wall Thickness (mm) | ID (mm) | Weight (kg/m) |
|---|---|---|---|---|---|
| 16 inch | 400 | 406.4 | 40.49 | 325.42 | 365.38 |
What Does Schedule 160 Mean?
Schedule 160 refers to an extra heavy wall thickness series used for steel pipe under ASME B36.10. For the same nominal pipe size, the outside diameter remains fixed while the wall thickness increases according to the schedule. A much thicker wall reduces the inside diameter and significantly increases pipe weight.
Typical Uses of 16 Inch Schedule 160 Pipe
NPS 16 Schedule 160 pipe is commonly referenced for very heavy-duty industrial piping systems where extremely high wall thickness is required. It may be used in process piping, plant utility systems, structural loading checks, fabrication work, and engineering applications where pipe strength and wall thickness are more critical than maximum flow area.
Why Pipe Weight Matters
Pipe weight per meter is essential for transport planning, crane lifting studies, support design, structural loading, fabrication estimates, and installation planning. For a 16 inch Schedule 160 pipe, the extra heavy wall thickness results in much higher installed weight than lighter schedules, so accurate weight data is important for engineering and construction work.
16 Inch Schedule 160 Pipe Calculation Notes
The listed weight is based on standard steel pipe dimensions using the outside diameter and wall thickness of the pipe. Actual product weight may vary slightly depending on manufacturing tolerance, material specification, and supplier standard.
Frequently Asked Questions
What is the outside diameter of 16 inch Schedule 160 pipe?
The outside diameter is 406.4 mm.
What is the wall thickness of DN400 Schedule 160 pipe?
The wall thickness is 40.49 mm.
What is the inside diameter of NPS 16 Schedule 160 pipe?
The inside diameter is 325.42 mm.
How much does 16 inch Schedule 160 pipe weigh?
The approximate weight is 365.38 kg/m.
Which standard covers this pipe size?
This dimension data is based on ASME B36.10 for steel pipe.
Conclusion
Schedule 160 pipe 16 inch (DN400) has an outside diameter of 406.4 mm, wall thickness of 40.49 mm, inside diameter of 325.42 mm, and a weight of 365.38 kg/m. It is a useful reference for piping design, fabrication, estimating, and heavy-duty industrial engineering work.
How to Read the 16 Inch Schedule 160 Data
The most useful checks are the relationship between outside diameter, wall thickness, and inside diameter. The outside diameter is the primary dimensional envelope for layout and external interfaces. Wall thickness defines the heavy-wall construction, while the inside diameter indicates the available flow passage after the wall is accounted for.
For drafting and model coordination, use the listed outside diameter when checking clearances, clamps, supports, and connection alignment. Use the listed inside diameter when reviewing flow-area assumptions or coordinating internal access. The reported weight is important for support reactions, lifting plans, transportation, and material estimates; the water-filled value should be treated as a separate operating-load reference rather than as the dry pipe weight.
Schedule 160, Pressure Design, and Specification Checks
A schedule identifies a standardized wall-thickness series for a nominal pipe size. It does not, by itself, establish an allowable pressure or confirm that a pipe is suitable for a particular service. Pressure design also depends on factors such as material specification, temperature, corrosion allowance, joining method, design code, and fabrication requirements.
Before issuing a drawing or purchase request, compare this dimensional reference with the project piping specification and the applicable component standards. Pay particular attention to mating flanges, butt-weld fittings, valve end dimensions, pipe supports, and any CAD or DWG model used for coordination.
Practical Coordination Notes
- Use NPS and DN as identification fields, but use the listed measured dimensions for layout decisions.
- Check whether connected components use compatible nominal size, outside diameter, wall thickness, and facing details.
- Include the dry pipe weight in support and handling studies, and evaluate contained fluid separately when applicable.
- Confirm material, manufacturing tolerance, end preparation, and project requirements before treating the data as a procurement specification.
Additional Questions About 16 Inch Schedule 160 Pipe
Are NPS 16 and DN400 the same measured diameter?
They are corresponding nominal designations for this pipe size, but neither designation should be treated as the actual outside or inside diameter. Use the dimensional values listed in the reference table for engineering and drafting checks.
Does Schedule 160 alone define the pipe pressure rating?
No. Schedule describes the wall-thickness series. A pressure rating or allowable service condition requires the applicable material, design code, temperature, manufacturing, and project-specific requirements.
Why is the inside diameter important?
The inside diameter helps identify the available flow passage and supports coordination of flow calculations, internal clearances, and connected piping components. It is smaller than the outside diameter because the wall occupies the difference between them.
Should the listed pipe weight be used for support design?
It is a useful reference for preliminary loading, handling, and estimating work. Final support design should also account for the project material specification, actual supplied product, fittings, valves, insulation, contents, and other applicable loads.
What should be checked before using a DWG reference?
Verify that the drawing reflects the required nominal size, schedule, dimensions, end conditions, and project revision. Coordinate the model with the current piping specification and the dimensions of connected components.