This reference is intended for engineers, designers, fabricators, estimators, and drafters who need to identify 16 inch Schedule 140 pipe by both its U.S. nominal size and DN designation. Use the table below when checking dimensional relationships, preparing piping layouts, reviewing material takeoffs, or selecting a drawing reference.
For related work, connect this page with the site’s pipe schedule reference, NPS and DN terminology guide, steel pipe weight resources, and pipe fitting and flange dimensions. Those references help place this single pipe size in the wider piping-design context without replacing the authoritative values shown on this page.
Schedule 140 pipe 16 inch (DN400) is a 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 140 pipe based on ASME B36.10.
16 Inch Schedule 140 Pipe Dimensions
- Nominal Pipe Size (NPS): 16 inch
- Diameter Nominal (DN): DN400
- Outside Diameter (OD): 406.4 mm
- Wall Thickness: 36.53 mm
- Inside Diameter (ID): 333.34 mm
- Pipe Weight: 333.21 kg/m
- Pipe Weight Filled With Water: 420.43 kg/m
- Reference Standard: ASME B36.10
- Pipe Type: Steel Pipe
Schedule 140 Pipe 16 Inch Data Table
| Pipe Size | DN | OD (mm) | Wall Thickness (mm) | ID (mm) | Weight (kg/m) |
|---|---|---|---|---|---|
| 16 inch | 400 | 406.4 | 36.53 | 333.34 | 333.21 |
What Does Schedule 140 Mean?
Schedule 140 refers to a very 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 thicker wall reduces the inside diameter and significantly increases pipe weight.
Typical Uses of 16 Inch Schedule 140 Pipe
NPS 16 Schedule 140 pipe is commonly referenced for heavy-duty industrial piping systems where very 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 140 pipe, the 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 140 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 140 pipe?
The outside diameter is 406.4 mm.
What is the wall thickness of DN400 Schedule 140 pipe?
The wall thickness is 36.53 mm.
What is the inside diameter of NPS 16 Schedule 140 pipe?
The inside diameter is 333.34 mm.
How much does 16 inch Schedule 140 pipe weigh?
The approximate weight is 333.21 kg/m.
Which standard covers this pipe size?
This dimension data is based on ASME B36.10 for steel pipe.
Conclusion
Schedule 140 pipe 16 inch (DN400) has an outside diameter of 406.4 mm, wall thickness of 36.53 mm, inside diameter of 333.34 mm, and a weight of 333.21 kg/m. It is a useful reference for piping design, fabrication, estimating, and heavy-duty industrial engineering work.
How to Read This Pipe Reference
The page identifies one steel pipe size using several complementary descriptions: NPS expresses the nominal inch designation, DN provides the metric designation, and OD identifies the fixed outside envelope used for layout and connection coordination. Wall thickness then determines the available internal bore and contributes substantially to the pipe’s mass.
When checking a drawing or material takeoff, compare all of these fields rather than relying on the nominal size alone. A schedule is not an independent outside-diameter series; for a given nominal pipe size, it describes a wall-thickness selection. This is why changing the schedule affects inside diameter and weight while the listed outside diameter remains associated with the nominal size.
Design and Drafting Checks
- Use the outside diameter when coordinating pipe supports, clamps, clearances, and connection locations.
- Use the inside diameter when reviewing flow-area assumptions or checking transitions to other components.
- Use the pipe weight for handling, support, lifting, transport, and structural-load discussions, while keeping fluid contents and attached components separate in the engineering assessment.
- Confirm the material specification, manufacturing tolerance, corrosion allowance, joining method, and project design basis before using the reference for procurement or final design.
- Use the supplied DWG resource as a drafting aid, then verify dimensions against the project specification and the applicable component standards.
Empty-Pipe and Water-Filled Weight
The reference distinguishes the pipe’s listed mass from the corresponding water-filled value. These quantities serve different planning purposes: the first supports pipe handling and fabrication estimates, while the second helps frame a loaded condition for support or lifting discussions. A complete engineering load check may also need insulation, lining, valves, fittings, supports, test media, and other contents considered separately.
Reference Use and Verification
ASME B36.10 provides the dimensional context identified in the source content. It does not by itself establish every requirement for a complete piping system, such as material grade, pressure design, corrosion allowance, fabrication qualification, or installation acceptance. Treat this page as a dimensional reference and verify project-specific requirements before issuing drawings, purchasing material, or approving a design.
Editorial FAQ
Why are both NPS and DN shown?
NPS and DN are different naming systems used to identify the same nominal pipe size in many U.S. and international engineering documents. Showing both helps users cross-reference specifications, drawings, catalogs, and equipment data.
Does Schedule 140 describe the pipe material grade?
No. The schedule identifies a wall-thickness designation for the nominal pipe size. Material grade, manufacturing requirements, testing, and product certification must be established separately by the applicable project and material specifications.
Can the listed pipe weight be used as the complete design load?
No. The listed pipe weight is a useful reference for the pipe itself, but a design load may also include contents, insulation, coatings, fittings, valves, supports, test media, and installation effects. The responsible engineer should define the governing load case.
Why should a DWG download be checked before use?
A CAD file can accelerate layout and drafting, but it should be checked against the page data, project units, connection requirements, and current design documents before it is used for fabrication or construction.