This reference provides the dimensional and weight data needed to identify Schedule 80 pipe 16 inch (DN400) for piping layouts, fabrication planning, procurement review, and engineering documentation. Use the table together with the surrounding explanations to distinguish nominal size from the physical dimensions used for fit-up and support planning.
For related design work, this page can be reviewed alongside references covering pipe schedules, nominal pipe size and DN terminology, flange dimensions, pipe supports, and CAD/DWG piping details. Those subjects help connect the listed pipe dimensions to the wider piping system.
Schedule 80 Pipe 16 Inch (DN400) is a heavy wall steel pipe commonly used in industrial piping systems that require higher strength and thicker pipe walls than lighter schedules. This pipe size is based on ANSI/ASME B36.10 and is widely referenced in process piping, utility systems, water treatment plants, and mechanical applications. For this size, the standard data shows an outside diameter of 406.4 mm, an inside diameter of 363.52 mm, a wall thickness of 21.44 mm, and a pipe weight of 203.54 kg/m.
Schedule 80 Pipe 16 Inch (DN400) Dimensions
- Pipe Standard: ANSI/ASME B36.10
- Nominal Pipe Size: 16 inch
- DN Size: DN400
- Outside Diameter (OD): 406.4 mm
- Inside Diameter (ID): 363.52 mm
- Wall Thickness: 21.44 mm
- Pipe Weight: 203.54 kg/m
- Pipe Weight Including Water: 307.27 kg/m
What Is Schedule 80 Pipe?
Schedule 80 refers to a pipe wall thickness classification. For the same nominal pipe size, a Schedule 80 pipe has a thicker wall and a smaller inside diameter than lower schedule pipes. This makes it a practical choice for systems that need additional pipe strength, durability, and long-term service performance.
Why 16 Inch DN400 Pipe Dimensions Matter
Knowing the exact dimensions of a 16 inch Schedule 80 pipe is important for piping design, fabrication, and installation. The outside diameter helps with flange matching, clamps, and supports. The inside diameter affects flow area and system capacity. The wall thickness is important for strength and service conditions, while the pipe weight per meter is useful for transport, lifting plans, and structural support calculations.
Common Uses of Schedule 80 Pipe 16 Inch (DN400)
This pipe size is often used in larger industrial and commercial systems such as:
- Water treatment and utility piping
- Process and plant piping systems
- Oil and gas applications
- Pump stations and mechanical services
- Heavy-duty industrial pipe networks
16 Inch Schedule 80 Pipe Data Table
| NPS | DN | OD (mm) | ID (mm) | Wall Thickness (mm) | Weight (kg/m) |
|---|---|---|---|---|---|
| 16 inch | 400 | 406.4 | 363.52 | 21.44 | 203.54 |
Additional Information for Engineers and Buyers
Before selecting this pipe size, it is also important to review the material grade, end type, design pressure, corrosion allowance, operating temperature, and project code requirements. While Schedule 80 defines the dimensional wall category, the final pipe selection should always match the actual service condition and engineering specification.
Note: NPS means nominal pipe size in inches, while DN means diameter nominal in millimeters. These are standard reference sizes used for pipe identification.
How to Use This 16 Inch Schedule 80 Pipe Reference
The listed outside diameter is the primary interface dimension for components that fit around the pipe, including flanges, clamps, supports, and other connection hardware. The inside diameter describes the available bore and should be considered when reviewing flow paths, equipment connections, and system capacity.
Wall thickness identifies the dimensional wall category, but it does not by itself establish an acceptable design pressure or service life. Material grade, corrosion allowance, temperature, fluid service, joining method, and the governing project requirements must be checked separately. These factors are especially important when comparing procurement options that share the same nominal pipe size.
Dimensions, Weight, and Installation Planning
The pipe weight listed in the source data is useful for handling, shipping, lifting, and support coordination. The water-filled weight is a separate planning reference for systems where the pipe contains water during operation, testing, or maintenance. Engineers should confirm the applicable load cases and support spacing through the project design rather than treating the tabulated weights as a complete support design.
CAD and Drafting Coordination
The downloadable DWG reference can support drafting and layout coordination. Before using a drawing in a project model, verify the required units, connection details, flange standard, end preparation, material specification, and revision status. The nominal designation should also be checked against the actual outside diameter wherever clearance, support, or connection geometry is critical.
Selection Checks Before Purchase or Fabrication
- Confirm the nominal size and DN designation against the piping specification.
- Verify the required wall category and material grade.
- Review pressure, temperature, corrosion, and fluid-service requirements.
- Check end type, joining method, flange compatibility, and fitting interfaces.
- Use the listed weight information when coordinating logistics and structural support review.
- Confirm that the project code and procurement documents govern the final selection.
Frequently Asked Questions
What does Schedule 80 mean for this pipe?
Schedule 80 is a wall-thickness classification. For a given nominal pipe size, it identifies a thicker wall category and a correspondingly smaller inside diameter than lighter schedule classifications.
Are NPS and DN the same measurement?
No. NPS is the nominal pipe size designation expressed in inches, while DN is the nominal diameter designation used in millimeters. They are identification systems and should not be treated as direct measurements of the outside or inside diameter.
Which dimension is used for flange and support coordination?
The outside diameter is generally the key dimensional reference for components that connect to or surround the pipe. The applicable flange, support, clamp, and fabrication details must still be checked against the project specification.
Does Schedule 80 alone determine pressure suitability?
No. Final suitability also depends on material grade, design pressure, operating temperature, corrosion allowance, service conditions, and the governing engineering code or project specification.
Why is pipe weight including water shown separately?
The separate water-filled weight helps with operational, testing, lifting, and support-load discussions when the pipe contains water. The relevant load case should be confirmed for the specific installation.