This reference brings together the key dimensional and weight information for 16 inch Schedule 40S pipe, also identified as DN400. Use it when reviewing piping layouts, preparing fabrication details, checking material takeoffs, or comparing information on drawings and purchase documents.
The table and listed values below are the page’s technical reference data. The explanatory notes clarify how each dimension is used and how the NPS, DN, schedule, and stainless steel designations relate to one another.
Schedule 40S Pipe 16 Inch (DN400) is a stainless steel pipe size commonly used in industrial piping systems that require corrosion resistance, dependable wall thickness, and reliable flow capacity. This pipe size is often used in process plants, utility systems, water treatment projects, and stainless steel fabrication work.
This dimension data is based on ANSI/ASME B36.19, which is the standard commonly used for stainless steel pipe dimensions.
16 Inch Schedule 40S Pipe Dimensions
- Pipe Schedule: 40S
- Nominal Pipe Size: 16 Inch
- DN Size: DN400
- Outside Diameter (OD): 406.4 mm
- Inside Diameter (ID): 387.34 mm
- Wall Thickness: 9.53 mm
- Pipe Weight: 93.27 kg/m
- Pipe Weight Including Water: 211.04 kg/m
- Standard: ANSI/ASME B36.19
Schedule 40S Pipe 16 Inch Dimension Table
| Pipe Schedule | NPS (Inch) | DN (mm) | OD (mm) | ID (mm) | Wall Thickness (mm) | Weight (kg/m) |
|---|---|---|---|---|---|---|
| 40S | 16 | 400 | 406.4 | 387.34 | 9.53 | 93.27 |
What Is 16 Inch Schedule 40S Pipe?
A 16 inch Schedule 40S pipe is a stainless steel pipe with a nominal size of 16 inches and a wall thickness defined by the 40S schedule. For this size, the outside diameter is fixed at 406.4 mm, while the inside diameter is 387.34 mm based on a wall thickness of 9.53 mm.
The letter S in 40S is commonly used for stainless steel pipe dimensions under ASME B36.19. This designation is widely used by engineers, fabricators, and procurement teams when selecting stainless steel piping for industrial service.
Where Is Schedule 40S Pipe 16 Inch Used?
This pipe size is commonly used in systems that need both good flow capacity and the corrosion resistance of stainless steel. Typical applications include:
- Process piping in industrial plants
- Water treatment and utility systems
- Food and beverage piping lines
- Chemical service piping
- Stainless steel header systems
Why Pipe Dimensions Matter
Accurate 16 inch Schedule 40S pipe dimensions are important for piping layout, fabrication, support design, transport planning, and material takeoff. Engineers and designers often check OD, ID, wall thickness, and weight before selecting flanges, fittings, supports, and installation methods.
The outside diameter is important for matching clamps, flanges, and pipe supports. The inside diameter helps estimate flow area and system capacity. The wall thickness is important for specification compliance and mechanical strength, while the pipe weight per meter is useful for structural loading, support design, and handling calculations.
16 Inch Schedule 40S Pipe Weight Information
The nominal weight of this pipe size is 93.27 kg/m. When filled with water, the combined weight becomes approximately 211.04 kg/m. This information is useful for lifting plans, support design, and pipe rack load calculations in industrial projects.
Difference Between NPS 16 and DN400
NPS 16 is the inch-based nominal pipe size, while DN400 is the metric designation used in international drawings and specifications. Both terms refer to the same nominal pipe size, and users may search by either inch or DN format depending on project standards.
Common Search Terms for This Pipe Size
Users may also search for this pipe using related keywords such as 16 inch Schedule 40S pipe dimensions, DN400 Schedule 40S pipe dimensions, 16 inch stainless steel pipe weight, DN400 pipe dimensions, or DN400 sch 40s pipe dimensions.
Conclusion
Schedule 40S Pipe 16 Inch (DN400) has an outside diameter of 406.4 mm, an inside diameter of 387.34 mm, a wall thickness of 9.53 mm, and a weight of 93.27 kg/m. It is a useful stainless steel pipe reference size for design, drafting, fabrication, and procurement work.
This page provides a quick reference for engineers, drafters, fabricators, and buyers who need reliable 16 inch Schedule 40S pipe dimensions and DN400 pipe dimensions in one place.
How to Read the 16 Inch Schedule 40S Pipe Data
The pipe schedule identifies the wall-thickness designation used with the nominal pipe size. It should be read together with the pipe material and the applicable dimensional standard rather than treated as a complete design specification by itself. Material grade, corrosion requirements, joining method, temperature, pressure, and code requirements still need to be confirmed for the project.
NPS 16 is the inch-based nominal size, while DN400 is the corresponding metric designation. These labels are useful when cross-checking equipment connections, piping specifications, CAD drawings, and procurement documents. The nominal size should not be confused with the measured outside or inside diameter.
Using OD, ID, and Wall Thickness in Design Work
The outside diameter is the primary dimensional reference for many external interfaces, including pipe supports, clamps, sleeves, and fitting connections. The inside diameter is more relevant to the available flow passage and internal clearance. Wall thickness connects these two dimensions and is important when checking fabrication details, corrosion allowances, inspection requirements, and specification compliance.
For drafting and layout work, verify which dimension a connected component uses before detailing the joint. For example, an external support detail and an internal flow calculation may require different pipe dimensions from the same reference entry.
Using Pipe Weight in Support and Handling Reviews
The listed pipe weight is useful for preliminary material takeoffs, lifting discussions, transport planning, and pipe-rack load reviews. The water-filled weight is a separate reference for situations in which the pipe contains water. Actual support reactions and structural loads may also depend on span, support arrangement, insulation, valves, fittings, testing conditions, and other attached contents.
Related Pipe Reference Topics
For a complete piping reference workflow, connect this page with related resources on pipe schedules, stainless steel pipe dimensions, pipe fittings, flange dimensions, and pipe support design. A CAD/DWG pipe reference can also help drafters transfer the dimensional information into layouts, while a pipe weight reference supports preliminary handling and load checks.
Frequently Asked Questions
What is the nominal size of Schedule 40S pipe in this reference?
The nominal size is NPS 16, with the corresponding metric designation DN400.
Is 16 inch Schedule 40S pipe stainless steel?
Yes. The 40S designation is used here for the stainless steel pipe dimension reference based on ANSI/ASME B36.19.
What is the difference between nominal size and outside diameter?
Nominal size is the identifying size designation used in piping documents. Outside diameter is the measured external dimension used for many connection, support, and layout checks. They are related, but they are not interchangeable terms.
Which dimensions should be checked before selecting a fitting?
Confirm the pipe schedule, nominal size, outside diameter, wall thickness, material requirements, and the fitting or connection specification. The relevant joining details should be verified against the project documents.
Can the listed pipe weight be used directly for structural design?
The listed weight is a useful reference for preliminary calculations, but final support and structural design should also account for the pipe contents, fittings, valves, insulation, support spacing, operating conditions, and applicable engineering requirements.
Is the water-filled weight the same as the empty pipe weight?
No. The water-filled figure includes the pipe and its water contents, so it is greater than the listed pipe-only weight.