Use this page as a quick reference when checking 14 inch Schedule 40S pipe dimensions for stainless steel piping layouts, material takeoffs, fabrication drawings, and procurement documents. The table brings the NPS, DN, outside diameter, inside diameter, wall thickness, and weight data together so the same size can be identified consistently across inch-based and metric project documentation.
For drafting and coordination work, compare this pipe reference with the relevant pipe schedule chart, stainless steel pipe dimensions, flange dimensions, and butt-weld fitting dimensions pages on PipeSTD. The downloadable DWG is also useful when a drawing requires a reusable representation of the DN350 pipe size.
Schedule 40S Pipe 14 Inch (DN350) 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.
14 Inch Schedule 40S Pipe Dimensions
- Pipe Schedule: 40S
- Nominal Pipe Size: 14 Inch
- DN Size: DN350
- Outside Diameter (OD): 355.6 mm
- Inside Diameter (ID): 336.54 mm
- Wall Thickness: 9.53 mm
- Pipe Weight: 81.33 kg/m
- Pipe Weight Including Water: 170.23 kg/m
- Standard: ANSI/ASME B36.19
Schedule 40S Pipe 14 Inch Dimension Table
| Pipe Schedule | NPS (Inch) | DN (mm) | OD (mm) | ID (mm) | Wall Thickness (mm) | Weight (kg/m) |
|---|---|---|---|---|---|---|
| 40S | 14 | 350 | 355.6 | 336.54 | 9.53 | 81.33 |
What Is 14 Inch Schedule 40S Pipe?
A 14 inch Schedule 40S pipe is a stainless steel pipe with a nominal size of 14 inches and a wall thickness defined by the 40S schedule. For this size, the outside diameter is fixed at 355.6 mm, while the inside diameter is 336.54 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 14 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 14 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.
14 Inch Schedule 40S Pipe Weight Information
The nominal weight of this pipe size is 81.33 kg/m. When filled with water, the combined weight becomes approximately 170.23 kg/m. This information is useful for lifting plans, support design, and pipe rack load calculations in industrial projects.
Difference Between NPS 14 and DN350
NPS 14 is the inch-based nominal pipe size, while DN350 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 14 inch Schedule 40S pipe dimensions, DN350 Schedule 40S pipe dimensions, 14 inch stainless steel pipe weight, DN350 pipe dimensions, or DN350 sch 40s pipe dimensions.
Conclusion
Schedule 40S Pipe 14 Inch (DN350) has an outside diameter of 355.6 mm, an inside diameter of 336.54 mm, a wall thickness of 9.53 mm, and a weight of 81.33 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 14 inch Schedule 40S pipe dimensions and DN350 pipe dimensions in one place.
How to Read This DN350 Pipe Reference
NPS 14 and DN350 are two naming systems for the same nominal pipe size. The nominal designation is used for identification; it should not be treated as a direct measurement of the pipe’s outside diameter. For physical coordination, use the listed OD, ID, and wall thickness rather than relying on the nominal name alone.
The outside diameter is the primary dimensional check for components that fit around the pipe, including supports, clamps, sleeves, and connected fittings. The inside diameter is more relevant to the available flow passage, while wall thickness helps distinguish the pipe configuration shown in the schedule reference. Always compare the pipe data with the applicable component drawing before fabrication.
Using the Weight Data in Design Work
The listed pipe weight can support preliminary material takeoffs, handling reviews, and pipe-support load checks. The water-filled figure is a reference for a pipe containing water; actual operating loads may differ when the service fluid, insulation, lining, valves, fittings, or other attachments are included. Final support and structural decisions should use the complete project load case and the responsible engineer’s verification.
Useful Related PipeSTD References
- Pipe schedule reference: compare schedule designations and locate related stainless steel pipe sizes.
- Pipe weight reference: review weight data when preparing takeoffs or preliminary support calculations.
- Flange and fitting dimensions: coordinate connection details with the pipe outside diameter and project specification.
- CAD and DWG resources: use the downloadable drawing for layout and drafting workflows, then verify project-specific details before release.
Before Ordering or Fabricating
Confirm the material grade, product specification, end preparation, length, surface condition, tolerances, and inspection requirements separately from the dimensional schedule. The dimensions on this page identify the referenced pipe size; they do not by themselves define every procurement or design requirement for a piping system.
Frequently Asked Questions
What are the key 14 inch Schedule 40S pipe dimensions?
The page lists the NPS, DN designation, outside diameter, inside diameter, wall thickness, pipe weight, and water-filled weight for this reference size. Use the dimension table as the primary quick-check section.
Is NPS 14 the same as DN350?
Yes. NPS 14 is the inch-based nominal designation, while DN350 is the metric designation used for the same nominal pipe size. The actual pipe dimensions are given separately in the table.
What does the “S” mean in Schedule 40S?
The “S” identifies the stainless steel pipe dimension designation associated with the referenced ASME B36.19 data. Confirm the complete material and purchasing specification before ordering.
Can the listed weight be used for pipe-support calculations?
It can serve as a dimensional reference or preliminary input, but final support calculations should also account for the service fluid, fittings, valves, insulation, attachments, operating conditions, and the project’s governing design requirements.
Is the water-filled weight the operating weight for every system?
No. It is a reference for the pipe when filled with water. A different service fluid or additional components will change the total operating load.
Is a DWG available for this pipe size?
Yes. The page includes a downloadable DWG reference for Schedule 40S Pipe 14 Inch (DN350). Review the drawing against the project specification before using it for fabrication or construction documents.