Use this page as a quick reference for Schedule 40S Pipe 4 Inch (DN100) when checking stainless steel piping dimensions for layouts, material takeoffs, fabrication, or procurement. The table below brings the nominal size, outside diameter, inside diameter, wall thickness, and unit weight together in one place.
For related design work, compare this reference with the site’s guides to pipe schedules, NPS and DN sizing, stainless steel pipe fittings, and pipe flange dimensions. Those references help connect the dimensional data to common drafting and piping-component decisions.
Schedule 40S Pipe 4 Inch (DN100) 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.
4 Inch Schedule 40S Pipe Dimensions
- Pipe Schedule: 40S
- Nominal Pipe Size: 4 Inch
- DN Size: DN100
- Outside Diameter (OD): 114.3 mm
- Inside Diameter (ID): 102.26 mm
- Wall Thickness: 6.02 mm
- Pipe Weight: 16.08 kg/m
- Pipe Weight Including Water: 24.28 kg/m
- Standard: ANSI/ASME B36.19
Schedule 40S Pipe 4 Inch Dimension Table
| Pipe Schedule | NPS (Inch) | DN (mm) | OD (mm) | ID (mm) | Wall Thickness (mm) | Weight (kg/m) |
|---|---|---|---|---|---|---|
| 40S | 4 | 100 | 114.3 | 102.26 | 6.02 | 16.08 |
What Is 4 Inch Schedule 40S Pipe?
A 4 inch Schedule 40S pipe is a stainless steel pipe with a nominal size of 4 inches and a wall thickness defined by the 40S schedule. For this size, the outside diameter is fixed at 114.3 mm, while the inside diameter is 102.26 mm based on a wall thickness of 6.02 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 4 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 4 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.
4 Inch Schedule 40S Pipe Weight Information
The nominal weight of this pipe size is 16.08 kg/m. When filled with water, the combined weight becomes approximately 24.28 kg/m. This information is useful for lifting plans, support design, and pipe rack load calculations in industrial projects.
Difference Between NPS 4 and DN100
NPS 4 is the inch-based nominal pipe size, while DN100 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 4 inch Schedule 40S pipe dimensions, DN100 Schedule 40S pipe dimensions, 4 inch stainless steel pipe weight, DN100 pipe dimensions, or DN100 sch 40s pipe dimensions.
Conclusion
Schedule 40S Pipe 4 Inch (DN100) has an outside diameter of 114.3 mm, an inside diameter of 102.26 mm, a wall thickness of 6.02 mm, and a weight of 16.08 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 4 inch Schedule 40S pipe dimensions and DN100 pipe dimensions in one place.
How to Use This Pipe Reference
Start with the nominal designation when identifying the pipe on drawings or in a bill of materials. Use the outside diameter when checking physical clearances, clamps, supports, flanges, and fitting interfaces. The inside diameter is the more relevant reference for flow-area estimates, while wall thickness helps confirm the selected schedule and supports fabrication review.
The listed pipe weight is useful for preliminary material takeoffs, handling discussions, and support-load calculations. For a line that contains water, the water-filled value provides a separate combined-load reference. Final support spacing, stress checks, pressure suitability, corrosion allowance, joining method, and material grade still require review against the project specification and the responsible engineer’s design basis.
Drafting and Procurement Checks
- Show both the NPS and DN designation when drawings may be read by teams using inch-based and metric terminology.
- Check the listed outside diameter before selecting clamps, supports, flanges, or connected fittings.
- Use the wall thickness and schedule designation consistently in material descriptions and purchase documents.
- Confirm the required stainless steel material grade, end preparation, length, surface condition, and applicable project requirements separately from the dimensional standard.
- Use the linked DWG resource for drafting reference, then verify the drawing against the project’s approved component and fabrication requirements.
Related internal references: Link this page to the site’s pipe schedule chart, stainless steel pipe dimensions, pipe weight calculator, flange dimension reference, and pipe support design guide where those resources are available.
Frequently Asked Questions
What does 40S mean for this pipe?
40S is the stainless steel schedule designation used with the dimensional reference identified on this page. It distinguishes the stainless steel pipe schedule from nominal size designations such as NPS 4 and DN100.
Are NPS 4 and DN100 the same nominal pipe size?
Yes. NPS 4 is the inch-based designation and DN100 is the metric designation used for the same nominal pipe size. They are nominal identifiers, not direct measurements of the pipe’s outside or inside diameter.
Which dimension should I use for pipe supports?
Use the outside diameter when checking the physical fit of clamps, supports, guides, and similar components. Also account for the pipe’s listed weight and any contents when evaluating support loads.
Can the listed weight be used as a final structural load?
It can support preliminary planning, but final structural and support calculations should consider the project’s design conditions, support arrangement, contents, insulation, valves, fittings, and applicable engineering requirements.
Is the DWG file ready for fabrication?
The DWG is provided as a drafting reference. Confirm units, drawing scale, connection details, tolerances, material requirements, and project approval status before using any drawing for fabrication or construction.