This reference brings together the key dimensions, weight information, terminology, and drafting resources for 1 1/2 inch Schedule 40S pipe, also identified as DN40. Use the table below when checking piping layouts, fabrication details, material takeoffs, or procurement descriptions.
When comparing this size with other stainless steel pipe options, review the nominal size and schedule together rather than relying on the inch designation alone. Outside diameter affects connection and support coordination, while inside diameter and wall thickness affect calculations and specification checks.
Schedule 40S Pipe 1 1/2 Inch (DN40) 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.
1 1/2 Inch Schedule 40S Pipe Dimensions
- Pipe Schedule: 40S
- Nominal Pipe Size: 1 1/2 Inch
- DN Size: DN40
- Outside Diameter (OD): 48.3 mm
- Inside Diameter (ID): 40.94 mm
- Wall Thickness: 3.68 mm
- Pipe Weight: 4.05 kg/m
- Pipe Weight Including Water: 5.36 kg/m
- Standard: ANSI/ASME B36.19
Schedule 40S Pipe 1 1/2 Inch Dimension Table
| Pipe Schedule | NPS (Inch) | DN (mm) | OD (mm) | ID (mm) | Wall Thickness (mm) | Weight (kg/m) |
|---|---|---|---|---|---|---|
| 40S | 1 1/2 | 40 | 48.3 | 40.94 | 3.68 | 4.05 |
What Is 1 1/2 Inch Schedule 40S Pipe?
A 1 1/2 inch Schedule 40S pipe is a stainless steel pipe with a nominal size of 1 1/2 inches and a wall thickness defined by the 40S schedule. For this size, the outside diameter is fixed at 48.3 mm, while the inside diameter is 40.94 mm based on a wall thickness of 3.68 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 1 1/2 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 branch and service lines
Why Pipe Dimensions Matter
Accurate 1 1/2 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.
1 1/2 Inch Schedule 40S Pipe Weight Information
The nominal weight of this pipe size is 4.05 kg/m. When filled with water, the combined weight becomes approximately 5.36 kg/m. This information is useful for lifting plans, support design, and pipe rack load calculations in industrial projects.
Difference Between NPS 1 1/2 and DN40
NPS 1 1/2 is the inch-based nominal pipe size, while DN40 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 1 1/2 inch Schedule 40S pipe dimensions, DN40 Schedule 40S pipe dimensions, 1 1/2 inch stainless steel pipe weight, DN40 pipe dimensions, or DN40 sch 40s pipe dimensions.
Conclusion
Schedule 40S Pipe 1 1/2 Inch (DN40) has an outside diameter of 48.3 mm, an inside diameter of 40.94 mm, a wall thickness of 3.68 mm, and a weight of 4.05 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 1 1/2 inch Schedule 40S pipe dimensions and DN40 pipe dimensions in one place.
How to Use This Pipe Reference
Start with the dimension table when preparing a drawing, checking a model, or reviewing a material list. Confirm the outside diameter for fittings, flanges, clamps, and supports. Use the listed inside diameter when a project calculation requires a flow-area input, and use the listed wall thickness when checking the specified pipe construction.
The published pipe weight is useful for preliminary handling, support, and pipe-rack load reviews. The water-filled weight is a separate reference for systems in service. Final design checks should also account for the project specification, insulation, valves, fittings, contents, support spacing, and applicable engineering requirements.
Coordination With Fittings, Flanges, and Drawings
Nominal pipe size terminology helps teams coordinate across specifications, procurement documents, and drawings. In this reference, NPS 1 1/2 and DN40 identify the same nominal size, but connected components still need to be checked for the correct standard, facing, material, pressure class, and dimensional compatibility.
For related design work, connect this page to the site’s stainless steel pipe dimensions, pipe schedule reference, pipe fittings dimensions, and pipe flange dimensions resources. Those references help readers compare adjacent sizes and coordinate the complete piping assembly without treating nominal size as a substitute for component verification.
CAD and Drafting Resource
The downloadable DWG provides a practical starting point for layout and drafting work involving this pipe size. Before issuing a drawing, verify the project’s units, layer conventions, material specification, joining method, and connection details. A CAD block or reference drawing should support engineering documentation, not replace a project-specific design review.
Frequently Asked Questions
What does 40S mean in this pipe reference?
40S is the stainless steel pipe schedule designation used with the dimensional reference identified on this page. The schedule should be read together with the nominal pipe size and applicable standard.
Are NPS 1 1/2 and DN40 the same pipe size?
Yes. In this reference, NPS 1 1/2 is the inch-based nominal designation and DN40 is the corresponding metric designation. The actual component dimensions should still be checked against the project specification and connection details.
Which dimensions are most important when selecting fittings?
The outside diameter is a primary coordination dimension for fittings, flanges, clamps, and supports. The schedule and wall thickness should also be verified because the connected component must match the specified pipe construction.
Can the listed pipe weight be used for support design?
The listed pipe weight is useful for preliminary load and handling reviews. Support design should also consider the operating contents, water-filled condition where applicable, insulation, attached components, support spacing, and project design requirements.
Is this page enough to select pipe for a process system?
No. This page is a dimensional and drafting reference. Final selection requires confirmation of material grade, corrosion requirements, pressure and temperature conditions, joining details, code requirements, and the project specification.