This reference brings the key 8 inch Schedule 40S pipe dimensions together for engineers, drafters, fabricators, and procurement teams. Use the data below to compare the nominal size with the actual outside diameter, inside diameter, wall thickness, and unit weight before coordinating connected piping components.
For practical design work, treat the table as a dimensional reference rather than a complete piping specification. Material grade, corrosion requirements, joining method, pressure-temperature service, and project specifications should be checked separately before procurement or fabrication.
Schedule 40S Pipe 8 Inch (DN200) 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.
8 Inch Schedule 40S Pipe Dimensions
- Pipe Schedule: 40S
- Nominal Pipe Size: 8 Inch
- DN Size: DN200
- Outside Diameter (OD): 219.1 mm
- Inside Diameter (ID): 202.74 mm
- Wall Thickness: 8.18 mm
- Pipe Weight: 42.55 kg/m
- Pipe Weight Including Water: 74.81 kg/m
- Standard: ANSI/ASME B36.19
Schedule 40S Pipe 8 Inch Dimension Table
| Pipe Schedule | NPS (Inch) | DN (mm) | OD (mm) | ID (mm) | Wall Thickness (mm) | Weight (kg/m) |
|---|---|---|---|---|---|---|
| 40S | 8 | 200 | 219.1 | 202.74 | 8.18 | 42.55 |
What Is 8 Inch Schedule 40S Pipe?
A 8 inch Schedule 40S pipe is a stainless steel pipe with a nominal size of 8 inches and a wall thickness defined by the 40S schedule. For this size, the outside diameter is fixed at 219.1 mm, while the inside diameter is 202.74 mm based on a wall thickness of 8.18 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 8 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 8 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.
8 Inch Schedule 40S Pipe Weight Information
The nominal weight of this pipe size is 42.55 kg/m. When filled with water, the combined weight becomes approximately 74.81 kg/m. This information is useful for lifting plans, support design, and pipe rack load calculations in industrial projects.
Difference Between NPS 8 and DN200
NPS 8 is the inch-based nominal pipe size, while DN200 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 8 inch Schedule 40S pipe dimensions, DN200 Schedule 40S pipe dimensions, 8 inch stainless steel pipe weight, DN200 pipe dimensions, or DN200 sch 40s pipe dimensions.
Conclusion
Schedule 40S Pipe 8 Inch (DN200) has an outside diameter of 219.1 mm, an inside diameter of 202.74 mm, a wall thickness of 8.18 mm, and a weight of 42.55 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 8 inch Schedule 40S pipe dimensions and DN200 pipe dimensions in one place.
How to Use This Schedule 40S Pipe Reference
The nominal size identifies the pipe within common inch-based and metric designation systems, but it should not be confused with the measured outside or inside diameter. The listed outside diameter is especially useful when checking dimensional compatibility with fittings, flanges, clamps, supports, and layout clearances.
The inside diameter and wall thickness serve different purposes. Inside diameter supports flow-area and hydraulic checks, while wall thickness is used when reviewing dimensional compliance, fabrication details, corrosion allowances, and mechanical requirements established by the project specification. These values should be coordinated with the applicable material and design requirements rather than treated as a standalone pressure rating.
The listed pipe weight can support preliminary material takeoffs, handling reviews, and support-load studies. A complete piping load review may also need to consider contents, valves, fittings, insulation, attachments, test conditions, and support spacing. The water-filled weight is useful as a reference for a filled-line condition, but the governing project load case should be confirmed by the responsible engineer.
Related Pipe References to Review
Readers comparing this size may also benefit from related references covering pipe schedules, NPS and DN terminology, stainless steel pipe, pipe flanges, pipe fittings, and pipe support loads. Linking those topics here can help users move from dimensional lookup to layout, connection, and installation decisions without confusing nominal size with component compatibility.
Frequently Asked Questions
What does 40S mean in this pipe designation?
40S identifies the stainless steel schedule designation used for this pipe dimension reference. The designation should be read together with the nominal size and the applicable dimensional standard.
Are NPS 8 and DN200 the same nominal pipe size?
Yes. NPS 8 is the inch-based designation and DN200 is the metric designation used for the same nominal pipe size. The two labels may appear together on drawings, specifications, and procurement documents.
Which dimension should be checked when selecting a flange or fitting?
Check the component standard, nominal size, connection type, and the pipe outside diameter. The pipe wall thickness may also affect certain connection details, so the fitting or flange specification should be reviewed rather than selected from nominal size alone.
Can the listed pipe weight be used for pipe support design?
It can be used as a dimensional reference and preliminary load input. Final support design should also account for the applicable contents, fittings, valves, insulation, attachments, operating conditions, and project design requirements.
Is the water-filled weight a complete piping load?
No. It represents the listed pipe and water condition only. The complete design load may include additional components and load cases that must be evaluated for the specific piping system.