This reference provides the dimensional and weight data for 12 inch Schedule 80S stainless steel pipe, also identified as NPS 12 and DN300. Use the table for checking pipe geometry, material take-offs, layout coordination, and preliminary support or handling assessments.
For drafting and plant-design work, the dimensions should be coordinated with the applicable fittings, flanges, valves, supports, and pipe classes. The downloadable DWG can also help with CAD coordination, but project specifications and fabrication requirements remain the controlling documents.
Schedule 80S Pipe 12 Inch (DN300) is a stainless steel pipe size commonly used in industrial piping systems where corrosion resistance, dimensional consistency, and dependable wall thickness are important. Based on the current page data under ANSI/ASME B36.19, this pipe size has an outside diameter of 323.9 mm, an inside diameter of 298.5 mm, a wall thickness of 12.7 mm, and a pipe weight of 97.47 kg/m.
12 Inch Schedule 80S Pipe Dimensions
The following values are listed for NPS 12 Schedule 80S pipe, which corresponds to DN300 in metric designation.
- Pipe Size: NPS 12 Inch
- DN Size: DN300
- Outside Diameter (OD): 323.9 mm
- Inside Diameter (ID): 298.5 mm
- Wall Thickness: 12.7 mm
- Pipe Weight: 97.47 kg/m
- Pipe Weight Including Water: 167.41 kg/m
- Reference Standard: ANSI/ASME B36.19
Schedule 80S Pipe 12 Inch (DN300) Data Table
| Pipe Schedule | NPS | DN | OD (mm) | ID (mm) | Wall Thickness (mm) | Weight (kg/m) |
|---|---|---|---|---|---|---|
| 80S | 12 Inch | 300 | 323.9 | 298.5 | 12.7 | 97.47 |
What Is Schedule 80S Pipe?
Schedule 80S is a stainless steel pipe schedule designation commonly used under ASME B36.19. In piping design and fabrication, the schedule identifies the wall thickness series for a given nominal pipe size. This helps engineers, buyers, and fabricators confirm dimensional compatibility, estimate pipe weight, and coordinate with fittings, flanges, and supports.
Common Uses of 12 Inch Schedule 80S Pipe
12 inch Schedule 80S pipe is commonly used in stainless steel piping systems that require good corrosion resistance, dependable wall thickness, and strong flow capacity. This size is often selected for industrial projects where standard dimensions are needed for design, fabrication, procurement, and installation work.
- Process piping systems in chemical and industrial plants
- Water transmission lines for medium to large flow service
- Cooling water and utility piping in plant facilities
- Marine and offshore piping where stainless steel is preferred
- Food and beverage plants requiring corrosion-resistant piping materials
- Pharmaceutical facilities using stainless steel process lines
- Pump suction and discharge piping for larger piping systems
- Pipeline upgrade and replacement work where standard pipe dimensions are required
In practical engineering work, this pipe size may be checked when reviewing flow area, piping layout, support loading, transport weight, and installation requirements. Final pipe selection should always be verified against project pressure, temperature, fluid type, and material specifications.
Why OD, ID, Thickness, and Weight Matter
Exact OD, ID, wall thickness, and weight values are important for pipe support design, material take-off, transport planning, welding preparation, and installation work. Weight data is also useful for lifting calculations and total piping load estimates, while inside diameter affects flow calculations and system capacity review.
NPS 12 and DN300 Explained
NPS means nominal pipe size in inch units, while DN means diameter nominal in metric units. The current page identifies this pipe as NPS 12 and DN300, which is the standard naming format widely used in piping drawings, isometrics, and procurement specifications.
Conclusion
Schedule 80S Pipe 12 Inch (DN300) is listed on the current page with 323.9 mm OD, 298.5 mm ID, 12.7 mm wall thickness, and 97.47 kg/m weight. It is a useful stainless steel pipe reference for piping engineers, designers, and buyers who need standard dimensional and weight data for project planning and material selection.
How to Use This Schedule 80S Pipe Reference
The listed outside diameter is the primary dimensional reference for fit-up with fittings and other components. The inside diameter is useful when reviewing flow area, lining or corrosion allowances, and clearance through the piping system. Wall thickness supports fabrication and weight checks, but it should not be treated as a complete pressure-design decision by itself.
Schedule, material, and design basis
Schedule 80S identifies a stainless steel wall-thickness series associated with the nominal pipe size. It does not, by itself, define the stainless steel grade, allowable pressure, temperature limit, corrosion performance, joining method, or complete piping-class requirements. Those items must be confirmed from the project specification, material standard, fluid service, and engineering design basis.
Checks for procurement and drafting
- Confirm that the NPS, DN designation, schedule, and reference standard agree across drawings and purchase documents.
- Match the pipe connection dimensions with the selected fittings and flanges before fabrication.
- Use the listed pipe weight for preliminary material take-offs, lifting reviews, and support-load coordination, then include project-specific contents, insulation, valves, and attachments where applicable.
- Verify the stainless steel grade and finish requirements separately; schedule designation alone does not establish them.
- Check the downloadable DWG against the approved design model and fabrication documents before issuing construction drawings.
Useful related references
This page is a natural starting point for related pipe schedule dimensions, stainless steel pipe references, flange dimensions, butt-weld fitting dimensions, pipe support loading, and piping isometric drafting resources. Linking those topics here can help readers move from dimensional lookup to component selection and design coordination without confusing nominal size with a complete engineering specification.
Frequently Asked Questions
What does 80S mean for this pipe?
80S is a stainless steel pipe schedule designation used to identify a wall-thickness series for a given nominal pipe size. It is a dimensional designation, not a complete material or pressure specification.
Are NPS 12 and DN300 the same designation?
They are the inch-based and metric nominal designations shown for this pipe size. Nominal designations support identification and coordination, while the actual outside diameter, inside diameter, and wall thickness should be taken from the dimensional data.
Can the listed weight be used as the final piping support load?
No. The listed pipe weight is a useful reference for preliminary calculations, but final support design should also account for the project’s contents, insulation, valves, fittings, attachments, operating conditions, and applicable load combinations.
Does Schedule 80S alone determine whether the pipe is suitable for a service?
No. Final suitability requires review of the stainless steel grade, fluid, corrosion conditions, pressure, temperature, joining requirements, and project design rules. A qualified engineer should verify the complete selection.
What should be checked before ordering this pipe?
Confirm the nominal size, schedule, reference standard, material grade, end preparation, length requirements, inspection requirements, and compatibility with the specified fittings and flanges.