This reference page helps engineers, designers, fabricators, and drafters interpret the available data for 12 inch Schedule 10S pipe, also identified as NPS 12 and DN300. Use the dimensional table for preliminary layout, quantity review, weight estimation, and CAD coordination, then confirm project requirements against the specified material and procurement documents.
For related design work, compare this page with references covering pipe schedules, stainless steel pipe dimensions, pipe fittings and flanges, and pipe support loads. The downloadable DWG file can also support drafting workflows where a dimensional CAD reference is required.
Schedule 10S pipe 12 inch (DN300) is a stainless steel pipe size commonly used in piping design, fabrication, drafting, and engineering reference work. This page provides the standard dimensions, wall thickness, inside diameter, and weight per meter for NPS 12 Schedule 10S pipe based on ASME B36.19.
12 Inch Schedule 10S Pipe Dimensions
- Nominal Pipe Size (NPS): 12 inch
- Diameter Nominal (DN): DN300
- Outside Diameter (OD): 323.9 mm
- Wall Thickness: 4.57 mm
- Inside Diameter (ID): 314.76 mm
- Pipe Weight: 35.99 kg/m
- Pipe Weight Filled With Water: 113.76 kg/m
- Reference Standard: ASME B36.19
- Pipe Type: Stainless Steel Pipe
Schedule 10S Pipe 12 Inch Data Table
| Pipe Size | DN | OD (mm) | Wall Thickness (mm) | ID (mm) | Weight (kg/m) |
|---|---|---|---|---|---|
| 12 inch | 300 | 323.9 | 4.57 | 314.76 | 35.99 |
What Does Schedule 10S Mean?
Schedule 10S is a stainless steel pipe schedule covered by ASME B36.19. For the same nominal pipe size, the outside diameter remains fixed while the wall thickness changes with the schedule. The āSā designation is commonly used for stainless steel pipe schedules.
Typical Uses of 12 Inch Schedule 10S Pipe
NPS 12 Schedule 10S pipe is commonly used in stainless steel piping systems for industrial plants, utility services, food and beverage facilities, water-related systems, and fabrication work where corrosion resistance and dimensional accuracy are important.
Why Pipe Weight Matters
Pipe weight per meter is useful for transport planning, lifting studies, support design, structural loading, fabrication estimates, and installation planning. In stainless steel piping systems, accurate weight data helps improve material handling, support spacing, and total project cost estimation.
12 Inch Schedule 10S Pipe Calculation Notes
The listed weight is based on standard stainless steel pipe dimensions using the outside diameter and wall thickness of the pipe. Actual product weight may vary slightly depending on manufacturing tolerance, material grade, and supplier standard.
Frequently Asked Questions
What is the outside diameter of 12 inch Schedule 10S pipe?
The outside diameter is 323.9 mm.
What is the wall thickness of DN300 Schedule 10S pipe?
The wall thickness is 4.57 mm.
What is the inside diameter of NPS 12 Schedule 10S pipe?
The inside diameter is 314.76 mm.
How much does 12 inch Schedule 10S pipe weigh?
The approximate weight is 35.99 kg/m.
Which standard covers this pipe size?
This dimension data is based on ASME B36.19 for stainless steel pipe.
Conclusion
Schedule 10S pipe 12 inch (DN300) has an outside diameter of 323.9 mm, wall thickness of 4.57 mm, inside diameter of 314.76 mm, and a weight of 35.99 kg/m. It is a useful reference for piping design, drafting, estimating, and stainless steel fabrication work.
How to Read the 12 Inch Schedule 10S Data
The nominal size identifies the pipe designation used in piping documents; it is not the same as a direct measurement of the outside or inside diameter. The table therefore reports the actual outside diameter, wall thickness, and calculated inside diameter separately. These distinctions matter when coordinating pipe with flanges, butt-weld fittings, valves, supports, and adjoining equipment.
Schedule 10S describes the wall-thickness designation for this stainless steel pipe size. A schedule should not be treated as a complete pressure-rating designation: allowable pressure and service suitability also depend on factors such as material specification, temperature, corrosion allowance, joining method, and the applicable design code.
Using the Weight Data in Design Reviews
The listed mass per meter is useful for preliminary material takeoffs, shipping reviews, lifting plans, support-load checks, and installation planning. When the pipe is filled with water, the combined load is higher, so designers should distinguish between empty-pipe and operating-condition load cases. Final support and structural checks should use the project design basis and verified product information.
Drafting and CAD Coordination
The accompanying DWG download is useful for layout and drafting reference. Before issuing fabrication or construction drawings, check the selected fittings, flange dimensions, clearances, joint details, insulation assumptions, and project-specific tolerances against the governing documents. Related internal references on pipe dimensions, flange standards, and CAD pipe details can help maintain consistency across a piping model.
Additional Questions About 12 Inch Schedule 10S Pipe
Is 12 inch the same as DN300?
For this reference designation, 12 inch NPS is identified as DN300. The nominal designation should still be coordinated with the actual dimensional data shown in the table.
Can the listed dimensions be used to select a flange or fitting?
The dimensions provide a starting point for coordination, but the matching component must be checked against its applicable standard, end connection, material, pressure class, and project specification. Use the related flange and fitting references together with the pipe data.
Does Schedule 10S alone establish the allowable working pressure?
No. Schedule identifies a pipe wall-thickness designation; allowable working pressure requires a separate engineering assessment using the material, temperature, design code, joining details, and service conditions.
Why might purchased pipe weigh slightly more or less than the reference value?
Actual mass can vary because of manufacturing tolerances, material grade, surface condition, length, and supplier practices. Procurement and fabrication calculations should use verified product documentation when accuracy is required.
What is the DWG file useful for?
The DWG file can be used as a drafting and layout reference for the stated pipe size. It should be reviewed alongside project drawings and component details before being used in an issued design.