This reference page brings together the dimensional data, terminology, and drafting context for 12 inch Schedule 5S stainless steel pipe. It is intended for engineers, piping designers, fabricators, estimators, procurement teams, and students checking a DN300 pipe layout or specification.
Use the dimensional table and data summary below as the primary reference for this pipe entry. For broader comparisons, this page can also be read alongside related resources covering pipe schedules, NPS and DN designations, stainless steel pipe dimensions, and pipe fittings and flanges.
Schedule 5S Pipe 12 Inch (DN300 mm) is a stainless steel pipe size commonly used in industrial piping systems where corrosion resistance and lighter wall thickness are required. This pipe size is typically referenced under ANSI/ASME B36.19, which is the standard used for stainless steel pipe dimensions.
For this size, the pipe has an outside diameter (OD) of 323.9 mm, an inside diameter (ID) of 315.98 mm, and a wall thickness of 3.96 mm. The listed pipe weight is 31.25 kg/m, while the weight including water is 109.62 kg/m.
Schedule 5S Pipe 12 Inch (DN300 mm) Dimension Table
| Pipe Size | NPS | DN | Outside Diameter (OD) | Inside Diameter (ID) | Wall Thickness | Weight |
|---|---|---|---|---|---|---|
| Schedule 5S Pipe | 12 Inch | DN300 | 323.9 mm | 315.98 mm | 3.96 mm | 31.25 kg/m |
What Is Schedule 5S Pipe?
Schedule 5S is a thin-wall stainless steel pipe schedule listed in ASME B36.19. The “S” designation is commonly used for stainless steel pipe schedules. Compared with heavier schedules, Schedule 5S provides a lighter wall thickness and lower pipe weight, which can help reduce handling effort, support load, and fabrication requirements in suitable applications.
However, pipe schedule selection should always be reviewed against design pressure, temperature, corrosion allowance, project code, and service conditions before final use.
12 Inch Schedule 5S Pipe Data
- Standard: ANSI/ASME B36.19
- Pipe Type: Stainless Steel Pipe
- NPS: 12 Inch
- DN: DN300
- OD: 323.9 mm
- ID: 315.98 mm
- Wall Thickness: 3.96 mm
- Pipe Weight: 31.25 kg/m
- Weight Including Water: 109.62 kg/m
Common Uses of 12 Inch Schedule 5S Pipe
12 inch Schedule 5S stainless steel pipe may be used in applications where corrosion resistance, lighter wall thickness, and good flow capacity are needed. Typical uses may include:
- Water treatment and utility piping systems
- Industrial stainless steel process lines
- Low-pressure transfer piping
- Food and beverage production systems
- Chemical and general fabrication projects
Why DN300 Pipe Dimensions Matter
Many users search for DN300 pipe dimensions to verify piping layout, support spacing, fabrication requirements, transport limits, and compatibility with fittings or connected equipment. For this pipe size, accurate dimensions are important for spool coordination, structural checks, and installation planning.
Knowing the correct 12 inch Schedule 5S pipe dimensions also helps engineers, designers, estimators, buyers, and students compare this size with other schedules when reviewing wall thickness, internal flow area, and total pipe weight.
NPS 12 and DN300 Explained
NPS stands for Nominal Pipe Size in inches, while DN stands for Diameter Nominal in metric designation. For this pipe size:
- NPS 12 = inch-based nominal pipe size
- DN300 = metric nominal designation
Although DN is shown in metric form, the actual outside diameter should always be checked from the dimensional standard. For this size, the OD is 323.9 mm.
Reference for Schedule 5S Pipe 12 Inch
This page provides a quick dimensional reference for engineers, piping designers, students, fabricators, and procurement teams looking for Schedule 5S Pipe 12 Inch (DN300 mm) data in a clear format.
Reference Standard: ANSI/ASME B36.19 stainless steel pipe dimensions.
How to Use This Schedule 5S Pipe Reference
The listed outside diameter is the key interface dimension for many layout, fitting, flange, and support checks. The inside diameter describes the available bore, while wall thickness is used when reviewing fabrication details, corrosion allowance, mechanical requirements, and code compliance.
Schedule 5S identifies a stainless steel pipe wall designation; it is not, by itself, a complete pressure rating or design qualification. Final selection should be checked against the applicable design code, material specification, temperature, pressure, corrosion environment, joining method, and project requirements.
Dimensional and Weight Checks
Pipe weight is useful when estimating material quantities, planning handling, and evaluating support loads. The water-inclusive value shown in the source data provides a reference for a filled-pipe condition, but actual operating loads can vary with the conveyed fluid, insulation, lining, valves, fittings, and other attached components.
NPS, DN, and Drawing Coordination
NPS and DN are nominal designations used to coordinate piping components. They should not be treated as a substitute for checking the actual outside diameter and wall thickness in the dimensional reference. When preparing a spool, plant layout, or equipment connection drawing, confirm that the pipe dimensions agree with the selected fittings, flanges, gaskets, and connected equipment.
Using the DWG Reference
The supplied DWG file can support preliminary drafting and layout coordination. Before issuing a drawing for fabrication, verify drawing units, scale, layer conventions, connection details, and compatibility with the project’s approved component data. A CAD outline should be treated as a drafting aid rather than a replacement for the governing dimensional and design requirements.
For efficient site navigation, link this reference to related pages for pipe dimensions and schedules, stainless steel pipe, DN300 components, flange dimensions, and pipe support design.
Frequently Asked Questions
What does Schedule 5S mean?
Schedule 5S is a stainless steel pipe wall designation associated with the dimensional reference identified in the source content. The schedule describes pipe dimensions; it does not independently establish whether the pipe is suitable for a particular service.
Are NPS 12 and DN300 the same actual diameter?
NPS 12 and DN300 are corresponding nominal designations used for pipe identification. The actual outside diameter should be confirmed from the dimensional data rather than inferred from the nominal label.
What is the difference between pipe weight and weight including water?
Pipe weight refers to the pipe itself as listed in the source data. Weight including water represents a filled-pipe reference condition. Actual installed weight may also include fluid, insulation, coatings, fittings, valves, and supports.
Can this page be used to select a pipe for pressure service?
It can be used as a dimensional reference, but pressure-service selection requires a qualified engineering review of design pressure, temperature, material, corrosion allowance, code requirements, and service conditions.
Can the DWG file be used directly for fabrication?
The DWG file is useful for preliminary drafting and coordination. Fabrication drawings should be checked against approved project documents, component dimensions, connection requirements, and the applicable design standards before release.