Schedule 5S Pipe 18 Inch (DN450 mm) is a stainless steel pipe size commonly used in large piping systems where corrosion resistance and lighter wall thickness are important. This pipe size is typically referenced under ANSI/ASME B36.19, the standard used for stainless steel pipe dimensions.
For this size, the pipe has an outside diameter (OD) of 457 mm, an inside diameter (ID) of 448.62 mm, and a wall thickness of 4.19 mm. The listed pipe weight is 46.79 kg/m, while the weight including water is 204.77 kg/m.
Schedule 5S Pipe 18 Inch (DN450 mm) Dimension Table
| Pipe Size | NPS | DN | Outside Diameter (OD) | Inside Diameter (ID) | Wall Thickness | Weight |
|---|---|---|---|---|---|---|
| Schedule 5S Pipe | 18 Inch | DN450 | 457 mm | 448.62 mm | 4.19 mm | 46.79 kg/m |
What Is Schedule 5S Pipe?
Schedule 5S is a thin-wall stainless steel pipe schedule listed in ASME B36.19. The āSā designation is generally used for stainless steel pipe schedules. Compared with heavier pipe schedules, Schedule 5S provides a lower wall thickness and lighter pipe weight, which can help reduce fabrication load, support requirements, and handling effort in suitable applications.
However, pipe schedule selection should always be checked against design pressure, temperature, corrosion allowance, code requirements, and service conditions before use.
18 Inch Schedule 5S Pipe Data
- Standard: ANSI/ASME B36.19
- Pipe Type: Stainless Steel Pipe
- NPS: 18 Inch
- DN: DN450
- OD: 457 mm
- ID: 448.62 mm
- Wall Thickness: 4.19 mm
- Pipe Weight: 46.79 kg/m
- Weight Including Water: 204.77 kg/m
Common Uses of 18 Inch Schedule 5S Pipe
18 inch Schedule 5S stainless steel pipe may be used in systems where a large internal flow area and corrosion-resistant material are needed. Typical applications 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 DN450 Pipe Dimensions Matter
Many users search for DN450 pipe dimensions to verify piping layout, support design, transport limits, fabrication requirements, and compatibility with fittings or connected equipment. For large-diameter pipe, accurate dimensions are important for spool coordination, structural loading checks, and installation planning.
Knowing the correct 18 inch Schedule 5S pipe dimensions also helps engineers, designers, estimators, buyers, and students compare this pipe size with other schedules when reviewing wall thickness, internal flow area, and total pipe weight.
NPS 18 and DN450 Explained
NPS stands for Nominal Pipe Size in inches, while DN stands for Diameter Nominal in metric designation. For this pipe size:
- NPS 18 = inch-based nominal pipe size
- DN450 = 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 457 mm.
Reference for Schedule 5S Pipe 18 Inch
This page provides a quick dimensional reference for engineers, piping designers, students, fabricators, and procurement teams looking for Schedule 5S Pipe 18 Inch (DN450 mm) data in a clear format.
Reference Standard: ANSI/ASME B36.19 stainless steel pipe dimensions.