This reference is intended for engineers, piping designers, detailers, estimators, fabricators, and procurement teams checking 18 inch Schedule 60 pipe dimensions. Use the table and data summary below to confirm the dimensional basis before coordinating fittings, supports, layouts, material takeoffs, or the accompanying DWG resource.
Because nominal pipe size, schedule, actual diameter, and mass serve different purposes, review each field separately when comparing this pipe with another schedule or coordinating it with connected piping components.
Schedule 60 Pipe 18 Inch (DN450 mm) is a carbon steel pipe size commonly used in heavy-duty piping systems where higher wall thickness and stronger mechanical performance are required. This pipe size is typically referenced under ANSI/ASME B36.10, which is the standard used for wrought steel pipe dimensions.
For this size, the pipe has an outside diameter (OD) of 457 mm, an inside diameter (ID) of 418.9 mm, and a wall thickness of 19.05 mm. The listed pipe weight is 205.75 kg/m, while the weight including water is 343.49 kg/m.
Schedule 60 Pipe 18 Inch (DN450 mm) Dimension Table
| Pipe Size | NPS | DN | Outside Diameter (OD) | Inside Diameter (ID) | Wall Thickness | Weight |
|---|---|---|---|---|---|---|
| Schedule 60 Pipe | 18 Inch | DN450 | 457 mm | 418.9 mm | 19.05 mm | 205.75 kg/m |
What Is Schedule 60 Pipe?
Schedule 60 pipe is a heavier wall steel pipe schedule used when a thicker pipe wall is needed compared with lighter schedules such as Schedule 40. In general, a thicker wall can provide improved strength, durability, and pressure-handling capability, depending on material grade, design temperature, and service conditions.
Pipe schedule selection should always be checked against project requirements such as design pressure, temperature, corrosion allowance, piping code, and fabrication method before final use.
18 Inch Schedule 60 Pipe Data
- Standard: ANSI/ASME B36.10
- Pipe Type: Steel Pipe
- NPS: 18 Inch
- DN: DN450
- OD: 457 mm
- ID: 418.9 mm
- Wall Thickness: 19.05 mm
- Pipe Weight: 205.75 kg/m
- Weight Including Water: 343.49 kg/m
Common Uses of 18 Inch Schedule 60 Pipe
18 inch Schedule 60 steel pipe may be used in applications where a large internal flow path and thicker wall construction are needed. Typical uses may include:
- Industrial process piping systems
- Water transmission and utility piping
- Oil and gas piping applications
- Power plant and heavy-duty piping systems
- Projects requiring higher wall thickness than lighter schedules
Why DN450 Pipe Dimensions Matter
Many users search for DN450 pipe dimensions to verify pipe routing, structural support loads, transportation limits, fabrication details, and compatibility with fittings or connected equipment. For an 18 inch pipe, accurate dimensional data is especially important because weight, lifting, and installation requirements can increase significantly.
Knowing the correct 18 inch Schedule 60 pipe dimensions also helps engineers, detailers, 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 60 Pipe 18 Inch
This page provides a quick dimensional reference for engineers, piping designers, students, fabricators, and procurement teams looking for Schedule 60 Pipe 18 Inch (DN450 mm) data in a clear format.
Reference Standard: ANSI/ASME B36.10 steel pipe dimensions.
How to Use This Schedule 60 Pipe Reference
The existing data presents the principal dimensional and weight information for this pipe size in both tabular and list formats. The outside diameter is useful for layout clearance, support geometry, clamps, and connection coordination, while the inside diameter helps describe the available flow passage. Wall thickness is a key dimensional input for fabrication review and engineering checks.
The listed pipe weight should be considered when reviewing handling, lifting, transportation, support reactions, and structural coordination. The separate value for weight including water represents a different loading condition from the pipe-only value; do not treat the two figures as interchangeable in a project calculation.
Related Pipe and Piping References
For broader reference work, this page can be reviewed alongside resources covering pipe schedules, NPS and DN designations, steel pipe dimensions, pipe fittings, flanges, and pipe support design. These related topics help users connect dimensional data with routing, joining, support, procurement, and drafting decisions.
The included DWG file can support preliminary drafting and coordination. Before issuing fabrication or construction documents, verify the selected component, end connections, material requirements, tolerances, and project-specific design criteria against the applicable engineering documents.
Engineering Review Reminder
A pipe schedule identifies dimensional wall construction; it does not by itself establish an allowable operating pressure or confirm suitability for a particular service. Final selection requires review of material grade, design pressure, temperature, corrosion allowance, applicable piping code, fabrication method, and other project requirements.
Frequently Asked Questions
What are the dimensions of 18 inch Schedule 60 pipe?
The source data lists an outside diameter of 457 mm, an inside diameter of 418.9 mm, and a wall thickness of 19.05 mm. Refer to the dimension table for the complete entry.
Is Schedule 60 a pressure rating?
No. Schedule 60 describes a pipe wall-thickness designation. Pressure capability depends on additional factors such as material grade, design temperature, corrosion allowance, applicable piping code, and service conditions.
What do NPS 18 and DN450 mean?
NPS 18 is the inch-based nominal pipe size designation, while DN450 is the metric nominal designation shown for this pipe size. The actual outside diameter should be taken from the dimensional data rather than inferred from the nominal designation.
Where can I find the drawing reference?
The page includes a DWG download for Schedule 60 Pipe 18 Inch (DN450). Use it as a drafting and coordination reference, then verify project-specific requirements before issuing design or fabrication documents.