Use this Schedule XS Pipe 1 1/2 Inch reference when a project requires a quick dimensional check before fabrication, drafting, estimating, or field installation. The page brings together the nominal size, outside and inside diameters, wall thickness, and weight information needed to interpret the local reference data.
Because pipe terminology can be confusing, it helps to distinguish NPS, DN, outside diameter, inside diameter, and schedule. The nominal size identifies the pipe designation, while the schedule identifies the wall category used for this reference. For related research, this page can be reviewed alongside a pipe schedule guide, an NPS-to-DN reference, and a steel pipe dimensions resource.
Schedule XS Pipe 1 1/2 Inch (DN40) is a steel pipe size commonly used in industrial piping systems, utility lines, water transmission projects, plant construction, and fabrication work. This page provides a practical reference for the main dimensions and weight of 1 1/2 inch XS pipe based on ANSI/ASME B36.10.
For piping engineers, CAD designers, estimators, fabrication teams, and site supervisors, accurate pipe size data is important for layout work, material takeoff, support design, transport planning, and installation checks. This guide presents the essential dimensions in a cleaner format that adds more value than a simple size table.
1 1/2 Inch Schedule XS Pipe Dimensions
- Pipe Size: 1 1/2 Inch
- Nominal Diameter: DN40
- Pipe Schedule: XS (Extra Strong)
- Outside Diameter (OD): 48.3 mm
- Inside Diameter (ID): 38.14 mm
- Wall Thickness: 5.08 mm
- Pipe Weight: 5.41 kg/m
- Pipe Weight Including Water: 6.55 kg/m
- Reference Standard: ANSI/ASME B36.10
Schedule XS Pipe 1 1/2 Inch Table
| NPS | DN | OD (mm) | ID (mm) | Wall Thickness (mm) | Weight (kg/m) |
|---|---|---|---|---|---|
| 1 1/2″ | 40 | 48.3 | 38.14 | 5.08 | 5.41 |
What Does Schedule XS Mean?
Schedule XS stands for Extra Strong. It is a pipe wall designation used in steel pipe standards. The selected schedule affects the wall thickness, which directly affects the inside diameter, pipe weight, fabrication requirements, and support loading.
For a size such as 1 1/2 inch DN40 pipe, wall thickness remains important because it affects total pipe weight, handling requirements, support loads, and installation planning in real projects.
Why 1 1/2 Inch DN40 Pipe Dimensions Matter
Knowing the exact dimensions of 1 1/2 inch Schedule XS pipe is useful for several engineering and construction tasks:
- Fabrication: OD and wall thickness are needed for cutting, beveling, welding, and fit-up work.
- Support Design: Pipe weight per meter helps engineers check support spacing and structural loads.
- Flow Review: ID is useful for estimating internal flow area and hydraulic performance.
- Transport and Lifting: Accurate weight data supports safer handling and planning.
- Schedule Comparison: Engineers often compare XS with STD, Sch 40, Sch 60, or Sch 80 during design review.
Typical Applications of 1 1/2 Inch Schedule XS Pipe
This pipe size may be used in:
- Industrial process piping
- Water transmission systems
- Power and utility projects
- Plant piping works
- Infrastructure construction
- Custom steel fabrication and spool projects
Engineering Notes
NPS means Nominal Pipe Size, while DN means Diameter Nominal. Although this pipe is called 1 1/2 inch, the actual outside diameter is 48.3 mm according to the standard. The inside diameter changes with the pipe schedule because wall thickness changes from one schedule to another.
That means if you compare the same 1 1/2 inch pipe in a different schedule, the OD usually stays the same, while the ID, wall thickness, and pipe weight will change.
Reference
The dimension data on this page is based on ANSI/ASME B36.10, which is widely used for steel pipe dimensions in industrial applications.
How to Use This XS Pipe Reference
Start with the nominal designation when selecting a pipe row for a layout or material takeoff. Then confirm the outside diameter for dimensional coordination, the inside diameter for internal clearance and flow review, and the wall thickness for fabrication and fit-up planning.
The weight entry is useful for estimating, handling, support-load reviews, and spool planning. The water-inclusive value should be kept separate from the bare-pipe weight when preparing lifting, transport, or support information. Any final support, structural, hydraulic, or pressure design decision should be checked against the project specification and the applicable engineering requirements.
Related Pipe Design Checks
- Dimensional coordination: Compare the listed outside diameter with fittings, flanges, valves, sleeves, and connected equipment.
- Fabrication review: Use the wall information when checking cutting, beveling, welding, and fit-up details.
- Schedule comparison: When comparing another schedule, verify whether the outside diameter is shared while the inside diameter, wall thickness, and weight differ.
- Drawing preparation: Keep nominal size and actual dimensions clearly distinguished in CAD details, spool drawings, and material lists.
- Procurement verification: Confirm the selected material, dimensional standard, manufacturing requirements, and project specification before ordering.
Terminology to Keep Consistent
NPS and DN are nominal designations, not interchangeable descriptions of the measured outside diameter. The outside diameter is the useful reference for many physical coordination checks, while the inside diameter is affected by wall thickness. Keeping these terms consistent helps prevent errors when moving between piping specifications, CAD drawings, bills of materials, and field measurements.
Frequently Asked Questions
What does XS mean for this pipe?
XS means Extra Strong. In this reference, it identifies the pipe wall designation and is associated with the listed wall thickness, inside diameter, and weight.
Does the nominal size equal the measured outside diameter?
No. The nominal size is a designation used to identify the pipe, while the measured outside diameter is a separate dimensional value shown in the reference data.
Why is the inside diameter important?
The inside diameter helps with internal clearance, flow-area review, connection coordination, and comparison with another schedule of the same nominal size.
Which weight should be used for support or lifting discussions?
Use the bare-pipe weight for the pipe itself and keep the water-inclusive value separate when reviewing filled-pipe handling or loading conditions. Confirm the design basis before finalizing supports or lifting arrangements.
Can this page replace a project specification?
No. It is a dimensional reference based on the stated standard. Material grade, manufacturing requirements, tolerances, joining details, design conditions, and project specifications still require separate verification.
What related references should be reviewed?
Useful companion resources include a pipe schedule comparison, an NPS and DN terminology guide, steel pipe dimensions, fittings and flange dimensions, and CAD or DWG drafting references.