This reference is intended for engineers, estimators, detailers, fabricators, and procurement teams checking 1 1/2 inch DN40 Schedule XXS pipe. Use the dimension data below to coordinate pipe geometry, material takeoffs, fabrication details, support reviews, and the accompanying CAD reference.
Because NPS is a nominal designation, the named pipe size should not be treated as the actual bore or outside diameter. For related terminology, see the PipeSTD references for pipe dimensions and pipe schedules.
Schedule XXS Pipe 1 1/2 Inch (DN40) is a heavy-wall steel pipe size used in industrial piping systems, plant construction, high-duty utility lines, and fabrication work. This page provides a practical reference for the main dimensions and weight of 1 1/2 inch XXS pipe based on ANSI/ASME B36.10.
For piping engineers, 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 XXS Pipe Dimensions
- Pipe Size: 1 1/2 Inch
- Nominal Diameter: DN40
- Pipe Schedule: XXS (Double Extra Strong)
- Outside Diameter (OD): 48.3 mm
- Inside Diameter (ID): 28 mm
- Wall Thickness: 10.15 mm
- Pipe Weight: 9.55 kg/m
- Pipe Weight Including Water: 10.16 kg/m
- Reference Standard: ANSI/ASME B36.10
Schedule XXS Pipe 1 1/2 Inch Table
| NPS | DN | OD (mm) | ID (mm) | Wall Thickness (mm) | Weight (kg/m) |
|---|---|---|---|---|---|
| 1 1/2″ | 40 | 48.3 | 28 | 10.15 | 9.55 |
What Does Schedule XXS Mean?
Schedule XXS means Double Extra Strong. It is a heavy-wall pipe designation used for applications that need thicker pipe walls than standard or lighter schedules. A thicker wall affects the inside diameter, pipe weight, fabrication requirements, support loading, and handling during installation.
For a size such as 1 1/2 inch DN40 pipe, the jump to XXS creates a much heavier pipe than lighter schedules, so correct dimension and weight data are important for design, lifting, and field work.
Why 1 1/2 Inch DN40 XXS Pipe Dimensions Matter
Knowing the exact dimensions of 1 1/2 inch Schedule XXS 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: Heavy-wall pipes require accurate weight data for safer handling and crane planning.
- Schedule Comparison: Engineers often compare XXS with XS, STD, Sch 80, Sch 160, or other heavy-wall options during design review.
Typical Applications of 1 1/2 Inch Schedule XXS Pipe
This pipe size may be used in:
- Heavy-duty industrial piping
- High-pressure process systems
- Power and utility projects
- Plant piping works
- Oil and gas facilities
- 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 XXS Pipe Reference
The table is most useful when several disciplines need the same verified geometry. Fabricators can check the outside diameter and wall thickness for fit-up and preparation, while estimators can use the listed mass for material takeoff and handling reviews. Designers should use the inside diameter when reviewing the available flow passage, but hydraulic performance also depends on the fluid, operating conditions, fittings, valves, and the complete piping arrangement.
Dimension and weight checks
- Outside diameter: Use the listed OD when coordinating fittings, clamps, sleeves, and connection details. Confirm compatibility with the applicable fitting or flange standard before fabrication.
- Inside diameter: Treat the listed ID as the schedule-specific bore for this pipe entry. It is not interchangeable with the nominal inch designation.
- Wall thickness: The heavy wall affects bevel preparation, welding details, machining, and the available internal passage.
- Pipe weight: The listed pipe mass supports preliminary takeoffs, lifting reviews, transport planning, and support-load checks. Include fittings, valves, insulation, contents, and other attached items where applicable.
- Weight including water: This is a useful contents-loaded reference, but project load cases may require additional operating, testing, insulation, or support loads.
CAD and coordination workflow
The downloadable DWG can support layout and drafting work, but it should be checked against the authoritative table and the project specification before release. Confirm drawing units, connection details, material requirements, and the selected pipe fittings or pipe flanges. A CAD profile is a coordination aid; it does not replace design verification or fabrication inspection.
Related PipeSTD references
For broader comparison work, connect this page with resources covering schedule comparisons, fitting dimensions, flange dimensions, and pipe CAD and DWG files. These related references help users move from a single pipe entry to a coordinated piping model and material list.
FAQ: 1 1/2 Inch Schedule XXS Pipe
Is 1 1/2 inch the actual outside diameter?
No. The inch designation is an NPS nominal size. The applicable outside diameter is the dimension listed in the reference table, so users should use that value for layout and component coordination.
Does Schedule XXS change the pipe outside diameter?
For the same nominal pipe size, schedule changes primarily affect wall thickness, inside diameter, and weight. Always verify the exact schedule entry before selecting mating components or preparing fabrication details.
Does XXS identify a pressure rating?
No. A schedule designation describes pipe wall dimensions; it is not, by itself, an allowable pressure rating. Pressure capability requires review of material, temperature, design code, manufacturing requirements, corrosion considerations, and the project design basis.
Can the listed pipe weight be used for support design?
It can provide a pipe-mass input for preliminary checks, but the final support review should account for contents, fittings, valves, insulation, testing conditions, dynamic effects, and the governing structural or piping requirements.
What should be checked before using the DWG?
Verify the drawing units, scale, geometry, connection interfaces, and revision against the table and project documents. The DWG should be treated as a drafting reference rather than the sole basis for fabrication or engineering approval.