This 40 inch Schedule XS pipe reference helps engineers, drafters, estimators, fabricators, and construction teams interpret the dimensional data for a large DN1000 steel pipe. Use the table and accompanying notes when reviewing pipe layouts, material takeoffs, fabrication details, support loads, transport requirements, and the supplied DWG resource.
For related design work, compare this page with the site’s references for pipe schedules, pipe dimensions, pipe fittings, and pipe flanges. These related components must be checked together during layout and connection reviews.
Schedule XS Pipe 40 Inch (DN1000) is a large steel pipe size used in industrial piping systems, utility lines, water transmission projects, plant construction, and heavy fabrication work. This page provides a practical reference for the main dimensions and weight of 40 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.
40 Inch Schedule XS Pipe Dimensions
- Pipe Size: 40 Inch
- Nominal Diameter: DN1000
- Pipe Schedule: XS (Extra Strong)
- Outside Diameter (OD): 1016 mm
- Inside Diameter (ID): 990.6 mm
- Wall Thickness: 12.7 mm
- Pipe Weight: 314.23 kg/m
- Pipe Weight Including Water: 1084.54 kg/m
- Reference Standard: ANSI/ASME B36.10
Schedule XS Pipe 40 Inch Table
| NPS | DN | OD (mm) | ID (mm) | Wall Thickness (mm) | Weight (kg/m) |
|---|---|---|---|---|---|
| 40″ | 1000 | 1016 | 990.6 | 12.7 | 314.23 |
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 large size such as 40 inch DN1000 pipe, wall thickness matters even more because it has a strong effect on lifting weight, handling, structural loading, and installation planning in real projects.
Why 40 Inch DN1000 Pipe Dimensions Matter
Knowing the exact dimensions of 40 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: Large pipe sections require reliable weight data for safe handling.
- Schedule Comparison: Engineers often compare XS with STD, Sch 40, Sch 60, or Sch 80 during design review.
Typical Applications of 40 Inch Schedule XS Pipe
This pipe size may be used in:
- Industrial process piping
- Water transmission systems
- Power and utility projects
- Large 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 40 inch, the actual outside diameter is 1016 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 40 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 carbon steel pipe dimensions in industrial applications.
How to Use This 40 Inch XS Pipe Reference
The dimensional list identifies the nominal size, DN designation, outside diameter, inside diameter, wall thickness, and mass per unit length. The table is useful for quick comparison and document review, while the supplied DWG file can support drafting and preliminary layout work.
Outside diameter is the external envelope used when checking clearances, supports, clamps, sleeves, and connections. Inside diameter is the internal opening used for flow-area reviews and interface checks. Wall thickness affects the difference between those two diameters and contributes to the listed pipe weight.
The listed water-included weight should be treated separately from the pipe-only weight. It represents a filled-pipe loading condition in the source data and can be relevant when reviewing support reactions, temporary handling, operating conditions, or flooded sections. Confirm the applicable project assumptions before using either value for final design.
Design and Drafting Checks
- Check that the pipe’s outside diameter matches the selected fittings, flanges, valves, clamps, and connection details.
- Use the inside diameter when reviewing hydraulic assumptions, but confirm that the project calculation basis includes all relevant lining, corrosion, or service allowances.
- Use the pipe-only and water-included weights for the appropriate construction or operating condition rather than treating them as interchangeable.
- Coordinate the dimensional data with support details, lifting plans, transport limits, weld preparation requirements, and site access conditions.
- Use the DWG as a drafting reference and verify units, scale, connection details, and project-specific requirements before issuing fabrication or construction documents.
Schedule designations describe dimensional wall categories; they do not by themselves establish material grade, pressure rating, corrosion allowance, welding procedure, or suitability for a particular service. Final selection should be checked against the governing project specification, applicable piping code, material requirements, and qualified engineering review.
Related Pipe Reference Topics
After reviewing the XS dimensions, a useful next step is to compare other pipe schedule references for the same nominal size. Connection work may also require coordinated checks against butt-weld fittings, flange dimensions, and pipe support guidance. Link targets should be selected according to the site’s current page structure.
Frequently Asked Questions
What does XS mean in pipe sizing?
XS means Extra Strong. It is a wall designation used for steel pipe dimensions. For the 40 inch pipe listed here, the XS designation is associated with the source wall thickness, inside diameter, and pipe weight.
Is 40 inch the same as DN1000?
On this reference page, 40 inch is identified with DN1000. NPS and DN are nominal designations, so they should not be assumed to equal the measured outside diameter. Use the listed outside diameter for physical layout and coordination checks.
Why is the inside diameter different from the outside diameter?
The wall occupies the space between the outside surface and the internal bore. Consequently, the inside diameter is smaller, and changing the schedule can change the inside diameter and weight even when the nominal size and outside diameter remain associated with the same pipe size.
What is the difference between pipe weight and pipe weight including water?
Pipe weight refers to the pipe itself in the source data. Pipe weight including water refers to the filled condition listed on this page. Select the condition that matches the design, lifting, support, or operating review being performed.
Can the supplied DWG be used directly for fabrication?
The DWG is provided as a drafting reference. Before fabrication, confirm the drawing’s units and details against the project specification, approved connection information, material requirements, and the applicable engineering review.