Use this page as a quick reference for Schedule STD Pipe 1 1/4 Inch (DN32) dimensions, weight, and drafting information. The table provides the dimensional data needed to coordinate pipe layouts, fittings, supports, material takeoffs, and procurement documents.
For design workflows, compare the listed dimensions with the applicable pipe schedule, NPS and DN terminology, and connected component references before finalizing a drawing or specification. A DWG resource is also provided below the reference content for users preparing CAD layouts.
Schedule STD Pipe 1 1/4 Inch (DN32) is a steel pipe size commonly used in industrial and utility piping systems where standard dimensions, structural reliability, and dependable flow capacity are important. Based on the current page data under ANSI/ASME B36.10, this pipe size has an outside diameter of 42.2 mm, an inside diameter of 35.08 mm, a wall thickness of 3.56 mm, and a pipe weight of 3.39 kg/m.
1 1/4 Inch Schedule STD Pipe Dimensions
The following values are listed for NPS 1 1/4 Schedule STD pipe, which corresponds to DN32 in metric designation.
- Pipe Size: NPS 1 1/4 Inch
- DN Size: DN32
- Outside Diameter (OD): 42.2 mm
- Inside Diameter (ID): 35.08 mm
- Wall Thickness: 3.56 mm
- Pipe Weight: 3.39 kg/m
- Pipe Weight Including Water: 4.35 kg/m
- Reference Standard: ANSI/ASME B36.10
Schedule STD Pipe 1 1/4 Inch (DN32) Data Table
| Pipe Schedule | NPS | DN | OD (mm) | ID (mm) | Wall Thickness (mm) | Weight (kg/m) |
|---|---|---|---|---|---|---|
| STD | 1 1/4 Inch | 32 | 42.2 | 35.08 | 3.56 | 3.39 |
What Is Schedule STD Pipe?
Schedule STD means Standard Weight in the IPS pipe system and is commonly referenced for carbon steel and steel pipe dimensions under ASME B36.10. In practical piping work, Schedule STD is used as a standard wall thickness designation for many nominal pipe sizes. It helps engineers, fabricators, and buyers confirm dimensional compatibility, estimate weight, and coordinate with fittings, flanges, supports, and structural loads.
Common Uses of 1 1/4 Inch Schedule STD Pipe
1 1/4 inch Schedule STD pipe is commonly used in industrial and utility piping systems where good flow capacity and standard steel pipe dimensions are required. This size is often selected for water, cooling, transmission, and plant services where reliable dimensional data is important for design, fabrication, and construction.
- Water transmission lines for plant and utility service
- Cooling water systems in industrial facilities
- Stormwater and drainage piping in infrastructure projects
- Industrial utility piping for bulk fluid transport
- Pipeline headers and manifolds in process plants
- Pump suction and discharge lines where standard pipe dimensions are needed
- Municipal and public works projects requiring steel pipe sizes
- Replacement and upgrade projects where standard pipe dimensions are required
In practical engineering work, this pipe size may be reviewed when checking flow capacity, support loading, transport weight, handling requirements, and installation planning. Final pipe selection should always be verified against project pressure, temperature, fluid type, corrosion allowance, and material specifications.
Why OD, ID, Thickness, and Weight Matter
Exact OD, ID, wall thickness, and weight values are important for support design, material take-off, transport planning, lifting studies, welding preparation, and installation work. For a pipe size such as 1 1/4 inch DN32, accurate weight data is useful for support design, material planning, and installation review. Inside diameter is also important for flow calculations and hydraulic capacity review.
NPS 1 1/4 and DN32 Explained
NPS means nominal pipe size in inch units, while DN means diameter nominal in metric units. The current page identifies this pipe as NPS 1 1/4 and DN32, which is the standard naming format widely used in piping drawings, specifications, and procurement documents.
Conclusion
Schedule STD Pipe 1 1/4 Inch (DN32) is listed on the current page with 42.2 mm OD, 35.08 mm ID, 3.56 mm wall thickness, and 3.39 kg/m weight. It is a useful steel pipe reference for engineers, designers, and buyers who need standard dimensional and weight data for piping systems and project coordination.
How to Use This Pipe Reference
The most useful first step is to distinguish between the nominal designation and the measured pipe dimensions. NPS 1 1/4 and DN32 identify the nominal size, while the outside diameter, inside diameter, and wall thickness describe the physical section used for coordination and engineering review.
The outside diameter is especially important when checking clearances, clamps, supports, sleeves, branch connections, and compatibility with fittings. The inside diameter is used when reviewing flow paths and hydraulic calculations. Wall thickness supports fabrication and connection checks, while the listed mass per unit length helps with material takeoffs, handling, and support-load review.
Coordination With Related Piping Information
This reference is most useful when reviewed alongside related pages covering pipe schedules, steel pipe dimensions, flange dimensions, pipe fittings, and NPS-to-DN terminology. Those topics help connect the nominal pipe designation to the components and documents used in a complete piping system.
When using the DWG resource, confirm units, drawing scale, connection details, material requirements, and project-specific drafting conventions before incorporating the geometry into a design package. The dimensional table on this page remains the controlling reference for the values presented here.
Engineering Review Reminder
Dimensional compatibility alone does not establish that a pipe is appropriate for a particular service. Final selection should be checked against the project specification, fluid, temperature, pressure requirements, corrosion allowance, joining method, support arrangement, and applicable design basis by the responsible engineering team.
Frequently Asked Questions
What is the outside diameter of Schedule STD Pipe 1 1/4 Inch?
The listed outside diameter is 42.2 mm.
What is the inside diameter of this DN32 pipe?
The listed inside diameter is 35.08 mm.
What is the wall thickness?
The listed wall thickness for this Schedule STD pipe is 3.56 mm.
How much does the pipe weigh?
The listed pipe weight is 3.39 kg/m. The page also lists a weight including water of 4.35 kg/m.
Does Schedule STD identify a pressure rating?
No. Schedule STD identifies a standard wall-thickness designation and dimensional relationship. Pressure suitability must be verified using the project design conditions, material specification, temperature, joining details, and applicable engineering requirements.
Is NPS 1 1/4 the same nominal size as DN32?
On this page, NPS 1 1/4 corresponds to DN32. These are nominal designations used in inch-based and metric-based piping documentation.
Is a CAD file available?
Yes. A DWG download is provided with the page for CAD and drafting reference. Verify the drawing units and project requirements before using it in production documents.