This reference provides the dimensional data needed to identify and coordinate Schedule 80 Pipe 1 Inch (DN25) in piping layouts, fabrication documents, and equipment connections. Use the listed outside diameter, inside diameter, wall thickness, and weight when checking pipe dimensions, supports, fittings, and installation requirements.
For related design work, compare this entry with the site’s references for pipe schedules, pipe fittings, flange dimensions, and piping terminology. The downloadable DWG can also support drafting and coordination workflows, subject to project review.
Schedule 80 Pipe 1 Inch (DN25) is a heavy wall steel pipe commonly used in industrial piping systems that require higher strength and thicker pipe walls than lighter schedules. This pipe size is based on ANSI/ASME B36.10 and is widely used in process piping, utility systems, water treatment plants, and mechanical services. For this size, the standard data shows an outside diameter of 33.4 mm, an inside diameter of 24.3 mm, a wall thickness of 4.55 mm, and a pipe weight of 3.24 kg/m.
Schedule 80 Pipe 1 Inch (DN25) Dimensions
- Pipe Standard: ANSI/ASME B36.10
- Nominal Pipe Size: 1 inch
- DN Size: DN25
- Outside Diameter (OD): 33.4 mm
- Inside Diameter (ID): 24.3 mm
- Wall Thickness: 4.55 mm
- Pipe Weight: 3.24 kg/m
- Pipe Weight Including Water: 3.7 kg/m
What Is Schedule 80 Pipe?
Schedule 80 refers to a pipe wall thickness classification. For the same nominal pipe size, a Schedule 80 pipe has a thicker wall and a smaller inside diameter than lower schedule pipes. This makes it a practical choice for systems that need additional pipe strength, durability, and long-term service performance.
Why 1 Inch DN25 Pipe Dimensions Matter
Knowing the exact dimensions of a 1 inch Schedule 80 pipe is important for piping design, fabrication, and installation. The outside diameter helps with flange matching, clamps, and supports. The inside diameter affects flow area and system capacity. The wall thickness is important for strength and service conditions, while the pipe weight per meter is useful for transport, lifting plans, and structural support calculations.
Common Uses of Schedule 80 Pipe 1 Inch (DN25)
This pipe size is often used in industrial and commercial piping systems such as:
- Water treatment and utility piping
- Process and plant piping systems
- Oil and gas applications
- Pump stations and mechanical services
- Heavy-duty industrial pipe networks
1 Inch Schedule 80 Pipe Data Table
| NPS | DN | OD (mm) | ID (mm) | Wall Thickness (mm) | Weight (kg/m) |
|---|---|---|---|---|---|
| 1 inch | 25 | 33.4 | 24.3 | 4.55 | 3.24 |
Additional Information for Engineers and Buyers
Before selecting this pipe size, it is also important to review the material grade, end type, design pressure, corrosion allowance, operating temperature, and project code requirements. While Schedule 80 defines the dimensional wall category, the final pipe selection should always match the actual service condition and engineering specification.
Note: NPS means nominal pipe size in inches, while DN means diameter nominal in millimeters. These are standard reference sizes used for pipe identification.
How to Use This Schedule 80 Pipe Reference
The table and dimensional list below are useful for different stages of piping work. The outside diameter is the primary interface dimension for clamps, supports, sleeves, and connections. The inside diameter is relevant when reviewing flow passage and system capacity. Wall thickness helps distinguish this schedule from lighter-wall options and should be considered alongside material, corrosion allowance, temperature, pressure, and governing design requirements.
Nominal pipe size is an identification system rather than a direct statement of the measured outside diameter. In this entry, NPS identifies the inch-based nominal size and DN provides the corresponding metric designation. The actual dimensions should therefore be taken from the dimensional data provided, rather than inferred from the nominal label.
Weight and Installation Planning
The listed pipe weight supports estimating, handling, transportation, and support coordination. The separate weight including water is useful when considering an operating or filled condition, but it should not replace a project-specific support review. Engineers should also account for fittings, valves, insulation, fluid contents, temporary loads, and applicable structural requirements where relevant.
Using the DWG Download
The linked DWG resource can help with preliminary layout, drafting, and dimensional coordination. Before issuing fabrication or construction documents, verify the drawing against the approved project specification, connection details, material requirements, and applicable design code.
Frequently Asked Questions
What does Schedule 80 mean for this pipe?
Schedule 80 identifies a wall-thickness classification. For the same nominal pipe size, it has a thicker wall and a smaller inside diameter than lighter schedules. The schedule alone does not define material grade, allowable pressure, temperature rating, or corrosion performance.
What are the key dimensions of 1 inch DN25 Schedule 80 pipe?
The source data lists an outside diameter of 33.4 mm, an inside diameter of 24.3 mm, and a wall thickness of 4.55 mm. These values should be used for dimensional coordination and checked against the applicable project requirements.
What is the listed weight of this pipe?
The listed pipe weight is 3.24 kg/m. The source also gives a pipe weight including water of 3.7 kg/m. Use the appropriate condition when planning handling and support requirements.
Does Schedule 80 by itself determine whether the pipe is suitable?
No. Final selection also depends on material grade, end type, design pressure, corrosion allowance, operating temperature, service fluid, and project code requirements. Confirm the complete specification before procurement or installation.