This reference page is for engineers, designers, fabricators, estimators, and CAD users working with 34 inch Schedule 20 pipe. Use the dimension summary and data table to check the relationship between NPS, DN, outside diameter, wall thickness, inside diameter, and pipe weight before preparing drawings or material takeoffs.
The downloadable DWG can support drafting workflows, while the dimensional data provides a quick reference for layout, fabrication review, and preliminary estimation. For related research, compare this page with references covering pipe schedules, large-diameter pipe dimensions, pipe fittings, and flange dimensions.
Schedule 20 pipe 34 inch (DN850) is a large-diameter steel pipe size commonly used in piping design, fabrication, drafting, and engineering estimation work. This page provides the standard dimensions, wall thickness, inside diameter, and weight per meter for NPS 34 Schedule 20 pipe based on ASME B36.10.
34 Inch Schedule 20 Pipe Dimensions
- Nominal Pipe Size (NPS): 34 inch
- Diameter Nominal (DN): DN850
- Outside Diameter (OD): 864 mm
- Wall Thickness: 12.7 mm
- Inside Diameter (ID): 838.6 mm
- Pipe Weight: 266.63 kg/m
- Pipe Weight Filled With Water: 818.68 kg/m
- Reference Standard: ASME B36.10
- Pipe Type: Steel Pipe
Schedule 20 Pipe 34 Inch Data Table
| Pipe Size | DN | OD (mm) | Wall Thickness (mm) | ID (mm) | Weight (kg/m) |
|---|---|---|---|---|---|
| 34 inch | 850 | 864 | 12.7 | 838.6 | 266.63 |
What Does Schedule 20 Mean?
Schedule 20 refers to a lighter wall thickness series than heavier schedules such as Schedule 40, Schedule 80, or Schedule 160. For the same nominal pipe size, the outside diameter remains fixed while the wall thickness changes according to the schedule. A lighter wall gives a larger inside diameter and lower pipe weight.
Typical Uses of 34 Inch Schedule 20 Pipe
NPS 34 Schedule 20 pipe is commonly referenced in large-diameter industrial piping systems, utility lines, water-related systems, plant layout drawings, and fabrication work where a large flow area is needed with lower wall thickness than heavier pipe schedules.
Why Pipe Weight Matters
Pipe weight per meter is important for transport planning, crane lifting studies, support design, structural loading, fabrication estimates, and installation planning. For a 34 inch pipe, total line weight can still become very high even with a lighter schedule, so accurate data is essential for engineering work.
34 Inch Schedule 20 Pipe Calculation Notes
The listed weight is based on standard steel pipe dimensions using the outside diameter and wall thickness of the pipe. Actual product weight may vary slightly depending on manufacturing tolerance, material specification, and supplier standard.
Frequently Asked Questions
What is the outside diameter of 34 inch Schedule 20 pipe?
The outside diameter is 864 mm.
What is the wall thickness of DN850 Schedule 20 pipe?
The wall thickness is 12.7 mm.
What is the inside diameter of NPS 34 Schedule 20 pipe?
The inside diameter is 838.6 mm.
How much does 34 inch Schedule 20 pipe weigh?
The approximate weight is 266.63 kg/m.
Which standard covers this pipe size?
This dimension data is based on ASME B36.10 for steel pipe.
Conclusion
Schedule 20 pipe 34 inch (DN850) has an outside diameter of 864 mm, wall thickness of 12.7 mm, inside diameter of 838.6 mm, and a weight of 266.63 kg/m. It is a useful reference for piping design, fabrication, estimating, and industrial engineering work.
How to Use This 34 Inch Pipe Reference
Start with the nominal designation: NPS 34 identifies the inch-based pipe size, while DN850 is the corresponding metric designation used in many international drawings and specifications. These designations help coordinate piping layouts, bills of materials, and procurement documents, but they should not be treated as a direct measurement of the pipe bore.
For drafting and dimensional checks, use the listed outside diameter and wall thickness. The inside diameter is the resulting internal dimension shown in the source data. The weight per meter is useful when developing a material takeoff or reviewing handling and support requirements; project teams should also account for fittings, valves, flanges, contents, insulation, and other attached items when evaluating a complete piping system.
Schedule, Material, and Design Verification
A pipe schedule identifies a wall-thickness series for a nominal pipe size. It does not, by itself, define the complete design basis for pressure, temperature, corrosion allowance, joining method, or allowable stress. Confirm the applicable material specification, manufacturing requirements, corrosion protection, and project design code before using this reference for procurement or final engineering.
When comparing this page with another pipe-size reference, check all of the key fields rather than comparing schedule names alone. Useful comparison points include nominal size, outside diameter, wall thickness, inside diameter, mass, and the governing dimensional standard. This approach also creates natural links to related Schedule 40 pipe, Schedule 80 pipe, pipe weight, and pipe dimension references on the site.
Using the DWG Download
The DWG file is intended as a drafting aid for layouts, coordination, and preliminary detailing. Before issuing a drawing for fabrication, verify units, layer conventions, end conditions, tolerances, material requirements, and any project-specific changes against the approved engineering documents. The CAD file should complement—not replace—the applicable dimensional and design review.
Additional Questions About 34 Inch Schedule 20 Pipe
Is NPS 34 the same designation as DN850?
NPS 34 and DN850 are the inch-based and metric designations presented for the same pipe size reference. Always retain the project-required designation format in drawings and procurement documents.
Can the listed pipe weight be used as the complete installed line weight?
No. The listed value is a pipe weight per unit length. An installed-line assessment may also need to include the contained fluid, fittings, valves, flanges, insulation, supports, and other attachments.
Does Schedule 20 alone confirm pressure suitability?
No. Pressure suitability requires a complete engineering review of material, temperature, corrosion allowance, manufacturing requirements, joining details, and the governing design code.
What should be checked before using the DWG file?
Check the drawing units, scale, dimensional basis, project standards, connection details, and revision status before incorporating the file into a controlled design package.