Use this page as a quick engineering reference for Schedule 40 Pipe 34 Inch, also identified as NPS 34 and DN850. The source data below brings the principal dimensional and weight information together for estimating, drafting, fabrication, and piping layout work.
When using the table, distinguish between the nominal size and the measured pipe dimensions. NPS and DN identify the standard pipe size, while outside diameter, inside diameter, wall thickness, and mass per unit length support different design and coordination tasks.
Schedule 40 pipe 34 inch (DN850) is a standard large-diameter steel pipe size commonly used in piping design, fabrication, drafting, and engineering estimation work. This page provides the standard dimensions and weight data for NPS 34 Schedule 40 pipe based on ANSI / ASME B36.10, including outside diameter, inside diameter, wall thickness, and weight per meter.
This size is often referenced in industrial piping systems, utility lines, water transmission projects, and heavy-duty fabrication work where accurate dimensional data is required for layout, support design, material takeoff, and installation planning.
34 Inch Schedule 40 Pipe Dimensions
- Nominal Pipe Size (NPS): 34 inch
- Diameter Nominal (DN): DN850
- Pipe Schedule: Schedule 40
- Outside Diameter (OD): 864 mm
- Wall Thickness: 17.48 mm
- Inside Diameter (ID): 829.04 mm
- Pipe Weight: 364.92 kg/m
- Pipe Weight Including Water: 904.45 kg/m
- Reference Standard: ANSI / ASME B36.10
Schedule 40 Pipe 34 Inch (DN850) Data Table
| NPS | DN | OD (mm) | Wall Thickness (mm) | ID (mm) | Weight (kg/m) |
|---|---|---|---|---|---|
| 34 inch | DN850 | 864 | 17.48 | 829.04 | 364.92 |
What Is 34 Inch Schedule 40 Pipe Used For?
34 inch Schedule 40 pipe is generally used in large-scale piping systems where a strong and standardized steel pipe is needed. Engineers and fabricators may use this size in:
- Water transmission systems
- Industrial utility piping
- Cooling water lines
- Process piping systems
- Plant layout and pipe rack coordination
- Fabrication and spool drawing preparation
Because it is a large nominal pipe size, the correct dimensions and weight are important for support selection, lifting plans, transportation studies, and accurate engineering calculations.
Why These Dimensions Matter in Engineering
In piping and mechanical design, standard pipe data is used for more than identification. The outside diameter is important for clamps, supports, insulation sizing, and equipment connection layouts. The inside diameter affects flow area and hydraulic calculations. The wall thickness influences pipe strength, fabrication details, and welding preparation, while the pipe weight per meter is essential for load calculations, structural support design, and installation planning.
Using the correct DN850 Schedule 40 pipe dimensions helps reduce drawing errors, material ordering mistakes, and field fit-up issues during construction.
34 Inch DN850 Schedule 40 Pipe for CAD and Drafting Work
For CAD, BIM, and piping drafting work, this size is commonly listed as NPS 34 or DN850. The standard OD of 864 mm is especially useful for routing clearance, support detailing, and nozzle or equipment connection references in 2D and 3D models.
This page can be used as a quick reference for 34 inch Schedule 40 pipe dimensions, DN850 pipe dimensions, and Schedule 40 steel pipe weight per meter during design and estimation work.
Frequently Asked Questions
What is the outside diameter of 34 inch Schedule 40 pipe?
The outside diameter of 34 inch Schedule 40 pipe is 864 mm.
What is the wall thickness of DN850 Schedule 40 pipe?
The wall thickness is 17.48 mm.
What is the inside diameter of Schedule 40 pipe 34 inch?
The inside diameter is 829.04 mm.
How much does 34 inch Schedule 40 pipe weigh?
The pipe weight is 364.92 kg/m. The weight including water is 904.45 kg/m.
Which standard covers these dimensions?
These dimensions are based on ANSI / ASME B36.10.
Conclusion
Schedule 40 pipe 34 inch (DN850) is an important reference size for industrial piping, drafting, fabrication, and engineering calculation work. With an OD of 864 mm, ID of 829.04 mm, wall thickness of 17.48 mm, and weight of 364.92 kg/m, it is a useful standard pipe size for engineers, designers, and project estimators working with large-diameter steel piping systems.
For more pipe schedule data, compare this size with nearby standard sizes such as 32 inch and 36 inch Schedule 40 pipe pages.
How to Use This DN850 Pipe Reference
The dimensional data is most useful when matched to the task being performed. Use the outside diameter for routing envelopes, clamp and support coordination, insulation allowances, and equipment interface layouts. Use the inside diameter when reviewing flow-area assumptions or checking clearances through the pipe bore. Wall thickness and weight are relevant to fabrication details, lifting studies, support reactions, and material estimates.
For a complete design review, the dimensional table should be considered alongside the project piping specification, material requirements, corrosion allowance, joining method, operating conditions, and applicable design code. A schedule designation identifies a standardized pipe wall category; it does not by itself establish pressure capacity or confirm suitability for a particular service.
Related Pipe Design References
Readers comparing this size with other products may also benefit from the site’s pipe schedule chart, NPS versus DN reference, and related pages for Schedule 40 pipe dimensions. Fitting and flange dimensions should be checked separately when developing connection details, while pipe support and pipe rack references can help translate the tabulated weight into a broader layout review.
For drafting workflows, the downloadable DN850 Schedule 40 DWG reference can support preliminary CAD coordination. Confirm units, layer conventions, connection details, and project-specific modeling requirements before incorporating any reference geometry into issued drawings.
Additional Questions About 34 Inch Schedule 40 Pipe
Are NPS 34 and DN850 different pipe sizes?
They are two naming systems used to identify the same referenced nominal pipe size on this page. NPS is the inch-based designation, while DN is the metric nominal designation.
Does Schedule 40 describe the pipe outside diameter?
No. For a given nominal size, the outside diameter is a dimensional property listed separately. The schedule designation is used with the nominal size to identify the referenced wall-thickness category.
Which value should be used for a pipe support layout?
Support coordination normally requires the pipe outside diameter and the applicable operating or installed load information. The tabulated pipe weight is a useful reference, but insulation, contents, fittings, valves, test fluid, supports, and project load cases may also affect the final support design.
Can the DWG file be used as final fabrication geometry?
The downloadable DWG is best treated as a reference for preliminary drafting and coordination. Review units, tolerances, end conditions, connection details, and project requirements before using geometry for fabrication or construction.
Why should fittings and flanges be checked separately?
Pipe dimensions do not provide every detail required for a connection. Fittings and flanges can have their own dimensional, facing, rating, and compatibility requirements, so the applicable component reference and project specification should be reviewed.