Stainless Steel Butt Weld Tee for Industrial Piping Systems
A stainless steel butt weld tee provides a strong and permanent branch connection for industrial piping systems. Unlike threaded or press-fit fittings, butt weld tees are welded directly into the pipeline to create a continuous metal connection for demanding service conditions.
This equal and reducing tee design supports 90-degree branch connections in chemical processing, water treatment, power generation, shipbuilding and other industrial piping systems. In addition, the smooth internal transition helps support stable flow and reduce unnecessary turbulence at the branch point.
Equal vs. Reducing Tee: Choosing the Right Configuration
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Equal Tee: Equal tees are suitable when the main pipe and branch pipe use the same nominal size. Therefore, they are often used for simple branch distribution in straight piping layouts.
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Reducing Tee: Reducing tees are used when the branch outlet has a different size from the main run. As a result, they help connect pipes with different diameters without adding a separate reducer in the branch line.
Before ordering, confirm the main pipe size, branch size, wall thickness, material grade and project standard. This helps ensure that the selected tee matches the piping layout and welding requirements.
Engineering Excellence at Every Branch Point
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Seamless or Welded Construction: Available in seamless (for sizes up to DN600) or welded (for larger diameters) configurations, both manufactured to strict dimensional tolerances.
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Reinforced Branch Design: The branch junction is engineered to withstand internal pressure, thermal stress, and external loads – critical for long-term reliability in demanding environments.
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Smooth Bore Transition: Precision manufacturing ensures a smooth internal surface at the branch intersection, minimizing turbulence and pressure drop.
Materials Engineered for Extreme Environments
Material selection should match the medium, temperature, pressure, corrosion risk and project standard. For this reason, Nonleak offers butt weld tee options in common austenitic and duplex stainless steel grades.
| Material Grade | Key Properties | Typical Applications |
| 304/304L | Excellent corrosion resistance, good formability | General chemical, food processing, water treatment |
| 316/316L | Superior chloride resistance, higher strength | Marine, pharmaceutical, coastal facilities |
| Duplex 2205 | Twice the yield strength of 316L, excellent SCC resistance | Offshore platforms, desalination, sour service |
| Duplex 2507 | Super duplex, extreme corrosion and pitting resistance | Highly aggressive chemical, high-chloride environments |
Global Standard Compliance
This product is designed for projects that require recognized dimensional and material standards. ASME B16.9 is commonly used for factory-made wrought butt-welding fittings, including dimensions, tolerances, testing and markings. In addition, ASTM A403/A403M is commonly referenced for wrought austenitic stainless steel pressure piping fittings.
Nonleak can support project requirements based on ASME, ASTM, DIN, JIS, GB and other applicable standards. However, final material grade, wall thickness and inspection documents should be confirmed according to each project specification.
All tees are manufactured and tested to meet or exceed:
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ASME B16.9 – Factory-Made Wrought Butt-welding Fittings
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GB/T 12459-2005 – Seamless Butt-welding Pipe Fittings
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GB/T 13401-2005 – Plate-Formed Butt-welding Pipe Fittings
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DIN 2615 – Steel Butt-welding Pipe Fittings – Tees
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SH3408 / SH3409 / SH3410 – Petrochemical Industry Standards
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HG/T21635, DL/T695, SY/T0510 – Industry-Specific Standards
Cross-section Diagram
Specification Table for Equal and Reducing Tee Dimensions
| Nominal Pipe Size (NPS) | Outside Diameter At Bevel D (mm) | Center to End C (mm) | ||
| Run | Outlet | Run(C) | Outlet(M) | |
| 1/2 x 1/2 | 21.3 | 21.3 | 25.4 | 25.4 |
| 3/4 x 3/4 | 26.7 | 26.7 | 28.4 | 28.4 |
| 1 x 1 | 33.4 | 33.4 | 38.1 | 38.1 |
| 1-1/4 x 1-1/4 | 42.2 | 42.2 | 47.8 | 47.8 |
| 1-1/2 x 1-1/2 | 48.3 | 48.3 | 57.2 | 57.2 |
| 2 x 2 | 60.3 | 60.3 | 63.5 | 63.5 |
| 2-1/2 x 2-1/2 | 73 | 73 | 76.2 | 76.2 |
| 3 x 3 | 88.9 | 88.9 | 85.9 | 85.9 |
| 3-1/2 x 3-1/2 | 101.6 | 101.6 | 95.2 | 95.2 |
| 4 x 4 | 114.3 | 114.3 | 104.6 | 104.6 |
| 5 x 5 | 141.3 | 141.3 | 124 | 124 |
| 6 x 6 | 168.3 | 168.3 | 142.7 | 142.7 |
| 8 x 8 | 219.1 | 219.1 | 177.8 | 177.8 |
| 10 x 10 | 273.1 | 273.1 | 215.9 | 215.9 |
| 12 x 12 | 323.9 | 323.9 | 254 | 254 |
| 14 x 14 | 355.6 | 355.6 | 279.4 | 279.4 |
| 16 x 16 | 406.4 | 406.4 | 304.8 | 304.8 |
| 18 x 18 | 457.2 | 457.2 | 342.9 | 342.9 |
| 20 x 20 | 508 | 508 | 381 | 381 |
| 22 x 22 | 558.8 | 558.8 | 419.1 | 419.1 |
| 24 x 24 | 609.6 | 609.6 | 431.8 | 431.8 |
| 26 x 26 | 660.4 | 660.4 | 495.3 | 495.3 |
| 28 x 28 | 711.2 | 711.2 | 520.7 | 520.7 |
| 30 x 30 | 762 | 762 | 558.8 | 558.8 |
How to Use the Dimension Table
Use the dimension table as a reference for preliminary product selection. If your project requires a non-standard size, special wall thickness or customized branch configuration, send drawings or specifications with your inquiry so our team can confirm the suitable option.
For complete dimensional data for all sizes (DN10–DN2000), download our Butt-Weld Tee Technical Documentation.
Applications
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Oil & Gas: Pipeline branches, manifold systems, meter runs
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Petrochemical: Reactor feed lines, distillation column connections
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Power Generation: Boiler tubing, steam lines, cooling water systems
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Shipbuilding: Engine room piping, ballast systems, fuel lines
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Water Treatment: Distribution networks, chemical dosing lines
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Mining: Slurry lines, process water systems
Quality Assurance & Testing
Nonleak supports dimensional inspection, visual inspection, material verification and pressure-related testing according to project requirements. Before shipment, the product can be checked for appearance, size, marking, material grade and documentation consistency.
For site pressure testing and final inspection procedures, please review our Testing & Acceptance guidelines.
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Dimensional Inspection: 100% inspection to ASME B16.9 / GB/T12459 tolerances
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Non-Destructive Testing: RT/UT/PT/MT available upon request
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Mechanical Testing: Tensile strength, hardness, flattening tests per batch
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Chemical Analysis: Verification of material composition
Custom Options
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Special Materials: Other grades available upon request
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Non-Standard Dimensions: Custom sizes and wall thicknesses
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End Preparation: Beveled ends standard; special preparations available
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Marking: Laser marking per customer specification
You can also explore our Butt-Weld Fittings category for matching elbows, reducers, caps and other stainless steel butt-weld components.
