OEM manufacturer ASME B16.9 · ASME B16.25
Butt Weld Equal Tees — ASME B16.9
An equal tee is a butt weld fitting with three openings of the same size, used to branch a line at 90°. Teshi Group manufactures equal tees to ASME B16.9 in carbon, low-temperature, alloy and stainless steels, with the wall matched to your pipe schedule.
Also called: straight tee, butt weld tee, buttweld equal tee, BW tee
What is an Equal Tee?
An equal (straight) tee has a run and a branch of the same nominal size, arranged at 90°. It is formed from pipe or plate so that the branch is integral with the body, giving smooth flow and an even wall without a fabricated cut-out. It is welded to the pipe on all three ends. Equal tees are chosen when the branch line is the same size as the header; when the branch is smaller, a reducing tee is used.
Key features
- Run and branch of the same size, at 90°
- Integral extruded branch — no separate reinforcement pad
- Wall thickness matched to the pipe schedule
- Seamless or welded construction
- Ends bevelled to ASME B16.25
Specification
| Supply | OEM manufacturer — Teshi Group, India |
|---|---|
| Standard | ASME B16.9 |
| Size range | NPS ½"–48" (DN 15–1200) as covered by ASME B16.9 |
| Wall thickness | Matched to the connecting pipe schedule — Sch 5S, 10S, 40, STD, 80, XS, 160, XXS (ASME B36.10M / B36.19M) |
| Ends | Bevelled for butt welding per ASME B16.25 |
| Construction | Seamless (formed from pipe) or welded (formed from plate), per the grade designation, e.g. WPB / WPBW, WP316-S / WP316-W |
| Materials — carbon steel | ASTM A234 WPB, WPC (seamless and welded WPB-W) |
| Materials — high-yield carbon steel | ASTM A860 WPHY 42, 46, 52, 56, 60, 65, 70 (MSS SP-75) |
| Materials — low-temperature carbon steel | ASTM A420 WPL3, WPL6, WPL8, WPL9 |
| Materials — alloy steel (Cr-Mo) | ASTM A234 WP1, WP5, WP9, WP11 Cl 1 / 2 / 3, WP12 Cl 1 / 2, WP22 Cl 1 / 3, WP91, WP92 |
| Materials — stainless steel | ASTM A403 WP304, WP304L, WP304H, WP309, WP310S, WP316, WP316L, WP316H, WP316Ti, WP317, WP317L, WP321, WP321H, WP347, WP347H (seamless S, welded W / WX) |
| Materials — 904L and 6Mo | 904L (UNS N08904, ASTM A403 / B366); 254 SMO / 6Mo (ASTM A403 WPS31254); AL-6XN (UNS N08367, ASTM B366) |
| Materials — duplex stainless steel | ASTM A815 WPS31803, WPS32205 (2205) |
| Materials — super duplex stainless steel | ASTM A815 WPS32750 (2507), WPS32760, WPS32550 |
| Materials — nickel alloys | ASTM B366: Nickel 200 / 201 (N02200 / N02201), Monel 400 (N04400), Inconel 600 (N06600), Inconel 625 (N06625), Incoloy 800 / 800H / 800HT (N08800 / N08810 / N08811), Incoloy 825 (N08825), Hastelloy C276 (N10276), Hastelloy C22 (N06022), Hastelloy B2 / B3 (N10665 / N10675), Alloy 20 (N08020) |
| Materials — titanium | ASTM B363 WPT1, WPT2, WPT7, WPT12; Grade 5 (Ti-6Al-4V) against order |
| Materials — copper-nickel | Cu-Ni 90/10 (UNS C70600) and 70/30 (UNS C71500), made from ASTM B466 / B467 pipe (EEMUA 146 dimensions on request) |
| Grade availability | Every grade listed is made or supplied against order, with EN 10204 3.1 certificates (3.2 / third-party inspection when specified) and PMI on alloy, stainless, duplex and nickel grades. |
| Testing | Visual and dimensional inspection; PMI on alloy and stainless grades; hardness check; RT, UT, MPI or DPT and IGC tests when specified |
| Documents | EN 10204 3.1 mill test certificate; 3.2 / third-party inspection when the order specifies; dimensional inspection report; IBR certification for boiler/steam service when specified |
Applications
- Headers and distribution manifolds
- Process piping in refineries and chemical plants
- Steam and condensate networks
- Firewater ring mains
- Bypass loops around control valves and equipment
Butt weld tee vs fabricated branch
A fabricated branch (stub-in or stub-on) is made by cutting the header and welding a pipe to it, often with a reinforcement pad. A B16.9 tee has the branch formed integrally, so it gives a predictable wall, lower stress intensification and a fully radiographable weld at each end. Tees cost more as a part but reduce fabrication time and are usually required by piping specifications for size-on-size branches.
Technical data sheets
Dimensions & weights
FAQ
Equal Tee: common questions
How is an equal tee specified?
State the nominal size, schedule or wall thickness on all ends, material grade, and seamless or welded construction, for example: Tee equal 6" Sch 40, ASTM A234 WPB, ASME B16.9.
What pressure can a butt weld tee take?
When ordered in the same schedule and an equivalent material to the pipe, a B16.9 tee is rated the same as the straight seamless pipe.
Do you supply tees with different schedules on run and branch?
Yes, tees can be made with a heavier wall on the run than the branch where the piping specification calls for it. Please state both schedules in your enquiry.
Are tees available in low-temperature carbon steel?
Yes. We supply ASTM A420 WPL6 tees for low-temperature service down to −46 °C, with Charpy impact test results reported on the EN 10204 3.1 mill test certificate.
Need a size or grade not listed here?
Our engineering team manufactures against your drawing or datasheet, with dimensional sign-off before dispatch.
Send us your specificationTraceability
From mill heat to your site
- 01
Approved mill material
Received against the mill certificate; heat number registered.
- 02
Forging & machining
Heat number carried through every stage in our Indian works.
- 03
PMI, dimensional & NDT
Every lot inspected to the governing standard; TPI witness on request.
- 04
Stamped & certified dispatch
Hard-stamped pieces with EN 10204 3.1 / 3.2 certificates.
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