PipingFitting.com is a leading pipe tee manufacturer, producing equal tees, reducing tees, and side inlet tees for industrial piping systems. Our tees are made from carbon steel, stainless steel, and alloy steel, manufactured to ASME B16.9, ASME B16.28, DIN, and JIS standards. We supply tees for oil & gas, petrochemical, power, marine, and general industrial applications worldwide.

Equal Tee

An equal tee has three openings of the same diameter, with the branch outlet perpendicular to the run. It is the most common tee type, used for dividing or combining flow in a piping system. Equal tees are available in butt weld (ASME B16.9), socket weld (ASME B16.11), and threaded (ASME B16.11) connections. Standard sizes range from 1/2″ to 24″ NPS.

Reducing Tee

A reducing tee has a branch outlet of a different size than the run openings. This allows connection of a smaller branch line to a larger main pipeline without requiring an additional reducer. Reducing tees are commonly used in instrument taps, sample lines, and drainage connections. The branch size reduction follows standard ratios per ASME B16.9.

Tee Types by Manufacturing Method

• Butt Weld Tees: Wrought steel tees per ASME B16.9, produced by piloting or rotary forging. Most common for high-pressure industrial piping.
• Socket Weld Tees: Forged steel tees per ASME B16.11, for small bore high-pressure services (NPS 2″ and below).
• Threaded Tees: Forged steel tees with NPT/BSP threads, for low-pressure and instrument applications.
• Seamless Tees: Produced from seamless pipe, no weld seam, highest structural integrity for critical services.
• Welded Tees: Fabricated from plate or pipe with a weld seam, cost-effective for large diameter and low-pressure applications.

Tee Materials

• Carbon Steel: A234 WPB, A420 WPL6 (low temp), Q235, Q345, 10#, 20#, 16Mn
• Stainless Steel: A403 WP304, WP304L, WP316, WP316L, WP321, WP310S
• Alloy Steel: A234 WP11 (1.25Cr), WP22 (2.25Cr), WP5 (5Cr), WP91 (9Cr-1Mo)
• Special Alloys: Duplex 2205, Super Duplex 2507, Monel 400, Inconel 625 (on request)

Tee Standards

• ASME B16.9 — Wrought Steel Butt-Welding Fittings (most common)
• ASME B16.28 — Wrought Steel Butt-Welding Short Radius Return Bends and Tees
• ASME B16.11 — Forged Steel Fittings, Socket-Welding and Threaded
• DIN 2615 / EN 10253 — European butt weld tees
• JIS B2312 — Japanese steel pipe tees
• GB/T 13401 — Chinese national standard for steel butt weld fittings

Applications

Pipe tees are fundamental components in every piping system: crude oil and product pipelines, refinery and petrochemical process piping, power plant feedwater and steam systems, marine and offshore piping, HVAC distribution networks, water and wastewater treatment plants, and industrial gas systems. Proper tee selection ensures balanced flow distribution and system reliability.

Quality Assurance

Manufactured under ISO 9001 certification. Each order includes Mill Test Certificate (MTC) per EN 10204 Type 3.1. Available dimensions covered by pressure classes from 150# to 2500#. Third-party inspection by SGS, BV, or as requested. Surface treatment: anti-rust oil, black painting, or as specified.

Request a Tee Quote

Send us: tee type (equal/reducing), material grade, size (run × branch), schedule/wall thickness, standard, quantity, and delivery requirement. We provide a detailed quotation within 24 hours.

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Types of Pipe Tees

Butt weld tees come in five configurations: equal (straight) tee – all three ends the same size; reducing tee – smaller branch, ordered run x run x branch; lateral (Y-tee) – 45° branch for merging flows gently; barred tee – internal bars preventing pig passage into the branch (pigging lines); and the cross (4-way tee) – four outlets at one point. All per ASME B16.9 in A234 WPB carbon steel (“black pipe tee”) and A403 stainless grades.

3-Way and 4-Way Tee Connectors

A standard tee is a 3-way connector: run in, run out, branch out. Add a second branch and it becomes a 4-way connector – the cross. Crosses appear on headers distributing to two opposite branches (sprinkler risers, manifold takeoffs) and on equalizing lines. They cost more than tees (four weld ends, center reinforcement) and are ordered by NPS x NPS (all four ends equal) or with reducing outlets. We manufacture crosses to order – send size and schedule.

Water & Plumbing System Tees

For industrial water systems – cooling headers, firewater rings, pump station manifolds – carbon steel welding tees are the durable choice: full-penetration welds never loosen or leak the way threaded fittings can under vibration. (Household plumbing uses copper/PVC/PEX tees – a different trade.) For plant plumbing-adjacent service, our tees weld to standard NPS pipe with matching schedules. Full tee types guide →