Buttweld Equal Tee Manufacturer, Supplier & Exporter
A buttweld equal tee, also called a straight tee, has three butt-weld ends of the same nominal size: two on the run and one branch at 90°. Raaj Fittings manufactures and exports equal tees to ASME B16.9 in stainless steel, duplex and super duplex, nickel alloys, carbon steel and alloy steel, in seamless and welded construction.
The equal tee is the standard way to split a flow into two streams, combine two streams into one, or take a full-size branch from a header. Because every outlet is the same size, the branch carries full bore flow and the fitting can be installed with the branch in either direction.
Every tee is bevelled for butt welding to the connecting pipe schedule and supplied with EN 10204 3.1 mill test certificates, with 3.2 certification on request.
We export buttweld equal tees to EPC contractors, refineries and stockists across the Middle East and GCC, Europe and the Americas — to ASME B16.9 for US and Gulf projects, or EN 10253 / DIN dimensions for European specifications, with PED-compliant supply on request.
Equal Tee Specifications
½" NPS to 48" NPS and larger to order (DN 15 upwards)
SCH 5S, 10S, 40S, 80S, 10 to 160, STD, XS, XXS
Seamless (hot-formed from pipe) and welded (from plate or welded pipe)
Barred (guide-bar) tees for pigged pipelines, made to order
Bevelled ends for butt welding to ASME B16.25
EN 10204 3.1 mill test certificate as standard; EN 10204 3.2 on request
Materials & Grades
We supply buttweld equal tees in the following materials and grades. All grades are supplied with EN 10204 3.1 / 3.2 Mill Test Certificates.
Stainless Steel Buttweld Equal Tees
Stainless steel buttweld fittings deliver excellent corrosion resistance and are essential in chemical, pharmaceutical, food processing, and marine environments. All grades supplied to ASTM A403 specification.
(ASTM A403 WP304 / WP304L) General corrosion resistance; food, dairy, and chemical service
(ASTM A403 WP316 / WP316L) Enhanced chloride and acid resistance; pharmaceutical, marine, and chemical processing
(ASTM A403 WP316H) Elevated-temperature creep strength for high-temperature process service
(ASTM A403 WP317 / WP317L) Higher molybdenum content; superior corrosion resistance in concentrated acid service
(ASTM A403 WP321) Titanium-stabilised; resists sensitisation at sustained elevated temperatures
(ASTM A403 WP347) Columbium-stabilised; ideal for heat exchangers and high-temperature piping
High-alloy austenitic; superior resistance to hot concentrated sulfuric and phosphoric acids
Duplex & Super Duplex Stainless Steel Buttweld Equal Tees
Duplex and super duplex grades offer approximately twice the yield strength of standard austenitic stainless steel, combined with excellent resistance to stress corrosion cracking and pitting — ideal for offshore, subsea, and chemical processing environments.
(UNS S31803 / S32205) Offshore topsides, chemical plant, desalination, and seawater piping
(UNS S32750) Seawater systems, subsea equipment, FPSOs, and high-chloride offshore environments
(UNS S32760) High-temperature, high-chloride offshore and subsea service applications
Nickel Alloy Buttweld Equal Tees
For the most aggressive corrosive environments — concentrated acids, caustic solutions, sour gas service, and extreme temperatures — we offer buttweld fittings in a full range of nickel alloys.
(UNS N06600) High-temperature oxidation and carburisation resistance
(UNS N06625) Outstanding broad-spectrum corrosion resistance; offshore, chemical, and subsea service
(UNS N08825) Resistance to phosphoric and sulfuric acids; FGD systems and chemical plant
(UNS N10276) Universal corrosion resistance across the widest range of aggressive process media
(UNS N06022) Superior resistance to oxidising and reducing acids and pitting attack
(UNS N04400) Suitable for seawater, hydrofluoric acid, and marine and alkali service
(UNS N08020) Engineered for sulfuric acid and aggressive chemical process service
Exceptional corrosion resistance in seawater and oxidising media at low density
(C70600 / C71500) Preferred for marine seawater piping and naval condenser systems
Carbon Steel Buttweld Equal Tees
Carbon steel is the most widely specified material for general-purpose, hydrocarbon, and elevated-temperature service. The primary grade is ASTM A234 WPB for standard service. For high-yield pipeline fittings, we supply ASTM A860 WPHY grades to MSS SP-75.
Standard carbon steel; primary grade for general-purpose process piping buttweld fittings
Impact-tested carbon steel for low-temperature service down to -46°C (-50°F); LNG and cryogenic piping
High-yield pipeline fittings to MSS SP-75; used in high-pressure oil, gas, and liquid transmission pipelines
Alloy Steel Buttweld Equal Tees
Chromium-molybdenum alloy steel buttweld fittings are specified for high-temperature, high-pressure service in power generation, petrochemical, and refinery applications. All grades supplied to ASTM A234 specification.
(5% Cr · ½% Mo) Refinery high-temperature service; hydrotreating and catalytic reforming units
(9% Cr · 1% Mo) High-temperature hydrogen-rich process service and steam piping
(1¼% Cr · ½% Mo) Thermal power plant steam, feedwater, and reheat piping
(2¼% Cr · 1% Mo) Reactors and high-temperature pressure piping systems in petrochemical plants
(9% Cr · 1% Mo · V · Nb) Ultra-supercritical steam power plant main steam and hot reheat piping
Equal Tee Design
An ASME B16.9 equal tee has the same centre-to-end dimension on the run and the branch — for example about 105 mm for a 4" tee. Seamless tees are formed by hot-extruding the branch out of a length of pipe, so the crotch area is smoothly radiused and thickened to carry the stress concentration where the branch meets the run. Welded tees are formed from plate or welded pipe, and their weld seams are examined by radiography or ultrasonic testing.
- Full-bore branch — the branch is the same size as the run for unrestricted flow.
- Reinforced crotch — the formed shape reinforces the branch without extra pads.
- Butt-welded ends — full-penetration welds that can be radiographed.
- Interchangeable — fits any standard pipe of the same size and schedule.
Equal, Reducing or Lateral?
Where the branch should be smaller than the run, a buttweld reducing tee avoids a separate reducer. Where two branches are needed at the same point, a buttweld cross is used. For a branch with lower turbulence, a lateral tee joins at 45° instead of 90°.
Barred Tees for Pigging
On pipelines that are cleaned or inspected with pigs, a large branch can let the pig stall or turn into the branch. A barred tee has guide bars welded across the branch opening to keep the pig in the run. Barred tees are made to order; give the bar arrangement required by your pipeline specification.
Applications & Industries
- Header and branch connections in refinery and petrochemical piping
- Pipeline branches and tie-ins, including barred tees for pigged lines
- Steam, feedwater and cooling water systems in power plants
- Offshore and seawater systems in duplex, super duplex and copper-nickel
- Chemical and pharmaceutical process lines in stainless steel and nickel alloys
- Fire water rings and utility distribution
Explore the full range of buttweld fittings; for small-bore branches see the forged equal tee.
Testing, Inspection, Marking & Packing
Equal tees are made under our quality assurance process:
- Incoming material verification with PMI testing
- Chemical and mechanical testing to ASTM A403, A234, A420, A860 or the applicable nickel alloy specification
- Heat treatment after forming as required by the grade, with pickling and passivation for stainless steels
- Radiographic or ultrasonic examination of weld seams on welded tees
- Dimensional inspection of centre-to-end, outside diameters, wall thickness at the crotch and bevels
- Marking with grade, size, schedule and heat number
Supplied with EN 10204 3.1 mill test certificates; EN 10204 3.2 certificates, third-party inspection and NACE MR0175 / ISO 15156 compliant material on request.
Fittings are packed for export with plastic end caps protecting the bevels, rust-preventive or VCI wrapping on carbon and alloy steel, and seaworthy wooden cases; marking, tagging and packing to your specification are available on request.
Why Choose Raaj Fittings for Buttweld Equal Tees?
Raaj Sagar Steels has supplied piping components since 2003 and today manufactures buttweld fittings at two plants in India for buyers in the Middle East, Europe and the Americas.
- Manufactured in-house — Buttweld equal tees are made in our own plants, so material, dimensions and delivery stay under our control.
- Ready stock, short lead times — common sizes and grades are held in stock for prompt dispatch; other sizes, grades and specials are manufactured to order.
- Certified quality — ISO 9001:2015, ISO 14001:2015 and ISO 45001:2018 certified; PED 2014/68/EU and IBR supply available, and NACE MR0175 / ISO 15156 material on request.
- 100% material verification — PMI testing on incoming material and EN 10204 3.1 mill test certificates with every order; 3.2 certificates on request.
- Third-party inspection ready — we regularly work with SGS, Bureau Veritas, TÜV and DNV.
- Export documentation — MTCs, certificates of origin, packing lists and inspection reports to suit projects in the GCC, Europe and the Americas.
- Export packing — seaworthy packing with end and face protection, and packing to your specification on request.
- Fast response — our team replies to enquiries within one business day.
Buttweld Equal Tees — FAQs
A buttweld equal tee is a T-shaped fitting with all three ends the same size. It joins a full-size branch to a pipe run at 90° using butt welds.
In an equal tee the branch is the same size as the run. In a reducing tee the branch is smaller, which avoids a separate reducer on the branch.
Seamless tees are hot-formed from a length of seamless pipe, with the branch extruded outwards. This gives a smooth, reinforced crotch and no weld seam.
A barred tee has bars welded across the branch opening so pigs travelling along a pipeline stay in the run and do not enter or stall in the branch.
Give the size, schedule, material grade and construction — for example 8" SCH 40 equal tee, ASTM A234 WPB, seamless, to ASME B16.9.
Yes. We supply buttweld equal tees for projects under the European Pressure Equipment Directive (PED 2014/68/EU), and with IBR certification for Indian boiler applications. NACE MR0175 / ISO 15156 compliant material is also available on request for sour service in the Middle East and the Americas.
