Lateral Tee & Wye Manufacturer, Supplier & Exporter
A lateral tee is a buttweld fitting whose branch joins the run at 45° instead of 90°. A wye (Y-fitting) splits one line into two branches at equal angles. Raaj Fittings manufactures and exports lateral tees and wyes in stainless steel, duplex and super duplex, nickel alloys, carbon steel and alloy steel, with bevelled ends for butt welding.
Because the branch flow turns through only 45°, a lateral creates far less turbulence and pressure loss than a standard 90° tee. That makes it the preferred branch connection for slurry and solids-handling lines, high-velocity and erosive service, and drainage and flare systems where flows must merge smoothly.
Every fitting is supplied with EN 10204 3.1 mill test certificates, with 3.2 certification on request.
We export lateral 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.
Lateral Tee / Wye Specifications
½" NPS to 24" NPS; larger sizes to order
45° equal lateral, 45° reducing lateral, and wye (Y) fittings
SCH 5S to XXS, including STD, XS, SCH 40 and 80
To our standard dimensions or the purchaser’s drawing; materials, wall thicknesses and tolerances as for ASME B16.9 fittings
Seamless (formed) and welded / fabricated, with weld seams examined
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 lateral tees in the following materials and grades. All grades are supplied with EN 10204 3.1 / 3.2 Mill Test Certificates.
Stainless Steel Lateral 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 Lateral 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 Lateral 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 Lateral 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 Lateral 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
Why Choose a Lateral Over a Tee?
In a 90° equal tee the branch flow meets the run head-on, which causes turbulence, pressure loss and wear at the junction. A 45° lateral lets the branch flow merge in the same general direction as the run, so the streams combine smoothly.
- Lower pressure drop — less energy lost at the junction.
- Less erosion — reduced impingement wear in slurry, sand-laden and high-velocity lines.
- Better drainage — merging flows in drain and flare headers without back-up.
- Smooth splitting — a wye divides flow evenly between two branches.
Lateral or Wye?
A lateral keeps the run straight and adds a branch at 45°; it is used to add a flow into a header or take one out. A wye has two branches at equal angles from the inlet, and is used where one line must divide into two equal streams. Both can be made in reducing sizes.
Dimensions and Design
ASME B16.9 does not tabulate lateral tees, so dimensions follow our standard or the purchaser’s drawing, while materials, wall thickness and end preparation match ASME B16.9 fittings. Because the 45° branch opening is larger than a 90° opening, laterals for higher pressures may need extra reinforcement; this is confirmed by calculation at the design stage. For a simple 45° change of direction, see the 45° elbow.
Applications & Industries
- Slurry, tailings and solids-handling pipelines in mining and minerals
- Pneumatic conveying and dust collection systems
- Flare, relief and drain headers in refineries and petrochemical plants
- High-velocity water and process lines
- Pulp and paper and wastewater treatment plants
For abrasive slurries, laterals are frequently specified with a heavier wall than the connecting pipe, giving extra wear allowance at the junction where erosion is concentrated. Let us know the expected service so the wall thickness can be selected accordingly.
Explore the full range of buttweld fittings.
Testing, Inspection, Marking & Packing
Laterals and wyes are made under our quality assurance process:
- Incoming material verification with PMI testing
- Chemical and mechanical testing to the applicable ASTM specification
- Radiographic or ultrasonic examination of weld seams on welded fittings
- Dimensional inspection of branch angle, centre-to-end dimensions, wall thickness and bevels against the drawing
- Marking with grade, size, schedule and heat number
Supplied with EN 10204 3.1 mill test certificates; EN 10204 3.2 certificates and third-party inspection are available 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 Lateral 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 — Lateral 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.
Lateral Tees — FAQs
A lateral tee is a pipe fitting with a branch that joins the run at 45° instead of 90°. It gives smoother merging of flows with lower pressure drop and erosion.
A lateral has a straight run with one branch at 45°. A wye divides one inlet into two branches at equal angles, splitting the flow evenly.
In slurry and solids-handling lines, pneumatic conveying, flare and drain headers, and high-velocity lines where a 90° tee would cause turbulence and wear.
ASME B16.9 does not tabulate laterals. They are made to the manufacturer’s standard or the purchaser’s drawing, with materials and end preparation matching B16.9 fittings.
Yes. Laterals and wyes can be made with branches smaller than the run, to order.
Yes. We supply lateral 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.
