ASME B16.9 Buttweld Tee

Manufacturer of Equal Tee, Unequal Tee | ASME/ANSI B16.9, ANSI B16.28, MSS-SP-43

A Buttweld Tee is a versatile pipe fitting used to connect three sections of piping, allowing for efficient branching or flow direction changes. Available in equal, reducing, or unequal configurations, buttweld tees are manufactured in various materials, including stainless steel, carbon steel, and alloy steel, to suit diverse applications. Commonly used in industries such as oil & gas, petrochemicals, and power generation, these tees provide a strong, leak-proof connection when welded. Their seamless or welded construction ensures durability and resistance to high pressure and temperature environments.

An equal tee features three outlets of the same size, ensuring uniform flow distribution, while an unequal tee or reducing tee connects pipes of different sizes, enabling controlled flow or pressure adjustments. Both are essential in industrial piping systems, manufactured from materials like stainless steel and carbon steel.

At Ample Alloys, our company policies are centered around delivering high-quality products and exceptional customer service. We ensure that all our buttweld tees and fittings meet international standards, with a strong focus on precision and reliability. Our commitment to customer satisfaction drives us to offer competitive pricing, on-time delivery, and ongoing support. We also prioritize sustainability, using eco-friendly practices throughout our manufacturing process. With a focus on innovation and ethical business practices, we aim to build lasting relationships with our clients, suppliers, and employees, ensuring mutual success and growth.

ASME B16.9 Buttweld Tee

Seamless & Welded Buttweld Tee, Stainless Steel Buttweld Tee, Lateral Tee, Straight Tee, Carbon Steel Buttweld Tee, Equal Buttweld Pipe Tee, SS Reducing Tee, High-Pressure Buttweld Tee, High-Quality Buttweld Tee for Industrial Applications

Butt weld Pipe Tee Specifications

Size Range

1/8” NB TO 48” NB. (Seamless & 100% X-Ray Welded, Fabricated)

Wall Thickness

Sch 5s, 10s, 40s, 80s, 10, 20, 40, STD, 60, XS, 100, 120, 140, 160, Sch XXS

Stainless Steel

ASTM A403 WP 304, 304L, 304H, 316, 316L, 316H, 317, 317L, 321, 321H, 310, 310S, 347, 904L, etc.

Standards / Dimension

ASME B16.9, ASME B16.28, MSS SP-43, MSS SP-75, ASTM A234, ASTM A403, DIN 2605, 2615, 2616, 2617, 10253.

Type / Form

Equal Tee, Unequal Tee, Lateral Tee, Straight Tee, Reducer Tee.

Alloy Steel

ASTM A234, WP1, WP5, WP9, WP11, WP22, WP91, etc.

Bending Radius

R=1D, 2D, 3D, 5D, 6D, 8D, 10D or Custom

Carbon Steel

ASTM A234, A420, MSS-SP-75, WPB, WPL3, WPL6, WPHY 42, WPHY 46, WPHY 52, WPHY 56, WPHY 60, WPHY 65, WPHY 70

Duplex & Super Duplex

ASTM A815 / A815M, UNS S31803 / 2205, UNS S32205, UNS S32101 / LDX 2101, UNS S32750 / 2507, UNS S32760, UNS S32550 / Ferralium 255.

Buttweld Straight Tee/ Equal Tee Dimensions

ASME B16.9 Buttweld Straight Tee/ Equal Tee

Nominal  Outside  Inside  Wall  Center  Center  Pipe  Weight 
Pipe Size Diameter Diameter Thickness T To End C To End M Schedule Pounds
1/2 0.84 0.622 0.109 1 1 40 0.35
3/4 1.05 0.824 0.113 1.12 1.12 40 0.5
1 1.32 1.049 0.133 1.5 1.5 40 0.75
1 1/4 1.66 1.38 0.14 1.88 1.88 40 1.3
1 1/2 1.9 1.61 0.145 2.25 2.25 40 1.9
2 2.38 2.067 0.154 2.5 2.5 40 3.2
2 1/2 2.88 2.469 0.203 3 3 40 5.8
3 3.5 3.068 0.216 3.38 3.38 40 7.2
3 1/2 4 3.548 0.226 3.75 3.75 40 9.5
4 4.5 4.026 0.237 4.12 4.12 40 12.7
5 5.56 5.047 0.258 4.88 4.88 40 20.8
6 6.62 6.065 0.28 5.62 5.62 40 33.1
8 8.62 7.981 0.322 7 7 40 56.5
10 10.75 10.02 0.365 8.5 8.5 40 90.9
12 12.75 12 0.375 10 10 * 136
14 14 13.25 0.375 11 11 30 162
16 16 15.25 0.375 12 12 30 206
18 18 17.25 0.375 13.5 13.5 * 272
20 20 19.25 0.375 15 15 20 350
24 24 23.25 0.375 17 17 20 508
30 30 29.24 0.38 22 22 * 835
36 36 35.24 0.38 26.5 26.5 * 1,294
42 42 41.24 0.38 30 28 * 1,495
48 48 47.24 0.38 35 33 * 2,300

Buttweld Reducing Tee/ Unequal Tee Dimensions

ASME B16.9 Buttweld Reducing Tee/ Unequal Tee

Nominal
Pipe Size		 Dimensions of Run Dimensions of Branch Pipe 
Schedule		 Weight
Pounds
Outside
Diameter		 Wall
Thickness T		 Inside
Diameter		 Center 
to End C		 Outside 
Diameter		 Wall 
Thickness T		 Outside 
Diameter		 Center
to End M
3/4 x 1/2 1.05 0.113 0.824 1.12 0.84 0.109 0.622 1.12 40 0.41
1 1/2 x 1 1/4 1.9 0.145 1.61 2.25 1.66 0.14 1.38 2.25 40 2
1 1/2 x 1 1.9 0.145 1.61 2.25 1.32 0.133 1.05 2.25 40 1.9
1 1/2 x 3/4 1.9 0.145 1.61 2.25 1.05 0.113 0.824 2.25 40 1.8
1 1/2 x 1/2 1.9 0.145 1.61 2.25 0.84 0.109 0.622 2.25 40 1.8
1 1/4 x 1 1.66 0.14 1.38 1.88 1.32 0.133 1.05 1.88 40 1.3
1 1/4 x 3/4 1.66 0.14 1.38 1.88 1.05 0.113 0.824 1.88 40 1.3
1 1/4 x 1/2 1.66 0.14 1.38 1.88 0.84 0.109 0.622 1.88 40 1.3
1 x 3/4 1.32 0.133 1.05 1.5 1.05 0.113 0.824 1.5 40 0.81
1 x 1/2 1.32 0.133 1.05 1.5 0.84 0.109 0.622 1.5 40 0.78
2 1/2 x 2 2.88 0.203 2.47 3 2.38 0.154 2.01 2.75 40 5.4
2 1/2 x 1 1/2 2.88 0.203 2.47 3 1.9 0.145 1.61 2.62 40 5.1
2 1/2 x 1 1/4 2.88 0.203 2.45 3 1.66 0.14 1.38 2.5 40 4.8
2 1/2 x 1 2.88 0.203 2.45 3 1.32 0.133 1.05 2.25 40 4.6
2 x 1 1/2 2.38 0.154 2.07 2.5 1.9 0.145 1.61 2.38 40 3.1
2 x 1 1/4 2.38 0.154 2.07 2.5 1.66 0.14 1.38 2.25 40 3
2 x 1 2.38 0.154 2.07 2.5 1.32 0.133 1.05 2 40 2.8
2 x 3/4 2.38 0.154 2.07 2.5 1.05 0.113 0.824 1.75 40 2.5
3 1/2 x 3 4 0.226 3.55 3.75 3.5 0.216 3.07 3.62 40 9.8
3 1/2 x 2 1/2 4 0.226 3.55 3.75 2.88 0.203 2.47 3.5 40 9.4
3 1/2 x 2 4 0.226 3.55 3.75 2.38 0.154 2.07 3.25 40 9.2
3 1/2 x 1 1/2 4 0.226 3.55 3.75 1.9 0.145 1.61 3.12 40 8.9
3 x 2 1/2 3.5 0.216 3.07 3.38 2.88 0.203 2.47 3.25 40 7.2
3 x 2 3.5 0.216 3.07 3.38 2.38 0.154 2.07 3 40 7
3 x 1 1/2 3.5 0.216 3.07 3.38 1.9 0.145 1.61 2.88 40 6.8
3 x 1 1/4 3.5 0.216 3.07 3.38 1.66 0.14 1.38 2.75 40 6.6
3 x 1 3.5 0.216 3.07 3.38 1.315 0.133 1.05 2 5/8 40 6.5
4 x 3 1/2 4.5 0.237 4.03 4.12 4 0.226 3.55 4 40 11.9
4 x 3 4.5 0.237 4.03 4.12 3.5 0.216 3.07 3.88 40 11.6
4 x 2 1/2 4.5 0.237 4.03 4.12 2.875 0.203 2.47 3.75 40 11.4
4 x 2 4.5 0.237 4.03 4.12 2.38 0.154 2.07 3.5 40 11.2
4 x 1 1/2 4.5 0.237 4.03 4.12 1.9 0.145 1.61 3.38 40 11.2
5 x 4 5.56 0.258 5.05 4.88 4.5 0.237 4.03 4.62 40 20.5
5 x 3 1/2 5.56 0.258 5.05 4.88 4 0.226 3.55 4.5 40 20
5 x 3 5.56 0.258 5.05 4.88 3.5 0.216 3.07 4.38 40 19.4
5 x 2 1/2 5.56 0.258 5.05 4.88 2.88 0.203 2.47 4.25 40 19
5 x 2 5.56 0.258 5.01 4.88 2.38 0.154 2.07 4.12 40 18.8
6 x 5 6.62 0.28 6.07 5.62 5.62 0.258 5.05 5.38 40 32
6 x 4 6.62 0.28 6.07 5.62 4.5 0.237 4.026 5.12 40 30.5
6 x 3 1/2 6.62 0.28 6.07 5.62 4 0.226 3.55 5 40 30
6 x 3 6.62 0.28 6.07 5.62 3.5 0.216 3.07 4.88 40 30
6 x 2 1/2 6.62 0.28 6.07 5.62 2.88 0.203 2.47 4.75 40 29.7
6 x 2 6.62 0.28 6.07 5.62 2.38 0.154 2.07 4.75 40 29
8 x 6 8.62 0.322 7.981 7 6.62 0.28 6.065 6.62 40 56.5
8 x 5 8.62 0.322 7.981 7 5.56 0.258 5.047 6.38 40 54
8 x 4 8.62 0.322 7.981 7 4.5 0.237 4.026 6.12 40 53.2
8 x 3 1/2 8.62 0.322 7.981 7 4 0.226 3.548 6 40 53
8 x 3 8.62 0.322 7.981 7 3.5 0.216 3.068 6 40 52
10 x 8 10.75 0.365 10.02 8.5 8.62 0.322 7.981 8 40 86.5
10 x 6 10.75 0.365 10.02 8.5 6.62 0.28 6.065 7.62 40 85.9
10 x 5 10.75 0.365 10.02 8.5 5.56 0.258 5.047 7.5 40 82.5
10 x 4 10.75 0.365 10.02 8.5 4.5 0.237 4.026 7.25 40 82
10 x 3 10.75 0.365 10.02 8.5 3.5 0.216 3.068 7.25 40 79
12 x 10 12.75 0.375 12 10 10.75 0.365 10.02 9.5 * 123
12 x 8 12.75 0.375 12 10 8.62 0.322 7.981 9 * 120
12 x 6 12.75 0.375 12 10 6.62 0.28 6.065 8.62 * 118
12 x 5 12.75 0.375 12 10 5.56 0.258 5.047 8.5 * 117
12 x 4 12.75 0.375 12 10 4.5 0.237 4.026 8.5 * 112
14 x 12 14 0.375 13.25 11 12.75 0.375 12 10.62 30 151
14 x 10 14 0.375 13.25 11 10.75 0.365 10.02 10.12 30 148
14 x 8 14 0.375 13.25 11 8.62 0.322 7.981 9.75 30 146
14 x 6 14 0.375 13.25 11 6.62 0.28 6.065 9.38 30 145
16 x 14 16 0.375 15.25 12 14 0.375 13.25 12 30 221
16 x 12 16 0.375 15.25 12 12.75 0.375 12 11.62 30 213
16 x 10 16 0.375 15.25 12 10.75 0.365 10.02 11.12 30 197
16 x 8 16 0.375 15.25 12 8.62 0.322 7.981 10.75 30 190
16 x 6 16 0.375 15.25 12 6.62 0.28 6.065 10.38 30 180
18 x 16 18 0.375 17.25 13.5 16 0.375 15.25 13 * 262
18 x 14 18 0.375 17.25 13.5 14 0.375 13.25 13 * 248
18 x 12 18 0.375 17.25 13.5 12.75 0.375 12 12.62 * 241
18 x 10 18 0.375 17.25 13.5 10.75 0.365 10.02 12.12 * 229
18 x 8 18 0.375 17.25 13.5 8.62 0.322 7.981 11.75 * 216
20 x 18 20 0.375 19.25 15 18 0.375 17.25 14.5 20 352
20 x 16 20 0.375 19.25 15 16 0.375 15.25 14 20 339
20 x 14 20 0.375 19.25 15 14 0.375 13.25 14 20 327
20 x 12 20 0.375 19.25 15 12.75 0.375 12 13.62 20 315
20x 10 20 0.375 19.25 15 10.75 0.365 10.02 13.12 20 305
20 x 8 20 0.375 19.25 15 8.62 0.322 7.981 12.75 20 293
24 x 20 24 0.375 23.25 17 20 0.375 19.25 17 20 500
24 x 18 24 0.375 23.25 17 18 0.375 17.25 16.5 20 487
24 x 16 24 0.375 23.25 17 16 0.375 15.25 16 20 475
24 x 14 24 0.375 23.25 17 14 0.375 13.25 16 20 465
24 x 12 24 0.375 23.25 17 12.75 0.375 12 15.62 20 450
24 x 10 24 0.375 23.25 17 10.75 0.365 10.02 15.12 20 447
30 x 24 30 0.38 29.24 22 24 0.38 23.24 21 * 795
30 x 20 30 0.38 29.24 22 20 0.38 19.24 20 * 749
30 x 18 30 0.38 29.24 22 18 0.38 17.24 19.5 * 727
36 x 30 36 0.38 35.24 26.5 30 0.38 29.24 25 * 1,207
36 x 24 36 0.38 35.24 26.5 24 0.38 23.24 24 * 1,129
36 x 20 36 0.38 35.24 26.5 20 0.38 19.24 23 * 1,072
36 x18 36 0.38 35.24 26.5 18 0.38 17.24 22.5 * 1,136
42 x 40 42 0.38 41.24 30 40 0.38 39.24 28 * 1,468
42 x 36 42 0.38 41.24 30 36 0.38 35.24 28 * 1,415
42 x 30 42 0.38 41.24 30 30 0.38 29.24 28 * 1,327
42 x 24 42 0.38 41.24 30 24 0.38 23.24 26 * 1,248
48 x 42 48 0.38 47.24 35 42 0.38 41.24 32 * 2,207
48 x 38 48 0.38 47.24 35 38 0.38 37.24 32 * 2,154
48 x 36 48 0.38 47.24 35 36 0.38 35.24 31 * 2,127
48 x 30 48 0.38 47.24 35 30 0.38 29.24 30 * 2,048

ASME B16.9 Tee Tolerance

Dimension Tolerance
Outside Diameter ±1/8 inch or ±3 mm
Wall Thickness ±12.5% of specified wall thickness
Length of the Tee ±1/2 inch or ±12.7 mm
Branch Length ±1/4 inch or ±6.35 mm
Branch Angle ±1°
Center to End Distance ±1/8 inch or ±3 mm
Branch Diameter ±1/8 inch or ±3 mm

Common Buttweld Tee Standards

These standards ensure the buttweld tees meet the necessary safety, performance, and quality criteria for use in industries such as oil and gas, petrochemical, power generation, and more.

  1. ASME Standards:
    • ASME B16.9: Factory-Made Wrought Buttwelding Fittings.
    • ASME B16.25: Buttwelding Ends (preparation of ends for welding).
    • ASME Standards: Wrought Steel Buttwelding Short Radius Elbows and Returns.
  2. ASTM Standards:
    • ASTM A234: Standard Specification for Piping Fittings of Wrought Carbon Steel and Alloy Steel for Moderate and High-Temperature Service.
    • ASTM A403: Standard Specification for Wrought Austenitic Stainless Steel Piping Fittings.
    • ASTM A815: Standard Specification for Wrought Ferritic, Ferritic/Austenitic (Duplex), and Martensitic Stainless Steel Piping Fittings.
    • ASTM A860: Standard Specification for High-Strength Low-Alloy Welded Fittings (commonly used in pipelines with high strength requirements).
  3. API Standards:
    • API 5L: Specification for Line Pipe (not directly for fittings but related to pipe material in oil and gas industries).
    • API 6A: Specification for Wellhead and Christmas Tree Equipment (covers piping components but specific to high-pressure environments in oil fields).
  4. MSS (Manufacturers Standardization Society) Standards:
    • MSS SP-43: Wrought and Fabricated Butt-Welding Fittings for Low-Pressure, Corrosion Resistant Applications (commonly used for stainless steel in low-pressure applications).
    • MSS SP-75: Specification for High-Strength Wrought, Butt-Welding Fittings (used in oil and gas for high-strength requirements).
    • MSS SP-79: Socket-Welding Reducer Inserts.
    • MSS SP-83: Carbon Steel Pipe Unions, Socket Welding, and Threaded.
  5. DIN (Deutsches Institut für Normung) Standards (European):
    • DIN 2605: Steel Elbows for Butt Welding (elbows dimensions and tolerances).
    • DIN 2615: Tees for Butt Welding.
    • DIN 2616: Reducers for Butt Welding.
    • DIN 2617: Caps for Butt Welding.
  6. EN (European Norms) Standards:
    • EN 10253-1: Butt-Welding Pipe Fittings Made of Non-Alloy and Alloy Steels.
    • EN 10253-2: Butt-Welding Pipe Fittings with Specified Elevated Temperature Properties.
    • EN 10253-3: Butt-Welding Pipe Fittings Made of Austenitic and Austenitic-Ferritic (Duplex) Stainless Steel.
    • EN 10253-4: Butt-Welding Pipe Fittings for Low-Pressure Applications.
  7. JIS (Japanese Industrial Standards):
    • JIS B2311: Steel Pipe Fittings for Butt-Welding.
    • JIS B2312: Cast Iron Pipe Fittings for Butt-Welding.
    • JIS B2313: Malleable Iron Pipe Fittings for Butt-Welding.
  8. ISO (International Standards Organization) Standards:
    • ISO 5251: Specifications for Butt-Welding Ends for Steel Pipe Fittings (compatible with ISO pipes and equipment globally).
    • ISO 15590: Petroleum and Natural Gas Industries — Induction Bends, Fittings, and Flanges for Pipeline Transportation Systems.
  9. BS (British Standards):
    • BS 1640: Steel Butt-Welding Pipe Fittings for the Petroleum Industry.
    • BS 3799: Forged Fittings, Screwed, and Socket-Welding for the Petroleum Industry
Why Ample Alloys for Buttweld Tee!

At Ample Alloys, we are dedicated to providing the highest quality buttweld tees that meet both industry standards and customer requirements.

Superior Quality Assurance

ensures the highest quality standards in manufacturing buttweld tees, delivering products with excellent durability, seamless construction, and precise dimensions.

Advanced Manufacturing Expertise

With state-of-the-art facilities and skilled professionals, we produce buttweld tees tailored to meet diverse industrial requirements.

Wide Range of Customization

We offer buttweld tees in various materials, sizes, and specifications to suit your specific pipeline needs, ensuring a perfect fit for every project.

Timely Delivery Commitments

Our efficient logistics team ensures your buttweld tees are delivered on schedule, keeping your projects on track.

How are buttweld tees installed?

Buttweld tees are welded to the pipe, providing a permanent and leak-proof connection. The tee is aligned with the pipe, and welding is performed around the joint to secure the fitting.

Can buttweld tees handle high-pressure systems?

Yes, buttweld tees are designed to withstand high-pressure environments, especially when manufactured from high-strength materials like carbon steel, stainless steel, and alloy steel.

Are customized buttweld tees available?

Yes, at Ample Alloys, we offer customized buttweld tees tailored to your specific project requirements, including size, material, and design.

Available Types of Buttweld Fittings

ASME B16.9 Elbow

Elbow

45°90°180°1D/1.5D3D5D8D10D
ASME B16.9 Tee

Tee

Equal Tee, Unequal/Reducing Tee
ASME B16.9 Reducer

Reducer

Concentric Reducer, Eccentric Reducer
ASME B16.9 Cross

Cross

Equal Cross, Unequal/Reducing Cross
ASME B16.9 Stub End

Stub End

Long & Short Stub Ends, Lap Joint Stub End
ASME B16.9 End Caps

End Caps

ASME B16.9 Bend

Bend

Long Radius Hot Induction J Mitered Piggable U Welded and Seamless Bends.