ASME B16.9 | Equal / Straight Tees | Butt-Welding Pipe Fittings | Carbon Steel, Stainless Steel, Duplex, Alloy & Nickel Alloys
Elite Buttweld Equal Tees, also known as Straight Tees, are factory-made pipe fittings used to create a 90° branch connection from the main pipeline. An equal tee has the same nominal pipe size at the run and branch outlets, providing a full-size branch connection for process and utility piping systems.
Elite supplies seamless, welded and fabricated Equal Tees in a wide range of carbon steel, stainless steel, duplex, alloy steel, nickel alloy and other materials. Standard dimensions are manufactured in accordance with ASME B16.9, with special sizes and configurations available according to project requirements.
| Parameter | Specification |
|---|---|
| Manufacturer | Elite |
| Product | Buttweld Equal Tee / Straight Tee |
| Primary Standard | ASME B16.9 |
| Configuration | Equal Tee |
| Run Size | Same as Branch Size |
| Branch Angle | 90° |
| Size Range | NPS 1/2"–48" |
| Construction | Seamless / Welded / Fabricated |
| End Connection | Butt Weld |
| Wall Thickness | SCH 5S, 10S, 20, 40S, STD, 80S, XS, 100, 120, 140, 160, XXS and custom |
| Dimensions | ASME B16.9 where applicable |
| End Preparation | ASME B16.25 where applicable |
| Material Standards | ASTM / ASME applicable specifications |
| Heat Treatment | According to material and applicable specification |
| Surface Finish | Pickled / Blasted / Polished / Coated / Project Specified |
| Inspection | Visual, dimensional, PMI, UT, RT, MT, PT, hardness and other NDE as specified |
| Documentation | MTC, EN 10204 3.1/3.2, inspection reports and project documentation |
| Configuration | Description | |
|---|---|---|
| Equal Tee | Run and branch have the same nominal size | |
| Seamless Equal Tee | Seamless construction for applicable sizes/materials | |
| Welded Equal Tee | Welded construction for selected sizes/materials | |
| Fabricated Equal Tee | Custom large-diameter or special construction | |
| Barred Tee | Special internal configuration for project-specific requirements | |
| Note: A Reducing Tee is a different product, with a smaller branch size than the run. A Lateral Tee has an angled branch and should be listed separately from a standard Equal Tee. | ||
ASME B16.9
Primary dimensional standard for factory-made wrought buttwelding fittings, including Equal Tees.
ASME B16.25
Butt-welding end preparation.
ASTM / ASME Material Specifications
Applicable material standards according to the selected material and grade.
ASME B31.3 / B31.1
Process and power piping requirements, where applicable.
NACE MR0175 / ISO 15156
For sour-service applications when specifically required by the project.
ASME Section II
Material requirements where applicable to pressure equipment and project specifications.
Note: ASME B16.28 should not be listed as the primary standard for Equal Tees. Equal Tees are covered by the current ASME B16.9 standard.
Carbon Steel
ASTM A234 WPB, WPC and applicable WPHY grades including WPHY 42, WPHY 46, WPHY 52, WPHY 60, WPHY 65 and WPHY 70.
Low Temperature Carbon Steel
ASTM A420 WPL3, WPL6 and other applicable grades.
Stainless Steel
ASTM A403 WP304/304L, WP316/316L, WP321/321H, WP347/347H and other applicable grades.
Duplex & Super Duplex
ASTM A815 grades including UNS S31803, S32205, S32750 and S32760.
Alloy Steel
ASTM A234 WP1, WP5, WP9, WP11, WP12, WP22 and WP91.
Nickel Alloys
ASTM B366 and applicable specifications for Nickel 200/201, Monel 400/K500, Inconel 600/601/625/800/825, Hastelloy C276 and Alloy 20.
Copper-Nickel Alloys
Applicable Cu-Ni grades including UNS C70600 and C71500.
Titanium
Applicable titanium grades manufactured to the relevant ASTM specification, including ASTM B363 where applicable.
Material selection is based on operating pressure, temperature, process fluid, corrosion conditions, mechanical requirements and applicable project specifications.
Standard Equal Tee
Run and branch outlets have the same nominal pipe size.
Seamless Equal Tee
Manufactured from seamless pipe or billet for applicable sizes, materials and wall thicknesses.
Welded Equal Tee
Welded construction for selected sizes and materials where permitted by the applicable specification.
Fabricated Equal Tee
Custom-fabricated for large diameters, special wall thicknesses and project-specific configurations.
Barred Equal Tee
Special reinforced or internally barred configuration used where flow or pigging requirements require internal control. Manufactured according to project requirements rather than treated as a standard B16.9 Equal Tee configuration.
Design Features
Standard Equal Tee dimensions are manufactured in accordance with ASME B16.9, where applicable.
Available wall thicknesses include:
SCH 5S, 10S, 20, 40S, STD, 80S, XS, 100, 120, 140, 160 and XXS, together with project-specific wall thicknesses.
Dimensional requirements include:
For non-standard large-diameter or fabricated Equal Tees, dimensions can be manufactured according to approved engineering drawings.
Elite Equal Tees are manufactured using suitable forming, welding and fabrication processes according to material, size and project requirements.
Quality control can include:
Elite can manufacture Equal Tees according to customer drawings, piping isometrics and project specifications, including:
Depending on project requirements, supply can include:
Elite Buttweld Equal Tees are used in:
Equal Tees are particularly suitable for piping systems requiring a full-size 90° branch connection from the main pipeline.
When ordering Buttweld Equal Tees, please specify:
| Item | Required Information |
| Product | Buttweld Equal Tee |
| Size | NPS Run × Branch Size |
| Configuration | Equal Tee / Barred / Fabricated |
| Material & Grade | ASTM / ASME specified grade |
| Wall Thickness | Schedule or actual thickness |
| Construction | Seamless / Welded / Fabricated |
| Standard | ASME B16.9 or project specified |
| End Preparation | ASME B16.25 or project specified |
| Surface Finish | Standard / Pickled / Blasted / Polished / Coated |
| Inspection | PMI / UT / RT / MT / PT / Hardness etc. |
| Documentation | EN 10204 3.1 / 3.2 and project documents |
| Quantity | Required quantity |
| Special Requirements | Drawing, coating, NACE, testing or other project requirements |
Typical Order Example:
6″ × 6″ Equal Tee, ASME B16.9, ASTM A234 WPB, SCH 40, Seamless, ASME B16.25 Bevel Ends, EN 10204 3.1, PMI.
