Pipe Tee (ASME B16.9)
Buttweld equal tees and reducing tees to ASME B16.9. NPS ½"–48", all schedules. Available in carbon steel, stainless, alloy, and duplex grades.
Specifications
| Parameter | Value |
|---|---|
| Standard | ASME B16.9 |
| Types | Equal tee, Reducing tee (run × run × branch) |
| Size range | NPS ½" to 48" |
| Wall thickness | Per ASME B36.10M / B36.19M schedule |
| End preparation | Beveled ends per ASME B16.25 |
| Tolerances | Per ASME B16.9 Table 6 (end-to-center, outside diameter) |
Materials
Carbon Steel
A234 WPB, WPC
Stainless Steel
A403 WP304/L, WP316/L, WP321
Alloy Steel
A234 WP11, WP22, WP91
Duplex
F51, F53 — sour service and offshore
Applications
- →Distribution manifolds in process plants — branching main headers to equipment
- →Utility headers (steam, CW, process water) where spur connections are required
- →Firewater loops and pressure relief routing
- →Subsea pipelines — reducing tees for riser and PLET connections
Calculate Tee Weight
Select run size, branch size, schedule, and material for ASME B16.9-compliant weight calculation.
FAQ
What is an equal tee vs a reducing tee?
An equal tee has all three openings at the same nominal size (e.g., 6" × 6" × 6"). A reducing tee has a smaller branch outlet — for example, 6" × 6" × 4" means the two run openings are 6" and the branch outlet is 4". Reducing tees are specified when the branch flow is smaller than the main run.
How is a pipe tee weight calculated?
A buttweld tee weight is calculated by modeling the run barrel (two ends at run NPS) and the branch reinforcement (outlet at branch NPS) as geometric solids, then computing volume × material density. Our tee weight calculator does this using ASME B16.9 center-to-end dimensions for your selected NPS, schedule, and material.
What is the minimum wall thickness of a reducing tee?
ASME B16.9 requires the minimum wall thickness of finished fittings to be not less than 87.5% of the specified schedule wall thickness (same as the connected pipe). The actual wall at the branch crotch is typically thicker due to the forming process.