Pipe Tees
NUMET ALLOYS manufactures heavy-duty pipe tees designed to securely divide, combine, or redirect fluid flow in industrial pipelines. Available in Equal (Straight) and Reducing configurations, our tees are forged using advanced extrusion methods to maximize structural integrity and ensure seamless distribution across high-pressure networks.
Detailed Technical Specifications
Reducing Tee: Branch diameter is smaller than run diameter
Specialty: Barred Tees, Lateral Tees (45°), Y-Tees
Stainless Steel: ASTM A403 WP304/304L, WP316/316L, WP321, WP347
Alloy Steel: ASTM A234 WP1, WP5, WP9, WP11, WP22, WP91
Welded (ERW/SAW): 24" NB to 48" NB (100% Radiography Tested)
Dimensions (ASME B16.9)
Centre-to-end dimensions are fixed by the standard and do not change with wall thickness or schedule. On a straight tee all three ends are the same size, so the run dimension C and the outlet dimension M are equal.
Straight (Equal) Tees — Centre-to-End C and M
ASME B16.9| SizeNPS | Outside Dia.mm | Outside Dia.inch | Run C = Outlet Mmm | Run C = Outlet Minch |
|---|---|---|---|---|
| 1/2 | 21.3 | 0.840 | 25 | 1.00 |
| 3/4 | 26.7 | 1.050 | 29 | 1.12 |
| 1 | 33.4 | 1.315 | 38 | 1.50 |
| 1-1/4 | 42.2 | 1.660 | 48 | 1.88 |
| 1-1/2 | 48.3 | 1.900 | 57 | 2.25 |
| 2 | 60.3 | 2.375 | 64 | 2.50 |
| 2-1/2 | 73.0 | 2.875 | 76 | 3.00 |
| 3 | 88.9 | 3.500 | 86 | 3.38 |
| 3-1/2 | 101.6 | 4.000 | 95 | 3.75 |
| 4 | 114.3 | 4.500 | 105 | 4.12 |
| 5 | 141.3 | 5.563 | 124 | 4.88 |
| 6 | 168.3 | 6.625 | 143 | 5.62 |
| 8 | 219.1 | 8.625 | 178 | 7.00 |
| 10 | 273.1 | 10.750 | 216 | 8.50 |
| 12 | 323.9 | 12.750 | 254 | 10.00 |
| 14 | 355.6 | 14.000 | 279 | 11.00 |
| 16 | 406.4 | 16.000 | 305 | 12.00 |
| 18 | 457.2 | 18.000 | 343 | 13.50 |
| 20 | 508.0 | 20.000 | 381 | 15.00 |
| 22 | 558.8 | 22.000 | 419 | 16.50 |
| 24 | 609.6 | 24.000 | 432 | 17.00 |
Wall thickness is not fixed by ASME B16.9 — it is specified by the purchaser and must be at least 87.5% of the nominal wall at any point.
Reducing Outlet Tees — Run C and Outlet M
ASME B16.9| Sizerun × outlet | Run Cmm | Outlet Mmm |
|---|---|---|
| 3/4 × 1/2 | 29 | 29 |
| 1 × 1/2 | 38 | 38 |
| 1 × 3/4 | 38 | 38 |
| 1-1/4 × 1/2 | 48 | 48 |
| 1-1/4 × 3/4 | 48 | 48 |
| 1-1/4 × 1 | 48 | 48 |
| 1-1/2 × 1/2 | 57 | 57 |
| 1-1/2 × 3/4 | 57 | 57 |
| 1-1/2 × 1 | 57 | 57 |
| 1-1/2 × 1-1/4 | 57 | 57 |
| 2 × 3/4 | 64 | 44 |
| 2 × 1 | 64 | 51 |
| 2 × 1-1/4 | 64 | 57 |
| 2 × 1-1/2 | 64 | 60 |
| 2-1/2 × 1-1/4 | 76 | 57 |
| 2-1/2 × 1-1/2 | 76 | 64 |
| 2-1/2 × 2 | 76 | 70 |
| 3 × 1-1/4 | 86 | 70 |
| 3 × 1-1/2 | 86 | 73 |
| 3 × 2 | 86 | 76 |
| 3 × 2-1/2 | 86 | 83 |
| 3-1/2 × 1-1/2 | 95 | 79 |
| 3-1/2 × 2 | 95 | 83 |
| 3-1/2 × 2-1/2 | 95 | 89 |
| 3-1/2 × 3 | 95 | 92 |
| 4 × 1-1/2 | 105 | 86 |
| 4 × 2 | 105 | 89 |
| 4 × 2-1/2 | 105 | 95 |
| 4 × 3 | 105 | 98 |
| 4 × 3-1/2 | 105 | 102 |
| 5 × 2 | 124 | 105 |
| 5 × 2-1/2 | 124 | 108 |
| 5 × 3 | 124 | 111 |
| 5 × 3-1/2 | 124 | 114 |
| 5 × 4 | 124 | 117 |
| 6 × 2-1/2 | 143 | 121 |
| 6 × 3 | 143 | 124 |
| 6 × 3-1/2 | 143 | 127 |
| 6 × 4 | 143 | 130 |
| 6 × 5 | 143 | 137 |
| 8 × 3-1/2 | 178 | 152 |
| 8 × 4 | 178 | 156 |
| 8 × 5 | 178 | 162 |
| 8 × 6 | 178 | 168 |
| 10 × 4 | 216 | 184 |
| 10 × 5 | 216 | 191 |
| 10 × 6 | 216 | 194 |
| 10 × 8 | 216 | 203 |
| 12 × 5 | 254 | 216 |
| 12 × 6 | 254 | 219 |
| 12 × 8 | 254 | 229 |
| 12 × 10 | 254 | 241 |
| 14 × 6 | 279 | 238 |
| 14 × 8 | 279 | 248 |
| 14 × 10 | 279 | 257 |
| 14 × 12 | 279 | 270 |
| 16 × 6 | 305 | 264 |
| 16 × 8 | 305 | 273 |
| 16 × 10 | 305 | 283 |
| 16 × 12 | 305 | 295 |
| 16 × 14 | 305 | 305 |
| 18 × 8 | 343 | 298 |
| 18 × 10 | 343 | 308 |
| 18 × 12 | 343 | 321 |
| 18 × 14 | 343 | 330 |
| 18 × 16 | 343 | 330 |
| 20 × 8 | 381 | 324 |
| 20 × 10 | 381 | 333 |
| 20 × 12 | 381 | 346 |
| 20 × 14 | 381 | 356 |
| 20 × 16 | 381 | 356 |
| 20 × 18 | 381 | 368 |
| 22 × 10 | 419 | 359 |
| 22 × 12 | 419 | 371 |
| 22 × 14 | 419 | 381 |
| 22 × 16 | 419 | 381 |
| 22 × 18 | 419 | 394 |
| 22 × 20 | 419 | 406 |
| 24 × 10 | 432 | 384 |
| 24 × 12 | 432 | 397 |
| 24 × 14 | 432 | 406 |
| 24 × 16 | 432 | 406 |
| 24 × 18 | 432 | 419 |
| 24 × 20 | 432 | 432 |
| 24 × 22 | 432 | 432 |
How to read a reducing fitting: the run dimension C is the same as a straight fitting of the run size and does not change with the outlet. The outlet dimension M is tabulated for each run and outlet combination — it is not half of C and it cannot be interpolated, so always read it from the table. Sizes are called out run × run × outlet. Values are given in millimetres, the primary units of the standard.
Dimensions are nominal values from the referenced standard and are shown for reference only; tolerances apply as specified in the standard. Sizes above 24" NB and non-standard combinations are manufactured to order. For certified drawings against your line list, contact our technical team.
Core Advantages
Branch Flow Optimization
Engineered with smooth, contoured intersections to minimize turbulence, pressure loss, and cavitation when dividing or mixing flow.
Extrusion Integrity
Manufactured using advanced cold-bulge or hot-extrusion methods to ensure uniform grain structure and eliminate weak points at the branch connection.
High-Stress Tolerance
Reinforced crotch thickness provides exceptional resistance to internal pressure, pipeline vibrations, and thermal fatigue in severe service conditions.