Threaded Tee
Threaded Tee Pipe Fittings
A Threaded Tee is a three-way pipe fitting that allows for a 90° branch from the main run. It has three female threaded openings, enabling easy assembly and disassembly of piping without welding. Threaded Tees are widely used in small-diameter piping systems where tight, leak-proof connections are critical.
| Feature | Threaded Tee Description |
|---|---|
| Purpose | Connects three pipes, forming a 90-degree branch to divert or combine flow in a piping system. |
| Standards | ASME B16.11, BS 3799, ISO 4144, ANSI/ASME B1.20.1 (NPT), BSPT, BSPP |
| Size Range | 1/8″ to 4″ (NPS) |
| Pressure Classes | Class 2000, 3000, 6000, 9000 |
| Thread Types | NPT (National Pipe Thread), BSPT (British Standard Pipe Taper), BSPP (British Standard Pipe Parallel), PT, PF |
| Types | – Equal Tee: All three ends have the same diameter. – Reducing Tee: Branch or run ends have different diameters. |
| Materials | – Stainless Steel: ASTM A182 F304, F316, F316L, F321, F347, F904L – Carbon Steel: ASTM A105, A350 LF2 – Alloy Steel: ASTM A182 F5, F9, F11, F22, F91 – Duplex/Super Duplex: ASTM A182 F51, F53, F55 – Copper Alloys: ASTM SB 111 (C10100, C10200, etc.) – Nickel Alloys: Inconel, Monel, Hastelloy – Others: Brass, Malleable Iron, Cast Iron |
| Applications | – Oil & gas, petrochemical, chemical processing, plumbing, HVAC, water supply, power plants – Suitable for small-diameter, high-pressure systems (NPS 2 or smaller) – Used in pipelines requiring branch connections for fluid or gas distribution |
| Connection Types | Threaded (Female/Female, or Female/Female/Male for special configurations) |
| Key Features | – Provides smooth flow distribution or combination – Easy to install and disassemble for maintenance – Corrosion-resistant materials (e.g., stainless steel, brass) for harsh environments – Reducing tees allow connection of different pipe sizes |
| Common Issues | – Pressure losses due to turbulence at the junction – Potential wear with abrasive media – Threaded connections may require proper sealing to prevent leaks |
| Sealing Types | NPT (60° thread angle, tapered), BSPP (parallel threads), BSPT (tapered) |
| Typical Industries | Oil & gas, chemical processing, plumbing, HVAC, marine, agriculture, food & beverage |
Threaded Tee Dimensions
Class 2000
| NPS | Min Length of Thread | Outside Dia of Band D | Center to End A | Min WT | |
| B | J | ||||
| 1/2 | 10.9 | 13.6 | 33 | 28 | 3.18 |
| 3/4 | 12.7 | 13.9 | 38 | 33 | 3.18 |
| 1 | 14.7 | 17.3 | 46 | 38 | 3.68 |
| 1.1/4 | 17 | 18 | 56 | 44 | 3.89 |
| 1.1/2 | 17.8 | 18.4 | 62 | 51 | 4.01 |
| 2 | 19 | 19.2 | 75 | 60 | 4.27 |
| 2.1/2 | 23.6 | 28.9 | 92 | 76 | 5.61 |
| 3 | 25.9 | 30.5 | 109 | 86 | 5.99 |
| 4 | 27.7 | 33 | 146 | 106 | 6.55 |
Class 3000
| NPS | Min Length of Thread | Outside Dia of Band D | Center to End A | Min WT | |
| B | J | ||||
| 1/2 | 10.9 | 13.6 | 38 | 33 | 4.09 |
| 3/4 | 12.7 | 13.9 | 46 | 38 | 4.32 |
| 1 | 14.7 | 17.3 | 56 | 44 | 4.98 |
| 1.1/4 | 17 | 18 | 62 | 51 | 5.28 |
| 1.1/2 | 17.8 | 18.4 | 75 | 60 | 5.56 |
| 2 | 19 | 19.2 | 84 | 64 | 7.14 |
| 2.1/2 | 23.6 | 28.9 | 102 | 83 | 7.65 |
| 3 | 25.9 | 30.5 | 121 | 95 | 8.84 |
| 4 | 27.7 | 33 | 152 | 114 | 11.18 |
Class 6000
| NPS | Min Length of Thread | Outside Dia of Band D | Center to End A | Min WT | |
| B | J | ||||
| 1/2 | 10.9 | 13.6 | 46 | 38 | 8.15 |
| 3/4 | 12.7 | 13.9 | 56 | 44 | 8.53 |
| 1 | 14.7 | 17.3 | 62 | 51 | 9.93 |
| 1.1/4 | 17 | 18 | 75 | 60 | 10.59 |
| 1.1/2 | 17.8 | 18.4 | 84 | 64 | 11.07 |
| 2 | 19 | 19.2 | 102 | 83 | 12.09 |
| 2.1/2 | 23.6 | 28.9 | 121 | 95 | 15.29 |
| 3 | 25.9 | 30.5 | 146 | 106 | 16.64 |
| 4 | 27.7 | 33 | 152 | 114 | 18.67 |
Types of Threaded Tees
Equal Threaded Tee
All three ends are of the same size.
Common in evenly branched pipe systems.
Reducing Threaded Tee
One outlet is smaller than the other two.
Key Features
Connection Type: Female NPT or BSP Threads
Material: Stainless Steel, Carbon Steel, Alloy Steel, Brass, etc.
Pressure Classes: 2000 / 3000 / 6000
Standard Compliance: ASME B16.11, MSS SP-79, BS 3799
Size Range: 1/8” to 4” (DN6 to DN100)
Applications
Oil & gas pipelines
Chemical processing systems
Hydraulic and water supply lines
Firefighting and sprinkler networks