Tee is also called pipe fitting tee or tee fitting or tee joint. The pipe fitting tee can change the fluid direction and branch out of the main pipeline. Usually, we can classify all tees according to the pipe diameter. The primary raw material includes malleable iron tee, ductile iron tee, carbon steel tee, cast steel tee, alloy steel tee, stainless steel tee, copper tee, aluminium alloy tee, plastic tee, argon tee, asphalt tee, PVC tee and other materials.
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The diameter is different from that of the other two branches. It is a reducing tee. Another reducing tee, the diameters of the three ports are different, also called reducing tee. The diameter of the branch pipe becomes smaller, which can increase the medium pressure of the branch pipe.
Welded Reducing Tee: Reducing welded Tee for applications that require a change in pipe diameter in a piping system to maintain a stable connection.
Flange Reducing Tee: Reducing flange tee for flanged connections where different diameters of pipes need to be connected in a piping system.
Threaded Reducing Tee: Reducing threaded tees, which are suitable for small- to medium-sized piping systems, offers the option of connecting different pipe diameters.
These classifications are selected based on specific needs and characteristics of the piping system. For example, welded types are suitable for high-pressure, high-temperature environments, while flanged connections are suitable for applications that require frequent removal and replacement. Threaded connections, on the other hand, are more suitable for small to medium-sized, low-pressure piping systems. Reducing Tee is usually used when there is a need to change the direction of fluid flow or pipe diameter in the pipeline to meet the requirements of system design and operation.
The diameter is the same as that of the other two branch pipes. It is an equal tee.
Welded Equal Tee: Connected by welding, suitable for applications requiring a stable connection and high strength, such as high-pressure and high-temperature environments.
Flanged Equal Tee: With a flanged connection, it is suitable for applications where frequent disassembly is required, providing more flexible installation and maintenance options.
Threaded Equal Tee: Easy to install with a threaded connection, suitable for small to medium-sized piping systems, no welding required.
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Construction and maintenance of projects in the petrochemical industry, petroleum and natural gas, liquefied gas, chemical fertilizer, power plant, nuclear power, shipbuilding, papermaking, pharmacy, food hygiene, urban construction, and other industries of these projects have pipeline demands about the reducing tees and equal tee.
It is the application of TEE in the gas pipeline.
As a partner of China Gas Group, Jianzhi casting group is a significant supplier of gas pipelines in China. And is a member of the China Gas Association. If you have relevant requirements for gas pipeline equal tee and reducing tee, you are welcome to inquire.
Steel tee is a T-shaped pipe fittings that has three branches, normally has two forms with Equal Tee and Reducing Tee (Tee reducer), both are used to divide (combine) the pipelines to adjust the flow rate and change the direction.
Steel pipe tee has been be widely used in different industries, according to material types there are:
Stainless steel tee
Carbon steel tee
Alloy steel tee
According to connecting types, there are:
Butt weld tee
Socket weld tee
Threaded tee
As far as we know, steel tee has many types, then how much do you know about above each type of tee? How to distinguish them and select the best one you need?
Below we will explain with more specifications.
Steel Equal Tee pipe fittings: The three branches of tee have same diameters.
Steel Reducing Tee / Reducer tee pipe fittings: The branch diameter is smaller than the main line diameter. Tee reducer is usually described as NPS diameters in 4” x 4” x 3”, 4” is the main line pipe diameter, and 3” is the reducing branch.
Reducing tee is used more than equal tee since it has more functions and available for more environments.
Ends in plain or beveled, connected by butt welding process. It could bear higher pressure than the other connection types. Butt weld tee dimensions shall be specified in pipe NPS (DN) and thickness in schedule, where socket weld tee or threaded tee thickness specified in pressure class ratings.
Like the other socket pipe fittings, it has a ladder shaped area, so to insert the pipe into the tee branches then welding together. It usually used for small diameter tubing systems.
Based on SW tee forms, the branch end will be threaded to male or female. So there are male branch tee and female branch tee, which if the tube with male NPT threads, then the tee shall be with female NPT threads.
Stainless steel tee used a lot in chemical, sanitary or food industries.It’s advantage is suitable for different working environments and good corrosion resistance.
Standards: ASTM A403 (For wrought Austenitic stainless steel tee pipe fittings), ASTM A270 (For seamless and welded Austenitic and Ferritic stainless steel sanitary tubing tee)
Grades: TP 304, 304L, 316, 316L, 310, 317 and 321.
Carbon steel tee material: ASTM A234 WPB, WPC; MSS SP-75 WPHY-42, WPHY-46, WPHY-52, WPHY-56, 60, 65 and 70. ASME/ANSI B16.9 for BW tee fittings, ASME/ANSI B16.11 for socket weld and threaded tee fittings.
Alloy steel material: ASTM A234 WP1, WP5, WP9, WP11, WP22, WP91
By the cladding technology to clad stainless or alloy steel material in the inner surface of carbon steel tee, is another good option to reach a certain corrosion resistance and lower the material cost.
The common manufacturing process to make tees are cold extrusion and hot pushing. Cold extrusion normally for smaller thickness tee, where hot pushing is for large thickness. In case you need an big diameter tee above 24”, welding shall be adopted instead extrusion.
The key process to manufacture steel tee is to use the hydraulic machine to squeeze the mother pipe in a tee mould (or a reducing tee mould), under the big pressure on both pipe ends, the third branch of the tee will be extruded out. The mother pipe could be a seamless or a welded pipe, the same pipe diameter will produce the same diameter tee, means to make a 8 inch steel tee will need a 8 inch pipe. But after the extrusion, the pipe thickness will be become larger, so the tee thickness is larger than the mother pipe thickness.
For butt weld tee, dimensions ranges in 1/2”, 1”, 1 1/2”, 2′, 3”, 4”, 6”, 8”, 10”, 12”, 14”, 16”, 24” and up to 48” (From DN 15 to DN 1200). Thickness class ranges from SCH 10, SCH 20, SCH 40, SCH STD, SCH 80, SCH XS to SCH 160.
For socket weld tee and threaded tee dimensions ranges from 3/8”, 1/2”. 3/4”, 1” and up to 4” (From DN 10 to DN 100). Pressure ratings in 2000#, 3000#, 6000# and 9000#.
• Oil and gas transmissions
• Petroleum and Oil refining
• Water treatment systems
• Chemical Industries
• Sanitary tubing
• Power stations
• Machines and equipment
• Heat exchanger
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