What is a steel tee

What is a steel tee?

The steel tee is a pipe fitting and a pipe joint. Used to change the direction of the fluid, used in the branch pipe of the main pipe.

The three-way is a chemical pipe fitting with three openings, namely one inlet and two outlets; or two inlets and one outlet, having T-shaped and Y-shaped shapes, with equal-diameter nozzles and different diameter nozzles. Three identical or different pipeline collections.

Classification of pipe tees What is an equal tee
What is a reducing tee What is a lateral tee
What is a barred tee What is a forged tee
Production process of pipe tee Factory inspection of pipe tee

Classification of pipe tees

Pipe tees are classified according to pipe diameter

  1. Equre tee (or straight tee): the three-way main pipe with the same pipe diameter
  2. Reducing tee: the tee with smaller pipe diameter than the main pipe diameter

Pipe tees are classified according to the docking form

  1. Butt-welded tee: It is a tee fitting that is welded after the butt joint is connected.
  2. Socket tee: It is a three-way pipe fitting that is welded or welded after the connecting pipe fittings are inserted into the ends of the tee.
  3. Card sleeve type tee: It is the tee fitting which is the ferrule joint at each end and the tube is inserted and then fastened.
  4. Threaded tee: A three-way pipe fitting that connects the pipe fittings in a threaded manner.

Pipe tees can be divided into stainless steel tees, carbon steel tees, copper tees, etc. according to the material classification.

What is an equal tee?

The equal tee is one of the pipe tees. The three pipes of the equal-diameter tee have the same caliber.
Equal-diameter tee is widely used in the construction and maintenance of petrochemical, oil and gas, liquefied petroleum gas, chemical fertilizer, power plant, nuclear power, shipbuilding, papermaking, pharmaceutical, food hygiene, urban construction and other industries. In the industry, the pressure of such pipe fittings is relatively high, the maximum pressure can reach 600 kg, and the water pressure in the living is low, generally 16 kg.
Because the pipe tees can be used in a variety of industries, they can be divided into the following categories by different types:

  1. Divided into carbon steel, cast steel, alloy steel, stainless steel, copper, aluminum alloy, and so on.
  2. Divided by the production method can be divided into top system, pressing, forging, casting and so on.
  3. According to the manufacturing standards, it can be divided into national standard, electric standard, water standard, American standard, German standard, Japanese standard and Russian standard.

The equal tee is the same diameter at both ends, and the method is as follows: For example, the “T3” tee indicates that the outer diameter is a 3-inch equal-diameter tee.
The material of the equal-diameter tee is generally 10# 20# A3 Q235A 20g 20G 16Mn ASTM A234 ASTM A105 ASTM A403, etc.
The outer diameter of the equal-diameter tee ranges from 2.5″ to 60″, and the 26″-60″ is a welded tee. The wall thickness is 28-60mm.

The pressure levels of the equal-diameter tees are Sch5s, Sch10s, Sch10, Sch20, Sch30, Sch40s, STD, Sch40, Sch60, Sch80s, XS; Sch80, Sch100, Sch120, Sch140, Sch160, XXS.

ASME B16.9 Butt weld Equal Tee Dimensions

equal tee dimen - What is a steel tee

Nominal Pipe Size Outside diameter
at bevel
Center-to-End
Run (C) Outlet(M)
1/2″ 21.3 25 25
3/4″ 26.7 29 29
1″ 33.4 38 38
1 1/4″ 42.2 48 48
1 1/2″ 48.3 57 57
2″ 60.3 64 64
2 1/2″ 73.0 76 76
3″ 88.9 86 86
3 1/2″ 101.6 95 95
4″ 114.3 105 105
5″ 141.3 124 124
6″ 168.3 143 143
8″ 219.1 178 178
10″ 273.0 216 216
12″ 323.8 254 254
14″ 355.6 279 279
16″ 406.4 305 305
18″ 457.0 343 343
20″ 508.0 381 381
22″ 559.0 419 419
24″ 610.0 432 432

The dimensions are in millimeters

What is a reducing tee?

The branch pipe is different from the other two diameters called the reducer tee. The same diameter at both ends is called an equal diameter tee. Reducing tee is widely used in the construction and overhaul of petrochemical, oil and gas, liquefied petroleum gas, chemical fertilizer, power plant, nuclear power, shipbuilding, papermaking, pharmaceutical, food hygiene, urban construction and other industries. In the industry, the pressure of such pipe fittings is relatively high, the maximum pressure can reach 600 kg, and the water pressure in the living is low, generally 16 kg.
For the reducer tee, the method is as follows: For example, “T4 x 4 x 3.5” means a reducer with a diameter of 3.5 inches and a diameter of 3.5 inches.
The material of the reducer tee is generally 10# 20# A3 Q235A 20g 20G 16Mn ASTM A234 ASTM A105 ASTMA403, etc.
The outer diameter of the reducer tee ranges from 2.5″ to 60″, and from 26″ to 60″ is the weld tee. The wall thickness is 28-60mm.
The wall thickness of the reducer tee is: Sch5s, Sch10s, Sch10, Sch20, Sch30, Sch40s, STD, Sch40, Sch60, Sch80s, XS; Sch80, Sch100, Sch120, Sch140, Sch160, XXS.
The pipe tees can be used in a variety of industries, and can be divided into the following categories by different types:
1. Divided by the production method can be divided into top system, pressing, forging, casting and so on.

2. According to the manufacturing standards, it can be divided into national standard, electric standard, water standard, American standard, German standard, Japanese standard and Russian standard.

Dimensions and Standards of straight tees and reducing tees

When we talk about a tee NPS 3, a equal or straight tee is intended. With a tee NPS 3 x 2 a reducing tee is intended. Although, officially a reducing tee will be indicated by 3 diameters, namely 3 x 3 x 2 (A x B x C). The A & B measure stands for the Nominal Pipe Size of Run-Pipe, C measure stands for Nominal Pipe Size of Outlet.

This designation actually is superfluous, but comes from the time that tees were available in 3 different ends of diameters, such as
4 x 3 x 2 (A x B x C). In this implementation of course it is necessary, to specify 3 different sizes.

That kind of tees is probably no longer available. Applying a equal tee with a concentric or eccentric reducer is now the usual practice.

A straight or equal buttwelding Tee is available for all common diameters.

A Reducing Tee not, because many diameters are not produced, or can not be produced.

As an example: a reducing tee NPS 6 x 4 is a standard item for most suppliers, but a reducing tee NPS 16 x 2 is probably not available by any supplier.

It would also not economical to use a NPS 16 tee with a NPS 2 outlet; in such situations a Branch Fitting will be used or a Branch Connection will be made.

What is a lateral tee?

A Lateral tee is one kind of tee fittings, which has a 45 degree branch from a pipeline: (45° Lateral Tee). It is a kind of steel pipe tee, but the branch direction is different with the straight tee. On the contrary to the lateral tee,the straight tee has a branch pipe direction of 90 degree to the run pipe.

LATERALS BUTT WELD 45 DEG SCH 40 304 SS 1 - What is a steel tee LATERALS BUTT WELD 45 DEG SCH 40 304 SS 2 - What is a steel tee
LATERALS BUTT WELD 45 DEG SCH 40 304 SS 3 - What is a steel tee LATERALS BUTT WELD 45 DEG SCH 40 304 SS 4 - What is a steel tee

Materials

Carbon steel: ASTM/ASME A234 WPB-WPC
Alloy steel: ASTM/ASME A234 WP 1-WP 12-WP 11-WP 22-WP 5-WP 91-WP 911 
Stainless steel: ASTM/ASME A403 WP 304-304L-304H-304LN-304N

                           ASTM/ASME A403 WP 316-316L-316H-316LN-316N-316Ti 

                           ASTM/ASME A403 WP 321-321H ASTM/ASME A403 WP 347-347H
Low temperature steel: ASTM/ASME A402 WPL 3-WPL 6 
High performance steel: ASTM/ASME A860 WPHY 42-46-52-60-65-70

Size range: 1/2 to 72 inches
Pressure: SCH5 to SCH160

APPLICATIONS OF LATERAL TEES:

lateral tees are widely used in various commercial and industrial applications. Industrial applications include:

  • Chemical processing
  • Petroleum
  • Pulp/paper
  • Refining
  • Textile
  • Waste treatment, Marine
  • Utilities/power generation
  • Industrial equipment
  • Automotive
  • Gas compression and distribution industries
  • Pipe Tees are also recommended for industrial plant fluid power systems.

Type of the lateral pipe fittings:

Lateral pipe fittings have two types: lateral tee and latrolet (also called Lateral Outlet).

The lateral tee’s shape is like a pipe tee, the butt welding lateral tees are made from steel pipes or forgings, the manufacturing standard is ASME B16.9. there are also the forged lateral tee produced refer to ASME B16.11,the ends are socket welding and threaded.

lateral tee size - What is a steel tee

ANSI/ASME B16.11 Forged Steel Lateral Tee dimensions:20171223070935 13848 - What is a steel tee

1/4″ to 4″ class 2000 threaded,1/8″ to 4″ class 3000 threaded,1/8″ to 4 ” class 6000 threaded

Class 2000 1/8 1/4 3/8 1/2 3/4 1 1 1/4 1 1/2 2 2 1/2 3 4
A 7/8 31/32 1 1/8 1 5/16 1 1/2 1 3/4 2 2 3/8 3 3 3/8 4 3/16
B 29/32 1 1/16 1 5/16 1 9/16 1 27/32 2 7/32 2 1/2 3 1/32 3 11/16 4 5/16 5 3/4
Class 3000 1/8 1/4 3/8 1/2 3/4 1 1 1/4 1 1/2 2 2 1/2 3 4
A 7/8 31/32 1 1/8 1 5/16 1 1/2 1 3/4 2 2 3/8 2 1/2 3 1/4 3 3/4 4 1/2
B 29/32 1 1/16 1 5/16 1 9/16 1 27/32 2 7/32 2 1/2 3 1/32 3 11/32 4 4 3/4 6
Class 6000 1/8 1/4 3/8 1/2 3/4 1 1 1/4 1 1/2 2 1/2 3 4
A 31/32 1 1/8 1 5/16 1 1/2 1 3/4 2 2 3/8 2 1/2 3 1/4 3 3/4 4 3/16 4 1/2
B 1 1/6 1 5/16 1 9/16 1 27/32 2 7/32 2 1/2 3 1/32 3 11/32 4 4 3/4 5 3/4 6

The latrolet’s shape likes a pipe outlet,and the ends of the products could be butt welding,socket welding or threaded.The products’ standard is according to MSS-SP97,which is the same with the outlets products.

MSS-SP97 Latrolet Dimensions:

20171223071052 39371 - What is a steel tee

NB Out-let
Size

Dimensions

CL 3000
Threaded
and Socket
Weld
CL 6000
Threaded
and Socket
Weld
Standard
& XS Butt
Weld
Sch. 160
and XXS
Butt Weld
A B C E A B C E A B C E A B C
2 1/2 – 1 1/4 1/4 1 9/16 2 11/32 1 7/16 1 9/16 1 9/16 2 11/32 1 7/16 1 9/16 1 5/16 2 3/32 1 7/16 1 9/16 1 9/16 2 5/16 1 7/16
12 – 3
2 1/2 – 1 1/4 3/8 1 9/16 2 11/32 1 7/16 1 9/16 1 9/16 2 11/32 1 7/16 1 9/16 1 5/16 2 3/32 1 7/16 1 9/16 1 9/16 2 5/16 1 7/16
12 – 3
2 1/2 – 1 1/4 1/2 1 9/16 2 11/32 1 7/16 1 9/16 1
3/8
2 5/32 1 7/16 1 9/16
12 – 3
1 1/2 – 1 1/4
5 – 2 1/2 1 7/8 2
3/4
1 3/4 1 29/32 1 13/16 2
3/4
1 3/4
12 – 6
1 1/2 – 1 1/4
5 – 2 3/4 1 7/8 2
3/4
1 3/4 1 29/32 1 11/16 2 17/32 1
3/4
1 29/32
12 – 6
2 1/2 – 2
5 – 3 3/4 2 3/16 3
1/4
2 1/8 2 3/16 2
1/8
3
1/4
2 1/8
12 – 6
2 1/2 – 2
5 – 3 1 2 3/16 3
1/4
2 1/8 2 3/16 2 1/2 3 21/32 2 5/8 2 15/32 1 31/32 3 2
1/8
2 3/16 2
1/2
3 13/16 2 5/8
12 – 6
2 1/2 – 2
5 – 3 1 1/4 2 1/2 3 27/32 2 5/8 2 15/16 2 3/4 4 7/32 3 1/32 2
5/8
2 9/32 3 19/32 2
5/8
2 15/32 2
3/4
4
1/4
3
12 – 6
2 1/2 – 2
5 – 3 1 1/2 2 3/4 4 7/32 3 1/32 2 15/32 3 31/32 3 1/32 2
5/8
12 – 6
5 – 4
8 – 6 1 1/2 3 3/8 5 7/16 4 1/8 3 5/32 3
3/8
5
3/8
4 1/8
12 – 10
5 – 4
8 – 6 2 3 3/8 5 7/16 4 1/8 3 5/32 3 3/8 5 7/16 4 1/8 3 5/32 3 3/16 5
1/4
4
1/8
3 13/32
12 – 10
5 – 4
8 – 6 2 1/2 3 5/32 5 3/16 4
1/8
3 5/32
12 – 10
Order to
Spe-cific Run
Pipe Sizes
3 3 13/16 6
1/4
4 31/32 3 25/32
Order to
Spe-cific Run
Pipe Sizes
4 4
3/4
7 13/16 6 7/16 4 9/16

What is a barred tee?

A barred tee is a tee or any fitting with a branch used in pipelines that is pigged and has a restriction bar welded internally preventing the pig from traveling down a branch connection.

barred tee2 - What is a steel tee 
Barred Tee for long distance submarine oil and gas pipeline.
Data pipe barred tee - What is a steel tee

Datasheet of a pipe barred tee

Barred tees are pipe fittings with two outlets, one at 90 ° to the connection to the main line that has tiny holes. Barred tees can either be extruded or fabricated and are used to connect two pieces of pipe or fittings. Barred tee is used in pipelines that are pigged.

Applications of pipe tees:

Pipe Tees are widely used in various commercial and industrial applications. Industrial applications include:

  • Chemical processing
  • Petroleum
  • Pulp/paper
  • Refining
  • Textile
  • Waste treatment, Marine
  • Utilities/power generation
  • Industrial equipment
  • Automotive
  • Gas compression and distribution industries
  • Pipe Tees are also recommended for industrial plant fluid power systems.

What is a forged tee?

Forged Tee Fittings are pipe fittings that be formed mainly by forging.

forged tee fitting - What is a steel tee

Socket Welding Tees (Forged High Pressure Pipe Fittings)

forged tee - What is a steel tee

We have a team of experienced professionals with years of experience in manufacturing.

Socket-weld or threaded (npt or pt type. )

Pressure: 2000LBS, 3000LBS, 6000LBS, 9000LBS

Size: from 1/4″ to 4″ (6mm-100mm)

Material: ASTM A105, F304, F316, F304L, F316L, A182 F11/F22/F91

Connection ends: butt welded, threaded

Rating:

1. Threaded wog: 2000, 3000 and 6000 lbs (140kgs/cm2-210kgs/cm2-410kgs/cm2)( sch 40 – sch 80 – sch 160 ).

2. Socket-welding wog: 3000, 6000, 9000 lbs. ( sch 80 – sch 160 – xxs ).

Specification:

1. Dim. Spec: Asme b 16.11-1996 (rivision of ansi b16.11-1991), mss-sp-79\ 83\ 95\97 and gb/t 7306, 12716, 14383, 14626, spec. 
2. Material spec: Astm a105, astm a182(f304, f304l, f316, f316l, f304h, f316h, f317l, f321, f11, f22, f91), gb/t 699 20mn. 
3. Size of raw material: Dia. 19-85mm round bar.

Finish:

Galvanized or black. (carbon), pickled(stainless).

Production process of pipe tee

Hydraulic bulging
The hydraulic bulging of the tee is a forming process in which the branch pipe is expanded by the axial compensation of the metal material. The process is to use a special hydraulic machine to inject liquid into the tube blank with the same diameter of pipe tee, and to simultaneously press the two horizontal side cylinders of the hydraulic machine to press the tube blank, the volume of the tube blank becomes smaller, and the tube blank is compressed. The liquid becomes smaller as the volume of the tube blank becomes smaller, and when the pressure required for the expansion of pipe tee branch pipe is reached, the metal material flows along the cavity of the mold under the double action of the liquid pressure in the side cylinder and the tube blank to swell out of the branch pipe.
pipe tee hydraulic bulging process can be formed at one time, and the production efficiency is high; the main pipe and shoulder wall thickness of pipe tee are increased.
Due to the large tonnage of the equipment required for the hydraulic bulging process of the seamless tee, it is currently mainly used for the manufacture of standard wall thickness tees smaller than DN400. The suitable forming materials are low carbon steel, low alloy steel and stainless steel with relatively low cold work hardening tendency, including some nonferrous metal materials such as copper, aluminum and titanium.
Hot press forming
Pipe tee hot press forming is a process in which a tube blank having a diameter larger than a Pipe tee diameter is flattened to a diameter of a tee.
a hole is opened in the portion of the stretching branch pipe; the tube blank is heated, placed in a forming mold, and a die of the stretching branch pipe is loaded into the tube blank; under the action of the pressure, the tube blank is radially compressed and compressed in the radial direction. During the process, the metal flows toward the branch pipe and forms a branch pipe under the drawing of the die. The entire process is formed by the radial compression of the tube blank and the stretching process of the branch portion. Different from the hydraulic bulging tee, the metal of the hot-pressed Pipe tee branch pipe is compensated by the radial movement of the tube blank, so it is also called the radial compensation process.
Due to the use of heated tees, the tonnage of the equipment required for material forming is reduced. The hot press tee has wide adaptability to materials, and is suitable for materials of low carbon steel, alloy steel and stainless steel; especially for tees with large diameter and thick wall, this forming process is usually adopted.
Reasons and solutions for the deviation of the angle of pipe tees during the manufacturing process
(1) The pipe tee is prone to angular offset, the surface is not flat, the diagonal of the nozzle is not equal, and the bite is not strict. The main reasons for this are:

  • 1) The straight angle of the inner and outer arcs is not accurate. The thickness of the material itself is not considered. After the finished product is formed, the phenomenon that the outer arc piece is short and the inner arc piece is long is formed, which affects the angle.
  • 2) Two planes with curved lines are ruled.
  • 3) Small holes appear in the outer corner of pipe tee outer arc.
  • 4) The width of the joint angle bite is not equal, and the force at the bite is uneven.

(2) The main prevention methods are:

  • 1) Find the material with a corrected square. The pipe tee is unfolded with the dimensions R1 and R2, and the width should be increased by the margin of the hem to prevent the pipe tee from being installed improperly.
  • The lengths of the back and inside of the elbow are 1.57R1 and 1.57R2, respectively. The accuracy of the arc should be guaranteed.
  • 2) After the two large pieces are unrolled, the ends of the sheets should be strictly angled. The two flat sheets with curvature are overlapped, and the shape coincidence error is checked and the deviation is allowed.
  • Adjustment.
  • 3) Small holes appearing in the outer arc corner of pipe tee, and can be repaired by soldering for the stainless steel plate.
  • 4) When making a manual bite, make sure the width is appropriate, ensure the size of the tee, and ensure that the force is even when the mouth is bitten.

Factory inspection of pipe tee

The chemical composition of pipe tees shall be checked and accepted according to the material list. If there are special requirements, the re-inspection may be carried out according to the standard requirements. The arbitration backwashing method is in accordance with the relevant standards.
The surface of the tee should be free of cracks, pores, undercuts, slag inclusions, and the inside and outside must be smooth. There should be no scratches, negative pits and straightening defects that are beyond the tolerance of the wall thickness of the steel pipe. The fracture should be free of burrs. The appearance inspection of the pipe tee is visually inspected under good daylight illumination (a 5x magnifying glass is available).
In terms of size, the dimensional inspection of the tee is measured with a measuring instrument of corresponding accuracy.
Appearance test: pipe tees shall be submitted for acceptance in batches. Each batch shall consist of pipe fittings of the same grade, the same size and the same process. The number of pipe tees of each batch shall not exceed a certain requirement; 400 shall be 400 for nominal pass or less. Root; 200 of the nominal passages greater than 25mm.

Source: China Pipe Tee Manufacturer – Yaang Pipe Industry Co., Limited (www.steeljrv.com)

(Yaang Pipe Industry is a leading manufacturer and supplier of nickel alloy and stainless steel products, including Super Duplex Stainless Steel Flanges, Stainless Steel Flanges, Stainless Steel Pipe Fittings, Stainless Steel Pipe. Yaang products are widely used in Shipbuilding, Nuclear power, Marine engineering, Petroleum, Chemical, Mining, Sewage treatment, Natural gas and Pressure vessels and other industries.)

If you want to have more information about the article or you want to share your opinion with us, contact us at sales@steeljrv.com

Please notice that you might be interested in the other technical articles we’ve published:

  • What is the difference between lateral tee and True WYE

  • What is a Pipe Tee

  • How to get high quality pipe tees

References:

  • https://www.yaang.com

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