What is the difference between lateral tee and True WYE?

Sometimes the angle between the pipe and the main pipe is not 90 degrees, it may be 45° or other degrees, then we should use a lateral pipe fitting to design it. 

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.

20171223070251 83030 - What is the difference between lateral tee and True WYE?

ANSI/ASME B16.11 Forged Steel Lateral Tee dimensions:20171223070935 13848 - What is the difference between lateral tee and True WYE?

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 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 the difference between lateral tee and True WYE?

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 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.  

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.

What are True WYES?

Pipe wyes are used to to allow one pipe to join another pipe at some degree or angle. As the name suggests, the pipe wyes are Y-shaped pipe fitting devices. They are a popular type of pipe fitting used in various industrial applications.

Pipe wyes and pipe tees:
Pipe wyes are similar to pipe tees. The only difference is in that the branch line is angled to reduce friction which could hamper the flow. The pipe connection is typically at a 45-degree angle rather than a usual 90-degree angle. If a branch turns out at the end to be perpendicular to the through line, the pipe fitting becomes a “tee wye”.

Materials used:
There are various materials used in the making of wyes. They are as follows:
  • Carbon steel
  • Stainless steel
  • Iron
  • Copper
  • Monel
  • Nickel
  • Titanium
  • Zirconium
  • Plastic
  • Rubber etc.

Buying Tips

Certain factors that are to be considered for the purchase of pipe wyes are as follows:

  • Pipe and Tube Sizes
  • Wall Thickness
  • Materials
  • Degree of Branch: 30, 45, and 60
  • Finishing
  • Durability
  • Corrosion resistant

The price of amazon’s pipe wyes are very high

Various shapes of pipe wyes:
The pipe wyes (in the form of Y) can take various shapes. Below we give a diagrammatic representation of some pipe wyes.

20171223071323 85923 - What is the difference between lateral tee and True WYE?

Standard Pipe Wye

20171223071346 80608 - What is the difference between lateral tee and True WYE?

Compact Pipe Wye

20171223071409 85042 - What is the difference between lateral tee and True WYE?

Special Pipe Wye

As seen in the above figures, the first one is a standard pipe wye, exactly in the shape of the alphabet “Y” in a horizontal position.

20171223071522 43820 - What is the difference between lateral tee and True WYE?

The second is a pipe wye in a vertical position with three branches. The third one is a special type of pipe wye in the shape of a standard tee with a 45° bend and particularly recommended to be used in large-diameter piping.

Types of pipe wyes:
Let us get to know more about pipe wyes under the following categories:

Reducing Wyes

A Reducing Wye is used in connecting a reducing branch line into a horizontal drain pipe. This is another popular variant of pipe wye and considered to be a popular type of pipe and tube fitting used in various applications.

A reducing wye is also known as “Y-bend”. It has three female openings, in which two are straight in a line and the third bend is at a 45 degree angle. The two straight openings are of the same size and the third Y opening is of a different size.

Material used:
  • Carbon steel
  • Stainless steel
  • Iron
  • Copper
  • Nickel
  • Titanium
  • Zirconium
  • Rubber
  • Plastic
  • Aluminum etc.

Buying tips

Features and specifications:

  • Standards
  • Wall Thickness
  • Long service life
  • Corrosion resistance
  • Good impact strength
  • Light weight and easy to installation
  • Size
  • Colors
  • Finish

Some popular types of reducing wye:20171223071937 17776 - What is the difference between lateral tee and True WYE?

Reducing Single Wye

  • Reducing Double Wye
  • Reducing Long turn Wye
  • Reducing Double Long turn Wye

Uses of reducing wyes:

  • Join pipes of different sizes
  • Withstand acids, bases, and solvents
  • No interruption of flow path
  • Can withstand intermittent corrosive fluids in very high temperatures

Standard Wyes

A standard wye is one of the most popular category of pipe fitting. The name implies that the device is “Y” shaped. The standard pipe wye is a pipe fitting with three openings and is used to create branch lines. It allows one pipe to be joined to another at a 45 degree angle.

A standard wye has branch which allows to split a branch line equally in two directions. The opening sizes of the branch lines can vary depending on different situations. Standard wyes are made of various materials and come in different sizes.

20171223071709 69270 - What is the difference between lateral tee and True WYE?

Materials used:
Materials used are as follows:
  • Aluminum
  • Bronze
  • Brass
  • Carbon steel
  • Ceramic
  • Concrete
  • Rubber
  • Plastic
  • Alloy steel
  • Stainless steel
  • Titanium
  • Zirconium

Buyer’s guide

For bulk purchase of standard wyes, the buyers should be aware of some specifications and features which are given below:

  • Size
  • Dimension
  • Standard
  • Materials of constructions
  • Wall thickness
  • High pressure rated
  • Corrosion resistance
  • Durability
  • Easy to install

20171223071828 80598 - What is the difference between lateral tee and True WYE?

How to measure standard wyes?

To get the accurate measurement of standard wyes, calculate the dimensions of T, T1, M, N, P.

Uses of standard wyes:
Uses of standard wyes are as follows:

  • Join pipes of different sizes.
  • No interruption of flow path.
  • Withstand acids, bases, and solvents.
  • Withstand intermittent corrosive fluids in very high temperatures.

What is the difference between lateral tee and True WYE?

the lateral tee divide two branch pipes:one is same direction with the inflow pipe, the other have a 45 degree angle to inflow pipe. The WYE have two branch pipes at a 45 degree angle between them, and the two branch pipes are symmetrical to the centerline of the inflow pipe which means the two outflow direction are both at 22.5 degree to the inflow direction.
Comparing the two lateral pipe fittings, when the inflow pipe direction is horizontal to the ground,we can choose the lateral tee for better support from ground,and when the inflow pipe direction is vertical, then we’d better use the WYE fitting, it will bring a symmetrical interaction force to the piping system. Such designing will make sure the pipe in a stable support when running.


From: www.youtube.com

Source: China Lateral Tee Manufacturer – Yaang pipe fitting Industry Co., Limited (www.ugsteelmill.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:

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  • HOW TO GET HIGH QUALITY STEEL PIPES

References:

  • https://en.wikipedia.org/wiki/Piping_and_plumbing_fitting#Wye_(Y)_fitting
  • https://www.amazon.com/s/ref=sr_nr_p_n_feature_seven_br_5?fst=as%3Aoff&rh=n%3A16310091%2Cn%3A%2116310161%2Cn%3A3021479011%2Cn%3A3021480011%2Cn%3A383612011%2Cp_n_feature_four_browse-bin%3A3052049011%2Cp_n_feature_seven_browse-bin%3A5485702011&bbn=383612011&ie=UTF8&qid=1513985541&rnid=3071213011
  • https://www.yaang.com

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