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ASTM B16.9 A403 WP304H STD S2205 S31803 SUPER DUPLEX PIPE BARRED TEE
Tee or Tee connection in piping engineering is a very important pipe fitting and is frequently used to combine or divide a flow. Two types of Tee are available, Equal Tee and Reducing Tee. However, in pigged pipelines, one special type of Tee is widely used which is known as Barred Tee or Pigged Tee.
Barred Tee drawings are available , or we could manufacturer according to your specific drawings .
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
Tee vs Barred Tee
Tee is a type of fittings that allows fluid to flow on its main pipe and branch out. The branch can be designed equally the same size as the main pipe (known as Equal Tee), or smaller size than the main pipe (known as Reducing Tee).
Barred Tee is a special type of Tee that base from a normal tee (can be either equal tee or reducing tee) that at later stage, will be added with bar plates inside the branch outlet (From inside it looks like a steel cage) to restrict the pig from flowing from the header pipe into the branch pipes.
Design Codes and Standards for Tee and Barred Tee
The international standard dimension of tee will be covered under ASME B16.9 or MSS-SP 75 (for DN16 and above). To know more about Tee Connections.
There is no international standard dimension for the barred tee. It is custom made using the ASME B16.9/ MSS-SP 75 tee as a base. However, many develop their barred tee based on Shell DEP 31.40.10.13-Gen or ISO 15590-2 standard.
This design can be a guideline to assess Vendor’s design.
Design Considerations for Barred Tee
The barred tee will be used when there is a requirement for pigging. Thus, many of its applications can be found in the pipeline or in the subsea field.
The bar plates that welded internally at the branch are to avoid the pig from changing direction or getting stuck at the branch outlet.
The design of the bar plates must be in sufficient quantity, thickness and adequately spaced to ensure the smoothness for the pig to run through the main pipe, and at the same time not affecting the flow that was meant to flow through the branch. Normal practice is to ensure that the opening in the branch pipeline after guided bars is not more than 40% of the main pipeline area.
The size of the bars in the branch connection has to be small enough not to restrict the flow but large enough to sustain the pressure of the flow.
To ensure the smoothness, the bar plates have to be a grind to suit the branch curvature. Any sharp edges, spatters and burs are required to be removed. This smoothness of the pigging process is important to protect the sensor of the pig from damage.
Refer to Shell DEP 31.40.10.13-Gen Figure 4 above; the quantity of the bar plates start with two (2) pieces and increase as the ID of the branch increase.
The bar plates ideally will be equally spaced.
For larger tee (size 14 inches and above), there will be a bridge plate in the middle to support the bar stiffness when getting hit by the pig.
The material of the bar plates commonly used the same as the tee material for weldability.
Standard practice is to avoid welding of guide bars directly on the high-stress concentrated areas of the extrusion neck. Bar ends must be machined to fit the branch.
Weld Repairs on Parent metal is prohibited.
Difference Between Tee and Barred Tee
So from the above discussion, we can summarize the following differences:
Parameter
Tee
Barred Tee
Definition
Standard Pipe Fitting
A special type of piping component
Manufacturing
Generally by Extrusion or forging
Mostly Fabricated
Use
Used in both piping and pipeline engineering
used in pipeline engineering near the pig launcher/receiver
TOBO GROUP sales head offce in Shanghai.
We are one of the Professional manufacturers Exporter Pipeline products in China .Our company was established in 1998, the plant covers 550, 000 square meters and a construction area of 6,8,000square meters, existing 260 workers and 45 technicia... TOBO GROUP sales head offce in Shanghai.
We are one of the Professional manufacturers Exporter Pipeline products in China .Our company was established in 1998, the plant covers 550, 000 square meters and a construction area of 6,8,000square meters, existing 260 workers and 45 technicia...
