ASTM B16.9 A403 WP304H STD S2205 S31803 SUPER DUPLEX PIPE BARRED TEE

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 Grades:

·Stainless Steel: ASTM, A403, WP304 / 304L / 304H / 316 / 316L / 317 / 317L / 321 / 310 / 347 / 904L
·Carbon Steel: ASTM, A234, WPB / A420, WPL3 / A420, WPL6 / MSS-SP-75, WPHY 42 / 46 / 52 / 56 / 60 / 65 / 70
·Alloy Steel: ASTM A234 WP1 / WP5 / WP9 / WP11 / WP22 / WP91

Barred Tee drawings are available , or we could manufacturer according to your specific drawings .

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

1. 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.
2. 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.
3. 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:

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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 technicians.

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• Stainless steel pipe & tube

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• Tubing and casting

(line pipe,water pipeline,gas pipeline,oil pipeline)

• Special steel tube

(copper tube/titanium tube/aluminium tube/nickel alloy )

• steel bar

(round bar/angle steel /flat steel/channel steel/steel wire)

• Pipe Fittings

(eblows, equal / reducing tees, concentric/eccentric reducers, caps, crosses, bends, dish end/end cup, stub ends, unions, couplings / hex couplings, swage nipples , nipples, hex. plug, sockolet, weldolet, thredolet, etc)

• Flange

(DIN flange/ AISI flange/blind flange/welding flange/stainless flange/slip on flange)

• steel sheet / coil

(stainless steel/carbon steel/alloy steel/galvanized steel/aluminium )

• Valve

(ball valve/gate valve/butterfly valve/globe valve/swing check valve/ check valve)

In order to comply with the global modernization services development trends and eliminating the varieties distress of the global enterprise‘s purchase in the consumables.. We coordinate the pressure pipe manufacturer which with the scale of production,quality control and high cost performance (has passed ISO 9001 quality series attestation, ccs, DNV,PED/97/23/EC,AD2000-WO,special equipment manufacturing license,ASME-SA182.through a variety of effective assort mechanism to make up the shortage of supply and Post-processing of VAT enterprise, and to supply high quality pipe fittings, because of the superior quality and good service, we have established long term business cooperation with more than 60 countries and areas,which covers Europe, Africa, South America, North America, Middle East, Taiwan and South East Asia and so on.

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Our business principle is "Superior quality, Competitive price, Timely delivery and Considerate service " Standing to the principle of “Enterprises focus on the core business”, TOBO will actively promotes the globalization of business strategy approach, using advanced supply chain management technology to service for clients with higher quality and more competitiveness ‘ s products. At the same time, we sincerely reply your inquiry, honesty waiting for your visiting and wish to have cooperation with you at the any time. We welcome all the customers to contact us for more information. We assure you, with our technical knowledge and experience, our company will be one of your Stable, Continuate business parters in China.

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