What is barred tee for the pipeline?
The design of this fitting is a derivative of a tee. The only difference between both the fittings is that a Barred Tee is produced with a restriction bar on its branch. The restriction bar will is internally welded into the fittings. Thus, it will prevent the pig from flowing down a branched connection.
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Stainless steel buttweld barred tee manufacturing process
The manufacturing process of a Stainless Steel Buttweld Barred Tee is possible with the hot extrusion process. Here a piece of metal is enclosed in a chamber with a die on one end. The opening of the die will shape the metal into its final shape. In this process, a combination of heat and pressure makes the metal plastic, causing it to assume the desired shape cross-sectionally.
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Barred tee vs normal tee?
With regards to their design and shape, both fittings are similar. A barred tee, however, differs from a normal tee because it has a restriction bar internally welded on its outlet.
Barred tee fitting available in ASTM A420 WPL6/ A234 WPB material for pig launcher or receiver system
How to make a carbon steel barred tee?
Usually, the Stainless Steel Barred Tee Fittings are produced by fabrication, with standard Shell DEP 184.108.40.206-Gen or ISO 15590-2 into consideration. Other design codes like ASME B16.9 or MSS-SP 75 may also be used to produce a Carbon Steel Barred Tee.
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Purpose of a barred straight tee
A Barred Straight Tee is typically seen in engineering sectors, where they are a part of piping systems located near a pig launcher/receiver.
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The function of ASME b16.9 barred tee
The function of an ASME B16.9 Barred Tee is to restrict the movement of a pig from the header pipe into the connected branch.
Design considerations for barred tee
The design of the internally welded plates is required to have adequate spacing, to ensure smoother travelling of the pig through a header pipe. This prevents the pig from either changing its direction or getting stuck at the outlet while permitting the media to flow through in an easy manner. A conventional practice is to restrict the bar design to about 40% (or less) of the main pipeline area. Thus creating sustainable pressure on the media flow.
Smoothness in the bar plates can be ensured by eliminating edges, spatters and bur and grinding them such that it fits the branch curvature. If the process is smooth, the sensor of a pig remains safe from damage. The number of plates in the branch will increase proportionally to its diameter size. The spacing between each plate needs to be equidistant. If a tee is 14 inches and above, the bridge in the centre will support the bar stiffness when it gets hit by the pig. To ensure good weldability, the material used to construct the bar plates, will be the same as the tee. Since the area is under high-stress levels, it is best to avoid welding bars on the neck area. Instead, they need to be machined. Similarly, welding is not to be practised on the parent material.