What’s the difference between tee and barred tee?

Tee is a type of butt weld pipe 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 (called Equal Tee), or smaller size than the main pipe (called Reducing Tee).Design code ASME B16.9 or MSS-SP 75.

Barred tee is a special type of BW 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.Barred tee actually is the BW tee welded with bars.Design code ASME B16.9 or MSS-SP 75 and Shell DEP or ISO 15590-2.

Except the material,Bevel end,Marking and painting,package same.We can summarize the following differences:

Item Butt weld Tee Barred Tee

ASME B16.9 ASTM A403 WP304L equal tees

ASME B16.9 ASTM A403 WP304L equal tees

Barred tees(pigged tees)

Barred tees(pigged tees)

Definition Standard BW Pipe Fitting A special type of piping component
Manufacturing Generally by Extrusion or forging Fabricated
Use Used in both piping and pipeline engineering Used in pipeline engineering near the pig launcher/receiver
Design Code / Standard ASME B 16.9/MSS SP 75 Shell DEP or ISO 15590-2
Production Quantity Large scale in bulk Select small quantities (custom made)
Cost Cheaper Costlier than normal Tee

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