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 31.40.10.13-Gen 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
Picture	ASME B16.9 ASTM A403 WP304L equal 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 31.40.10.13-Gen 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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