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There are:Butt weld tee,Socket weld tee,Threaded tee

Butt weld tee (BW Tee)

Ends in plain or beveled, connected by butt welding process. It could bear higher pressure than the other connection types. Butt weld tee dimensions shall be specified in pipe NPS (DN) and thickness in schedule, where socket weld tee or threaded tee thickness specified in pressure class ratings.

Socket weld tee (SW Tee)

Like the other socket pipe fittings, it has a ladder shaped area, so to insert the pipe into the tee branches then welding together. It usually used for small diameter tubing systems.

Threaded pipe tee (THD Tee)

Based on SW tee forms, the branch end will be threaded to male or female. So there are male branch tee and female branch tee, which if the tube with male NPT threads, then the tee shall be with female NPT threads.

Standards: ASTM A403 (For wrought Austenitic stainless steel tee pipe fittings), ASTM A270 (For seamless and welded Austenitic and Ferritic stainless steel sanitary tubing tee)

Grades: TP 304, 304L, 316, 316L, 310, 317 and 321.

Carbon steel tee material: ASTM A234 WPB, WPC; MSS SP-75 WPHY-42, WPHY-46, WPHY-52, WPHY-56, 60, 65 and 70. ASME/ANSI B16.9 for BW tee fittings, ASME/ANSI B16.11 for socket weld and threaded tee fittings.

Alloy steel material: ASTM A234 WP1, WP5, WP9, WP11, WP22, WP91