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A straight tee means a tee of pipe fitting which the branch outlet has a 90 degree direction turning from the main pipe of the tee.Commonly people consider the straight tee as the equal tee,it is a mistake.Equal tee means a same sizes of the branch and main pipe of a tee.Straight tee means it has a side port at right angle to the run.

ASTM Standard Material	ASTM A53 A53M Standard Specification for Pipe, Steel, Black and Hot-Dipped, Zinc-Coated, Welded and Seamless
	ASTM A106 A106M Standard Specification for Seamless Carbon Steel Pipe for High-Temperature Service
	API 5L Specification for Line Pipe
	ASTM A312 A312M Standard Specification for Seamless, Welded, and Heavily Cold Worked Austenitic Stainless Steel Pipes
	ASTM A234 A234M Standard Specification for Piping Fittings of Wrought Carbon Steel and Alloy Steel for Moderate and High Temperature Service
	ASTM A403 A403M Standard Specification for Wrought Austenitic Stainless Steel Piping Fittings
	ASTM A420 A420M Standard Specification for Piping Fittings of Wrought Carbon Steel and Alloy Steel for Low-Temperature Service
	ASTM A860 A860M Standard Specification for Wrought High-Strength Low-Alloy Steel Butt-Welding Fittings
	ASTM A733 Standard Specification for Welded and Seamless Carbon Steel and Austenitic Stainless Steel Pipe Nipples
DIN Standard Material	DIN1629 Seamless Circular Unalloyed Steel Tubes Subject to special requirements
	DIN 2440 Medium-weight threaded steel tubes
	DIN 2441 Steel Tubes Heavy Weight For Suitable For Screwing
GOST Standard Material	GOST-1050 Sized Bars Made of High-Quality Structural Carbon Steel With a Special Surface Finish
	GOST 8732 Seamless hot-deformed steel pipes-Range of sizes
	GOST 19281 Rolled Steel With Enhanced Strength
JIS Standard Material	JIS G3452 Carbon steel pipes for ordinary piping
	JIS G3454 Carbon steel pipes for pressure service
	JIS G3455 Carbon steel pipes for high pressure service
	JIS G3456 Carbon steel pipes for high temperature service
	JIS G3457 Arc welded carbon steel pipes
	JIS G3458 Alloy Steel Pipes
	JIS G3459 Stainless steel pipes
	JIS G3460 Steel pipes for low temperature service
BS EN Standard Material	BS EN 10255 Non-alloy steel tubes suitable for welding and threading Technical delivery conditions
	BS EN 10253-1 Butt-Welding Pipe Fittings Part 1: Wrought Carbon Steel for General Use and Without Specific Inspection Requirements
	BS EN 10253-2 Butt-welding pipe fittings. part 2: Non alloy ferritic alloy steels with specific inspection requirements
	BS EN10253-3 Butt-welding pipe fittings Part 3: Wrought austenitic and austenitic-ferritic (duplex) stainless steels without specific inspection requirements
	BS EN 10253-4 Butt-welding pipe fittings Part 4:Wrought austenitic and austenitic-ferritic （duplex）stainless steels with specific inspection requirementOn the contrary to the straight tee,it is the lateral pipe tee.The straight tee could be a equal tee,also could be a reducing pipe tee (unequal tee).

straight-tee-drawing

Officially a straight tee will be indicated by 3 diameters,namely 3 x 3 x 2 (A x B x C).The A & B measure stands for the Nominal Pipe Size of Run-Pipe, C measure stands for Nominal Pipe Size of Outlet.
Standard: ASME/ANSI B16.9, MSS-SP-75, DIN 2615, EN 10253-2 , JIS B2311, GOST 17378
Material: ASTM A234, ASTM 403,DIN 17175, EN10228 …Carbon steel, stainless steel , alloy steel.
Size: 1/2″-96″. DN15-DN2400
Connect method: Butt welding.
Type: Seamless: DN15-DN600,
Welded: DN15-DN1800

A straight tee means a tee of pipe fitting

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