Steel pipe tee is a traditional branch connection fitting that can provide three branches for changing fluid direction in the industrial pipeline system. The diverse functions make it more prevalent in pipe fittings. There are two types that Equal Tee ( Straight Tee) and Reducing Tee ( Reducer Tee).

How to Classify the Steel Pipe Tee

According to the shapes, there are two types.

• Equal Tee
• Reducing Tee

According to the connection, there are three types.

• Butt Weld Tee
• Socket Weld Tee
• Threaded Tee

According to the material grade, there are six types.

• Carbon Steel Pipe Tee
• Copper Nickel Tee
• Alloy Steel Tee
• Nickel Alloy Tee
• Stainless Steel Tee
• Duplex Steel Tee

Equal Tee vs Reducing Tee

Stainless Steel Equal Tee

We also call it as straight tee, because three branches are in same size. While the customer always describe stainless steel equal tee as below.

EQUAL TEE 6″ SCH40 BW ASTM A403 WP316 ASME B16.9

Carbon Steel Reducing Tee

Usually the branch diameter is smaller than run pipe diameter. When you buy it, you can describe low temp carbon steel reducing tee as below.

TEE REDUCING 3″ X 2″ BW SCH80 X SCH80 ASTM A420-WPL6 ASME B16.9

Connection Types of Steel Pipe Tee

Butt Weld Tee

It is widely used in petroleum, Oil & gas industry, Chemical industry, Marine industry, Pipeline engineering and Power industry.
When the thickness is below 3mm, the ends of butt weld fittings will be in plain, otherwise the ends should be beveled. The size in NPS (DN) has large range and thickness in schedule.

BW Tee Weight Chart

Socket Weld Tee

We call it as a kind of high pressure pipe fitting. The pressure rating is 3000lb, 6000lb and 9000lb.
It is a pipe connection method for inserting pipe into valve, pipe fittings and flange. It is usually used for 4 inch or below.

SW Tee Weight Chart

Threaded Tee

It is manufacturing by forging process, and formed by heating forging with ingots or round bars, then turning on a lathe to process threads.

The thread type is usually NPT, PT, FNPT, BSPP and BSPT.

THD Tee Weight Chart

Material & Grades for Steel Pipe Tee

Carbon Steel Reducing Tee

ASTM A105, A694 F52, F60, F65, F70, ASTM A350 LF2, LF3
ASTM A234 WPB, A860 WPHY42, 52, 60, 65, 70 A420 WPL3,WPL6, WPL9

Alloy Steel Equal Tee

ASTM A234 WP1, WP5, WP9, WP11, WP12, WP22, WP91  
ASTM A182 F1, F5, F9, F11, F12, F22, F91

Stainless Steel Pipe Tee

ASTM A403 WP304/304L/304H, WP316/316L, WP310, WP317, WP321, WP309
ASTM A182 F304/304L/304H, F316/316L, F310, F317, F321, F309

Duplex Steel Tee

ASTM A182 F51, F53, F55, S 31803, S 32205, S 32550, S 32750, S 32760

Copper Nickel Pipe Fittings

ASTM B151 UNS C70600 / C70610 / C70620

Nickel Alloy Forged Fittings

ASTM / ASME SB 336, ASTM / ASME SB 564 / 160 / 163 / 472, UNS 2200 (NICKEL 200) , UNS 2201 (NICKEL 201 ) , UNS 4400 (MONEL 400 ) , UNS 8020 ( ALLOY 20 / 20 CB 3 ) , UNS 8825 INCONEL (825) , UNS 6600 (INCONEL 600 ) , UNS 6601 (INCONEL 601) , UNS 6625 (INCONEL 625) , UNS 10276 (HASTELLOY C 276)

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