Pipe Tee Dimensions

Butt weld pipe Tee allows a 90 degree branch off from a running pipe. This allows for connecting auxiliary equipment to a pipe. A tee is welded on both side to the pipe, leaving the branch open for branch off.

Equal tee (or straight tee ) dimensions

Equal tee

Equre tee (or straight tee), means the branch diameter of this tee is same with the main pipe (Run pipe) diameter of this tee.

NOMINAL PIPE SIZE	OUTSIDE DIAMETER	CENTER TO END	LENGTH
Inch.	OD	C	M
1/2	21.3	25	25
3/4	26.7	29	29
1	33.4	38	38
1 1/4	42.2	48	48
1 1/2	48.3	57	57
2	60.3	64	64
2 1/2	73	76	76
3	88.9	86	86
3 1/2	101.6	95	95
4	114.3	105	105
5	141.3	124	124
6	168.3	143	143
8	219.1	178	178
10	273.1	216	216
12	323.9	254	254
14	355.6	279	279
16	406.4	305	305
18	457.2	343	343
20	508	381	381
22	559	419	419
24	610	432	432
26	660	495	495
28	711	521	521
30	762	559	559
32	813	597	597
34	864	635	635
36	914	673	673
38	965	711	711
40	1016	749	749
42	1067	762	711
44	1118	813	762
46	1168	851	800
48	1219	889	838
	All Dimensions are in mm

Reducing Tee Dimensions

Reducing Tee

Butt weld reducing tee has a branch that is smaller than main run. This allows for branching off to a smaller pipe of equipment from the main run.

NOMINAL PIPE SIZE	OUTSIDE DIAMETER		CENTER TO END
Inch	D	P	C	M
1/2 x 3/8	21.3	17.1	25	25
1/2 x 1/4	21.3	13.7	25	25
3/4 x 1/2	26.7	21.3	29	29
3/4 x 3/8	26.7	17.1	29	29
1 x 3/4	33.4	26.7	38	38
1 x 1/2	33.4	21.3	38	38
1 1/4 x 1	42.2	33.4	48	48
1 1/4 x 3/4	42.2	26.7	48	48
1 1/4 x 1/2	42.2	21.3	48	48
1 1/2 x 1 1/2	48.3	42.2	57	57
1 1/2 x 1	48.3	33.4	57	57
1 1/2 x 3/4	48.3	26.7	57	57
1 1/2 x 1/2	48.3	21.3	57	57
2 x 1 1/2	60.3	48.2	64	60
2 x 1 1/4	60.3	42.2	64	57
2 x 1	60.3	33.4	64	51
2 x 3/4	60.3	26.7	64	44
2 1/2 x 2	73	60.3	76	70
2 1/2 x 1 1/2	73	48.3	76	67
2 1/2 x 1 1/4	73	42.2	76	64
2 1/2 x 1	73	33.4	76	57
3 x 2 1/2	88.9	73	86	83
3 x 2	88.9	60.3	86	76
3 x 1 1/2	88.9	48.3	86	73
3 x 1 1/4	88.9	42.2	86	70
3 1/2 x 3	101.6	88.9	95	92
3 1/2 x 21/2	101.6	73	95	89
3 1/2 x 2	101.6	60.3	95	83
3 1/2 x 1 1/2	101.6	48.3	95	79
4 x 3 1/2	114.3	101.6	105	102
4 x 3	114.3	88.9	105	98
4 x 2 1/2	114.3	73	105	95
4 x 2	114.3	60.3	105	89
4 x 1 1/2	114.3	48.3	105	86
5 x 4	141.3	114.3	124	117
5 x 3 1/2	141.3	101.6	124	114
5 x 3	141.3	88.9	124	111
5 x 2 1/2	141.3	73	124	108
5 x 2	141.3	60.3	124	105
6 x 5	168.3	141.3	143	137
6 x 4	168.3	114.3	143	130
6 x 3 1/2	168.3	101.6	143	127
6 x 3	168.3	88.9	143	124
6 x 2 1/2	168.3	73	143	121
8 x 6	219.1	168.3	178	168
8 x 5	219.1	141.3	178	162
8 x 4	219.1	114.3	178	156
8 x 3 1/2	219.1	101.6	178	152
10 x 8	273.1	219.1	216	203
10 x 6	273.1	168.1	216	194
10 x 5	273.1	141.3	216	191
10 x 4	273.1	114.3	216	184
12 x 10	323.9	273.1	254	241
12 x 8	323.9	219.1	254	229
12 x 6	323.9	168.3	254	219
12 x 5	323.9	141.3	254	216
14 x 12	355.6	323.9	279	270
14 x 10	355.6	273.1	279	257
14 x 8	355.6	219.1	279	248
14 x 6	355.6	168.3	279	238
16 x 14	406.4	355.6	305	305
16 x 12	406.4	323.9	305	295
16 x 10	406.4	273.1	305	283
16 x 8	406.4	219.1	305	273
16 x 6	406.4	168.3	305	264
18 x 16	457	406.4	343	330
18 x 14	457	355.6	343	330
18 x 12	457	323.9	343	321
18 x 10	457	273.1	343	308
18 x 8	457	219.1	343	298
20 x 18	508	457	381	368
20 x 16	508	406.4	381	356
20 x 14	508	355.6	381	356
20 x 12	508	323.9	381	346
20 x 10	508	273.1	381	333
20 x 8	508	219.1	381	324
22 x 20	559	508	419	406
22 x 18	559	457	419	394
22 x 16	559	406.4	419	381
22 x 14	559	355.6	419	381
22 x 12	559	323.9	419	371
24 x 10	559	273.1	419	359
24 x 22	610	559	432	432
24 x 20	610	508	432	432
24 x 18	610	457	432	419
24 x 16	610	406.4	432	406
24 x 14	610	355.6	432	406
24 x 12	610	323.9	432	397
24 x 10	610	273.1	432	384
	All Dimensions are in mm

Pipe Fittings Dimensions Tolerance as per ASME B16.9

NOMINAL PIPE SIZE	ALL FITTINGS	ALL FITTINGS	ALL FITTINGS	ELBOWSAND TEES	180 DEG RETURN BENDS	180 DEG RETURN BENDS	180 DEG RETURN BENDS	REDUCERS	CAPS
NPS	O.D. at Bevel (1), (2)	I.D. at End (1), (3), (4)	Wall Thickness (3)	Centre-to-End Dimension A,B,C,M	Centre-to-Centre O	Back-to-Face K	Alignment of Ends U	Overall Length H	Overall Length E
½ to 2½	0.06 -0.03	0.03	Not less than 87.5% of nominal thickness	0.06	0.25	0.25	0.03	0.06	0.12
3 to 3 ½	0.06	0.06	Not less than 87.5% of nominal thickness	0.06	0.25	0.25	0.03	0.06	0.12
4	0.06	0.06	Not less than 87.5% of nominal thickness	0.06	0.25	0.25	0.03	0.06	0.12
5 to 8	0.09 -0.06	0.06	Not less than 87.5% of nominal thickness	0.06	0.25	0.25	0.03	0.06	0.25
10 to 18	0.16 -0.12	0.12	Not less than 87.5% of nominal thickness	0.09	0.38	0.25	0.06	0.09	0.25
20 to 24	0.25 -0.19	0.19	Not less than 87.5% of nominal thickness	0.09	0.38	0.25	0.06	0.09	0.25
26 to 30	0.25 -0.19	0.19	Not less than 87.5% of nominal thickness	0.12	…	…	…	0.19	0.38
32 to 48	0.25 -0.19	0.19	Not less than 87.5% of nominal thickness	0.19	…	…	…	0.19	0.38

NOMINAL PIPE SIZE NPS	ANGULARITY TOLERANCES	ANGULARITY TOLERANCES
	Off Angle Q	Off Plane P
½ to 4	0.03	0.06
5 to 8	0.06	0.12
10 to 12	0.09	0.19
14 to 16	0.09	0.25
18 to 24	0.12	0.38
26 to 30	0.19	0.38
32 to 42	0.19	0.50
44 to 48	0.18	0.75

ALL DIMENSIONS ARE GIVEN IN INCHES. TOLERANCES ARE EQUAL PLUS AND MINUS EXCEPT AS NOTED.
(1) Out-of-round is the sum of absolute values of plus and minus tolerance.
(2) This tolerance may not apply in localized areas of formed fittings where increased wall thickness is required to meet design requirements of ASME B16.9.
(3) The inside diameter and the nominal wall thicknesses at ends are to be specified by the purchaser.(4) Unless otherwise specified by the purchaser, these tolerances apply to the nominal inside diameter, which equals the difference between the nominal outside diameter and twice the nominal wall thickness.

Types of Pipe Fittings Used in Piping

Pipe Fittings are Piping component that helps in Changes the direction of the flow such as elbows, tees. Changes the size of the pipe such as reducers, reducing tees. Connect different components such as couplings and stop the flows such as Caps.

There are different types of pipe fitting used in piping. Pipe Fittings used in piping work are mainly Elbow, Tee, Reducer, Union, Coupling, Cross, Cap, Swage Nipple, Plug, Bush, Expansion Joint, Adapters, Olet (Weldolet, Sockolet, Elbowlet, Thredolet, Nipolet, Letrolet, Swepolet), Steam Traps, Long Radius Bend, Flanges and Valve.

You can see the chart above that list most widely used standard pipe fittings. These standard fittings are either forging or wrought. Only seamless pipes are used to produce wrought fittings. Large diameter welded fittings are manufactured from the plate.

These Fittings are available in different type of end connections.

Pipe Elbow

The Elbow is used more than any other pipe fittings. It Provides flexibility to change the pipe direction. Elbow mainly available in two standard types 90° and 45°. However, it Can be cut to any other degree. Elbows are available in two radius types, Short radius (1D) and Long radius (1.5D).

90 Degree Elbow Pipe

90 Degree elbow is installed between the pipe to change the direction of the pipe by 90 Degree. Available in long and short radius form.

45 Degree Elbow
45 Degree elbow is installed between the pipe to change the direction of the pipe by 45 Degree.

Long Radius Elbow
In long radius elbow, centreline radius is 1.5 times the nominal size of the pipe or you can say 1.5 times the diameter of the pipe. Normally long radius elbows are used in piping as pressure loss is less as compared to short radius elbow. It required more space than short radius elbow.

Short Radius Elbow

In short radius elbow, centreline radius is same as the nominal size of the pipe or you can say one times the diameter of the pipe. Short radius elbows are used under limited space application. However, it has a high-pressure drop due to a sudden change in the direction of flow.

Reducing Elbow

The 90 reducing elbow is designed to change direction as well as reduce the size of pipe within a piping system. The reducing elbow eliminates one pipe fitting and reduces the welding by more than one-third. Also, the gradual reduction in diameter throughout the arc of the reducing elbow provides lower resistance to flow and reduces the effect of stream turbulence and potential internal erosion. These features prevent sizeable pressure drops in the line.

Pipe Bend

Long radius pipeline bends are used in fluid transportation line which required pigging. Due to their long radius and smooth change of direction, pipe bend has very less pressure drop, and smooth flow of fluid & pig is possible. 3D and 5D Pipe bends are commonly available. Here, D is the pipe size.
Miter Bend

Miter bends are not standard pipe fittings they are fabricated from pipes. Usually, they are preferred for size 10” & above because large size elbow is expensive. Use of miter bend is restricted to the low-pressure water line. Miter bend can be fabricated in 2, 3, & 5 pieces.

Returns – 180 Degree Elbow

Returning elbows are used to make a 180º change in direction. Available in short & long pattern. Returns are used in the heating coil, heat exchanger, tank vent etc.

Pipe Tee

Pipe tee is used for distributing or collecting the fluid from the run pipe. It is a short piece of pipe with a 90-degree branch at center. There are two types of Tee used in piping, Equal / Straight Tee and Reducing / Unequal Tee.

Straight Tee
In straight tee, the diameter of the branch is same as the diameter of the Run (Header) Pipe.

Reducing Tee
In reducing tee, diameter of the branch size is smaller than the diameter of the Run (Header) Pipe

Barred Tee
A barred tee which is also known as a scrapper tee is used in pipelines that are pigged. The branch of the tee has a restriction bar welded internally to prevent the pig or scrapper to enter the branch.

The bars are welded in the branch in a way that it will allow restriction free passage of the pig from the run pipe.

Wye Tee / Lateral
It is a type of Tee which has the branch at a 45° angle, or an angle other than 90°. Wye tee allows one pipe to be joined to another at a 45° angle. This type of tee reduces friction and turbulence that could hamper the flow. Wye tee is also known as a lateral.

Cross

Cross is also known as four-way pipe fitting. A cross has one inlet and three outlets (or vice versa). Generally, crosses are not used in process piping to transport fluid. But forged crosses are common in the fire water sprinkler line.

Pipe Reducers
A pipe reducer changes the size of the pipe. There are two types of reducer used in piping Concentric & Eccentric.
Concentric Pipe Reducer or Conical Reducer

In Concentric reducer which is also known as a conical reducer, the center of both the ends is on the same axis. It maintains the centerline elevation of the pipeline. When the center lines of the larger pipe and smaller pipe are to be maintained same, then concentric reducers are used.

Eccentric Reducer

In Eccentric reducer, the center of both the ends is on different axis as shown in the image. It maintains BOP (bottom of pipe) elevation of the pipeline. When one of the outside surfaces of the pipeline is to be maintained same, eccentric reducers are required.

Offset = ( Larger ID – Smaller ID) / 2

Swage Reducer
The swage is like reducers but small in size and used to connect pipes to smaller screwed or socket welded pipes. Like reducers, they are also available in concentric & eccentric type. Swages are available in different end types. Such as both plain ends or one plain and one threaded end.

Pipe Caps

The cap covers the end of a pipe. Pipe caps are used at the dead end of the piping system. It is also used in piping headers for future connections.

Stub Ends

Stub ends are used with lap joint flange. In this type of flange, the stub is butt welded to the pipe, whereas flange is freely moved over the stub end. It is basically flange part but covered under ASME B16.9 that is why it is considered as pipe fittings.

Piping Union

Unions are used as an alternative to flanges connection in low-pressure small bore piping where dismantling of the pipe is required more often. Unions can be threaded end or socket weld ends. There are three pieces in a union, a nut, a female end, and a male end. When the female and male ends are joined, the nuts provide the necessary pressure to seal the joint.

Pipe Coupling

There are three types of coupling available;

Full Coupling
Full Coupling is used for connecting small bore pipes. It used to connect pipe to pipe or pipe to swage or nipple. It can be threaded or socket ends types.

Half Coupling
Half Coupling is used for small bore branching from a vessel or large pipe. It can be threaded or socket type. It has a socket or thread end on only one side.

Reducing Coupling
Reducing coupling is used to connect two different sizes of pipe. It is like concentric reducer that maintains a center line of the pipe but small in size.

Pipe Nipple

Nipple is a short stub of pipe which has a male pipe thread at each end or at one end. It used for connecting two other fittings. Nipples are used for connecting pipe, hoses, and valves. Pipe nipples are used in low-pressure piping.


Socket weld and Threaded Pipe Fittings

Socket weld and Threaded Pipe Fittings are forged product and classified based on its pressure-temperature rating. Socket weld & Threaded end fittings are available from NPS 1/8” to 4”. These fittings are available in four pressure-temperature rating class.

2000 class fittings are available in only in threaded type.

3000 & 6000 class fittings are available in both Threaded and Socket Weld types.

9000 class fittings are available in only socket weld type.

Socket and threaded fittings are used for small bore and low-pressure piping.

Socket Weld Elbow

Socket Weld Tee and Cross

Threaded Pipe Fittings

Pipe Fittings Dimension of the fittings must meet the requirements of the standard,

For Wrought Product (WP) Dimension is covered in
ASME B16.9- which is standard for Factory-made Wrought Butt-welding Fittings for size NPS 1⁄₂ to NPS 48” and
And B16.28- which is standard for Wrought Steel Butt-Welding Short Radius Elbows and Returns for size NPS 1⁄₂ to NPS 24”
For Forged Fittings Dimension are covered in
ASME B16.11- a standard for Forged Steel Fittings that covers Socket Welding and Threaded fittings