Pipe Tee dimensions are covered in ASME B16.9. Refer to the table given below for the size 1/2″ to 48″. In piping, two types of tees are used, straight or equal and reducing tee. The following shall be checked during the inspection of Pipe Tee Dimensions.

  • The diameter of the branch and run pipe
  • The thickness of the tee
  • Center to center dimension for branch
  • Length of the tee.

Straight / Equal Tee Dimensions

equal tee dimensions
Pipe Tee Dimensions As Per ASME B16.9
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 dimensions
Pipe Tee Dimensions As Per ASME B16.9
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

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Pipe Fittings Dimensions Tolerance as per ASME B16.9

Dimension Tolerance for tee
NOMINAL PIPE SIZE ALL FITTINGS ALL FITTINGS ALL FITTINGS ELBOWS AND 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 0.06 0.25 0.25 0.03 0.06 0.12
4 0.06 0.06 0.06 0.25 0.25 0.03 0.06 0.12
5 to 8 0.09
-0.06 		0.06 0.06 0.25 0.25 0.03 0.06 0.25
10 to 18 0.16
-0.12 		0.12 0.09 0.38 0.25 0.06 0.09 0.25
20 to 24 0.25
-0.19 		0.19 0.09 0.38 0.25 0.06 0.09 0.25
26 to 30 0.25
-0.19 		0.19 0.12 … … … 0.19 0.38
32 to 48 0.25
-0.19 		0.19 0.19 … … … 0.19 0.38
NOMINAL PIPE SIZE NPS ANGULARITY TOLERANCES ANGULARITY TOLERANCES ALL DIMENSIONS ARE GIVEN IN INCHES. TOLERANCES ARE EQUAL PLUS AND MINUS EXCEPT AS NOTED.
Off Angle Q Off Plane P (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.
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

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About Author

Varun Patel, B.E – Mechanical, PMP®

19+ years of experience in the oil and gas sector, specializing in project management, contracts, project control, project coordination, QA/QC and inspection of large-scale Greenfield and Brownfield Projects such as Refinery, Petrochemical, Wellhead production, and Process platform. Proven track record of delivering large-scale projects while ensuring adherence to safety and quality standards. Skilled in leading and mentoring cross-functional teams and resolving technical issues to achieve successful project outcomes.