ASME B16.9 Butt Weld Equal Tee Reducing Tee

ASME B16.9 Butt Weld Tee Manufacturer & Supplier

We are a leading manufacturer and exporter of ASME B16.9 Butt Weld Tees, supplying high-quality equal tees and reducing tees in carbon steel, alloy steel, stainless steel, and special alloys. Designed in compliance with ASME B16.9, our butt weld tees provide a strong welded joint for branching pipelines in oil & gas, petrochemical, power, shipbuilding, and water treatment industries.

Tees straight(Equal Tee) and reducing

The primary purpose of a Tee is to make a 90° branch from the main run of pipe. Standard there are 2 possibilities, on behalf of the equal tee and reducing tee. The equal tee (or straight tee) is used as the branch has the same diameter as the run-pipe. The reducing tee is used as the branch has a smaller diameter as the run-pipe.

Standard Overview

• Standard: ASME B16.9 – Factory-Made Wrought Buttwelding Fittings
• Type: Butt Weld Tee (Equal Tee, Reducing Tee)
• Sizes: ½” NB to 48” NB (DN15 – DN1200)
• Schedule/Thickness: SCH 10S, 20, 40, 80, 160, XXS
• EN 10253-4 Butt weld Tee

Types of Butt Weld Tees

• Equal Tee (Straight Tee): Branch bore = Main bore
• Reducing Tee: Branch bore smaller than main bore

Butt Weld Tee Material for ASME B16.9

Wrought fittings covered by this Standard shall be in accordance with ASTM A234, ASTM A403, ASTM A420, ASTM A815, ASTM B361, ASTM B363, ASTM B366, or the corresponding specification listed in ASME BPVC, Section II. The term “wrought” denotes fittings made of pipe, tubing, plate, or forgings. For purposes of determining proof testing requirements of section 9, the materials are grouped by similar properties as shown in below table

Group No.	Material	Standards
1	Carbon and low – alloy steels	ASTM A234/A234M and ASTM A420/A420M
2	Austenitic and duplex stainless steels	ASTM A403/A403M and ASTM A815/A815M
3	Nickel alloys	ASTM B366/B366M
4	Aluminum alloys	ASTM B361
5	Titanium alloys	ASTM B363

Butt weld Tee Materials Gade

• Carbon Steel: ASTM A234 WPB Equal Tee, WPC Reducing Tee
• Alloy Steel: ASTM A234 WP5 Tee,WP9, WP11,WP12,WP22,WP91,WP92
• Stainless Steel: ASTM A403 WP304, WP304L, WP316, WP316L, WP321, WP347
• Nickel Alloys: Inconel, Monel, Hastelloy
• Duplex & Super Duplex Stainless Steel:ASTM A815 WPS31803 Tee,ASTM A815 WPS32750 Tee

Standard Marking Requirement for ASME B16.9 Butt Weld Tee

Each elbow marks permanently , indicating the following content:
The name or trademark of the manufacturer
Material identification mark (ASTM or ASME level symbol)
Wall thickness serial number or nominal wall thickness
Specifications – Engineering pipe diameter (NPS) related to end connection should be used
Compliance – standard and special pipe fittings

Dimensions Butt Weld Straight Tees ASME B16.9

NPS	O.D. D	Center to End C	Center to End 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	216	216
12	323.8	254	254
14	355.6	279	279
16	406.4	305	305
18	457	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

Dimensions are in millimeters unless otherwise indicated.
Wall thickness (t) must be specified by customer.
Outlet dimension (M) for NPS 26 and larger is recommended but not required.

Dimensional Tolerances Straight Tees ASME B16.9

NPS	1/2 to 2.1/2	3 to 3.1/2	4	5 to 8	10 to 18	20 to 24	26 to 30	32 to 48
Outside Dia at Bevel (D)	+1.6 -0.8	1.6	1.6	+2.4 -1.6	+4 -3.2	+6.4 -4.8	+6.4 -4.8	+6.4 -4.8
Inside Dia at End	0.8	1.6	1.6	1.6	3.2	4.8	+6.4 -4.8	+6.4 -4.8
Center to End (C / M)	2	2	2	2	2	2	3	5
Wall Thk (t)	Not less than 87.5% of Nominal Wall Thickness

NPS	O.D. D	O.D. D1	Center to End C	Center to End M
3/4 – 1/2	26.7	21.3	29	29
1 – 1/2	33.4	21.3	38	38
1 – 3/4	33.4	26.7	38	38
1.1/4 – 1/2	42.2	21.3	48	48
1.1/4 – 3/4	42.2	26.7	48	48
1.1/4 – 1	42.2	33.4	48	48
1.1/2 – 1/2	48.3	21.3	57	57
1.1/2 – 3/4	48.3	26.7	57	57
1.1/2 – 1	48.3	33.4	57	57
1.1/2 – 1.1/4	48.3	42.2	57	57
2 – 3/4	60.3	26.7	64	44
2 – 1	60.3	33.4	64	51
2 – 1.1/4	60.3	42.2	64	57
2 – 1.1/2	60.3	48.3	64	60
2.1/2 – 1	73	33.4	76	57
2.1/2 – 1.1/4	73	42.2	76	64
2.1/2 – 1.1/2	73	48.3	76	67
2.1/2 – 2	73	60.3	76	70
3 – 1.1/4	88.9	42.2	86	70
3 – 1.1/2	88.9	48.3	86	73
3 – 2	88.9	60.3	86	76
3 – 2.1/2	88.9	73	86	83
3.1/2 – 1.1/2	101.6	48.3	95	79
3.1/2 – 2	101.6	60.3	95	83
3.1/2 – 2.1/2	101.6	73	95	89
3.1/2 – 3	101.6	88.9	95	92
4 – 1.1/2	114.3	48.3	105	86
4 – 2	114.3	60.3	105	89
4 – 2.1/2	114.3	73	105	95
4 – 3	114.3	88.9	105	98
4 – 3.1/2	114.3	101.6	105	102

NPS	O.D. D	O.D. D1	Center to End C	Center to End M
5 – 2	141.3	60.3	124	105
5 – 2.1/2	141.3	73	124	108
5 – 3	141.3	88.9	124	111
5 – 3.1/2	141.3	101.6	124	114
5 – 4	141.3	114.3	124	117
6 – 2.1/2	168.3	73	143	121
6 – 3	168.3	88.9	143	124
6 – 3.1/2	168.3	101.6	143	127
6 – 4	168.3	114.3	143	130
6 – 5	168.3	141.3	143	137
8 – 3.1/2	219.1	101.6	178	152
8 – 4	219.1	114.3	178	156
8 – 5	219.1	141.3	178	162
8 – 6	219.1	168.3	178	168
10 – 4	273	114.3	216	184
10 – 5	273	141.3	216	191
10 – 6	273	168.3	216	194
10 – 8	273	219.1	216	203
12 – 5	323.8	141.3	254	216
12 – 6	323.8	168.3	254	219
12 – 8	323.8	219.1	254	229
12 – 10	323.8	273	254	241
14 – 6	355.6	168.3	279	238
14 – 8	355.6	219.1	279	248
14 – 10	355.6	273	279	257
14 – 12	355.6	323.8	279	270
16 – 6	406.4	168.3	305	264
16 – 8	406.4	219.1	305	273
16 – 10	406.4	273	305	283
16 – 12	406.4	323.8	305	295
16 – 14	406.4	355.6	305	305

NPS	O.D. D	O.D. D1	Center to End C	Center to End M
18 – 8	457	219.1	343	298
18 – 10	457	273	343	308
18 – 12	457	323.8	343	321
18 – 14	457	355.6	343	330
18 – 16	457	406.4	343	330
20 – 8	508	219.1	381	324
20 – 10	508	273	381	333
20 – 12	508	323.8	381	346
20 – 14	508	355.6	381	356
20 – 16	508	406.4	381	356
20 – 18	508	457	381	368
22 – 10	559	273	419	359
22 – 12	559	323.8	419	371
22 – 14	559	355.6	419	381
22 – 16	559	406.4	419	381
22 – 18	559	457	419	394
22 – 20	559	508	419	406
24 – 10	610	273	432	384
24 – 12	610	323.8	432	397
24 – 14	610	355.6	432	406
24 – 16	610	406.4	432	406
24 – 18	610	457	432	419
24 – 20	610	508	432	432
24 – 22	610	559	432	432
26 – 12	660	323.8	495	422
26 – 14	660	355.6	495	432
26 – 16	660	406.4	495	432
26 – 18	660	457	495	444
26 – 20	660	508	495	457
26 – 22	660	559	495	470
26 – 24	660	610	495	483

NPS	O.D. D	O.D. D1	Center to End C	Center to End M
28 – 12	711	323.8	521	448
28 – 14	711	355.6	521	457
28 – 16	711	406.4	521	457
28 – 18	711	457	521	470
28 – 20	711	508	521	483
28 – 22	711	559	521	495
28 – 24	711	610	521	508
28 – 26	711	660	521	521
30 – 10	762	273	559	460
30 – 12	762	323.8	559	473
30 – 14	762	355.6	559	483
30 – 16	762	406.4	559	483
30 – 18	762	457	559	495
30 – 20	762	508	559	508
30 – 22	762	559	559	521
30 – 24	762	610	559	533
30 – 26	762	660	559	546
30 – 28	762	711	559	546
32 – 14	813	355.6	597	508
32 – 16	813	406.4	597	508
32 – 18	813	457	597	521
32 – 20	813	508	597	533
32 – 22	813	559	597	546
32 – 24	813	610	597	559
32 – 26	813	660	597	572
32 – 28	813	711	597	572
32 – 30	813	762	597	584

NPS	O.D. D	O.D. D1	Center to End C	Center to End M
34 – 16	864	406.4	635	533
34 – 18	864	457	635	546
34 – 20	864	508	635	559
34 – 22	864	559	635	572
34 – 24	864	610	635	584
34 – 26	864	660	635	597
34 – 28	864	711	635	597
34 – 30	864	762	635	610
34 – 32	864	813	635	622
36 – 16	914	406.4	673	559
36 – 18	914	457	673	572
36 – 20	914	508	673	584
36 – 22	914	559	673	597
36 – 24	914	610	673	610
36 – 26	914	660	673	622
36 – 28	914	711	673	622
36 – 30	914	762	673	635
36 – 32	914	813	673	648
36 – 34	914	864	673	660
38 – 18	965	457	711	597
38 – 20	965	508	711	610
38 – 22	965	559	711	622
38 – 24	965	610	711	635
38 – 26	965	660	711	648
38 – 28	965	711	711	648
38 – 30	965	762	711	673
38 – 32	965	813	711	686
38 – 34	965	864	711	698
38 – 36	965	914	711	711

NPS	O.D. D	O.D. D1	Center to End C	Center to End M
40 – 18	1016	457	749	622
40 – 20	1016	508	749	635
40 – 22	1016	559	749	648
40 – 24	1016	610	749	660
40 – 26	1016	660	749	673
40 – 28	1016	711	749	673
40 – 30	1016	762	749	698
40 – 32	1016	813	749	711
40 – 34	1016	864	749	724
40 – 36	1016	914	749	737
40 – 38	1016	965	749	749
42 – 26	1067	660	762	698
42 – 28	1067	711	762	698
42 – 30	1067	762	762	711
42 – 32	1067	813	762	711
42 – 34	1067	864	762	711
42 – 36	1067	914	762	711
42 – 38	1067	968	762	711
42 – 40	1067	1016	762	711
42 – 16	1067	406.4	762	635
42 – 18	1067	457	762	648
42 – 20	1067	508	762	660
42 – 22	1067	559	762	660
42 – 24	1067	610	762	660

NPS	O.D. D	O.D. D1	Center to End C	Center to End M
44 – 20	1118	508	813	686
44 – 22	1118	559	813	686
44 – 24	1118	610	813	698
44 – 26	1118	660	813	698
44 – 28	1118	711	813	698
44 – 30	1118	762	813	711
44 – 32	1118	813	813	711
44 – 34	1118	864	813	724
44 – 36	1118	914	813	724
44 – 38	1118	965	813	737
44 – 40	1118	1016	813	749
44 – 42	1118	1067	813	762
46 – 22	1168	559	851	724
46 – 24	1168	610	851	724
46 – 26	1168	660	851	737
46 – 28	1168	711	851	737
46 – 30	1168	762	851	737
46 – 32	1168	813	851	749
46 – 34	1168	864	851	749
46 – 36	1168	914	851	762
46 – 38	1168	965	851	762
46 – 40	1168	1016	851	775
46 – 42	1168	1067	851	787
46 – 44	1168	1118	851	800
48 – 22	1219	559	889	737
48 – 24	1219	610	889	737
48 – 26	1219	660	889	762
48 – 28	1219	711	889	762
48 – 30	1219	762	889	762
48 – 32	1219	813	889	787
48 – 34	1219	864	889	787
48 – 36	1219	914	889	787
48 – 38	1219	965	889	813
48 – 40	1219	1016	889	813
48 – 42	1219	1067	889	813
48 – 44	1219	1118	889	838
48 – 46	1219	1168	889	838

Dimensions Butt Weld Tee ASME B16.9 Tolerance

NPS	DN	O.D	I.D	Off Angle, Q	Off Plane, P
1/2~2-1/2	15~65	+1.6, -0.8	±0.8	±1	±2
3~3-1/2	80~90	±1.6	±1.6	±2	±4
4	100	±1.6	±1.6	±3	±5
5~8	125~200	+2.4, -1.6	±1.6	±3	±6
10~18	250~450	+4.0, -3.2	±3.2	±4	±10
20~24	500~600	+6.4, -4.8	±4.8	±5	±10
26~30	650~750	+6.4, -4.8	±4.8	±5	±13
32~48	800~1200	+6.4, -4.8	±4.8	±5	±19

Technical Specifications

• Dimensions: As per ASME B16.9 & ANSI standards
• End Connections: Butt Weld Ends (beveled as per ASME B16.25)
• Manufacturing Process: Seamless, Welded, or Fabricated
• Testing & Certification:
  • Non-destructive testing (NDE)
  • PMI (Positive Material Identification)
  • EN 10204 3.1 / 3.2 certification
  • Third-party inspection (TÜV, SGS, BV, LR, DNV)

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