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Even welding and smooth weld line, can be substitute for seamless tube after drawing and cold rolling.

ASME B16.9

This Standard covers overall dimensions, tolerances, ratings, testing, and markings for wrought factory-made buttwelding fittings in sizes NPS 1 ⁄ 2 through 48 (DN 15 through 1200).

ASTM A234/ SA234M

ASTM A234/ SA234M Standard specification for pipe fittings of wrought carbon steel and alloy steel for moderate and high temperature service.

Key Specifications/Special Features of pipe reducer, reducer fittings

Standard: ANSI B16.9 / 16.28, ASTM A53/A106, API 5L, ASME B36.10M—1996, DIN2605 / 2615 / 2616, JIS P2311/2312

Surface treatment: Transparent oil, rust-proof black oil or hot galvanized.

Based on different materials, pipe reducers include carbon steel reducer, stainless steel reducer, and alloy steel reducer etc.
Depending on their construction, pipe reducers contain threaded reducer, tapered reducer and anti-roll reducer etc.

Welded pipe fittings are made as per ASME spec B16.9. ASME B16.9 covers factory made wrought steel butwelding fittings in sizes 1/2″ to 48″. This standard however does not cover low pressure corrosion resistant buttwelding fittings. See MSS SP-43, Wrought Stainless Steel Butt-Welding Fittings.A234 WPB is the most common material used for carbon steel butt welded fittings.

ASTM A234 WPB is the Standard Specification for Piping Fittings of Wrought Carbon Steel and Alloy Steel for Moderate and High Temperature Service.

Specifications

ASTM: A234 WPB
ASME: B16.9, B.11
NACE: MRO175
MSS: SP-83, SP-95

Nominal pipe	Outside Diameter at Bevel				Center to End
DN size	D1		D2		End to End
DN size	Series A	Series B	Series A	Series B	L
20×15	26.9	25	21.3	18	38
25×20	33.7	32	26.9	25	51
25×15	33.7	32	21.3	18	51
32×25	42.4	38	33.7	32	51
32×20	42.4	38	26.9	25	51
32×15	42.4	38	21.3	18	51
40×32	48.3	45	42.4	38	64
40×25	48.3	45	33.7	32	64
40×20	48.3	45	26.7	25	64
40×15	48.3	45	21.3	18	64
50×40	60.3	57	48.3	45	76
50×32	60.3	57	42.4	38	76
50×25	60.3	57	33.7	32	76
50×20	60.3	57	26.9	25	76
65×50	76.1(73)	76	60.3	57	89
65×40	76.1(73)	76	48.3	45	89
65×32	76.1(73)	76	42.4	38	89
65×25	76.1(73)	76	33.7	32	89
80×65	88.9	89	76.1(73)	76	89
80×50	88.9	89	60.3	57	89
80×40	88.9	89	48.3	45	89
80×32	88.9	89	42.4	38	89
90×80	101.6	-	88.9	-	102
90×65	101.6	-	76.1(73)	-	102
90×50	101.6	-	60.3	-	102
90×40	101.6	-	48.3	-	102
90×32	101.6	-	42.4	-	102
100×90	114.3	108	101.6	-	102
100×80	114.3	108	88.9	89	102
100×65	114.3	108	76.1(73)	76	102
100×50	114.3	108	60.3	57	102
100×40	114.3	108	48.3	45	102
125×100	139.7	133	114.3	108	127
125×90	139.7	-	101.6	-	127
125×80	139.7	133	88.9	89	127
125×65	139.7	133	76.1(73)	76	127
125×50	139.7	133	60.3	57	127
150×125	168.3	159	139.7	133	140
150×100	168.3	159	114.3	108	140
150×90	168.3	-	101.6	-	140
150×80	168.3	159	88.9	89	140
150×65	168.3	159	76.1(73)	76	140
200×150	219.1	219	163.8	159	152
200×125	219.1	219	139.7	133	152
200×100	219.1	219	114.3	108	152
200×90	219.1	-	101.6	-	152
250×200	273	273	219.1	219	178
250×150	273	273	168.3	159	178
250×125	273	273	139.7	133	178
250×100	273	273	114.3	108	178
300×250	323.9	325	273	273	203
300×200	323.9	325	219.1	219	203
300×150	323.9	325	168.3	159	203
300×125	323.9	325	139.7	133	203
350×300	355.6	377	323.9	325	330
350×250	355.6	377	273	273	330
350×200	355.6	377	219.1	219	330
350×150	355.6	377	168.3	159	330
400×350	406.4	426	355.6	377	356
400×300	406.4	426	323.9	325	356
400×250	406.4	426	273	273	356
400×200	406.4	426	219.1	219	356
450×400	457.2	478	406.4	426	381
450×350	457.2	478	355.6	377	381
450×300	457.2	478	323.9	325	381
450×250	457.2	478	273	273	381
500×450	508	529	457.2	478	508
500×400	508	529	406.4	426	508
500×350	508	529	355.6	377	508
500×300	508	529	323.9	325	508
550×500	559	-	508	-	508
550×450	559	-	457	-	508
550×400	559	-	406	-	508
550×350	559	-	356	-	508
600×550	610	-	559	-	508
600×500	610	630	508	530	508
600×450	610	630	457	480	508
600×400	610	630	406	426	508
650×600	660	-	610	-	610
650×550	660	-	559	630	610
650×500	660	-	508	-	610
650×450	660	-	457	630	610
700×650	711	-	660	-	610
700×600	711	720	310	720	610
700×550	711	-	559	-	610
700×500	711	720	508	630	610
750×700	762	-	711	-	610
750×650	762	-	660	-	610
750×600	762	-	610	-	610
750×550	762	-	559	-	610
800×750	813	-	762	-	610
800×700	813	820	711	720	610
800×650	813	-	660	-	610
800×600	813	820	610	630	610
850×800	864	-	813	-	610
850×750	864	-	762	-	610
850×700	864	-	711	-	610
850×650	864	-	660	-	610
900×850	914	-	864	-	610
900×800	914	920	813	820	610
900×750	914	-	762	-	610
900×700	914	920	711	820	610
950×900	965	-	914	-	610
950×850	965	-	864	-	610
950×800	965	-	813	-	610
950×750	965	-	762	-	610
1000×950	1016	-	965	-	610
1000×900	1016	1020	914	920	610
1000×850	1016	-	864	-	610
1000×800	1016	1020	813	920	610
1050×1000	1067	-	1016	-	610
1050×950	1067	-	965	-	610
1050×900	1067	-	914	-	610
1050×850	1067	-	864	-	610
1100×1050	1118	-	1067	-	610
1100×1000	1118	1120	1016	1020	610
1100×950	1118	-	965	-	610
1100×900	1118	1120	914	1020	610
1150×1100	1168	-	1118	-	711
1150×1050	1168	-	1067	-	711
1150×1000	1168	-	1016	-	711
1150×950	1168	-	965	-	711
1200×1150	1220	-	1168	-	711
1200×1100	1220	1220	1118	1120	711
1200×1050	1220	-	1067	-	711
1200×1000	1220	1220	1016	1120	711

Length of reducers
The length of a Reducer is very short in relation to the diameter, so in some dimensions the transition from one to another diameter is very abruptly. For example, a reducer 6″ x 2½” has a length of 140 mm. On this short distance a pipeline will be reduced from 168.3 mm O.D. to 73 mm O.D. During the design phase of a new pipe system, a piping designer certainly must think about it.

Pipe Reducers

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ASME B16.9

ASTM A234/ SA234M

Key Specifications/Special Features of pipe reducer, reducer fittings

Abrasion resistant reducer