Pipe Fittings

Seamless Carbon Steel Concentric and Eccentric Pipe Reducer, ASME B16.9

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A pipe reducer is a fitting connecting pipes of different diameters in a pipeline system. With varying end diameters, it smoothly transitions between pipe sizes, regulates flow speed and pressure by changing fluid channel area (e.g., speeding up flow from large to small diameter, slowing it from small to large), adapts to equipment interface differences, and balances pipeline layouts to avoid resistance or stress from abrupt diameter changes. Types include concentric and eccentric reducers, widely used in chemical, construction, and petroleum industries.

Quick Details Table

Product types	Bw concentric & eccentric Reducer
Outside Diameter	1/2”~60” (DN15~DN1500)
Thinkness	SCH5s, SCH10s, SCH40, SCH80,
Standards	ASME B16.9, MSS SP-75, DIN 28011, JIS B 2312, EN10253-2

product description

Specifications

Main Application

Advantages

Material Grade

Carbon Steel: ASTM A234 WPB, WPC ASTM A420 WPL9, WPL3, WPL6

Stainless Steel: ASTM A403 WP304/304L,WP316/316L,WP321,WP347

Alloy Steel: ASTM A234WP1, WP12, WP11,WP22, WP5, WP9, WP91, Duplex & Super Duplex Stainless Steel, ASTM A815 UNS S31803, UNS S32750, UNS S32760

Suface Treatment

Anti-rust oil, black paint, electric galvanized, hot-dip galvanized

Specifications of Pipe Reducer

Nominal Diameter		Outside Diameter *D1D2**		End to End	Nominal Diameter		Outside Diameter *D1D2**		End to End
DN	NPS	Series A	Series B	H	DN	NPS	Series A	Series B	H
20×15	3/4×1/2	26.9×21.3	25×18	38	450×350	18×14	457×355.6	478×377	381
20×10	3/4×3/8	26.9×17.3	25×14	38	450×300	18×12	457×323.9	478×325	381
25×20	1×3/4	33.7×26.9	32×25	51	450×250	18×10	457×273.0	478×273	381
25×15	1×1/2	33.7×21.3	32×18	51	500×450	20×18	508×457	529×426	508
32×25	1.1/4×1	42.4×33.7	38×32	51	500×400	20×16	508×406.4	529×377	508
32×20	1.1/4×3/4	42.4×26.9	38×25	51	500×350	20×14	508×355.6	529×478	508
32×15	1.1/4×1/2	42.4×21.3	38×18	51	500×300	20×12	508×323.9	529×325	508
40×32	1.1/2×1.1/4	48.3×42.4	45×38	64	550×500	22×20	559×508	-	508
40×25	1.1/2×1	48.3×33.7	45×32	64	550×450	22×18	559×457	-	508
40×20	1.1/2×3/4	48.3×26.9	45×25	64	550×400	22×16	559×406.4	-	508
40×15	1.1/2×1/2	48.3×21.3	45×18	64	550×350	22×14	559×355.6	-	508
50×40	2×1.1/2	60.3×48.3	57×45	76	600×550	24×22	610×559	-	508
50×32	2×1.1/4	60.3×42.4	57×38	76	600×500	24×20	610×508	630×529	508
50×25	2×1	60.3×33.7	57×32	76	600×450	24×18	610×457	630×478	508
50×20	2×3/4	60.3×26.9	57×25	76	600×400	24×22	610×406.4	630×426	508
65×50	2.1/2×2	73.0×60.3	76×57	89	650×600	26×24	660×610	-	610
65×40	2.1/2×1.1/2	73.0×48.3	76×45	89	650×550	26×22	660×559	-	610
65×32	2.1/2×1.1/4	73.0×42.4	76×38	89	650×500	26×20	660×508	-	610
65×25	2.1/2×1	73.0×33.7	76×32	89	650×450	26×18	660×457	-	610
80×65	3×2.1/2	88.9×73.0	89×76	89	700×650	28×26	711×660	-	610
80×50	3×2	88.9×60.3	89×57	89	700×600	28×24	711×610	720×630	610
80×40	3×1.1/2	88.9×48.3	89×45	89	700×550	28×22	711×559	-	610
80×32	3×1.1/4	88.9×42.4	89×38	89	700×500	28×20	711×508	720×530	610
90×80	3.1/2×3	101.6×88.9	-	102	750×700	30×28	762×711	-	610
90×65	3.1/2×2.1/2	101.6×73.0	-	102	750×650	30×26	762×660	-	610
90×50	3.1/2×2	101.6×60.3	-	102	750×600	30×24	762×610	-	610
90×40	3.1/2×1.1/2	101.6×48.3	-	102	750×550	30×22	762×559	-	610
90×32	3.1/2×1.1/4	101.6×42.4	-	102	800×750	32×30	813×762	-	610
100×90	4×3.1/2	114.3×101.6	-	102	800×700	32×28	813×711	820×720	610
100×80	4×3	114.3×88.9	108×89	102	800×650	32×26	813×660	-	610
100×65	4×2.1/2	114.3×73.0	108×76	102	800×600	32×24	813×610	820×630	610
100×50	4×2	114.3×60.3	108×57	102	850×800	34×32	864×813	-	610
100×40	4×1.1/2	114.3×48.3	108×45	102	850×750	34×30	864×762	-	610
125×100	5×4	141.3×114.3	133×108	127	850×700	34×28	864×711	-	610
125×90	5×3.1/2	141.3×101.6	-	127	850×650	34×26	864×660	-	610
125×80	5×3	141.3×88.9	133×89	127	900×850	36×34	914×864	-	610
125×65	5×2.1/2	141.3×73.0	133×76	127	900×800	36×32	914×813	920×820	610
125×50	5×2	141.3×60.3	133×57	127	900×750	36×30	914×762	-	610
150×125	6×5	168.3×141.3	159×133	140	900×700	36×28	914×711	920×720	610
150×100	6×5	168.3×114.3	159×108	140	950×900	38×36	965×914	-	610
150×90	6×3.1/2	168.3×101.6	-	140	950×850	38×34	965×864	-	610
150×80	6×3	168.3×88.9	159×89	140	950×800	38×32	965×813	-	610
150×65	6×2.1/2	168.3×73.0	159×76	140	950×750	38×30	965×762	-	610
200×150	8×6	219.1×168.3	219×159	152	1000×950	40×38	1016×965	-	610
200×125	8×5	219.1×141.3	219×133	152	1000×900	40×36	1016×914	1020×920	610
200×100	8×4	219.1×114.3	219×108	152	1000×850	40×34	1016×864	-	610
200×90	8×3.1/2	219.1×101.6	-	152	1000×800	40×32	1016×813	1020×820	610
250×200	10×8	273.0×219.1	273×219	178	1050×1000	42×40	1067×1016	-	610
250×150	10×6	273.0×168.3	273×159	178	1050×950	42×38	1067×965	-	610
250×125	10×5	273.0×141.3	273×133	178	1050×900	42×36	1067×914	-	610
250×100	10×4	273.0×114.3	273×108	178	1050×850	42×34	1067×864	-	610
300×250	12×10	323.9×273.1	325×273	203	1100×1050	44×42	1118×1067	-	610
300×200	12×8	323.9×219.1	325×219	203	1100×1000	44×40	1118×1016	1120×1020	610
300×150	12×6	323.9×168.3	325×159	203	1100×950	44×38	1118×965	-	610
300×125	12×5	323.9×141.3	325×133	203	1100×900	44×36	1118×914	1220×920	610
350×300	14×12	355.6×323.9	377×325	330	1150×1100	46×44	1168×1118	-	711
350×250	14×10	355.6×273.0	377×273	330	1150×1050	46×42	1168×1067	-	711
350×200	14×8	355.6×219.1	377×219	330	1150×1000	46×40	1168×1016	-	711
350×150	14×6	355.6×168.3	377×159	330	1150×950	46×38	1168×965	-	711
400×350	16×14	406.4×355.6	426×377	356	1200×1150	48×46	1220×1168	-	711
400×300	16×12	406.4×323.9	426×325	356	1200×1100	48×44	1220×1118	1220×1120	711
400×250	16×10	406.4×273.0	426×273	356	1200×1050	48×42	1220×1067	-	711
400×200	16×8	406.4×219.1	426×219	356	1200×1000	48×40	1220×1016	1220×1020	711
450×400	18×16	457×406.4	478×426	381
THE ABOVE DIMENSIONS COMPLY WITH THE STANDARDS OF ASME B16.9, SH3408, SH3409, HG/T 21635, HG/T 21631 AND SY/T 05010.

Application of Pipe Reducer

1. Chemical Industry: Connecting different-diameter pipes for smooth material transportation in chemical processes.

2. Oil & Gas: Adapting to pipes and equipment of various specs in extraction, transportation, and refining.

3. Construction: Used in water supply/drainage systems and ventilation (e.g., HVAC) to adjust pipe sizes.

4. Power Industry: Enabling diameter changes in steam/cooling water pipelines for power plant systems.

5. Mechanical Manufacturing: Connecting hydraulic/pneumatic fittings of different specs in machinery for stable power transmission.

Advantages of Pipe Reducer

1. Connect pipes of different diameters: Achieve a smooth transition from a large pipe diameter to a small one, facilitating the connection of pipes of different specifications.

2. Balance flow and pressure: Adjust the flow rate and pressure of fluids by changing the pipe diameter, making the pipeline system operate more stably (e.g., reducing the pipe diameter can increase the flow rate and pressure).

3. Convenient installation: With a simple structure, they are easy to install and can be directly welded or threaded between pipes, saving construction time and costs.

4. Wide application range: Commonly used in pipeline systems of industries such as chemical engineering, petroleum, water treatment, and construction, suitable for various media (liquids, gases, etc.).

Seamless Carbon Steel Concentric and Eccentric Pipe Reducer, ASME B16.9

Material Grade

Suface Treatment

Specifications of Pipe Reducer

Application of Pipe Reducer

Advantages of Pipe Reducer

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