3. ASME B16.9 fittings

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Eccentric Reducers

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Description

Eccentric Reducers are a type of pipe fitting with a conical shape, featuring different inlet and outlet diameters that are asymmetrical. One side of the reducer maintains a constant size, while the other side tapers down to the desired size. This creates a smooth transition from a larger pipe to a smaller one, keeping the centerline of the pipe either lower or higher than the centerline of the larger pipe, depending on the reducer’s orientation.

Applications

Fluid and Gas Handling Systems: Eccentric Reducers are commonly used in systems handling water, oil, gas, and chemicals to transition between different pipe sizes.
Oil and Gas Pipelines: They help ensure smooth flow and minimize cavitation.
Petrochemical and Chemical Industries: Used to control flow rate and pressure during operations.
HVAC Systems: Employed in heating, ventilation, and air conditioning systems to adjust airflow.

Standard Specification

ASME B16.9: This standard specifies the dimensions, tolerances, design, testing, and marking of welded and seamless steel pipe fittings.

Technical Specifications according to ASME B16.9:

Sizes: Ranges from 1/2 inch to 48 inches.
Materials: Stainless steel, carbon steel, alloy steel, and other materials suitable for specific environments.
Pressure: Suitable for systems with low to high pressure.
Welding: Designed to be welded to pipes and other fittings.
Tolerances: Conforms to dimensional tolerances specified in ASME B16.9 to ensure compatibility and safety.

Size and Thickness Chart of Eccentric Reducers

Large End Size (NPS)	Small End Size (NPS)	Outside Diameter of Large End (D1) (mm)	Outside Diameter of Small End (D2) (mm)	Length (H) (mm)	Thickness (T) (mm)
1/2	3/8	21.34	17.14	38	2.77
3/4	1/2	26.67	21.34	38	2.87
1	3/4	33.40	26.67	51	3.38
1-1/4	1	42.16	33.40	51	3.56
1-1/2	1-1/4	48.26	42.16	64	3.68
2	1-1/2	60.33	48.26	76	3.91
2-1/2	2	73.03	60.33	89	5.16
3	2-1/2	88.90	73.03	102	5.49
3-1/2	3	101.60	88.90	115	5.74
4	3-1/2	114.30	101.60	127	6.02
5	4	141.30	114.30	152	6.55
6	5	168.28	141.30	178	7.11
8	6	219.08	168.28	203	8.18
10	8	273.05	219.08	254	9.27
12	10	323.85	273.05	305	9.53
14	12	355.60	323.85	356	9.53
16	14	406.40	355.60	406	9.53
18	16	457.20	406.40	457	9.53
20	18	508.00	457.20	508	9.53
24	20	609.60	508.00	610	9.53

Notes:

NPS (Nominal Pipe Size): Nominal size of the pipe.
D1 (Outside Diameter of Large End): Outside diameter of the large end.
D2 (Outside Diameter of Small End): Outside diameter of the small end.
H (Height): Overall length of the reducer.
T (Thickness): Wall thickness.

Material Summary for Eccentric Reducers

Material Type	Material Grade/ Standard	Applications
Carbon Steel	ASTM A234 WPB, WPC	Oil, gas, water, steam pipelines
	ASTM A105	High temperature and pressure applications
Stainless Steel	ASTM A403 WP304, WP304L, WP316, WP316L	Chemical, food, pharmaceutical, potable water systems
	ASTM A182 F304, F304L, F316, F316L	High corrosion resistance applications
Alloy Steel	ASTM A335 P11, P22, P5, P9	High temperature and pressure applications, boilers, power plants
	ASTM A182 F1, F5, F9, F11, F22	High temperature applications
Special Alloys	Inconel (Alloy 600, 625, 718)	High corrosion, high temperature, aerospace applications
	Monel (Alloy 400, K500)	Marine, chemical environments
	Hastelloy (C276, C22)	Chemical, waste treatment, chemical plants
Other Materials	Copper	Potable water systems, cooling systems
	Aluminum	Lightweight, corrosion-resistant applications
	Plastics (PVC, CPVC, PP, PVDF)	Wastewater, light chemical handling systems

Notes:

ASTM (American Society for Testing and Materials): International standards organization.
Corrosion Resistance: Materials like stainless steel and special alloys such as Inconel, Monel, and Hastelloy are widely used in highly corrosive environments.
High Temperature: Alloy steels and special alloys are commonly used in applications requiring high temperature resistance.
Carbon Steel: Widely used in oil, gas, and water systems for its cost-effectiveness and versatility.

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