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Concentric Reducer

Concentric reducer is a type of pipe fitting used in plumbing and piping systems to connect two pipes of different sizes while maintaining a common centerline. It has a cone-like shape, with both ends aligned along the same central axis, ensuring a symmetrical and smooth transition for fluid flow. 

What is Concentric Reducer

Concentric reducer is a type of pipe fitting used to join two pipes of different diameters in a straight line. It features a conical shape with a symmetrical design, ensuring that the centerlines of both pipes align perfectly. This alignment allows for a smooth and gradual transition between the larger and smaller pipe sizes, minimizing turbulence and pressure drops in the fluid or gas flow.

Types of Concentric Reducer

Welded Concentric Reducer: Manufactured by welding two pipe sections of different diameters, commonly used in high-pressure systems.


Seamless Concentric Reducer: Made from a single piece of material without seams, ideal for high-pressure and corrosive environments.


Threaded Concentric Reducer: Features threaded ends for easy installation in low-pressure systems.


Flanged Concentric Reducer: Equipped with flanges on both ends for bolted connections, often used in large-diameter piping systems.


Features of Concentric Reducer

Symmetrical Design: The reducer has a symmetrical, tapered shape, ensuring a balanced flow transition.

Flow Efficiency: The aligned centerlines minimize turbulence and pressure drop, promoting efficient fluid or gas movement.

Durability: Made from materials like carbon steel, stainless steel, and alloy steel, concentric reducers are designed to withstand high pressure, temperature, and corrosive environments.

Standards for Concentric Reducer

StandardDescriptionCommon GradesApplications
ASME/ANSI B16.9Covers factory-made wrought steel butt-welding fittings, including concentric reducers.WPB (carbon steel), WP11, WP22, WP91 (alloy steels)High-pressure and high-temperature applications; oil, gas, petrochemical industries
ASME/ANSI B16.11Covers forged steel fittings, including threaded and socket-weld concentric reducers.WPB (carbon steel), WP11, WP22, WP91 (alloy steels)Smaller-diameter pipes; low-to-medium pressure systems
ASME/ANSI B16.28Specifies requirements for wrought steel butt-welding short-radius elbows and returns, including reducers.WPB (carbon steel), WP11, WP22, WP91 (alloy steels)Systems with space constraints
ASTM A234/A234MStandard specification for carbon and alloy steel pipe fittings, including concentric reducers.WPB (carbon steel), WP11, WP22, WP91 (alloy steels)High-pressure and high-temperature applications; oil, gas, petrochemical industries
ASTM A403/A403MCovers wrought austenitic stainless steel fittings, including concentric reducers.WP304, WP304L, WP316, WP316LHigh corrosion resistance; food processing, chemical industries
ASTM A420/A420MStandard for low-temperature carbon steel fittings, including reducers.Low-temperature carbon steel gradesCryogenic applications
ASTM A815/A815MCovers wrought ferritic, austenitic, and duplex stainless steel fittings.UNS S31803 (duplex), UNS S32750 (super duplex)High corrosion resistance; marine, chemical industries
MSS SP-43Covers wrought stainless steel butt-welding fittings, including concentric reducers.WP304, WP304L, WP316, WP316LLow-pressure systems
MSS SP-75Specifies high-test, wrought, butt-welding fittings, including reducers.WPB (carbon steel), WP11, WP22, WP91 (alloy steels)High-pressure and high-temperature applications
MSS SP-79Covers socket-welding reducers for small-diameter pipes.WPB (carbon steel), WP11, WP22, WP91 (alloy steels)Small-diameter pipes
MSS SP-95Standard for swage(d) nipples and reducers.WPB (carbon steel), WP11, WP22, WP91 (alloy steels)Various industrial applications
EN 10253Covers butt-welding pipe fittings, including concentric reducers.Part 1: Non-alloy steel fittings; Part 2: Alloy and stainless steel fittingsEuropean piping systems
EN 10241Specifies threaded steel fittings, including reducers.Various steel gradesEuropean piping systems
EN 1092-1Covers flanges and flanged fittings, including flanged reducers.Various steel gradesEuropean piping systems
ISO 4144Specifies dimensions and materials for stainless steel threaded fittings, including reducers.Various stainless steel gradesInternational applications
ISO 5251Covers stainless steel butt-welding fittings, including reducers.Various stainless steel gradesInternational applications
DIN 2616Covers butt-welding fittings, including concentric reducers.Various steel gradesEuropean piping systems
DIN 2605Specifies dimensions and materials for steel butt-welding reducers.Various steel gradesEuropean piping systems
JIS B2311Covers general-purpose steel butt-welding fittings, including reducers.Various steel gradesJapanese piping systems
JIS B2312Specifies stainless steel butt-welding fittings, including reducers.Various stainless steel gradesJapanese piping systems
JIS B2313Covers socket-welding fittings, including reducers.Various steel gradesJapanese piping systems
GOST 17378Covers steel butt-welding fittings, including reducers.Various steel gradesRussian and CIS countries


Materials of Concentric Reducer

Carbon Steel: Used in general-purpose applications (e.g., ASTM A234 WPB).


Stainless Steel: Ideal for corrosive environments (e.g., ASTM A403 WP304/316).


Alloy Steel: Suitable for high-temperature and high-pressure systems (e.g., ASTM A234 WP11/WP22).


Duplex and Super Duplex Steel: Used in highly corrosive and high-strength applications (e.g., ASTM A815 UNS S31803/S32750).


Nickel Alloys: For extreme conditions, such as high temperatures and corrosive media (e.g., Inconel, Monel).


Applications of Concentric Reducer

Oil and Gas: For pipeline systems transporting crude oil, natural gas, and refined products.


Chemical Processing: In corrosive and high-temperature environments.


Water Treatment: For connecting pipes in water distribution and treatment systems.


HVAC Systems: In heating, ventilation, and air conditioning systems.


Power Generation: In steam and cooling water pipelines.


Pharmaceuticals: For sanitary piping systems requiring smooth flow transitions.


Food and Beverage: In hygienic piping systems for liquid and gas transport.


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