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.
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.
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.
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.
Standard | Description | Common Grades | Applications |
ASME/ANSI B16.9 | Covers 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 B16.11 | Covers 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 B16.28 | Specifies 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/A234M | Standard 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/A403M | Covers wrought austenitic stainless steel fittings, including concentric reducers. | WP304, WP304L, WP316, WP316L | High corrosion resistance; food processing, chemical industries |
ASTM A420/A420M | Standard for low-temperature carbon steel fittings, including reducers. | Low-temperature carbon steel grades | Cryogenic applications |
ASTM A815/A815M | Covers wrought ferritic, austenitic, and duplex stainless steel fittings. | UNS S31803 (duplex), UNS S32750 (super duplex) | High corrosion resistance; marine, chemical industries |
MSS SP-43 | Covers wrought stainless steel butt-welding fittings, including concentric reducers. | WP304, WP304L, WP316, WP316L | Low-pressure systems |
MSS SP-75 | Specifies high-test, wrought, butt-welding fittings, including reducers. | WPB (carbon steel), WP11, WP22, WP91 (alloy steels) | High-pressure and high-temperature applications |
MSS SP-79 | Covers socket-welding reducers for small-diameter pipes. | WPB (carbon steel), WP11, WP22, WP91 (alloy steels) | Small-diameter pipes |
MSS SP-95 | Standard for swage(d) nipples and reducers. | WPB (carbon steel), WP11, WP22, WP91 (alloy steels) | Various industrial applications |
EN 10253 | Covers butt-welding pipe fittings, including concentric reducers. | Part 1: Non-alloy steel fittings; Part 2: Alloy and stainless steel fittings | European piping systems |
EN 10241 | Specifies threaded steel fittings, including reducers. | Various steel grades | European piping systems |
EN 1092-1 | Covers flanges and flanged fittings, including flanged reducers. | Various steel grades | European piping systems |
ISO 4144 | Specifies dimensions and materials for stainless steel threaded fittings, including reducers. | Various stainless steel grades | International applications |
ISO 5251 | Covers stainless steel butt-welding fittings, including reducers. | Various stainless steel grades | International applications |
DIN 2616 | Covers butt-welding fittings, including concentric reducers. | Various steel grades | European piping systems |
DIN 2605 | Specifies dimensions and materials for steel butt-welding reducers. | Various steel grades | European piping systems |
JIS B2311 | Covers general-purpose steel butt-welding fittings, including reducers. | Various steel grades | Japanese piping systems |
JIS B2312 | Specifies stainless steel butt-welding fittings, including reducers. | Various stainless steel grades | Japanese piping systems |
JIS B2313 | Covers socket-welding fittings, including reducers. | Various steel grades | Japanese piping systems |
GOST 17378 | Covers steel butt-welding fittings, including reducers. | Various steel grades | Russian and CIS countries |
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).
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.