Butt Weld Reducer Manufacturer | B16.9 DIN GOST 17378 Concentric Reducer Eccentric Reducer
Butt weld reducers are pipe fittings used to connect pipes of different diameters in industrial piping systems. Manufactured according to ASME B16.9, MSS SP 75 , EN 10253 , and GOST 17378 standards, they are available in carbon steel, stainless steel, and alloy steel for various industrial applications.
Butt Weld Reducer Manufacturer and Supplier
Butt weld reducers are important pipe fittings used to connect pipes of different diameters in industrial piping systems. They help control flow rate, maintain pressure balance, and ensure efficient fluid transportation throughout the pipeline network. Compared with threaded or socket weld fittings, butt weld reducers provide stronger connections, better structural integrity, and improved reliability for high-pressure applications.
These fittings are widely used in industries such as oil and gas, petrochemical processing, power generation, water treatment, and shipbuilding. Butt weld reducers are manufactured according to international piping standards including ASME B16.9, MSS SP, EN standards, and GOST standards, ensuring compatibility with global industrial pipeline systems.
As a professional pipe fittings manufacturer and supplier, we provide a complete range of butt weld reducers in carbon steel, stainless steel, and alloy steel, available in various sizes and wall thicknesses to meet different engineering requirements.
Types of Butt Weld Reducers
Butt weld pipe reducers are mainly divided into two types based on their shape and application.
Concentric Reducer
A concentric reducer has a symmetrical conical shape where the centerlines of both pipe ends remain aligned. This type of reducer is commonly used in vertical pipelines or systems where maintaining a uniform centerline is important.
Concentric reducers are widely used in:
-
Oil and gas pipelines
-
Pump suction and discharge lines
-
Industrial process piping systems
Eccentric Reducer
An eccentric reducer has one flat side where the centerlines of the pipes are offset. This design helps prevent air accumulation in pipelines and maintains smooth fluid flow.
Eccentric reducers are commonly used in:
-
Horizontal piping systems
-
Pump installations
-
Pipeline systems requiring constant bottom alignment
Standards for Butt Weld Reducers
Butt weld reducers are manufactured according to internationally recognized standards to ensure dimensional accuracy and compatibility with industrial piping systems.
Common standards include:
-
ASME B16.9 – Factory-made wrought butt welding fittings
-
MSS SP-75 – High-test wrought butt welding fittings
-
EN 10253 – European butt welding fittings standard
-
GOST 17378 – Steel butt weld reducers used in Russia and CIS countries
These standards specify the dimensions, tolerances, and manufacturing requirements for butt weld pipe fittings.
Materials of Butt Weld Reducers
Butt weld reducers are produced in a variety of materials depending on operating conditions such as pressure, temperature, and corrosion environment.
Carbon Steel Reducers
Carbon steel reducers are widely used in general industrial piping systems.
Typical grades include:
-
ASTM A234 WPB
-
ASTM A420 WPL6
-
ASTM A860
These materials provide excellent strength and durability for oil and gas pipelines and industrial fluid systems.
Stainless Steel Reducers
Stainless steel reducers offer superior corrosion resistance and long service life.
Common grades include:
-
ASTM A403 WP304 / WP304L
-
ASTM A403 WP316 / WP316L
-
ASTM A403 WP321
They are widely used in chemical processing, pharmaceutical production, and food industry pipelines.
Alloy Steel Reducers
Alloy steel reducers are designed for high-temperature and high-pressure applications.
Typical grades include:
-
ASTM A234 WP11
-
ASTM A234 WP22
-
ASTM A234 WP91
These fittings are commonly used in power plants, refineries, and high-temperature steam pipelines.
Size Range and Specifications
Butt weld reducers are available in a wide range of sizes to accommodate different pipeline requirements.
Typical specifications include:
-
Size range: 1/2 inch to 72 inch
-
Wall thickness: SCH 10 to SCH 160 / XXS
-
Type: Concentric reducer / Eccentric reducer
-
Connection type: Butt weld
All fittings undergo strict dimensional inspection and quality testing before shipment to ensure compliance with international standards.
Applications of Butt Weld Reducers
Butt weld reducers are widely used in many industrial sectors due to their strength, durability, and reliable welded connection.
Typical applications include:
-
Oil and gas transmission pipelines
-
Petrochemical processing plants
-
Power generation systems
-
Shipbuilding industry
-
Chemical processing facilities
-
Water treatment plants
Their welded structure ensures leak-proof performance and long service life in demanding industrial environments.
Frequently Asked Questions
What is a butt weld reducer?
A butt weld reducer is a pipe fitting used to connect two pipes of different diameters. It is welded directly to the pipe to form a strong and permanent connection.
What is the difference between concentric and eccentric reducers?
The difference lies in the alignment of the pipe centerlines.
-
Concentric reducer – centerlines are aligned
-
Eccentric reducer – centerlines are offset
Eccentric reducers are often used in horizontal pipelines to prevent air accumulation.
What standards are butt weld reducers manufactured to?
Most butt weld reducers are produced according to ASME B16.9, with additional standards such as MSS SP, EN 10253, and GOST 17378 depending on project requirements.
In addition to butt weld reducers, we also supply a full range of butt weld pipe fittings, including
