GOST 17378 Concentric & Eccentric Reducers – Steel Pipe Fittings Supplier

GOST 17378 concentric and eccentric reducers are essential steel pipe fittings used to connect pipes of different diameters in industrial pipeline systems. Manufactured in accordance with the GOST 17378 standard, these reducers ensure precise dimensions, high strength, and reliable performance in demanding environments such as oil & gas, petrochemical, power plants, and water treatment facilities.

As a professional supplier of GOST pipe fittings, we provide high-quality reducers in various sizes, materials, and specifications to meet global project requirements.

What Are GOST 17378 Concentric & Eccentric Reducers?

GOST 17378 reducers are butt weld fittings designed to change pipe diameter, ensuring smooth flow transition and pressure control within a pipeline.

🔹 Concentric Reducers

Concentric reducers have a symmetrical cone shape where the centerlines of both ends align. They are commonly used in vertical pipelines or systems where flow symmetry is required.

Key benefits:

Smooth and uniform flow

• Reduced turbulence
• Ideal for vertical piping systems

🔹 Eccentric Reducers

Eccentric reducers feature an offset design with one side flat. They are typically used in horizontal pipelines to avoid air pockets or liquid accumulation.

Key benefits:

• Prevents air entrapment
• Reduces cavitation risk in pump systems
• Ensures stable fluid flow

Key Features of GOST 17378 Reducers

• Manufactured according to GOST 17378-2001 / updated standards
• Available in seamless and welded types
• High strength and excellent weldability
• Resistant to pressure, temperature, and corrosion
• Accurate dimensions for easy installation
• Wide size and thickness range

Materials for GOST 17378 Steel Reducers

Our reducers are available in a variety of materials to suit different applications:

Carbon Steel:

• 10, 20 (Ст20)
• Cost-effective and widely used

Low-Alloy Steel:

• 09G2S, 16GS, 17GS
• Suitable for low temperature and high-pressure conditions

Stainless Steel:

• 304 / 304L
• 316 / 316L
• 321

These materials ensure durability, corrosion resistance, and long service life.

Technical Specifications

• Standard: GOST 17378
• Type: Concentric & Eccentric reducers
• Size Range: DN15 – DN1200
• Wall Thickness: SCH10 – SCH160
• Connection Type: Butt weld
• Manufacturing: Seamless / Welded

Surface treatments:

• Black painting
• Anti-rust oil

Applications of GOST 17378 Reducers

GOST reducers are widely used in:

• Oil and gas pipelines
• Petrochemical and chemical industries
• Power generation systems
• Water supply and wastewater treatment
• Industrial piping systems

They play a critical role in maintaining flow efficiency and system reliability.

Related GOST Pipe Fittings

GOST 17378 reducers are commonly used together with:

• GOST 17375 – Elbows
• GOST 17376 – Tees
• GOST 17379 – Pipe end caps
• GOST 17380 – General technical requirements