When a piping system needs to connect two different pipe diameters, a reducer provides a smooth transition between them. For projects using Russian GOST standards, GOST 17378 reducers are commonly specified for this purpose.
GOST 17378-2001 covers seamless butt-welding concentric and eccentric reducers made from carbon and low-alloy steel. The standard is widely referenced in industrial piping applications where dimensional requirements and material specifications need to be clearly defined.
What Is a GOST 17378 Reducer?
A GOST 17378 reducer is a seamless butt-welding pipe fitting used to connect pipes with different diameters.
The standard covers two main configurations:
- Concentric reducers
- Eccentric reducers
GOST 17378-2001 applies to reducers manufactured from carbon and low-alloy steel. The fitting is welded directly to the pipe, creating a continuous piping connection.
GOST 17378 Concentric Reducer
A GOST 17378 concentric reducer has a common centerline at both ends. The diameter changes evenly around the center axis.
This design is commonly used where the connected pipes need to remain aligned, particularly in vertical piping and various process piping arrangements.
When ordering a concentric reducer, the specification should normally include:
Large end × small end + wall thickness + material + quantity
For example:
GOST 17378-2001, Concentric Reducer, DN200 × DN150, Carbon Steel, Wall Thickness XX mm, 5000 pcs.
The exact dimensions should be confirmed against the applicable GOST dimensional requirements and the customer’s purchase specification.
GOST 17378 Eccentric Reducer
A GOST 17378 eccentric reducer has an offset centerline. One side of the reducer remains aligned while the other side changes position.
This configuration is useful in horizontal piping where the designer needs to control the position of the pipe centerline or maintain a flat top or bottom arrangement.
The orientation of an eccentric reducer depends on the piping design and service conditions. For this reason, distributors should confirm the required configuration with the engineering drawing or purchase specification rather than selecting it based only on availability.
GOST 17378 Reducer Dimensions
GOST 17378 reducer dimensions are one of the most important points to confirm when purchasing these fittings.
Depending on the specified size, dimensional information can include:
- Large-end outside diameter
- Small-end outside diameter
- Wall thickness
- Overall length
- Material
- Theoretical weight where applicable
A reducer should not be ordered based only on the nominal DN sizes.
For an accurate quotation, buyers should provide:
GOST 17378 + reducer type + DN1 × DN2 + wall thickness + material + quantity
This is particularly important for distributors because a size combination that looks similar may not have the same actual outside diameter or wall thickness.
GOST 17378 Reducer Size
Common purchase requirements may include combinations such as:
- DN50 × DN40
- DN80 × DN50
- DN100 × DN80
- DN150 × DN100
- DN200 × DN150
- DN300 × DN250
GOST 17378 Carbon Steel Reducer Materials
GOST 17378 covers reducers made from carbon and low-alloy steel.
Depending on the project specification, buyers may request grades such as:
- Steel 20 / St20
- Other GOST-specified carbon steel grades
- Low-alloy steel grades required by the project
Material selection should take into account the operating temperature, pressure, medium and applicable project requirements.
For industrial orders, material traceability is also important. Our factory can supply:
- Material certificates
- Heat number traceability
- Chemical composition
- Mechanical properties
- Dimensional inspection reports
- Third-party inspection
Rayoung is a professional GOST 17378 reducer supplier from China.
GOST 17378 vs Other GOST Butt Weld Fittings
GOST 17378 is part of a broader range of GOST butt-welding pipe fittings.
| GOST Standard | Main Fitting |
|---|---|
| GOST 17375 | 3D Elbows |
| GOST 17376 | Tees |
| GOST 17378 | Reducers |
| GOST 17379 | Caps |
For distributors and stockists, sourcing these products from one supplier can simplify purchasing, documentation and shipment management.
You can also explore our related GOST 17375 elbows, GOST 17376 tees, and GOST 17379 caps to build a complete GOST butt weld fitting range.
How to Choose GOST 17378 Reducers for Your Stock
For a distributor or stockist, the right reducer is not necessarily the cheapest one. Consistent dimensions, reliable documentation and repeat supply are often more important for maintaining warehouse inventory.
Before placing an order, check the following:
1. Reducer Type
Confirm whether you need a concentric or eccentric reducer.
2. Size
Specify both ends clearly, such as DN200 × DN150.
3. Wall Thickness
Do not assume that the reducer wall thickness will automatically match the connected pipe.
4. Material
Specify the required carbon or low-alloy steel grade.
5. Quantity
For stock orders, provide the required quantity by size so the supplier can plan production and packing efficiently.
6. Inspection and Documents
Confirm whether MTCs, dimensional reports or third-party inspection are required.
GOST 17378 Reducers Manufacturer for Distributors and Stockists
For wholesale buyers, availability across multiple sizes can be more valuable than a single low-priced item.
Rayoung is a reliable Chinese GOST 17378 reducer supplier, and we can support:
- Multiple size combinations
- Mixed-size orders
- Repeat purchasing
- Material traceability
- Consistent dimensions
- Export packaging
- Project-specific inspection
- Stable delivery schedules
Email: info@hb-steel.com
Whats App: 008618003119682
Frequently Asked Questions
What is GOST 17378?
GOST 17378-2001 is a standard covering seamless butt-welding concentric and eccentric reducers made from carbon and low-alloy steel.
Is GOST 17378 reducer seamless?
Yes. GOST 17378-2001 covers seamless butt-welding reducers.
What types of GOST 17378 reducers are available?
The standard covers concentric and eccentric reducers.
What is a GOST 17378 concentric reducer?
It is a reducer in which the large and small ends share the same centerline.
What is a GOST 17378 eccentric reducer?
It is a reducer with an offset centerline, allowing one side of the fitting to remain aligned.
What material is used for GOST 17378 reducers?
The standard covers carbon and low-alloy steel. The exact grade should be specified according to the project or purchase order.
What information is needed to quote a GOST 17378 reducer?
The most useful information is:
Standard + type + size + wall thickness + material + quantity + inspection requirements.
Need GOST 17378 Reducers for Stock or Project Supply?
RAYOUNG supplies GOST 17378 carbon steel seamless reducers for distributors, stockists, trading companies, EPC contractors and industrial buyers.
Whether you need GOST 17378 concentric reducers, eccentric reducers or mixed-size orders, send us your required specifications and quantity.
Size | Type | Wall Thickness | Material | Quantity | Inspection
We can review your requirements and provide a suitable quotation for your project or warehouse stock.