GOST 17378 Reducer Manufacturer
We are a trusted manufacturer, stockist, and exporter of GOST 17378 Reducers, supplying high-quality concentric and eccentric reducers designed according to the Russian GOST 17378-2001 standard.
Our reducers are used for connecting pipes of different diameters in oil & gas, petrochemical, power, and shipbuilding industries, ensuring smooth flow transition and mechanical strength under high pressure and temperature.
GOST 17378 is a Russian standard that defines the specifications for concentric and eccentric reducers used in piping systems. These are typically butt-welded fittings used to connect pipes of different diameters, similar to reducers found in ASME/ANSI or DIN standards.
Reducer also called Transitions,A pipe reducer is a type of pipe fitting used in piping systems to connect two pipes of different diameters.
Product Types:
- Concentric reducer: Centerline remains consistent
- Eccentric reducer: One side is flat (used to maintain bottom/top alignment in horizontal piping)
GOST 17378 reducer Specifications:
| Parameter | Description |
|---|---|
| Standard | GOST 17378-2001 (latest revision) |
| Type | Butt-welded reducer (eccentric or concentric) |
| Materials | Carbon steel, alloy steel, stainless steel (based on GOST, TU, or customer spec) CT20,09G2S 12Х1МФ, 15Х5М, 10CrMo9-10 304, 304L, 316, 316L, 321, 347, 08Х18Н10, 10Х18Н10Т, 12Х18Н10Т, 20Х23Н13, 10Х17Н13М2Т, etc. |
| Sizes | DN 15 to DN 1000 (commonly) |
GOST 17378-01
Dowload the gost 17378 standard pdf
This standard applies to seamless welded concentric and eccentric transitions from carbon and low – alloy steel.
The scope of application of the transitions is in accordance with Section 1 of GOST 17380.
GOST 17378 Dimension
• Concentric transition of execution 1 D = 508 mm, T = 11 mm and D1 = 406.4 mm, T1 = 8.8 mm from steel grade 20:
Transition K 1-508×11-406.4×8.8 GOST 17378-01,
• the same, from steel 09G2S, for pipelines controlled by supervisory authorities:
Transition PC 1-508×11-406,4×8, 8-09G2S GOST 17378-01,
• eccentric transition of execution 2 D = 530 mm, T = 26 mm and D1 = 377 mm, T1 = 22 mm from steel grade 20:
Transition E 530×26-377×22 GOST 17378-01.
GOST Standards for Fittings
GOST 17375-2001 Butt-welding pipe fittings
GOST 17376 Butt welding Tee
GOST 17378 reducer
Gost 17379 elliptical pipe caps
