GOST 356-80 PDF

Full title and description

GOST 356-80 — Valves and parts of pipe-lines. Nominal, test and operational (working) pressures. Series. The standard defines series (sets) of nominal (rated), test and allowable working pressures for pipeline fittings and valves (tees, elbows, bends, transitions, flanges, and similar items) used in industrial piping systems.

Abstract

GOST 356-80 establishes standardized pressure classes and corresponding test and working pressures for a wide range of pipeline fittings and components. It provides tabulated series of nominal pressures and prescribes how to determine test pressures and allowable working pressures for different materials and temperature conditions. The document is used to ensure compatibility and safety of piping components across industrial applications.

General information

• Status: In force / active (with subsequent amendment(s) and a correction published in 2024).
• Publication date: Approved 29 January 1980; effective from 1 January 1981 (introduced into force on Russian territory with administrative action 1 January 2011).
• Publisher: Originally Gosstandart (USSR); currently maintained/entered in the Russian standards registry under the authority of Rosstandart.
• ICS / categories: Pipelines and their components; classification corresponds to ICS 23.040 (hydraulic and pneumatic systems and components of general purpose).
• Edition / version: Original designation GOST 356-80 (1980); includes at least Amendment No.1 and later editorial corrections (see registry notes).
• Number of pages: Approximately 20–21 pages depending on the published copy / language edition.

Scope

The standard applies to valves and pipeline fittings (including tees, elbows, bends, transitions, flanges and similar details) and defines the series of nominal (rated), test and working pressures to be used when specifying, testing and selecting such components. It does not apply to assembled pipelines as a whole, nor to items covered by specialized nuclear or other sector-specific safety regulations.

Key topics and requirements

• Definition of nominal (rated) pressure classes (pressure series) for fittings and valves.
• Specification of corresponding test (hydrostatic) pressures for verification and acceptance.
• Allowed working pressures as a function of material and maximum operating temperature (tables for different metals and alloys, including special entries for titanium alloys in amended text).
• Application rules and exclusions — which types of fittings and systems are covered and which are excluded (e.g., certain nuclear equipment and specialized hydraulic systems).
• Guidance for selecting pressure classes to ensure interchangeability and safe operation under temperature and material constraints.

Typical use and users

Engineers and designers of industrial piping systems, manufacturers of valves and pipeline fittings, quality and test laboratories, procurement specialists, and regulatory/compliance personnel use GOST 356-80 when specifying pressure classes, preparing test regimes, and verifying that components meet required pressure ratings for a given material and operating temperature. It is commonly referenced in petrochemical, power generation, heating, water supply and general process industries across countries using GOST-derived standards.

Related standards

GOST 356-80 replaced the earlier GOST 356-68. It is commonly used alongside other GOST standards governing specific component dimensions, flange connections and valve types (for example, later standards on valve face-to-face dimensions and flange tables). Subsequent and related standards referenced in practice include national standards for particular valve types and sealing materials (e.g., standards introduced in the 1990s that address valve nominal pressures and dimensions).

Keywords

GOST 356-80, pipeline fittings, valves, nominal pressure, test pressure, working pressure, pressure series, pressure ratings, flanges, tees, elbows, pressure tables.

FAQ

Q: What is this standard?

A: GOST 356-80 is a Soviet-era (1980) state standard titled "Valves and parts of pipe-lines. Nominal, test and operational pressures. Series" that defines standardized pressure classes and associated test and working pressures for pipeline fittings and valves.

Q: What does it cover?

A: It covers the assignment of nominal (rated) pressures, the corresponding test pressures used for verification (for example hydrostatic tests), and allowable working pressures for fittings and valves, including temperature-dependent working pressure tables for various materials. It excludes assembled pipelines and items subject to special nuclear or sector-specific safety rules.

Q: Who typically uses it?

A: Piping designers and engineers, valve and fitting manufacturers, testing laboratories, procurement and quality assurance teams, and regulatory bodies in jurisdictions that reference or adopt GOST standards. It is used across process industries where standardized pressure ratings are required.

Q: Is it current or superseded?

A: GOST 356-80 is listed as active (in force) in current registries; it has been included in the Russian standards registry and has at least one amendment and editorial corrections recorded (administrative actions noted up to 2024). Users should consult the latest registry entry or the authorized text to confirm any amendments or corrigenda before application.

Q: Is it part of a series?

A: The standard itself defines a series (sets) of pressure classes for fittings and valves; administratively it is one in a family of GOST documents covering pipeline components, dimensions and testing. It replaced an earlier edition (GOST 356-68) and is often used alongside other GOSTs addressing specific component types.

Q: What are the key keywords?

A: Nominal pressure, test pressure, working (operational) pressure, pressure series, valves, pipeline fittings, flanges, pressure ratings.