GOST 28759.2-90 PDF

Full title and description

GOST 28759.2-90 — "Steel flat welded flanges of vessels and apparatus. Design and dimensions" (Russian: "Фланцы сосудов и аппаратов стальные плоские приварные. Конструкция и размеры"). The standard specifies the design and dimensional parameters for flat welded flanges used on pressure vessels and process apparatus.

Abstract

This GOST defines types, constructive forms and dimensional series for steel flat weld-on flanges intended for vessels and apparatus with internal diameters generally in the large-size range (commonly from about 400 mm up to 4000 mm). It sets nominal pressure ratings, face types and main dimensional limits to ensure interchangeability for manufacture and assembly in chemical, petrochemical, oil & gas and allied industries. The original GOST 28759.2-90 edition has been replaced by a later edition (GOST 28759.2-2022).

General information

• Status: Withdrawn / superseded — replaced by GOST 28759.2-2022 (active standard as of 01 July 2022).
• Publication date: Designation year 1990 (GOST 28759.2-90); introduced/issued for use from 01 January 1992 in many registries.
• Publisher: National GOST system (state standard / Rosstandart / historically Gosstandart of USSR). The 2022 replacement was approved/issued by Rosstandart.
• ICS / categories: Relevant ICS/MKS areas include equipment for chemical industry and pressure-vessel/pipeline components (examples: MKS/ICS groups such as 71.120 and 75.200 / pipeline and petroleum equipment-related classifications).
• Edition / version: Edition: GOST 28759.2-90 (original edition, 1990); superseded by GOST 28759.2-2022 (published 01 July 2022).
• Number of pages: Original GOST 28759.2-90 — about 13 pages; the 2022 replacement edition is longer (about 24 pages).

Scope

GOST 28759.2-90 covers steel flat weld-on (privarnye) flanges for vessels and apparatus with internal diameters typically from 400 mm up to 4000 mm, for nominal pressures commonly given as 0.3; 0.6; 1.0; and 1.6 MPa, and for service temperatures across a wide range (standards reference various lower/upper temperature limits depending on edition — e.g., commonly cited ranges down to −40…−70 °C and up to ~300 °C depending on material). The standard establishes dimensional series, face types (smooth, with groove, tongue-and-groove, raised lip, etc.), and basic constructive variants used in chemical, petrochemical, oil-refining, gas-processing and related industries.

Key topics and requirements

• Design and dimensional series for flat weld-on flanges (construction rules and main sizes).
• Applicable internal diameters and nominal pressure classes (typical values: Du ≈ 400–4000 mm; Py = 0.3, 0.6, 1.0, 1.6 MPa).
• Permitted face types and sealing surface variants (smooth/flat, recessed/raised, tongue-and-groove, spigot/piloted faces and combinations).
• Material grades and temperature limits — typical steel grades listed; material/temperature-dependent application limits referenced to companion GOST parts.
• Interchangeability and pairing rules (flange pairs, gasket types per related GOSTs, bolting arrangements and basic tolerances).
• Normative references and cross-references to other parts of the GOST 28759 series (e.g., GOST 28759.1, 28759.5, 28759.6 and others).

Typical use and users

Typical users are pressure-vessel designers, mechanical engineers, fabricators and manufacturers of large-diameter vessel and apparatus components, procurement/specification engineers in chemical, petrochemical, oil & gas and refining industries, and inspection/quality personnel ensuring compliance with national flange dimensions and interchangeability. The flanges are used on reactors, columns, drums, heat exchangers and large process vessels.

Related standards

GOST 28759.2-90 is part of a multipart series for vessel/apparatus flanges; related documents include other parts of the GOST 28759 family (for example GOST 28759.1 — general application/limits, GOST 28759.5 — tolerances and geometric deviations, GOST 28759.6 — gaskets/sealing, GOST 28759.11, plus GOST 34347 and later consolidated updates). The current applicable document for the same subject is GOST 28759.2-2022, which formally replaces the 1990 edition.

Keywords

GOST 28759.2-90; steel flanges; flat welded flange; vessel flanges; apparatus flanges; design and dimensions; flange dimensions; petrochemical; chemical industry; pressure vessels; flange standards.

FAQ

Q: What is this standard?

A: GOST 28759.2-90 is a national technical standard that defined the construction and standard dimensions for steel flat weld-on flanges used on vessels and apparatus (large-diameter vessel flanges). It ensured dimensional interchangeability and defined face types and main parameters.

Q: What does it cover?

A: It covers the geometric design, main dimensions and variants of flat welded flanges for vessels and apparatus (typical diameters ~400–4000 mm, nominal pressures such as 0.3–1.6 MPa, and a range of service temperatures). It does not replace detailed material or welding practice rules which are referenced in companion standards.

Q: Who typically uses it?

A: Engineers and designers of pressure vessels and large process equipment, flange manufacturers, procurement/specifiers in chemical and oil & gas industries, and quality/inspection personnel verifying dimensions and interchangeability.

Q: Is it current or superseded?

A: The 1990 edition (GOST 28759.2-90) has been superseded and withdrawn in favor of a newer edition — GOST 28759.2-2022 (introduced 01 July 2022). For current compliance, reference the 2022 edition and any subsequent amendments.

Q: Is it part of a series?

A: Yes — it belongs to the multipart GOST 28759 series (several parts covering different flange types, tolerances, gaskets and related items). The series and its referenced parts should be checked together when specifying or manufacturing flanges.

Q: What are the key keywords?

A: Steel flat welded flange; vessel flange; apparatus flange; design and dimensions; GOST 28759; flange interchangeability; pressure-vessel fittings.