GOST 28759.4-90 PDF

Full title and description

GOST 28759.4-90 — "Flanges of vessels and apparatus, steel, butt welded for gasket of octagonal section. Design and dimensions." This national/interstate standard specifies the construction and dimensional parameters for steel butt-weld flanges used with octagonal-section gaskets on pressure vessels and apparatus.

Abstract

GOST 28759.4-90 defines geometry, principal dimensions and basic design features of steel butt-weld flanges intended for installation on vessels and apparatus where an octagonal-section gasket is used. The standard covers typical internal diameters, nominal pressure ratings and two common executions of the flange design, and includes reference mass tables and dimensional charts. The original document has been superseded by a consolidated 2022 edition.

General information

• Status: Replaced / superseded (withdrawn and replaced by a 2022 edition).
• Publication date: Original entry into force 1992-01-01 (designation -90 indicates 1990 origin); withdrawn/replaced effective 2022-07-01.
• Publisher: Interstate standard (Межгосударственный стандарт) — originally approved by the USSR standards authority; later maintained/republished under the interstate / national standards system.
• ICS / categories: Pressure vessels and flanges; related classification marks given in available catalogs include OKS/МКС 71.120 (chemical equipment / pressure equipment) and related petroleum / gas industry subcategories.
• Edition / version: GOST 28759.4-90 (original); replaced by GOST 28759.4-2022 (effective 01 July 2022).
• Number of pages: Original GOST 28759.4-90: 5 pages (catalog listings); Replacement GOST 28759.4-2022: ~12 pages.

Scope

This standard applies to steel butt-weld flanges for vessels and apparatus designed to use octagonal-section gaskets. It covers flanges for internal diameters typically in the 400–1600 mm range, intended for nominal pressures of 6.3, 8.0, 10.0 and 16.0 MPa and for operation at temperatures up to approximately 540 °C. The flanges are intended for chemical, petrochemical, oil & gas and related industrial applications. (See the 2022 revision for the currently active dimensional tables and additional requirements.)

Key topics and requirements

• Definition of flange types/executions (commonly two executions) and principal dimensions for octagonal-section gasket seats.
• Dimensional tables for internal diameters (approx. 400–1600 mm) and associated flange outside/bolt circle/bolt hole details.
• Nominal pressure ratings covered: 6.3, 8.0, 10.0, 16.0 MPa and temperature suitability (up to ≈540 °C).
• Reference mass (weight) tables for typical flange sizes and pressures (provided in annexes/tables).
• Requirements for flange skirt (weld neck) geometry to enable butt welding to vessel necks and for sufficient mechanical strength.
• Cross-references to other GOST standards for gasket selection, flange manufacturing and testing (series references such as other parts of GOST 28759 and related GOSTs).

Typical use and users

Manufacturers and fabricators of pressure vessels and apparatus, flange producers, piping and equipment engineers in chemical, petrochemical, oil & gas and process industries, procurement specialists specifying flange types for pressure equipment, and standards/quality engineers verifying dimensional interchangeability and compliance. Engineers use the standard to select flange geometry, bolt patterns and materials compatible with octagonal gaskets.

Related standards

Related documents and series entries include other parts of the GOST 28759 set (for flanges, gaskets and mating components), GOST 28759.5 / 28759.7 / 28759.8 (series cross-references in the 2022 revision), national flange standards cited historically such as GOST 12820-80 (flat flanges) and earlier OСТ documents that were replaced. The 2022 edition of GOST 28759.4 supersedes the -90 version and consolidates references to companion parts.

Keywords

GOST 28759.4-90; flanges; butt welded flange; vessel flange; octagonal gasket; flange dimensions; pressure vessels; petrochemical; flange design; replacement GOST 28759.4-2022.

FAQ

Q: What is this standard?

A: GOST 28759.4-90 is an interstate/national standard that specified the design and dimensions of steel butt-weld flanges for vessels and apparatus using octagonal-section gaskets. It provided dimensional tables, execution variants and basic design rules for such flanges.

Q: What does it cover?

A: It covers flange geometry and principal dimensions for butt-weld flanges with octagonal gasket seats — including sizes (internal diameters generally from 400 to 1600 mm in practice), bolt patterns, skirt/weld-neck details, nominal pressures (6.3–16.0 MPa) and related mass/dimension tables. For current dimensional data and any amendments refer to the 2022 revision.

Q: Who typically uses it?

A: Producers of flanges and pressure vessels, piping and mechanical engineers in chemical, petrochemical, oil & gas and process industries, procurement and quality specialists who need standardized flange dimensions for fabrication and interchangeability.

Q: Is it current or superseded?

A: GOST 28759.4-90 has been superseded — the active replacement is GOST 28759.4-2022, which entered into force on 01 July 2022. Users should apply the 2022 edition for current requirements.

Q: Is it part of a series?

A: Yes — it is one part of the GOST 28759 series covering flanges, gaskets and related components for vessels and apparatus; the 2022 consolidated set contains companion parts (e.g., manufacturing and gasket-related parts) referenced from the main document.

Q: What are the key keywords?

A: Flange, butt-weld, vessel, apparatus, octagonal gasket, flange dimensions, nominal pressure, GOST 28759.4-90, GOST 28759.4-2022.