GOST 12.2.085-2017 PDF

Full title and description

GOST 12.2.085-2017 — Pipeline valves. Safety valves. Selection and calculation of capacity. This interstate (GOST) standard establishes terminology and requirements for selecting and calculating the throughput (capacity) of safety (relief) valves used to protect pressure equipment, pipelines, boilers and vessels against emergency overpressure by discharging process fluid through the valve.

Abstract

This standard specifies general rules for choosing safety valves and for calculating their required capacity for a range of media (gases, vapours, liquids, two‑phase flows) and operating conditions. It sets requirements for the parameters and data to be used in calculations, gives formulae and correction factors where appropriate, and defines documentation and marking expectations to ensure safe overpressure protection of equipment operating above 0.05 MPa (0.5 bar).

General information

• Status: Active / in force (replaces earlier editions of the same GOST series).
• Publication date: Introduced/implemented 01 November 2018 (registration/registration activity from 2017; published in 2018).
• Publisher: Federal Agency for Technical Regulation and Metrology (Rosstandart) / Russian national standards bodies (commercial distributions and translators publish English copies).
• ICS / categories: ICS 23.060 — Valves (fluid systems and components for general use); related classification entry 23.060.50 (valves/check valves) is relevant to valve standards.
• Edition / version: Edition dated 2017 (designated GOST 12.2.085-2017).
• Number of pages: Approximately 70–72 pages depending on publisher/format and translated editions.

Scope

The standard applies to safety (relief) valves intended to protect equipment (vessels, boilers, pipelines and similar apparatus) operating at excess pressures greater than 0.05 MPa (0.5 bar) by releasing the process medium through the valve. It establishes the general requirements for selection and calculation of valve throughput (capacity), data and boundary conditions to be used in sizing, and includes provisions that distinguish media types and flow regimes for calculation methods.

Key topics and requirements

• Definitions and classification of safety (relief) valves used on pipelines and pressure equipment.
• Requirements on selection criteria: set pressure, allowable overpressure, seat tightness class and installation considerations.
• Calculation methods for discharge capacity for different media — liquids, gases, vapours and two‑phase flows — including recommended formulae and correction factors.
• Required input data (process conditions, thermophysical properties, upstream/downstream piping effects) and recommended assumptions when data are incomplete.
• Testing, verification and documentation: capacity verification, marking, certificate and manufacturer documentation requirements.
• Notes on limitations and cases requiring special engineering analysis (e.g., flashing liquids, two‑phase flow, unusual piping geometry).

Typical use and users

Engineers and designers of pressure equipment and piping systems, process safety engineers, valve manufacturers and testing laboratories, inspection and certification bodies, plant operation and maintenance personnel, and regulatory authorities use this standard when selecting, sizing, documenting and verifying safety valves for industrial installations (oil & gas, chemical, power generation, water and steam systems). It is also referenced by technical regulators and by organizations that perform conformity assessment of pressure equipment.

Related standards

GOST 12.2.085-2017 is connected with earlier national GOST editions (it replaces GOST 12.2.085-2002 / earlier versions) and references other normative documents on strength calculation and safety of pressure equipment. Internationally comparable or related documents include standards on safety devices for protection against excessive pressure (for example ISO/EN documents and common industry practice such as API sizing guidance).

Keywords

safety valve; relief valve; pipeline valves; valve capacity; throughput calculation; overpressure protection; pressure equipment; valve selection; GOST; Rosstandart; discharge capacity; two‑phase flow.

FAQ

Q: What is this standard?

A: GOST 12.2.085-2017 is a Russian (interstate) standard that specifies rules and methods for selection and calculation of the discharge capacity of safety (relief) valves used to protect pressure equipment and pipelines from excessive pressure.

Q: What does it cover?

A: It covers scope and applicability (equipment operating above 0.05 MPa), required input data and assumptions, calculation procedures for different media and flow regimes, and rules for documentation, marking and verification of valve capacity for safe overpressure protection.

Q: Who typically uses it?

A: Process and mechanical engineers, valve manufacturers, testing and certification bodies, inspection authorities, plant operators and maintenance staff responsible for pressure‑relief systems across industry sectors such as oil & gas, petrochemical, power and utilities.

Q: Is it current or superseded?

A: As published it is designated GOST 12.2.085-2017 and was introduced in 2018; it replaces earlier national editions of the same GOST (e.g., the 2002 edition). Users should check national registries or the issuing body for later amendments or revisions before final application.

Q: Is it part of a series?

A: Yes — it belongs to the system of labour safety / pressure equipment and valve standards within the GOST family and is associated with other standards covering valve safety, strength calculation of pressure equipment and related test methods.

Q: What are the key keywords?

A: Safety valve, relief valve, throughput (capacity) calculation, valve selection, pipeline valves, overpressure protection, pressure equipment, discharge capacity.