GOST 34233.6-2017 PDF

Full title and description

GOST 34233.6-2017 — "Vessels and apparatus. Norms and methods of strength calculation. Strength calculation under low-cyclic loads". The standard provides rules, calculation methods and normative values for assessing the strength of pressure vessels and process apparatus that operate under low-cycle (repeated but limited-number) mechanical and thermal loading in chemical, petrochemical, oil & gas and related industries.

Abstract

This interstate (GOST) standard specifies methods for strength calculation of vessels and apparatus subjected to low-cycle loading (including combined pressure, thermal constraint and other load types) for service lives where the total number of loading cycles does not exceed 1·10^6. It sets out required material and weld considerations, permissible stresses and safety factors, fatigue and low-cycle stability assessment procedures, and rules for documenting computerized strength calculations.

General information

• Status: Active — introduced for the first time (national adoption as a GOST standard).
• Publication date: Adopted by decision 14 December 2017; introduced into force as a national standard of the Russian Federation on 1 August 2018.
• Publisher: Interstate standard (GOST series); introduced as a national standard by the Federal Agency for Technical Regulation and Metrology (Rosstandart) by order N 1994‑ст.
• ICS / categories: 71.120 (Equipment for chemical industry); 75.200 (Equipment for oil refining, oil products and natural gas).
• Edition / version: GOST 34233.6-2017 (first edition, 2017).
• Number of pages: ~24–25 pages (published electronic/printed text editions list 24–25 pages depending on publisher).

Scope

The standard applies to strength calculations of vessels and apparatus used in chemical, petrochemical, oil & gas and related industries that operate under repeated (low-cycle) loads from internal pressure, mechanical and thermal constraint and other load combinations, for which the total number of loading cycles over the service life does not exceed 1·10^6. It is intended to be used where geometric deviations and manufacturing inaccuracies of calculated elements remain within the tolerances set by relevant regulatory documents.

Key topics and requirements

• Definitions and classification of low-cycle loading scenarios for vessels and apparatus.
• Permissible stresses and safety factors specific to low-cycle (high-strain) conditions.
• Methods for fatigue and low-cycle strength calculation, including cumulative damage assessment for limited-cycle service life.
• Consideration of thermal constraint, temperature-induced stresses and their interaction with pressure loading.
• Material properties and weld/joint provisions required for low-cycle strength assessments.
• Rules and recommended form for presentation of computerized strength calculation results.
• Normative references and alignment with relevant international standards (the text was prepared taking into account existing ISO provisions where appropriate).

Typical use and users

Primary users are mechanical and pressure-vessel design engineers, project engineers in chemical and oil & gas industries, strength analysts, inspection and certification bodies, equipment manufacturers and technical regulators. The standard is used when designing, verifying or re-assessing pressure vessels, reactors, heat exchangers and other process apparatus expected to experience limited numbers of high-amplitude load cycles during service.

Related standards

GOST 34233.6-2017 is one part of the GOST 34233 "Vessels and apparatus. Norms and methods of strength calculation" series (other parts include GOST 34233.1,.2,.7,.8,.9,.10,.11,.12, etc.). It replaces or updates earlier national documents in this topic area (for example it superseded elements of GOST R 52857.6-2007 on introduction). The series is commonly applied alongside national technical regulations for pressure equipment and relevant ISO standards referenced in the prefatory notes.

Keywords

pressure vessels; process apparatus; low-cycle loads; fatigue; strength calculation; thermal constraint; permissible stresses; petrochemical equipment; GOST 34233; pressure equipment design.

FAQ

Q: What is this standard?

A: It is GOST 34233.6-2017, an interstate/national standard that defines norms and methods for strength calculation of vessels and apparatus under low-cycle (limited-number repeated) loads.

Q: What does it cover?

A: Calculation procedures for strength and low-cycle fatigue assessment, permissible stresses and safety factors, material and weld considerations, combined pressure and thermal load effects, and requirements for presenting computerized calculation results for vessels and apparatus with a total number of load cycles up to about 1·10^6.

Q: Who typically uses it?

A: Design and calculation engineers for pressure equipment, manufacturers, inspection and certification bodies, and technical regulators in chemical, petrochemical, oil & gas and related industries.

Q: Is it current or superseded?

A: It was adopted in December 2017 and came into force on 1 August 2018; it is an active standard and has recorded amendments/corrections published in the national IUS bulletins (examples include notices in 2019, 2021 and 2023), so users should consult the latest national amendments when applying it.

Q: Is it part of a series?

A: Yes — it is part 6 of the GOST 34233 series covering strength calculation norms and methods for vessels and apparatus (other parts of the series address shells, heads, heat exchangers, columns, H2S service, computerized calculation reporting, etc.).

Q: What are the key keywords?

A: Pressure vessels, low-cycle loads, fatigue, strength calculation, thermal constraint, petrochemical equipment, GOST 34233.