VSN 64-86 PDF

Full title and description

VSN 64-86 (ВСН 64-86) — Methodical guidelines for the installation of detectors and gas analyzers to monitor pre‑explosive (combustible) and maximum permissible concentrations of chemical substances in the air of industrial premises. The document gives technical and placement recommendations for automatic detection and alarm systems used in chemical and other industrial plants with explosion‑ or fire‑hazardous atmospheres.

Abstract

These methodical guidelines set out mandatory recommendations for design, siting and use of gas and combustible‑atmosphere detectors and gas‑analysis sampling points in industrial premises. The guidance covers which rooms and process areas require automatic monitoring, where sampling points and sensors should be located vertically and horizontally (taking into account gas density and likely leak sources), recommended alarm placement and circuiting, and basic technical requirements for systems used to detect both explosive concentrations and concentrations that exceed occupational maximum permissible limits.

General information

• Status: Active / in force (document retained as departmental guidance and available in regulatory databases).
• Publication date: Introduced 1 July 1986; approved by the Ministry of Chemical Industry (order dated 21 March 1986).
• Publisher: Issued as departmental norms under the Ministry of Chemical Industry of the USSR (Минхимпром); developed by the All‑Union Research Institute of Safety Engineering in the Chemical Industry (authors and contributors listed in the document).
• ICS / categories: Industrial safety; gas detection and analysis; explosion protection; occupational hygiene and environmental monitoring.
• Edition / version: Original issue 1986; document entries in national/regulatory databases show updates/registry activity and retention through database updates (records refreshed up to 2020–2021).
• Number of pages: Short technical guidance — published copies and database records indicate approximately 6–8 pages (varies by vendor/reproduction).

Scope

VSN 64-86 applies to newly designed, reconstructed and existing chemical and other industrial enterprises where explosive, fire‑hazardous or harmful airborne chemical substances may be present. It is mandatory for facilities and design organizations responsible for projects that include zones with potential release of combustible gases or hazardous vapours. The guidance addresses siting of detectors and sampling devices, required automatic monitoring in specified explosive zones, and basic technical/installation rules for alarms and gas‑analyzers.

Key topics and requirements

• Identification of premises and process areas that require automatic gas/combustible‑atmosphere monitoring (explosive zones classes and criteria).
• Recommended vertical and horizontal placement of sensors and sampling inlets according to gas density (light gases, gases similar to air, heavy gases) and probable leak locations.
• Guidance on maximum distances from a leak source to sampling/sensor locations (practical placement radius, typical 10 m for primary monitoring points).
• Alarm arrangement and interconnection principles for pre‑explosive concentration alarms and for concentrations exceeding occupational maximum permissible levels.
• Basic technical and installation requirements for gas analysers, detectors and sampling lines (mounting heights for common gases, protection of devices in multi‑level/metallic platform structures).

Typical use and users

Primary users: safety engineers, process and instrumentation engineers, plant designers, commissioning teams and occupational hygiene specialists at chemical plants, petroleum/refining units, storage and handling facilities for flammable liquids/gases, and other industrial enterprises with potential explosive atmospheres. The guidance is used during design, reconstruction, safety audits, instrumentation selection and placement, and compliance checks.

Related standards

VSN 64-86 is a departmental norm that references general electrical installation and explosion‑protection rules (for example, PUE editions referenced in the text) and is used alongside relevant GOST/industry rules for instrumentation, explosion protection and occupational exposure limits. For practical projects it is typically used together with national electrical installation rules, GOSTs and contemporary regulatory documents addressing gas detection, ventilation and explosion safety.

Keywords

gas detector, gas analyser, gas alarm, combustible concentration, explosive atmosphere, detector siting, sensor placement, industrial safety, occupational exposure, VSN 64‑86, ВСН 64‑86, Минхимпром

FAQ

Q: What is this standard?

A: VSN 64-86 (ВСН 64-86) is a departmental methodical guidance document from 1986 providing mandatory recommendations for installing gas detectors and analysers to control pre‑explosive and maximum permissible concentrations of chemicals in industrial indoor air.

Q: What does it cover?

A: It covers which industrial premises need automatic monitoring, how and where to place sensors and sampling inlets (including recommended heights and distances depending on gas properties), alarm interconnection principles, and basic technical/installation requirements for detection systems used to protect against explosive atmospheres and excessive chemical concentrations.

Q: Who typically uses it?

A: Safety and process engineers, design institutes, instrumentation specialists, occupational hygienists, plant managers and regulatory inspectors at chemical and other industrial facilities where flammable or harmful vapours/gases may be present.

Q: Is it current or superseded?

A: The document was introduced on 1 July 1986 and remains available in current regulatory/documentation databases as departmental guidance; implementers should check for any newer national or industry‑specific regulations or modern standards that update technical requirements (databases show registry activity/updates through 2020–2021).

Q: Is it part of a series?

A: Yes — it is one of the departmental VSN (ВСН) / ведомственные нормы (departmental norms) documents produced for specific industries/processes; related VSN documents address other construction, installation and safety topics for industrial enterprises.

Q: What are the key keywords?

A: Gas detector, gas analyser, pre‑explosive concentration, maximum permissible concentration, sensor placement, explosive zone, industrial safety, VSN 64‑86, ВСН 64‑86.