ISO 25760 meticulously outlines the risks associated with devalving, including:
: Recommended only for inert gases where venting to the atmosphere is environmentally permitted.
Lists common reasons why valves become inoperable.
. It is primarily intended for suppliers, testing facility operators, and maintenance personnel authorized to devalve cylinders. ISO - International Organization for Standardization Key Scope & Contents Safety Focus iso 25760 pdf
The standard (formally Gas cylinders — Operational procedures for the safe removal of valves from gas cylinders ) is a critical safety framework for the industrial gas sector. It establishes standardized methods for "devalving"—the process of removing a valve from a pressure receptacle—to prevent catastrophic failure or hazardous gas release during maintenance, inspection, or scrapping. Scope and Purpose
Protocols for recognizing blocked or structurally deformed valves. Mechanical design specifications of devalving machinery. Safe depressurisation routines for general gas types.
must be reported immediately; truck taken out of service until repaired. ISO 25760 meticulously outlines the risks associated with
: Techniques like creating an additional vent in the valve or cylinder wall under controlled conditions. Personnel and Facility Requirements
: Operators cannot assume a valve is open or empty just because the gauge reads zero or the handwheel turns. Blockages can trap full pressure beneath a closed internal seat.
A fundamental rule of ISO 25760 is that valves should only be removed after confirming there is no residual pressure . The standard warns against "operator errors," such as assuming a cylinder is empty because the valve is open or relying on potentially faulty pressure gauges. Managing Inoperable Valves It is primarily intended for suppliers, testing facility
ISO 25760 emphasizes that valves should after confirming there is zero residual pressure. To achieve this, it outlines several critical operational requirements:
The standard can be officially researched or purchased via the ISO 25760 Publication Page or accessed locally through regional standards bodies such as the British Standards Institution (BSI) as . Core Objectives and Scope
┌────────────────────────────────────────────────────────┐ │ ISO 25760 SCOPE BOUNDARIES │ └───────────────────────────┬────────────────────────────┘ │ ┌─────────────┴─────────────┐ ▼ ▼ [ INCLUDED RISKS ] [ EXCLUDED RISKS ] • Residual gas pressure • Mechanical tooling damage • Toxic gas exposure • Under-pressure LPG methods • Flash fires / Oxidation • Non-gas physical hazards
| Section | Key Provisions | | :--- | :--- | | | Hazard identification, operator safety protocols, qualification criteria, and handling of special valve designs. | | Procedures for Inoperable Valves | Standardized protocols for handling cylinders where the valve cannot be operated normally, including methods for safe identification and segregation. | | Depressurization Methods | Safe procedures for controlled gas release from cylinders with inoperable valves before removal. | | Handling Damaged Valves | Specific guidelines for safe management of cylinders with damaged valves. |