Overview
EN ISO 14114:2018 / ISO 14114:2017 - "Gas welding equipment - Acetylene manifold systems for welding, cutting and allied processes - General requirements" - specifies design, materials and testing requirements for acetylene cylinder manifold systems. The standard covers manifold pipework from the cylinder valve or bundle outlet to the outlet of the main shut-off valve and applies whether single cylinders or cylinder bundles are coupled for collective gas withdrawal. It also includes a test procedure for acetylene decomposition blockers and is published by CEN as the European adoption of ISO 14114:2017.
Key topics and technical requirements
- Scope and definitions: Clear terminology for manifold components (e.g., manifold high-pressure pipework, flame arrestor, decomposition blocker, change-over unit).
- Design and materials: Requirements for construction materials and configuration of manifold systems and components to ensure safe acetylene supply.
- Mandatory components: Systems shall include devices such as high-pressure non-return valves located immediately downstream of the cylinder/bundle outlet; options include purge valves and combinations per ISO 15615.
- Pressure categories: Definitions for low pressure (≤ 1.5 bar) and high pressure (> 1.5 bar up to 25 bar) components and related valve types.
- Safety devices: Requirements for flame arrestors, temperature- or pressure-sensitive cut-off valves, automatic shut-off devices and pressure limiting devices to mitigate acetylene decomposition risks.
- Testing requirements:
- Strength test (mechanical integrity)
- External gas tightness test
- Decomposition blocker test procedure (detailed in Annex B)
- Marking and instructions: Mandated marking of equipment and provision of user instructions for safe installation, operation and maintenance.
- Annexes: Normative annexes include standard configurations of manifold systems (Annex A) and the decomposition test procedure (Annex B).
Applications and users
This standard is intended for anyone involved with the design, manufacture, installation, inspection and procurement of acetylene manifold systems for welding and cutting:
- Manufacturers of gas welding equipment and manifold assemblies
- Safety and design engineers specifying acetylene supply systems
- Installers and maintenance teams in fabrication shops and industrial facilities
- Procurement and quality teams assessing compliance of cylinder bundles and manifolds
- Inspection bodies and regulators enforcing gas safety and storage rules
Practical applications include fixed cylinder banks, change-over units, cylinder bundles used to supply acetylene to welding and cutting stations, and systems where prevention of acetylene decomposition is critical.
Related standards
Normative references in EN ISO 14114 include (among others):
Keywords: EN ISO 14114:2018, ISO 14114, acetylene manifold systems, gas welding equipment, decomposition blocker, cylinder bundle, pressure regulator, manifold pipework, welding and cutting safety.
