The Institution of Gas Engineers and Managers (IGEM) has published IGEM/G/4 Edition 3 – Definitions for the Gas Industry, providing a single, consistent source of terminology for use across IGEM standards and guidance documents. The new edition seeks to address historic variations in terminology that have developed across standards over time, establishing a common reference point that supports consistency, regulatory alignment, and current industry best practice.
For AMO gas members, the publication is particularly relevant as it introduces a standardised approach to definitions that will apply to IGEM standards published from 1 April 2026 onwards where individual definitions are not provided within the specific standard. Existing standards published before this date will continue to use their existing definitions until they are revised, withdrawn, or superseded. This transitional approach aims to minimise disruption while improving industry-wide consistency.
The document has direct relevance to gas metering activities. IGEM confirms that the standard should be read alongside IGEM/G/1 – Defining the Boundaries Between the Network, Primary Meter Installation and Installation Pipework, recognising the importance of established metering definitions that have been accepted by Ofgem for use within Great Britain. The alignment between IGEM/G/4 and IGEM/G/1 will help ensure consistent interpretation of metering responsibilities, asset boundaries, and industry terminology across operational, engineering, and regulatory environments.
The scope of the standard extends beyond natural gas to include LPG, LPG/air systems, biomethane, hydrogen and hydrogen blends, reflecting the evolving energy landscape and supporting future decarbonisation activities. For AMO members involved in metering, asset management, network interfaces, or emerging hydrogen projects, the publication provides greater clarity and consistency as the industry prepares for a more diverse gas mix.
While the publication does not introduce new operational requirements, it provides an important reference point that will improve consistency across future technical standards, support clearer interpretation of metering arrangements, and help reduce ambiguity when implementing new gas industry requirements. Members should consider reviewing internal procedures, technical documentation, and training materials to ensure terminology remains aligned with the latest industry definitions.