Gas Network Safety: Navigating the Gas Safety (Management) Regulations

GSMR were introduced to ensure that gas conveyed through pipeline systems is transported and managed safely. The regulations apply primarily to gas conveyors—those responsible for transporting gas in pipelines, including major network operators, industrial plant operators (if multiple companies are supplied), and increasingly, energy transition stakeholders involved in biomethane and hydrogen.

The regulations require that any person conveying gas in a network must submit a Safety Case to the Health and Safety Executive (HSE), detailing how gas will be managed safely. This includes arrangements for the prevention of gas escapes, control of gas composition, emergency procedures, and ensuring the gas is properly odorised for leak detection.

Critically, the GSMR requires that gas must not present a danger to life or property. This seemingly simple requirement carries with it a host of technical, operational, and procedural implications, especially in a system that is potentially geographically vast, interconnected, and increasingly an ageing asset.

One of the central pillars of GSMR is the requirement for Safety Cases. These must demonstrate that the operator has the technical competence, management systems, and risk controls necessary to convey gas safely. Importantly, these Safety Cases are not static documents—they must be regularly reviewed and updated to reflect changes in operations, infrastructure, or the external environment.

Another critical area is gas quality control. Gas must conform to prescribed limits, particularly regarding its calorific value and the Wobbe Index (a measure of combustion output, i.e. energy per kg), to ensure it can be safely used in domestic and industrial appliances. This is particularly relevant in light of growing interest in blending hydrogen or injecting biomethane into the grid, both of which can affect combustion properties.

GSMR also places key requirements on:

• Emergency arrangements, including having in place robust systems to deal with supply failures, major incidents, and coordination with the National Gas Emergency Service.
• Odorisation of gas, ensuring that any gas supplied to end users is detectable by smell in case of leaks.
• Monitoring and control of pressures, to prevent over-pressurisation and associated risks of rupture or failure.
• Security of supply, to ensure that the network has sufficient pressure for all supply points, and any critical consumers are identified.

GSMR does not operate in isolation. It interfaces with a range of other health and safety legislation, including the Pipeline Safety Regulations (PSR), the Gas Safety (Installation and Use) Regulations (GSIUR), and the Dangerous Substances and Explosive Atmospheres Regulations (DSEAR). Organisations must take an integrated approach to compliance, recognising the overlaps and distinctions between these regimes.

Other regulations may or may not apply to the gas network depending on the network design, such as the Pressure System Safety Regulations (PSSR), and the Control of Major Accident Hazards (COMAH) regulations. Increasingly, other environmental and sustainability regulations are being introduced, but these are not covered within this article.

Adding to the complexity is the decarbonisation of the gas network. The drive towards net-zero emissions is transforming how gas is produced, conveyed, and used. From hydrogen blending trials to the proliferation of renewable gas sources, these changes have far-reaching implications for GSMR compliance, particularly in terms of gas quality, safety case assumptions, and the management of new risks.

Despite the clarity of GSMR’s intent, real-world compliance can be difficult. Finch has found that many operators wrestle with ageing infrastructure, where legacy assets may not be adequately documented or maintained to contemporary standards. A frequent issue of knowing exact asset locations and maintenance records causes a challenge. Interfaces between asset owners, contractors, and third-party suppliers can introduce ambiguity about roles and responsibilities, especially during emergency events or when planning asset modifications.

Another frequent issue is the realism and relevance of emergency procedures. Too often, emergency plans are either too generic or too rarely tested, leading to poor preparedness when a real incident occurs. GSMR requires duty holders to be able to respond promptly and effectively, which calls for meaningful scenario testing (both desktop and physical drills) and regular reviews.

Furthermore, as gas compositions begin to vary, understanding the implications of gas quality becomes increasingly important. Poorly controlled inputs, even from renewable or green sources, can result in unsafe conditions downstream if not properly assessed and monitored.

At Finch, we bring deep expertise in engineering risk, asset management, process safety, and regulatory compliance. Our multi-disciplinary team has supported clients across the energy, utilities, and industrial sectors in meeting their GSMR obligations with confidence and clarity.

Our services include:

• Safety Case development and review, ensuring they are not only compliant but practical and aligned with your operational realities.
• Compliance audits and gap analysis, helping you identify and address vulnerabilities across your gas systems.
• Emergency preparedness support, including the design and delivery of realistic scenario-based exercises.
• Hydrogen transition readiness assessments, evaluating how changes to gas quality and supply impact your risk profile.
• Expert witness and incident investigation, where independent insight is needed following gas-related events.
• Competency development and training, tailored to engineering, operations, and compliance personnel.

We understand that compliance is not just about ticking boxes—it’s about protecting people, assets, and reputations. With the energy landscape evolving rapidly, now is the time to ensure your approach to gas network safety is fit for the future.

Conclusion

Gas safety is a non-negotiable aspect of modern network management. The Gas Safety (Management) Regulations provide a vital framework, but compliance requires much more than familiarity with the rules. It demands a proactive, risk-based approach supported by technical expertise and operational discipline.

Whether you’re a gas transporter, a site operator, or an organisation preparing for the next phase of the energy transition, Finch Consulting can help you navigate the regulatory landscape and strengthen your resilience.

Contact us today to find out how we can support your gas safety strategy. [email protected]