While hydrogen production facilities and hydrogen refuelling stations both handle hydrogen gas, the risks associated with each environment are very different. Hydrogen production facilities focus on generating, processing and storing hydrogen, whereas hydrogen refuelling stations are designed to safely dispense hydrogen to fuel cell vehicles. [www1.eere.energy.gov]
As a result, gas detection systems must be tailored to the specific hazards, operating conditions and safety objectives of each application. Understanding these differences is essential when designing an effective safety strategy.
Why Hydrogen Presents a Unique Detection Challenge
Hydrogen offers many advantages as a clean energy carrier, but it also presents several challenges when it comes to gas detection and safety management.
Unlike many conventional fuels, hydrogen molecules are extremely small, allowing the gas to escape through leaks that may not be significant with other gases. Once released, hydrogen disperses rapidly and, because it is lighter than air, can accumulate in high-level areas if ventilation is inadequate.
Hydrogen also has a flammable range of approximately 4% to 75% in air, which is significantly wider than many traditional fuels. Combined with its very low ignition energy, this means even relatively small releases can become hazardous if an ignition source is present.
For operators, early leak detection is critical. Identifying and responding to a release before a flammable atmosphere develops can significantly reduce the risk of fire, explosion and operational disruption.
These characteristics mean that hydrogen gas detection systems must be carefully designed around the specific risks of a facility. Detector placement, ventilation patterns and the location of potential leak sources all play an important role in ensuring hydrogen releases can be detected as early as possible.
Gas Detection Requirements in Hydrogen Production Facilities
Hydrogen production facilities contain several areas where gas detection plays a vital role in maintaining safe operations. These sites often involve continuous processes, extensive pipework networks and multiple locations where hydrogen is generated, processed or stored.
Electrolyser Areas
Electrolysers generate hydrogen through the electrolysis of water and contain potential leak points around stacks, connections, valves and associated pipework. Operators must also consider the presence of oxygen and electrical equipment within these environments.
Bulk Storage and Buffer Tanks
Hydrogen storage systems can contain significant quantities of gas, often under pressure. Any leak within these areas has the potential to create hazardous conditions and should be continuously monitored.
Pipework, Valves and Fittings
Flanges, valves, fittings and pipework networks can all become sources of fugitive emissions. In enclosed or poorly ventilated areas, hydrogen may accumulate if leaks go undetected.
Detection Strategy
Hydrogen production facilities typically prioritise:
- Continuous monitoring of process equipment.
- Coverage across multiple operating zones.
- Monitoring of enclosed buildings and roof spaces.
- Integration with ventilation and process safety systems.
- Early warning to prevent hydrogen concentrations approaching hazardous levels.
Detector Placement
As hydrogen rises quickly, detectors are commonly positioned at elevated locations where gas is most likely to accumulate. Particular attention should be paid to ceiling voids, enclosed structures and areas where ventilation may be restricted.
Inspection and Maintenance
Like any safety-critical system, gas detectors require routine inspection, functional testing, calibration and preventative maintenance to ensure reliable operation. Maintenance schedules should always follow manufacturer recommendations and site-specific safety procedures.
Gas Detection Requirements in Hydrogen Refuelling Stations
Hydrogen refuelling stations present a different set of challenges compared to production facilities. Although the overall volume of hydrogen may be lower, the gas is often stored and dispensed at very high pressures. Modern hydrogen refuelling stations commonly dispense hydrogen at pressures of 350 bar or 700 bar depending on the vehicle application, placing significant demands on compression, storage and dispensing equipment.
Bulk Storage Areas
Hydrogen stored on-site or delivered via tube trailers can create potential leak risks during transfer operations and storage activities.
Compression and Cascade Storage Systems
Compressors and cascade storage systems operate under high pressure and significant mechanical stress. These areas require careful monitoring due to the risk of leaks, equipment fatigue and hydrogen embrittlement.
Cooling Systems
Many refuelling stations incorporate cooling systems to support efficient vehicle fuelling. These systems introduce additional equipment that may require monitoring and maintenance.
Dispensing Areas
Dispensers, hose assemblies and vehicle connection points experience frequent use throughout daily operation, creating potential leak locations that benefit from continuous monitoring.
Detection Strategy
Hydrogen refuelling stations typically focus on:
- High-pressure leak detection.
- Protection of dispensers and compressors.
- Rapid alarm activation.
- Integration with emergency shutdown systems.
- Protecting operators, drivers and members of the public.
Detection Technologies
Depending on the design and risk assessment, facilities may utilise a combination of point gas detectors, ultrasonic gas leak detectors and flame detection technologies to provide multiple layers of protection.
Key Differences in Detection Strategies
Although both applications handle hydrogen, their operational priorities are fundamentally different.
Hydrogen Production Facilities
The primary objective is process safety and explosion prevention. Production facilities often contain larger process areas, extensive equipment networks and continuous operations that require broad monitoring coverage.
Gas detection systems are typically designed to:
- Monitor multiple process zones.
- Support ventilation control.
- Assist process shutdown procedures.
- Provide plant-wide leak detection coverage.
Hydrogen Refuelling Stations
Refuelling stations place a greater emphasis on public safety and rapid equipment isolation. These sites rely on fast reaction times to help minimise risk around high-pressure dispensing equipment.
Gas detection systems are typically designed to:
- Detect leaks around critical equipment.
- Trigger emergency shutdown systems.
- Protect public-access areas.
- Support rapid incident response.
While both environments require reliable gas detection, the design philosophy is driven by the way hydrogen is produced, stored and ultimately used.
Integrating Detection into Site Safety Systems
Gas detection is one of the most important layers of protection in both hydrogen production facilities and hydrogen refuelling stations. However, it should never operate as a standalone safety measure.
When a hydrogen leak is detected, automated responses can be triggered depending on the severity of the alarm. These may include audible and visual alarms, increased ventilation rates, emergency shutdown procedures and automatic isolation of affected equipment.
In hydrogen refuelling stations, these systems help protect both operators and members of the public. In production facilities, they help minimise the risk of an incident escalating across larger process areas.
Many sites also integrate gas detection with fire detection systems, building management systems, control systems and remote monitoring platforms. This allows operators to respond more effectively and investigate potential hazards before they develop into serious incidents.
Choosing the Right Detection Solution
There is no one-size-fits-all approach when it comes to hydrogen gas detection.
Every facility has different operating conditions, equipment layouts and risk profiles, meaning detector selection and placement should always be based on a comprehensive site-specific risk assessment.
Factors such as ventilation, occupancy levels, potential leak sources and environmental conditions all influence system design. A hydrogen production facility may require extensive monitoring across process equipment and storage areas, while a refuelling station may focus on compressors, dispenser cabinets and fuelling points.
Regular maintenance and calibration are equally important. Even the most advanced detection system can only provide reliable protection if it is routinely inspected and tested.
As hydrogen infrastructure continues to expand, facilities should also consider future growth requirements to ensure their safety systems remain effective as operations evolve.
How Protex Supports Hydrogen Projects
Although hydrogen production facilities and hydrogen refuelling stations both handle hydrogen, the risks associated with each application are very different. This means gas detection strategies must be tailored to the specific operating environment, equipment and hazards present on site.
Effective gas detection relies on selecting the appropriate technology, positioning detectors correctly and integrating detection into a wider safety strategy. By identifying leaks at the earliest possible stage, operators can reduce risk, protect personnel and support safe day-to-day operations.
At Protex Systems, we work closely with customers to design gas detection solutions that meet the specific requirements of their hydrogen applications. From initial site assessments and detector selection through to system integration, maintenance and ongoing support, our team helps ensure facilities are equipped with reliable detection systems that support both safety and operational resilience.
