Stuart Head, technical and certification manager at Petrel, explores lighting in explosive areas
Stuart Head, technical and certification manager at Petrel, explores lighting in explosive areas
Ensuring safety while maintaining operational efficiency in explosive atmospheres poses a significant challenge. Flammable gases, vapours, and combustible dusts create high-risk environments where a single ignition can lead to disastrous consequences. Strict safety regulation requirements add complexity to daily operations.
Additionally, the need for specialised equipment, such as explosion-proof lighting, increases cost of ownership and maintenance. The harsh conditions and strict regulations in these environments also demand regular maintenance to prevent accidents.
The advancement of technology has led to significant changes in the lighting industry. With the phase-out of fluorescent lamps, Light Emitting Diodes (LEDs) have emerged as the primary lighting solution. This shift to LED technology presents both benefits and challenges that must be considered to ensure safe and efficient operations in explosive atmospheres.
The legal situation
Hazardous area lighting must comply with UK, European and international regulations. This legislation currently requires UK sites to meet the ATEX Directive (2014/34/EU), ensuring they’re designed and manufactured to prevent ignitions in explosive environments. To comply, manufacturers must:
- Design products for explosion protection.
- Have certain products third-party approved by a notified/approved body.
- Undergo site assessments by a notified/approved body.
- Provide technical documentation.
- Apply correct markings.
- Maintain quality management systems.
- Conduct regular audits. These working practices ensure adherence to essential safety requirements for equipment in potentially explosive atmospheres.
Advantages of LED in explosive environments
LED lighting is highly energy-efficient and consumes significantly less power than traditional, older lighting systems. This efficiency results in reduced energy costs, an important factor for industries relying on extensive lighting. Using energy-efficient LEDs will not only save up to 50% per year in energy costs, but also contribute towards a carbon net-zero journey.
Additionally, the longevity of LEDs translates to lower maintenance costs and fewer operational disruptions. While fluorescent lamps are relatively inexpensive, the costs associated with obtaining permits, powering down circuits and conducting the work, can become very costly. By contrast, LEDs minimise the need for maintenance and lamp replacements. This is especially true when these are bespoke modules designed to work within the luminaire, and not just a LED lamp.
LED lighting also provides improved visual acuity in the most hazardous areas, offering better colour rendering and directional light control. Enhanced visual acuity is critical in these environments, where accurate visual cues and colour perception can significantly impact safety.
A well-designed LED luminaire will also contribute to higher energy savings owing to their increased compatibility with the use of controls. The lifespan of older technologies is negatively affected by users turning them on and off frequently. Some try to reduce maintenance costs by leaving lights illuminated continuously. LED luminaires are not affected by users turning them on and off many times a day, since they consume no power when off, and strike instantly with 100% light output.
Challenges of using LED lighting in explosive environments
Despite the benefits, implementing LED technology in explosive environments presents challenges. One such issue is ensuring compliance with stringent safety regulations. Explosive atmospheres demand lighting systems that minimise the risk of ignition, requiring the development and certification of LED luminaires that are specially designed for hazardous locations. This adds complexity and cost to the transition process.
Another challenge is managing heat dissipation. LEDs generate heat during operation, and effective thermal management is crucial in hazardous areas. The good news is that a well-designed LED system can run cooler than its equivalent in legacy products. This lower temperature translates to better T ratings and ultimately a safer product and working environment.
Lastly, maintaining consistent performance under extreme conditions is an ongoing concern for LED lighting. These harsh environments often expose systems to vibration, shock, and extreme temperatures, impacting the reliability and longevity of luminaires. To address this issue, manufacturers must design thermally managed, robust products that can withstand these harsh environments.
Embracing the inevitable transition
The phase-out of fluorescent lighting has made the transition to LED technology an inevitable step, but manufacturers and end-users can collaborate to ensure a successful, safe and efficient transition.
Design software can aid in the compliance process supporting good lighting practices and standards. These simulations can demonstrate the lighting required for an area, and provide vital information regarding uniformity, colour rendering (CRI) and levels when emergency luminaires are needed.
The future of lighting in explosive environments
As industries continue to evolve and adopt new technologies, embracing LED lighting in hazardous areas is a vital step towards enhancing safety, efficiency, and operational performance. Although challenges can be present, ongoing innovation and collaboration between manufacturers and end-users will pave the way for the widespread adoption of LED technology in critical environments. By embracing the inevitable transition and addressing the key hurdles, hazardous area lighting can move forward into a more sustainable, cost-effective, and safer future.
