The Role of Proximity Alert Systems in Advancing Safety
Originally presented at Drillfest 2023 in Toowoomba, October 2023, by Naaman Shibi of Pervidi. Published in ADIA Magazine, January 2024.
Safety is of paramount importance in the drilling industry, where workers face a myriad of hazards daily. At Drillfest 2023 in Toowoomba, Naaman Shibi from Pervidi discussed how proximity alert systems are poised to revolutionise safety measures in the drilling sector, and why the choice of system matters as much as the decision to deploy one.
Proximity alert systems, also known as proximity warning systems or proximity detection systems, are invaluable tools for enhancing on-site safety. Their primary function is to continuously monitor the location of employees and provide an alert when they venture too close to mobile machinery, explosive areas, or designated no-go zones. While these systems find applications across various industries, their role in the drilling sector is particularly significant due to the inherent risks associated with drilling activities.
Why Proximity Alert Systems Matter in Drilling and Mining
Drilling operations routinely require workers and heavy machinery to share the same physical space. Drill rigs, service trucks, water carts, and personnel vehicles move continuously around a site, often within a few metres of workers conducting manual tasks. The consequences of a collision, or of a worker entering a blast exclusion zone at the wrong moment, can be catastrophic.
Traditional control measures such as exclusion zones marked with tape, verbal communications on radio, and traffic management plans all have a role to play, but they depend on human vigilance at every moment. Proximity alert systems provide an automated, technology-based layer of protection that operates continuously, regardless of noise levels, shift fatigue, or line-of-sight limitations.
When a worker or vehicle breaches a configurable alert boundary, the system triggers an immediate notification, to the worker via a wearable device, to the vehicle operator via an in-cab display or audible alarm, or both. The result is a real-time safety net that supplements procedural controls without replacing them.
Diverse Types of Proximity Alert Systems
Naaman highlighted the diverse range of proximity alert systems currently available, each with its own set of advantages and limitations. Understanding those trade-offs is essential to selecting the right solution for a given site.
Camera-based systems employ cameras mounted on vehicles or at fixed points to monitor and detect objects or individuals in real time. They provide visual information and offer a clear view of surroundings, which can be recorded for later incident review.
Limitation: Camera-based systems require a direct line of sight and can be hampered by adverse conditions such as mud, darkness, or dust, all common on drilling and mining sites. Costs can also escalate significantly when advanced features such as AI-powered near-miss reporting are incorporated.
Radar technology is used for object detection in these systems. They do not depend on a direct line of sight, making them suitable for environments with obstructions, dust, or darkness where cameras struggle.
Limitation: Radar systems may produce false readings due to interference or the presence of natural objects such as vegetation or rock faces. While effective outdoors, they may have limitations when used in confined indoor or underground environments.
Light-based systems utilise plug-and-play warning lights on vehicles or equipment. Workers are alerted through visual cues provided by the lights, typically a colour-coded zone indicator visible from the surrounding area.
Limitation: These systems are passive and do not actively notify operators of employee presence; the worker must observe the light and respond. However, they are cost-effective and are commonly deployed in warehouse and indoor settings where the hazard profile is lower.
Tags and tablet-based systems rely on tablets and Bluetooth Low Energy (BLE) technology. Each employee is equipped with a small BLE-enabled tag worn on their person. Vehicles carry a tablet that detects nearby tags and triggers an alert when a worker enters the configurable hazard zone, typically between two and ten metres from the machine.
Advantage: Affordable, rapidly deployable, requires no fixed infrastructure, and operates entirely without internet connectivity, making it ideal for remote drilling sites.
The Tags and Tablet-Based Advantage for Remote Sites
Naaman emphasised the advantages of tablet-based proximity alert systems, particularly for the drilling industry where remote site conditions place strict demands on any safety technology.
Tags and tablet-based solutions stand out because they do not require additional fixed infrastructure, no cables, no fixed beacons, no network integration. This makes them well-suited for remote drilling sites where setting up infrastructure may be impractical or financially prohibitive. The system travels with the fleet: the tablets are mounted in vehicle cabs and the tags are issued to workers at the start of a shift, precisely as personal protective equipment is issued today.
Deployment is rapid. A BLE proximity alert system can be operational in a matter of hours rather than the days or weeks required to commission infrastructure-dependent alternatives. For drilling operations that regularly move between sites, this portability is a significant operational advantage.
Critically, the system operates independently of the internet. In remote and isolated locations where connectivity is limited or absent, the proximity detection continues to function without interruption. There is no dependency on a mobile network signal or a site-based Wi-Fi system.
Each worker carries a small BLE tag, roughly the size of a key fob, that broadcasts a signal continuously. Tablets mounted in vehicle cabs receive these signals and calculate proximity in real time. When a worker's tag is detected within the alert zone, the tablet emits an audible alarm and displays a visual warning to the operator. Simultaneously, the worker's tag can vibrate or sound its own alert. The configurable alert zones allow safety managers to set distance thresholds appropriate to the specific machine type and operating speed.
A Real-World Case Study: Drilling Operations in the United States
Naaman shared a case study from a drilling company in the United States that faced operational challenges related to outdoor drilling activities. Workers and service vehicles regularly operated in close proximity, and the existing procedural controls were not providing the level of protection management required.
Following the introduction of a tags and tablet-based proximity alert system, the company achieved notable improvements in safety outcomes. The system facilitated better collision avoidance among employees and vehicles, with operators receiving real-time alerts when workers approached their machines. Site management reported a significant reduction in near-miss events and an improvement in worker confidence on site, a factor that itself contributes to better safety culture and reporting rates.
The system's portability also proved valuable. As the company relocated its drilling fleet between sites throughout the project, the proximity alert hardware moved with it, requiring no site-specific installation or reconfiguration at each new location.
Applications Beyond Drilling: Mining, Construction, and Warehousing
While the Drillfest presentation focused on the drilling sector, proximity alert systems address a safety challenge that is common across many industries where mobile plant and pedestrians share a workspace. The same BLE tag-and-tablet approach applies directly to:
- Surface and underground mining: protecting workers near haul trucks, excavators, and underground loaders in environments where visibility and noise levels make verbal warnings unreliable
- Construction sites: alerting plant operators to workers in blind spots during civil earthworks, demolition, and material handling operations
- Warehousing and distribution: detecting pedestrians in forklift operating zones, particularly at intersections and in areas where racking obstructs sightlines
- Quarrying: creating electronic no-go zones around blast areas that trigger alerts if workers breach the exclusion boundary before the all-clear is given
In each context, the fundamental requirement is the same: reliable, real-time detection of workers near mobile machinery, without dependence on human vigilance alone. The broader safety management platform can record near-miss events captured by the proximity system, integrate them into incident reporting workflows, and provide management with trend data on hazard exposure across the fleet.
Choosing the Right Proximity Alert System for Your Site
The choice of the right proximity alert system should be tailored to the specific needs and operational circumstances of each site. Key factors to evaluate include:
- Site connectivity: Remote sites with no internet access need systems that operate offline; infrastructure-dependent solutions will fail in these environments.
- Site mobility: Operations that move between locations benefit from portable, infrastructure-free systems that can be redeployed rapidly.
- Environmental conditions: Dusty, dark, or wet conditions limit camera-based systems; BLE and radar-based approaches are more resilient.
- Worker density: High worker counts require systems that can handle multiple simultaneous tag detections without false alerts or missed detections.
- Integration requirements: Sites that want near-miss data integrated into safety management software benefit from systems with data export or API connectivity.
- Budget: BLE tag-and-tablet systems offer the most cost-effective entry point; camera and radar systems carry higher hardware and integration costs.
Future Developments: GPS Integration and Smarter Alerting
In response to questions from the Drillfest audience, Naaman noted that Pervidi was continually advancing its proximity alert technology. While the systems presented at Drillfest did not incorporate GPS, a deliberate choice to maintain offline independence and minimise hardware cost, the platform remains open to further innovations based on evolving industry needs.
GPS integration would enable proximity data to be combined with asset location tracking, creating a single operational view of where every person and every machine is on a site at any given moment. This level of real-time situational awareness would allow safety managers to identify patterns in near-miss clustering, optimise traffic management plans based on actual movement data, and provide regulators with a comprehensive record of workforce exposure to mobile plant hazards.
With ongoing technological advances, safety measures in the drilling and mining industry are on the brink of a broader revolution. Workers will be able to carry out their tasks with greater confidence and security, and site managers will have access to data that makes safety decisions evidence-based rather than intuitive.
Frequently Asked Questions
What is the detection range of a BLE tag-and-tablet proximity alert system?
Detection range is configurable and typically spans from two to ten metres, depending on the specific hardware and the alert threshold set by the safety manager. The zone can be adjusted to reflect the stopping distance of the vehicle at typical operating speeds, a slow-moving water cart might use a tighter zone than a haul truck travelling at speed on a haul road. Multiple zones (warning and critical) can be configured to provide graduated alerts as a worker draws closer to the machine.
Do proximity alert systems work underground?
Yes. BLE tag-and-tablet proximity alert systems operate without GPS or mobile network connectivity and function effectively in underground environments where other location technologies fail. The BLE radio signal passes through typical underground conditions without significant degradation at the detection ranges used for safety alerting. Camera and radar-based systems may face more limitations underground due to confined geometries, dust, and lighting conditions.
Can proximity alert data be integrated with safety management software?
Yes. Proximity alert systems that log near-miss events can export that data to safety management platforms, where it feeds into incident reporting, risk registers, and trend analysis. Integration with Pervidi's broader inspection and safety management platform allows near-miss data from the proximity system to be linked to the relevant asset, operator, and location, creating a richer safety record than standalone proximity hardware provides.
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