Complete Guide to Confined Space Drone Inspection in Singapore
Published 15 April 2026 · SG Drone Inspections
What Is Confined Space Drone Inspection?
Confined space drone inspection uses specially designed collision-tolerant drones to inspect the interior of enclosed spaces — storage tanks, pressure vessels, boilers, ducts, tunnels, and voids — without requiring human entry. This eliminates the significant safety risks associated with confined space work.
In Singapore, where Jurong Island hosts one of the world's largest petroleum refining and petrochemical complexes, confined space inspections are a routine but hazardous requirement. The Workplace Safety and Health Act classifies confined space work as high-risk, requiring extensive safety protocols including atmospheric monitoring, rescue standby, and entry permits.
Drone technology transforms this equation. A Flyability Elios 3 enters a tank through a standard manhole, navigates the interior while capturing 4K video, thermal imaging, and LiDAR data, then exits — all while the inspection team remains safely outside.
How It Works
Pre-Inspection Planning
We review asset drawings, identify access points, and plan the inspection flight path. Safety protocols established without need for confined space entry procedures.
Drone Deployment
The collision-tolerant drone enters through access hatches as small as 40cm. Its protective cage allows contact with walls and structures without damage.
Data Capture
4K camera captures visual condition of internal surfaces. Thermal sensor identifies hot spots and insulation defects. LiDAR creates 3D point cloud of the interior geometry.
Analysis and Reporting
Captured data analysed for corrosion, coating degradation, structural defects, and build-up. Report delivered with annotated imagery and condition assessment.
Applications in Singapore
Petrochemical Tanks
Storage tanks on Jurong Island inspected for internal corrosion, coating condition, and structural integrity during turnarounds.
Marine Vessels
Ballast tanks, cargo holds, and void spaces inspected without yard entry delays. Shipyards in Tuas and Jurong benefit from faster turnaround.
Building Services
HVAC ducts, ceiling voids, and underground utility tunnels inspected for condition assessment and maintenance planning.
Water Treatment
Water tanks and treatment chambers inspected for coating condition and structural defects without draining or human entry.
Safety Advantages
- Zero Human Entry — no personnel exposed to toxic atmospheres, oxygen deficiency, or physical entrapment risks.
- No Atmosphere Testing — since no one enters, atmospheric monitoring for the space entry is not required.
- No Rescue Team Standby — eliminating entry eliminates the need for confined space rescue teams on standby.
- Reduced Downtime — inspections can proceed without full tank cleaning or gas-freeing in many cases.
- WSH Compliance — using drones satisfies the hierarchy of controls by eliminating the hazard rather than managing it.
Cost and Time Comparison
| Factor | Drone Inspection | Manned Entry |
|---|---|---|
| Setup time | 1-2 hours | 4-8 hours (atmosphere testing, rescue setup) |
| Inspection duration | 2-4 hours | 4-8 hours (with breaks and rotations) |
| Personnel required | 2-3 (pilot + observer) | 6-8 (entrant + attendant + rescue + supervisor) |
| Tank preparation | Minimal | Full cleaning and gas-freeing may be required |
| Typical cost | $3,000-$8,000 | $8,000-$20,000+ |
Frequently Asked Questions
Technical Specifications and Capabilities
Understanding the technical capabilities of confined space inspection drones helps asset owners appreciate what data they will receive and how it compares to traditional manned entry methods.
| Specification | Flyability Elios 3 | Manned Entry |
|---|---|---|
| Visual Camera | 4K video, 12MP stills | Handheld camera (variable) |
| Thermal Sensor | Radiometric FLIR, 160x120 | Handheld thermal (if carried) |
| 3D Mapping | LiDAR point cloud | Not available |
| Access Size | 40cm x 40cm minimum opening | Standard manhole (60cm) |
| Flight Duration | Up to 12 minutes per battery | Limited by atmosphere/fatigue |
| Lighting | 10,000 lumen onboard LED | Headlamp + torch |
| Safety Risk | Zero human exposure | Atmospheric, physical, engulfment |
The LiDAR capability of the Elios 3 deserves special mention. While inspecting the interior of a tank or vessel, the drone simultaneously creates a 3D point cloud model of the space. This digital twin can be used for volumetric calculations, wall thickness trending, and precise location referencing of defects — capabilities that are not available through traditional visual inspection.
Planning a Confined Space Drone Inspection
Successful confined space drone inspections require planning specific to the asset type and condition. Here is what we need from you and what we handle.
Information We Need
Asset drawings showing internal dimensions, access point locations and sizes, contents history (what has been stored), internal structures or baffles, and any known defect areas from previous inspections.
Preparation Required
The space should be emptied of contents and ideally cleaned of loose debris. Access hatches should be opened. For tanks with floating roofs, the roof position should be documented.
What We Handle
All CAAS permits, equipment mobilisation, pilot operations, data capture, analysis, and reporting. We also coordinate with your site safety team and comply with all site-specific PTW requirements.
Deliverables
HD video of the complete internal survey, high-resolution still photographs of all surfaces and defects, thermal data showing temperature anomalies, 3D LiDAR point cloud, and comprehensive condition report.
Regulatory Framework in Singapore
Singapore's regulatory framework strongly supports the adoption of drone technology for confined space inspections through the principle of hazard elimination.
The Workplace Safety and Health Act requires employers to take reasonably practicable measures to ensure safety. The hierarchy of controls prioritises elimination of hazards above all other measures. When a drone can perform the inspection without human entry, using manned entry instead may be difficult to justify as meeting the "reasonably practicable" standard.
MOM's Code of Practice for Working in Confined Spaces details the extensive requirements for manned entry — atmospheric monitoring, rescue standby, entry permits, communication systems, and trained personnel. Each of these requirements represents a cost and complexity that drone inspection eliminates entirely.
For Jurong Island operations, the Major Hazard Installations (MHI) regulations add another layer of safety requirements for confined space work. Drone inspection aligns with the MHI principle of minimising human exposure to hazardous environments during routine maintenance and inspection activities.
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