What is Velocity of Detonation (VoD)?
Velocity of Detonation (VoD) measures the strength and performance of a bulk explosive. It refers to the speed at which the detonation front moves through an explosive column and is an industry-approved indicator of explosive performance.
Typically measured in metres per second (m/s), VoD for gassed emulsion-based explosives usually falls between 3,200 and 6,000 m/s.
Why measuring VoD is important
Every bulk explosive comes with a specified VoD range provided by the supplier. While it's assumed that explosives perform within this range, how often do we verify it? If the VoD falls outside the specified range, it can lead to:
- Poor blast results.
- Increased costs for rock breaking, digging, and crushing.
The real cost of poor blasting performance
When blast results are unsatisfactory, the typical response is to reduce burden and spacing, or increase powder factor by adding more bulk explosives. These adjustments increase drill and blast costs — and may not solve the actual problem: underperforming explosives. If the VoD is lower than expected due to incorrect mixing or product issues, results suffer and costs rise unnecessarily.
Why choose ShotTrack VoD units?
- Ease of use: single-button operation and standard coaxial cable for quick setup.
- Cost-effective: no annual calibration — the unit calibrates the coaxial cable.
- Self-managed testing: VoD testing handled directly on-site.
- Portable and reliable: designed for tough environments and consistent results.
With the ShotTrack VoD system you can ensure your explosives are performing optimally, maximising the efficiency of your blast designs and reducing operational costs. Contact the ShotTrack team to learn more.