Working with Velocity of Detonation to get the best from your blast design

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 3200 and 6000 m/s.

Why Is Measuring Velocity of Detonation 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 this? More often than not, we rely on suppliers to test VOD on-site.

Bulk explosives are expensive, and their performance directly impacts blasting outcomes. 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.
• Increase powder factor by adding more bulk explosives.

However, these adjustments increase drill and blast costs, which may not solve the actual problem: underperforming explosives. If the explosive’s VOD is lower than expected due to incorrect mixing or product issues, the blast results suffer, driving up operational costs unnecessarily.

The Importance of VOD Testing

Measuring VOD is a critical aspect of drill and blast engineering and shot firing. It helps ensure the explosives purchased are performing as expected when detonated.

In the past, VOD testing was often avoided due to high costs and complex setups. But that’s no longer the case with ShotTrack’s VOD units.

Why Choose ShotTrack VOD Units?

ShotTrack’s VOD system makes testing simple, affordable, and efficient. Key features include:

• Ease of Use: The system uses a single-button operation and standard coaxial cable for quick setup.
• Cost-Effective: No need for annual calibration. The unit calibrates the coaxial cable, eliminating maintenance costs.
• Self-Managed Testing: VOD testing can now be handled directly on-site, giving you control over performance verification.
• Portable and Reliable: Designed for tough environments, our VOD unit ensures consistent results every time.

Unlike other VOD testing units that require specialised training and complex setups, the ShotTrack VOD unit empowers users to take control of their blast performance without unnecessary hassle.

Get Better Blasting Results with ShotTrack

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 today to learn more about our VOD unit and other innovative products.