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Guideline

Users of the Magnum Buster Technology and Cartridges are EXEMPT from ATF regulation.

Users are NOT required to acquire an ATF Explosives User License and , as such, are NOT required to comply with ATF storrage, handling and recordkeeping stipulations.

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Also review the Read More Button in the Regulatory Determination section to the right for additional information.


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Pursuant to the regulation at 27 CFR §555.32, ATF has the option to exempt certain explosive actuated devices, explosive actuated tools, or similar devices from the requirements of this part, which as designed do not constitute a public safety or security hazard.

After careful consideration, the ATF has determined that the Magnum Buster booster cartridges do not pose a threat to public safety when possessed and used for their intended purpose in rock breaking operations. Therefore, the ATF is exempting them as special explosive devices pursuant to 27 CFR §555.32 provided ...

Determination

Pursuant to the regulation at 27 CFR §555.32, ATF has the option to exempt certain explosive actuated devices, explosive actuated tools, or similar devices from the requirements of this part, which as designed do not constitute a public safety or security hazard.

After careful consideration, the ATF has determined that the Magnum Buster booster cartridges do not pose a threat to public safety when possessed and used for their intended purpose in rock breaking operations. Therefore, the ATF is exempting them as special explosive devices pursuant to 27 CFR §555.32 provided:

1. The cartridges are used as intended for breaking rock or similar materials.

2. No single cartridge exceeds 27 grams of smokeless powder content.

3. Sell the cartridges only to persons possessing a Magnum Buster tool, and who have a legitimate rock-breaking need for the cartridges.

4. Provide instructions for the safe use of the cartridges with each distribution.

5. Keep company records of all distributions of the cartridges to end users, containing the date of the distribution, the identity of the purchaser, and the number and size of cartridges distributed.

5. Keep company records of all distributions of the cartridges to end users, containing the date of the distribution, the identity of the purchaser, and the number and size of cartridges distributed.

Any alterations to the device or the packaging of the device will render this exemption void and necessitate a separate request for exemption. Further, the manufacture of a different device will necessitate a separate request for exemption.

ATF Position Statement


There will also be operational benefits to this licensing process:


 

 

REFERENCE: Web Site www.rocburst.com. The website, in addition to the write up below, shows numerous videos and includes other operational information that enhance the operational knowledge base of this industrial rock breaking technology. The Magnum Buster is a Propellant based Industrial Power Device ...

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Magnum Buster Science & Physics

REFERENCE: Web Site www.rocburst.com. The website, in addition to the write up below, shows numerous videos and includes other operational information that enhance the operational knowledge base of this industrial rock breaking technology.

The Magnum Buster is a Propellant based Industrial Power Device that utilizes ammunition like cartridges that are in fact initiated with a standard 209 Shot Shell Center Fire Ammunition Primer. This is important as this ammunition based design distinguishes us from the number of other products that utilize classical explosive initiation components such as det fuses with electric wire or nonel initiation systems.

In summary, the Magnum Buster is a safe and reliable rock breaking technology utilizing a proprietary cartridge that can only be initiated with its companion tool. The initial shock wave is transmitted by initiating a small Hilti nail gun cartridge. The gas pressure transmits down the gas channel of the tool and onto the water column of a water filled drill hole. This shock wave produces sufficient pressure to shear a fine disk in the top part of the cartridge. Integrated into this disk is a plastic firing pin that accelerates forward, "taps", and fires the standard shot shell center fire primer that is fitted into the middle plastic primer holder. This sequence initiates the cartridge in the hole.

It is important to note that the water in the drill is essential to the system. It not only provides the medium that allows transmission of the shock wave to the cartridges it also provides a non-compressible medium within the drill hole that allows the rock to hydro fracture. Without the water the cartridge would neither fire nor have adequate confinement to build pressure sufficient to break the rock.

The hardware design, as well, has a multiple function purpose: One is to initiate the Hilt cartridge and secondly to close the hole and provide weight to seal the drill hole, which better confines the pressure pulse thus producing optimal and controlled rock breakage.

The Magnum Buster design offers both safety and productivity in a controlled process by utilizing the gas generating characteristics of smokeless powder.

  • The most important feature of Propellant when used in Magnum Buster applications resides in its unique chemical property that when initiated produces an energy source that is 100% rapid gas expansion.

  • With High explosives you have 3 phases.

  • The detonation phase that is essentially wasted energy and mostly pulverizes the rock around the drill hole. This is the largest component of the energy release, say around 75 to 80 percent.

  • The seismic phase is the vibration source that sends shock waves through surrounding materials. In some circumstances, these vibrations can be destructive to adjacent structures.  Reduction of these affects is generally the reason for designing ms delays in an explosive round.

  • The rapid gas expansion phase.  This is only about 15% of the total energy release of a high explosive but the component that accomplishes most of the rock fracturing. The other components are either wasted or destructive. However, high explosives are a relatively inexpensive commodity so in mass excavation applications it is still cost effective to waste 80% of the available energy sources. The 15% remaining that actually does the real work of rock fragmentation is still cost beneficial. As such it is this rapid gas expansion phase that actually presses into the natural fractures and continues fracture propagation which is the process that breaks rock into productive unit sizes.

  • Propellant is 100% rapid gas expansion and has none of the other destructive energy phases.  This is also why it is perfect for launching projectiles.  Were these other energy phases present in propellant they would be bombs rather than ammunition.

  • When using propellant, as we do in a drill hole filled with fluid, we take advantage of these inherent physical properties of propellant.  We introduce it into the center of the rock and take advantage of the rapid gas expansion to force the non-compressible water into the natural fractures to first initiate crack formation and then to further propagate the crack to some final extent of completion. We are essentially breaking the rock in tension which is always the weakest force keeping it intact. Even hydraulic breakers that bounce around on the surface of rocks will not actually break the material until the tool tip finds a tensile weakness. Then the rock actually breaks. Not in compression.

  • This aspect of the science of Rock Mechanics originates from the 1920's Griffith Crack Theory.  The theory was postulated after a growing phenomenon of metal ships breaking apart and sinking on the high seas. After much study and analysis it was determined that the welding process was leaving micro-fractures in the metal.  Further investigation determined that even though it took fairly significant tensile energy forces to initiate the crack, it required progressively less energy to propagate the crack to completion – so once started they usually propagated to completion.  This was what brought about the science of x-ray for critical metal structures.

  • This is the basis of how our technology fits so perfectly into breaking rock but in a more controlled environment and without the excessive energy components that is part of the makeup of high explosives. The classical term we use is Hydro Fracturing which uses water in the hole to create a non-compressible shock environment. Cartridge initiation thus produces an initial rapid gas expansion similar to a bullet launching a projectile to first shock the column of water that subsequently shocks the rock with a fairly high peak energy that lasts only milliseconds. This is sufficient to initiate fracturing. From here the gas pressure starts to progressively dissipate over additional milliseconds of time but still pushing water through the propagating cracks. However since structural materials like rock require less energy to continue a crack propagation than to initiate one we are able to break fairly large chunks of material in a safe and controlled fashion. By controlled we mean minimal throw of the rock beyond its original confined state. Generally the rock breaks apart and falls within a couple of feet of its original footprint. This gas energy transferred to the water simply does not have the power to throw the broken material any great distances as the energy is fully dissipated by the time the crack propagation completes itself to free space..

  • In addition there is no VOD (Velocity of Detonation) since there is no detonation or seismic component to propellant.  In fact we had a project many years ago to excavate a rock trench alongside an operational high pressure gas line.  The contractor was prohibited from using hydraulic rock breakers as the rock breakers introduced excessive seismic energy which was beyond the engineering factor of safety allowed for this project.  Our technology was the application of choice as it did not introduce a seismic damage potential.