the history of explosives n. c. dept. of transportation safety & loss control
TRANSCRIPT
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The History of Explosives
N. C. Dept. of Transportation
Safety & Loss Control
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Black Powder
• Saltpeter or “Nitre”• Chinese as early as the
10th Century• Roger Bacon
published formula in 1242
• Berthold Schwartz invented Gun ~ 1300
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Black Powder
• First Powder Mill in Massachusetts in 1675
• Americans first blasted with powder around 1773
• American Revolution hastened manufacture of black powder
• New frontiers required blasting to build roads and canals for transporting goods and people (early 1800s)
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What is This?
Baptist Church?
Dance Hall?
Powder Magazine
Colonial Williamsburg, VA.
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How Important was Black Powder?
Guard House Location 10’ Wall Storage
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• Discovered by Ascanio Sobrero in 1846
• Nobel built factory in 1861
• Nobel Patented Dynamite in 1867
• Problems included fumes, freezing, & headaches
• 750 million pounds manufactured in 1955
Nitroglycerin and Dynamite
Dynamite - from Dynamis, meaning power
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Ammonium Nitrate
• Synthesized in 1659 by J. R. Glauber
• Used for fertilizer and explosives products
• Texas City explosion
• ANFO
• Pros: Easier to load, cheaper, and safer than dynamite
• Cons: desensitized by water
• Over 2.2 Billion pounds manufactured in 1974
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Water Gels
• Developed in 1940s to solve the water problem
• Non-Nitroglycerin
• Use increased with development of equipment for drilling large diameter holes
Pros: economics, loading density, low sensitivity, water resistance, no nitroCons: needs sensitizer, not for small holes
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Binary/Two Component Explosives
• Usually consist of Ammonium Nitrate (sensitizer) and Nitromethane (fuel)
• Advantages include:
– not a Class A explosive until mixed
– no danger of fire while in storage
– available in correct type and size
– can deactivate after mixing
– will detonate at minus 140F
• Disadvantages include:
– cost
– time required to mix
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Initiation Devices
• Safety Fuse
• Fuse Caps
• Electric Blasting Caps
• Delay Caps
• Vented Caps
• Composition Caps
• Detonating Cord
• Nonelectric Delay Caps
• Shock Tube
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ANFO
•EXPLOSIVES type ANFO•PURPOSE
•Explosives type ANFOs are based on ammonium nitrate, fuel oil and additions. They are used for open air and underground blasting works in the mines and quarrieres, where no methane gas, coal dust or water are presented.
•INITIATION•Explosives type ANFO are initiated by TNT booster with min.charge of 0,400 kg or another material of equivalent power with fire detonator, electric detonator, non-electric (NONEL) detonator or detonating cord attached.
•TERMS OF STORAGE•Explosives type ANFO have to be stored in dry, indoor stores by temperature from minus 35C to 35C up to 3 months from the date of manufacturing