Flashcards in Explosive Components (Chapter 2) Deck (42)
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1. What is purpose of M700 time blasting fuse?
Provides a time delay
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2. What is burning rate of M700 time blasting fuse?
Approximately, 40 seconds per foot
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3. Describe M700 time blasting fuse
Issued in 50’ coils, black powder core, packed in green plastic cover, transmits a flame from an igniter to a non-electric blasting cap
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4. What is R.E factor of Detonating cord?
1.66
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5. How does detonating cord issued?
Issued in 100, 500, and 1000 ft lengths
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6. What is the core of detonating cord?
PETN (white powder core) 54 grams per foot
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7. What is N.E.W of 1000 ft PETN?
12.8 lbs
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8. What is purpose of detonating cord?
Used to prime and detonate other explosives • Used alone functions as an explosive charge
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9. What is DET cord transmit rate?
20,000 to 24,000 feet per second
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10. When priming charges with DET cord, how long pigtail should be left?
6 inch
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11. How deep moisture can penetrate the explosive filing of DET cord?
Maximum distance of 6 inches from any cut or break in the coating.
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12. Describe DET cord
A flexible cord containing a fiber wrapped core of PETN. 0.2 inches in diameter• To avoid internal cracking do not step on it
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13. What are two types of blasting caps?
Electric (M6) or non-electric (M7)
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14. What is against U.S policy for blasting caps?
It is against U.S policy to bury blasting caps
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15. How does blasting cap function?
Function by transmitting either a small flame or a pulse of electricity into a detonation wave
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16. What is disadvantage of blasting caps?
Extremely sensitive to shock and heat
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17. How much energy do M6 electric blasting caps need to function?
1.5 AMP / 3 VOLTS to initiate
As little as .250 (1/4) amp could set off an M6
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18. What must you do when checking continuity on M6?
Always ground yourself before unshunting wire, M6 should be under a sandbag or demo bag w/o demo in it
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19. What does an electric initiating set consist of
CD450-4J blasting machine (power source)
RL39A Firing wire
M51 Blasting cap test set
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20. When misfire on an electrical initiating set how do you clear misfire?
Use a new power source, clear misfire with power source. Misfires may be investigated immediately
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21. what does a non-electrical initiating set consist of
M60/M81 initiator-source of ignitionM700 time fuse- time blasting fuseM7 non-electric blasting cap
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22. Describe M7 Non-electric blasting cap
Used with M700 time fuse or DET CordContains an ignition charge, lead styphinate, intermediate charge, lead azide, and a base charge of RDX, PETN or HMX
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23. What makes easy to use M7 with M700 or DET Cord?
M7 blasting cap flared at the open end which allow easy insertion of time fuse or DET Cord
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24. What is purpose of M1A4 Priming adapter?
To secure blasting caps into explosives with threaded cap wells
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25. What is purpose of M8 Blasting Cap holder?
To secure blasting cap onto sheet explosives, may be used as a DET Cord clip
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26. What is purpose of M1 DET Cord clip?
To splice DET Cord or attach branch lines• Faster and more efficient than tying knots
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27. What is purpose of M2 CAP CRIMPER?
To attaches non-electric blasting cap on time fuse and DET Code, it has built in stop to limit amount of CRIMP applied
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28. What are the two authorized types of M2 CAP Crimper?
Single and double
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29. What are the characteristics of M2 crimper?
two Jaws: top jaw for crimping bottom jaw for cutting time fuse and det cordtwo Legs: pointed end for priming wells and flat end is a standard bit screwdriver.• Coated in a black oxidized finish to prevent sparking
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