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Calc and Place Study Guide > Explosive Components (Chpater 2) > Flashcards

Explosive Components (Chpater 2) Flashcards

1
Q
  1. What is purpose of M700 time blasting fuse?
A

Provides a time delay

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2
Q
  1. What is burning rate of M700 time blasting fuse?
A

Approximately, 40 seconds per foot

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3
Q
  1. Describe M700 time blasting fuse
A

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
Q
  1. What is R.E factor of Detonating cord?
A

1.66

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5
Q
  1. How does detonating cord issued?
A

Issued in 100, 500, and 1000 ft lengths

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6
Q
  1. What is the core of detonating cord?
A

PETN (white powder core) 54 grams per foot

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7
Q
  1. What is N.E.W of 1000 ft PETN?
A

12.8 lbs

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8
Q
  1. What is purpose of detonating cord?
A

Used to prime and detonate other explosives • Used alone functions as an explosive charge

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9
Q
  1. What is DET cord transmit rate?
A

20,000 to 24,000 feet per second

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10
Q
  1. When priming charges with DET cord, how long pigtail should be left?
A

6 inch

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11
Q
  1. How deep moisture can penetrate the explosive filing of DET cord?
A

Maximum distance of 6 inches from any cut or break in the coating.

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12
Q
  1. Describe DET cord
A

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
Q
  1. What are two types of blasting caps?
A

Electric (M6) or non-electric (M7)

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14
Q
  1. What is against U.S policy for blasting caps?
A

It is against U.S policy to bury blasting caps

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15
Q
  1. How does blasting cap function?
A

Function by transmitting either a small flame or a pulse of electricity into a detonation wave

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16
Q
  1. What is disadvantage of blasting caps?
A

Extremely sensitive to shock and heat

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17
Q
  1. How much energy do M6 electric blasting caps need to function?
A

1.5 AMP / 3 VOLTS to initiateAs little as .250(1/4) amp could set off an M6

18
Q
  1. What must you do when checking continuity on M6?
A

Always ground yourself before unshunting wire, M6 should be under a sandbag or demo bag w/o demo in it

19
Q
  1. what does an electric initiating set consist of
A

CD450-4J blasting machine (power source)RL39A Firing wireM51 Blasting cap test set

20
Q
  1. When misfire on an electrical initiating set how do you clear misfire?
A

Use a new power source, clear misfire with power source. Misfires may be investigated immediately

21
Q
  1. what does a non-electrical initiating set consist of
A

M60/M81 initiator-source of ignitionM700 time fuse- time blasting fuseM7 non-electric blasting cap

22
Q
  1. Describe M7 Non-electric blasting cap
A

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

23
Q
  1. What makes easy to use M7 with M700 or DET Cord?
A

M7 blasting cap flared at the open end which allow easy insertion of time fuse or DET Cord

24
Q
  1. What is purpose of M1A4 Priming adapter?
A

To secure blasting caps into explosives with threaded cap wells

25
25. What is purpose of M8 Blasting Cap holder?
To secure blasting cap onto sheet explosives, may be used as a DET Cord clip
26
26. What is purpose of M1 DET Cord clip?
To splice DET Cord or attach branch lines• Faster and more efficient than tying knots
27
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
28
28. What are the two authorized types of M2 CAP Crimper?
Single and double
29
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
30
30. What is the only authorized uses of a demolition multi-tool?
Use of knife on tool in order to cut shock tube and C4 punch to prime cap wells are the only authorized use of tool
31
31. What is two types of time fuse igniters?
M60 and M81
32
32. Describe M60
Designed to initiate M700 in all weather condition.Cannot initiate shock tube
33
33. What is the differences between M60 and M81 blasting igniters?
M81 has a more energetic primer, and has a shock tube reducer to accompany MDI and M700
34
34. Can you attach to DET Cord or M151 and M152 boosters?
never
35
35. What is the mechanism of time fuse igniters?
When the M60 OR M81 reaches its limits of travel, the Pull ring rod releases the firing pin. The spring forces the pin into the primer. The primer fires with a flame, and an explosive shock ignites the time fuse or initiates the shock tube
36
36. What is purpose of Red and Green Devils?
Used to attach branch lines. May be fabricated from chem lights, shotgun shells or any soft plastic tube of the correct diameter
37
37. What is M51 Blasting cap test set?
Used to test blasting capsUsed to check firing wire for continuity and shorts• Never use anything other than an M51 test set, initiation could result from unapproved equipment
38
38. How many M6 caps can a CD450-4J reliable fire in a series?
70 M6 CAPS in a series
39
39. What is characteristic of CD450-4J Blasting machine?
Must be kept warm in temps below 32 FNot waterproof and will fail when wetWith good batteries it is capable of charing capacitors up to 450 Volts
40
40. What kind of wires commonly used in military?
AWG 18, AWG 20, WD1/Telegraphic transfer comm wire
41
41. What is required when you have to have long WD1 wire?
Requires a greater power sources if longer than 500ft due to resistance therefore reduce capability of blasting machine used by 10 caps per 1000 ft employed
42
42. What are the methods for attaching firing wire?
HydrogelBreachers tape100 MPH tape Zip tie, 550 Cord, Bungies

Calc and Place Study Guide (15 decks)

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