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Calc and Place > Explosive Components (Chapter 2) > Flashcards

Explosive Components (Chapter 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 initiate

As 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 wire
M51 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
Q
  1. What is purpose of M8 Blasting Cap holder?
A

To secure blasting cap onto sheet explosives, may be used as a DET Cord clip

26
Q
  1. What is purpose of M1 DET Cord clip?
A

To splice DET Cord or attach branch lines• Faster and more efficient than tying knots

27
Q
  1. What is purpose of M2 CAP CRIMPER?
A

To attaches non-electric blasting cap on time fuse and DET Code, it has built in stop to limit amount of CRIMP applied

28
Q
  1. What are the two authorized types of M2 CAP Crimper?
A

Single and double

29
Q
  1. What are the characteristics of M2 crimper?
A

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
Q
  1. What is the only authorized uses of a demolition multi-tool?
A

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
Q
  1. What is two types of time fuse igniters?
A

M60 and M81

32
Q
  1. Describe M60
A

Designed to initiate M700 in all weather condition.Cannot initiate shock tube

33
Q
  1. What is the differences between M60 and M81 blasting igniters?
A

M81 has a more energetic primer, and has a shock tube reducer to accompany MDI and M700

34
Q
  1. Can you attach to DET Cord or M151 and M152 boosters?
A

Never

35
Q
  1. What is the mechanism of time fuse igniters?
A

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
Q
  1. What is purpose of Red and Green Devils?
A

Used to attach branch lines. May be fabricated from chem lights, shotgun shells or any soft plastic tube of the correct diameter

37
Q
  1. What is M51 Blasting cap test set?
A

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
Q
  1. How many M6 caps can a CD450-4J reliable fire in a series?
A

70 M6 CAPS in a series

39
Q
  1. What is characteristic of CD450-4J Blasting machine?
A

Must be kept warm in temps below 32 F
Not waterproof and will fail when wet
With good batteries it is capable of charing capacitors up to 450 Volts

40
Q
  1. What kind of wires commonly used in military?
A

AWG 18, AWG 20, WD1/Telegraphic transfer comm wire

41
Q
  1. What is required when you have to have long WD1 wire?
A

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
Q
  1. What are the methods for attaching firing wire?
A 
Hydrogel
Breachers tape
100 MPH tape
Zip tie
550 Cord
Bungies

Calc and Place (20 decks)

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