Urban Breaching (Chapter 14) Flashcards Preview

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Flashcards in Urban Breaching (Chapter 14) Deck (26)
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1

Breaching is the method an assault force uses to ?

Gain access to a hostile stronghold

2

What are the three keys to making a successful positive entry ?

Speed, surprise, and violence of action

3

What are the three breaching techniques ?

Mechanical
Ballistic
Explosive

4

How many grains of PETN does DET cord have per foot?

54 grains per foot

5

DET cord has an RE factor of ?

1.66

6

Blasting Caps are equivalent to how many grains of TNT?

30.4 Grains of PETN

7

Blasting caps have how many grains of PETN? What is its RE factor ?

19 grains
1.60

8

What is the formula for Safe Blast Distances?

SBD = K factor x Cubed Rooted N.E.W.
*round to next foot *
K = 18 is constant for 4 PSI

9

what is the K factor?

K factor is constant, 18 for 4 PSI

10

Operations will be planned for what PSI ?

4.0 PSI

11

What are some examples of a mechanical breach?

Sledge hammer , bolt cutters, halligan, brocco torch, quickie saw

12

What is an example of a ballistic breach?

Shotgun

13

What are some examples of an explosive breach?

Charges fabricated out of Det cord and/or sheet explosive

14

What are the explosive effects?

Blast Pressure
Fragmentation
Thermal Effect
Chemical Poisoning

15

What are the two aspects of blast pressure?

Positive phase (shock front coming out) and negative phase (vacuum at point of detonation)

16

What are the four types of blast pressure?

Dynamic
Incidental
Reflective
Residual

17

What is dynamic blast pressure?

Impact of the shock front

18

What is incidental blast pressure?

Pressure 90 degrees to the blast front, i.e. behind cover

19

What is reflective blast pressure?

Pressure will reflect back at twice the strength at 90 degree angles, corners can quadruple pressure

20

What is residual blast pressure?

Overpressure built up in a confined place

21

What is the most important hazard mitigation factor?

Breacher fall back point

22

Types of urban breaching charges

18" strip
Flex linear
Rigid linear
Water impulse
Rubber strip
Silhouette
Uli knot sliding

23

How is the amount of explosives in det cord measured?

Grains

24

How is the amount of explosives in sheet explosives measured?

Grams

25

Grams to grains equation

Grains = grams x 15.4

26

Grains to pounds equation

Grains / 7000 = pounds