Urban Breaching (Chapter 14)

Question 1

Breaching is the method an assault force uses to ?

Answer 1

Gain access to a hostile stronghold

Question 2

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

Answer 2

Speed, surprise, and violence

Question 3

What are the three breaching techniques ?

Answer 3

Mechanical
Ballistic
Explosive

Question 4

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

Answer 4

54 grains per foot

Question 5

DET cord has an RE factor of ?

Answer 5

1.66

Question 6

Blasting Caps have how many grains of PETN ?

Answer 6

13.5 Grains of PETN

Question 7

Blasting caps have an RE factor ?

Answer 7

1.60

Question 8

How long is a priming line off a breaching charge ?

Answer 8

6 inches

Question 9

If a hair clip is being used as a means of attachment for blasting caps what do you not need to account for ?

Answer 9

18 inch DET-cord loop

Question 10

Calculating 18” STRIP Charge N.E.W.

Answer 10

1) How long (X) how many wraps (+) 18” loop (+) 6 inch tail (total 24”)
2) Total in inches (divided) by 12 (Feet)
3) Det cord Grains 54 (X) total Feet
4) Total Feet by Det-cord (X) RE 1.66 = Total
5) Blasting cap grains 13.5 X 2 (dual primed) =27 Grains
6) 27 (X) Blasting cap RE 1.60 = 43.2 Grains = Total
Add the totals together and divide by 7000.

Question 11

What is the formula for Safe Blast Distances?

Answer 11

Distance = 3 Cubed Rooted N.E.W. (X) K Factor (PSI)

*Around to next foot *

Question 12

what is the K factor?

Answer 12

K factor is constant, 18 for 4 PSI

Question 13

Operations will be planned to exceed what PSI ?

Answer 13

4.0 PSI