Breaching

Question 1

4 breaching techniques

Answer 1

Mechanical, ballistic, explosive, exothermic

Question 2

Explosive effects and hazards

Answer 2

Blast pressure
Fragmentation
Thermal effect
Chemical poisoning

Question 3

Blast pressure phases

Answer 3

Positive phase-layer of compressed air, shock front leading edge, sudden hammering blow
Negative phase-displaced air creates a vacuum at detonation point, air reverses and rushes in

Question 4

4 types of blast pressures

Answer 4

Dynamic, incidental, reflective, residual

Question 5

Dynamic pressure

Answer 5

Pressure felt and damage caused by impact of shock front. If you can see the charge the charge can see you

Question 6

Incidental pressure

Answer 6

Pressure measured at 90 degrees to blast front. A person behind a barrier is exposed

Question 7

Reflective pressure

Answer 7

Pressure will build up and reflect back twice the strength at 90 degree angles off the impacted surface, corners can quadruple (reflected pressure in neg phase will also increase speed)

Question 8

Residual pressure

Answer 8

The overpressure built up in a confined space

Question 9

Fragmentation

Answer 9

Shattering fragments from the charge and items located near the charge

Question 10

Thermal effect

Answer 10

Bright flash or fireball immediately after the detonation

Question 11

Chemical poisoning

Answer 11

Chemical used in explosives, the detonation itself, and the toxic gases from building materials

Question 12

Real vs training

Answer 12

Use lower NEW. Single strand vs triple strand

Question 13

Primasheet fruit roll up general placed ____

Answer 13

Hinge side

Question 14

To convert grams to grains

Answer 14

Grams x 15.4

Question 15

To convert grains to pounds

Answer 15

Grains / 7000 = pounds

Question 16

Grains tnt in a cap

Answer 16

30.4

Question 17

RE of a cap

Answer 17

1.60

Question 18

Det cord grains per foot

Answer 18

54 grains per foot

Question 19

RE of det cord

Answer 19

1.66

Question 20

MSD formula for out in the open

Answer 20

Cube root(NEW) x 18 = MSD in feet

Question 21

MSD formula for feet

Answer 21

Cube root(NEW) x 12 = MSD in feet

Question 22

Primasheet grams

Answer 22

2 grams per sq in

Question 23

6 Exothermic torch components

Answer 23

02 tanks
Regulator
Hose
Head/gun
Rod
Ignition source

Question 24

Exothermic torch characteristics

Answer 24

Chemical oxidation reaction 
10,000 degrees 
Rod held in direct contact
Can pierce 4” of concrete
98% oxygen

Question 25

Optimal exothermic torch pressures

Answer 25

3/8” rod 75-85psi

1/2” rod 85-95psi

Question 26

4 cutting techniques

Answer 26

Pierce
Speed cutting
Pendulum
Vantage points

Question 27

Angle cuts approx

Answer 27

30 degrees