Firing Systems And Priming Methods

Question 1

Non electric initiation set components

Answer 1

M60/M81 fuse igniter or equivalent.
M700 time fuse.
M7 nonelectric blasting cap

Question 2

Nonelectric initiating set construction overview

Answer 2

1. Inspect roll, remove 6 inches
2. Conduct 3’ test burn
3. Determine desired burn time DBT
4. Calculate fuse length
5. Inspect and crimp blasting cap, attach igniter
6. Mark with dtg, name, system description.

Question 3

Calculating time fuse.

Answer 3

1. Conduct 3’ test burn and calculate ABR per foot
2. Convert burn time to seconds
3. Divide DBT by ABR
4. Convert the decimal to inches and 16’s of an inch

Note (conduct second test burn if ABR is outside 35 to 45 seconds)

Question 4

Electric initiating set components

Answer 4

Power source (cd450 blasting machine)
Firing wire
M6 electric blasting cap

Question 5

Knots for tying into line or ring main.

Answer 5

Square knot
Girth hitch with and extra turn
Gregory knot

Question 6

charge priming knots

Answer 6

M1 dynamite - det cord lace
TNT - 4 wrap knot
M112 - 4-6 wrap uli
Several applications - wiseman knot
Urban breaching - spiral knot

Question 7

M700 time fuse comes in ____

Answer 7

50’ coils

Question 8

M7 non electric blasting cap contains ____

Answer 8

An ignition charge, intermediate charge and a base charge (RDX. PETN, HMX)

Question 9

Requirements to set off M6 electric blasting cap

Answer 9

1.5 amps and 3 volts but as little as 1/4 amp can initiate.

2 ohms of resistance

Question 10

Det cord specs

Answer 10

PETN core
N.E.W. = 12.8 lbs PETN/1000 feet
54 grains per foot
We get 1000’ lengths 
Re factor 1.66

Question 11

Used to secure blasting caps into explosives with threaded cap wells.

Answer 11

M1A4 priming adapter

Question 12

Blasting cap test set

Answer 12

M51

Question 13

Can reliably fire 70 m6’s

Answer 13

Cd450-4j

Question 14

Reduces capacity of blasting machine by 10 caps per 1000 feet
Greater resistance

Answer 14

WD1/telegraphic transfer comes wire

Question 15

Primary and secondary initiation systems should be

Answer 15

At least 6” apart

Question 16

Nonel

Answer 16

Shock tube
Contains 89.5% HMX and 10.5% aluminum powder
Created to replace electric systems

Question 17

M152 rams components

Answer 17

M26, m16, m6

Question 18

Low strength caps

Answer 18

M12 w/ 500’ shock tube and M81
M13 w/ 1,000’ shock tube and M81
Will not set off military explosives but will set off det cord

Question 19

Boosters

Answer 19

M151 and M152

Secondary only, may be buried underground

Question 20

Splicing shocktube

Answer 20

Only used as a last resort, tubes are at most 1/4” apart

Question 21

M151 booster

Answer 21

10ft low strength det cord attached to booster cap
5-7.5 gr/ft of PETN
Takes place of branch line and priming not
Can be used to prep time explosives (secondary explosive)
Do not attach to M60 or M81

Question 22

Most common shock tube misfire

Answer 22

M81 fails to fire

Question 23

M26 transmitter

Answer 23

2km LOS
Up to 5km with M6 batter pack
Four unique codes and 3 common codes

Question 24

Firing wire

Answer 24

Available in 200 and 500 ft rolls

Question 25

Never use anything but ____ to test continuity of electric blasting caps

Answer 25

M51

Question 26

Used in place of det cord tie in knots, quick and effective

Answer 26

Red and green devils