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HDS 2021 > Demolition Procedures-Non Electric > Flashcards

Demolition Procedures-Non Electric Flashcards

1
Q

A safety fuse system consists of what 3 components

A

Igniter, time fuse, non-electic cap

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2
Q

A shock tube system consists of what 2 components

A

shock tube/ primadet, shock tube firing device

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3
Q

What are 7 different types of fuses

A
  • matches
  • pull wire fuse lighter
  • hot wire fuse igniter
  • m-60 igniter
  • m81-igniter
  • safety fuse
  • time fuse m-700
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4
Q

What explosives does time fuse contain

A

black powder

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5
Q

What explosives does det cord contain

A

PETN-white
RDX-pink
HMX (high melting explosive) white

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6
Q

Time fuse and det cord can both be OD green, how do you tell them apart

A

time fuse will have a black core, det cord will have a white or pink core, and time fuse will have markings on the casing

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7
Q

What is an easy way to identify an M7 military non-electric blasting cap

A

M7 has a flared tip

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8
Q

What is the most sensitive portion of the explosive train

A

blasting cap

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9
Q

What blasting cap is equivalent to the military m7 blasting cap

A

8 civilian cap

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10
Q

When attaching a blasting cap, what is the first thing you do upon receiving the cap

A

Look for obstructions and condition inside of the cap

obstructions, dents, water, moisture.

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11
Q

What 3 steps do you preform when preparing safety (time) fuse for use

A
  • tie a knot in the non-working end of time fuse
  • cut and dispose of 6 inches of time fuse from the free end
  • cut and test burn 3 ft of time fuse (50 ft downwind) to determine the burn rate per foot.
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12
Q

How far away from explosives should a test burn be conducted

A

minimum of 50 ft downwind from explosives, use safe separation time (SST) and burn time (BT) to determine burn rate (BR).

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13
Q

What components make up crimpers

A

crimp jaw, cutting jaw, screw driver, priming spike, stop stamp

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14
Q

List steps when performing cap procedures

A

maintain positive control at all times, full arm’s length, inspect inside and outside of cap, safety fuse vertical at full arm’s lenght, slip cap over safety fuse, create a marriage crimp 1/8-1/4 from open end, fully crimp,

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15
Q

When priming explosives what part of the crimping tool is used

A

priming spike

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16
Q

How do you prime explosives to prepare for cap insertion

A

insert priming spike in explosives creating large pocket to accept cap (s).

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17
Q

Upon inserting a non-electric blasting cap into an explosive what should be done to the fuse to avoid it curling back and burning through itself

A

weigh the time fuse down in two places with dirt or sand 12”-18” from each end

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18
Q

Prior to igniting time fuse or firing a charge, what safety measure must be conducted

A

give 3 “fire in the hole!” alerts

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19
Q

What are measures you can implement to prevent misfires with time fuse

A

use dual firing system, follow all steps, secure caps in charge (taped), don’t bury caps, capping procedures, avoid moisture in caps

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20
Q

When clearing non-electric misfires

A

allow 60 minutes plus burn time
use minimal personnel to clear misfire (no more than 2)
counter charge the misfire

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21
Q

What are the advantages of time fuse

A

minimum amount of equipment, not subject to premature detonation due to static or stray currents

22
Q

What are the disadvantages of time fuse

A

there is no control after system has initiated, misfires require a 60 min what time

23
Q

What is primadet

A

primadet is shock tube with non-electric blasting cap already affixed to the tube

24
Q

What is the detonation velocity of primadet

25
What does primadet consist of
it is made of an outer plastic coating containing aluminized HMX
26
When clearing a misfire with using primadet or shock tube
double check the functioning of the firing device, test powder in the tube, declare a misfire, wait 30 minutes before going down range, counter charge the misfire charge
27
What are the advantages of shock tube
minimum equipment, maintain positive control of charge, not subject to premature detonation due to static or stray currents,
28
What are the disadvantages to shock tube
requires 30 min wait time after misfire | collection of expended tubing after firing shot
29
What priming techniques can be used to prime dynamite
end priming (with blasting cap), lace (with det cord)
30
What priming techniques can be used to prime c-4
end priming technique, side priming technique, hasty whip, uli knot, double overhand knot with detcord
31
What priming techniques can be used to prime cast boosters
detcord in priming hole and through cast booster, loop the cord back end of the boaster unit cord stops in priming pocket, you can prime with a cap by putting it in the detcord pocket
32
What priming techniques can be used to prime semtex
end priming, side priming, hasty whip, uli knot, double overhand knot with detcord
33
Wow can cast booster be dual primed
Lacing allows dual priming of det cord. by using two blasting caps to prime detcord connected to the cast booster
34
When priming c-4 how deep should the priming hole be
deep enough for the cap
35
Describe 2 different det cord firing systems/lines
main line, ring main
36
When running a branch line where should you place your charge in relation to the blasting caps placed in the det cord
90 degrees or more away from the cap(s)
37
What 2 connections are used to splice det cord
- overlap connection at least 18 inches of detcord overlapped and taped - square knot 6 inch pigtails and taped
38
What 2 methods are used to prime detcord
- 6 inch priming loop and prime cap into the loop | - non-electric blasting cap crimped to the end of detcord and primed onto the charge.
39
What are some examples of detcord knots
hasty whip, modified girth hitch, double overhand, uli knot
40
When do you drag a charge
never
41
How many holes are necessary for a lacing technique to be used
4
42
How many wraps are used in tying a hasty whip
minimum of 4 wraps
43
When calculating timed fuse, what two times must you already know
``` safe separation time (SST) burn time (BT) ```
44
What are the preventive measures that can be taken to prevent a non-electric misfire
capping procedures, correct procedures,don't bury caps, no moisture in caps, dual firing system, secure caps
45
A m60 igniter is used to what
Time fuse only
46
M81 igniter is used for what
Time fuse and military shock tube
47
What is the average burn rate for time fuse
30-45 seconds
48
M700 time fuse burns how fast
40 seconds per foot
49
What is the most sensitive part of the firing train
The blasting cap
50
What is in a none electric blasting cap
Ignition charge: lead styphnate Intermediate: lead azide Base charge: RDX
51
Where on the cap should you crimp a non electric cap
Crimp 1/8-1/4 from the open end of the cap

HDS 2021 (24 decks)

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