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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

A

6500 fps

25
Q

What does primadet consist of

A

it is made of an outer plastic coating containing aluminized HMX

26
Q

When clearing a misfire with using primadet or shock tube

A

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
Q

What are the advantages of shock tube

A

minimum equipment, maintain positive control of charge, not subject to premature detonation due to static or stray currents,

28
Q

What are the disadvantages to shock tube

A

requires 30 min wait time after misfire

collection of expended tubing after firing shot

29
Q

What priming techniques can be used to prime dynamite

A

end priming (with blasting cap), lace (with det cord)

30
Q

What priming techniques can be used to prime c-4

A

end priming technique, side priming technique, hasty whip, uli knot, double overhand knot with detcord

31
Q

What priming techniques can be used to prime cast boosters

A

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
Q

What priming techniques can be used to prime semtex

A

end priming, side priming, hasty whip, uli knot, double overhand knot with detcord

33
Q

Wow can cast booster be dual primed

A

Lacing allows dual priming of det cord.

by using two blasting caps to prime detcord connected to the cast booster

34
Q

When priming c-4 how deep should the priming hole be

A

deep enough for the cap

35
Q

Describe 2 different det cord firing systems/lines

A

main line, ring main

36
Q

When running a branch line where should you place your charge in relation to the blasting caps placed in the det cord

A

90 degrees or more away from the cap(s)

37
Q

What 2 connections are used to splice det cord

A
  • overlap connection at least 18 inches of detcord overlapped and taped
  • square knot 6 inch pigtails and taped
38
Q

What 2 methods are used to prime detcord

A
  • 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
Q

What are some examples of detcord knots

A

hasty whip, modified girth hitch, double overhand, uli knot

40
Q

When do you drag a charge

A

never

41
Q

How many holes are necessary for a lacing technique to be used

A

4

42
Q

How many wraps are used in tying a hasty whip

A

minimum of 4 wraps

43
Q

When calculating timed fuse, what two times must you already know

A 
safe separation time (SST)
burn time (BT)
44
Q

What are the preventive measures that can be taken to prevent a non-electric misfire

A

capping procedures, correct procedures,don’t bury caps, no moisture in caps, dual firing system, secure caps

45
Q

A m60 igniter is used to what

A

Time fuse only

46
Q

M81 igniter is used for what

A

Time fuse and military shock tube

47
Q

What is the average burn rate for time fuse

A

30-45 seconds

48
Q

M700 time fuse burns how fast

A

40 seconds per foot

49
Q

What is the most sensitive part of the firing train

A

The blasting cap

50
Q

What is in a none electric blasting cap

A

Ignition charge: lead styphnate
Intermediate: lead azide
Base charge: RDX

51
Q

Where on the cap should you crimp a non electric cap

A

Crimp 1/8-1/4 from the open end of the cap

HDS 2021 (24 decks)

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