Advanced Steel (Chapter 10) Flashcards Preview

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Flashcards in Advanced Steel (Chapter 10) Deck (28)
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16. How to determine saddle charge dimensions?

Charge thickness: 1 inches
Base of Charge: ½ circumference of target
Long Axis of charge: circumference of target

2

14. What is cutting method of saddle charge?

Cross fracture method

3

5. What is ribbon charge formula

Charge Volume = Charge Thickness x Charge Width x Charge length

Thickness = ½ Thickness of the target or minimum ½” of thickness (if thickness is less than ½”)
Measure the thickest part of the target

Width = 3 x Thickness

Length = Desired length of cut

4

6. How to find charge thickness for a ribbon charge?

½ Thickness of the target or minimum ½” of thickness (if thickness is less than ½”)

5

15. Where are saddle charges primed?

At the apex of the long axis

6

3. Where do you prime a ribbon charge?

Top center or either end of the ribbon charge

7

1. What types of the explosives use for advanced steel?

Plastic and sheet explosive

8

4. What is purpose of a ribbon charge?

Used for flat steel up to 3” thick
If thickness is greater than 3”, conduct test shot

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9. What are the volumes of explosive block charges for M112, M186, C2, M1, and TNT?

M112: 20
M186: 9
C2 Prima Sheet: 9.96
M1 dynamite: 10
TNT: 21.43

10

7. How to calculate ribbon charge width and length?

Width: 3 x charge thickness
Length: Desired length of cut

11

11. How much explosive should be surrounding the blasting cap?

½” surrounding the blasting cap

12

21. How to calculate the dimensions and volume of a diamond charge?

Long axis = Circumference
Short axis = (1/2) x Circumference

For volume use saddle charge formula
CV=B^2

13

12. What are the considerations for a C shaped ribbon charge?

A) DET Cord branchlines must be the same length and connected with British junction or M151 Boosters can be used to help with simultaneous detonation

B) Same thickness, width, and length rules apply as a ribbon charge on flat steel

14

20. Where is diamond charge primed?

At the apexes of the short axis (2)

15

10. What is a C Shaped ribbon charge, and what is its purpose?

Three ribbon charges shaped to fit structural steel
To cut structural steel.

16

2. What are the 4 types of advanced steel charge?

Ribbon charge
C Shaped ribbon charge
Saddle charge
Diamond charge

17

18. What is cutting method of Diamond charge?

Stress wave method

18

22. What type of charge would you use if the targets are steel plate, high carbon bar, and mild steel bar?

Steel plate: ribbon charge
High carbon: Diamond charge
Mild steel bar: Saddle charge

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17. What is the formula for volume of a Saddle charge?

CV = B^2

OR

CV = (1/2)B x LA x 1

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19. What is purpose of diamond charge?

To cut HIGH CARBON OR ALLOY steel bar up to 8 inches in diameter

21

13. What is purpose of saddle charge?

Used on MILD STEEL bars (Round, Square, rectangular) up to 8 inches in diameter

22

Advantage of advanced over conventional charges

Uses considerably less explosive than conventional charges

23

Effect of molding M112

Reduces density thereby reducing its RE factor by as much as 25%

24

Rules of thumb for offset on a C-shaped ribbon charge

1/2 offset
If thickness anywhere is greater than 2 inches, use a full offset

25

Special instructions for construction of a saddle charge

Add 15% to the length of the base during construction

26

Special instructions for construction of a diamond charge

Add 15% to the length of the long axis during construction

27

How should you lay M112 block when constructing a saddle charge and a diamond charge?

Saddle charge: Parallel to the base
Diamond charge: Parallel to the long axis

28

Where do you prime a C-shaped ribbon charge

On the side with the web and flanges covered, in the center (1)

On the side with just the flanges, on the ends (2)