Demolition Safety and Transportation (Chapter 3)

Question 1

10. For calculating MSD, When do you refer table 6-2?

Answer 1

When charge weight is more than 27 lbs and less than 500 lbs

Question 2

19. In temporary storage, how explosive should be stack?

Answer 2

Explosive should:
Weigh no more than 500 lbs per pile
Placed no less than 140 feet apart

Question 3

3. What is minimum distance required to prepare electric blasting cap?

Answer 3

At least 155m from energetic source

Question 4

17. To ensure circulation of air, what is minimum distance from top of stack to ceiling or cover?

Answer 4

No less than 18 inches

Question 5

16. To ensure circulation of air, what is minimum distance from bottom of stack to earth flooring?

Answer 5

No less than 3 inches

Question 6

15. Where are blasting caps stored during transportation?

Answer 6

Transfer in separate location from the explosives

Question 7

How do you calculate MSD when charge weight is more than 500 lbs?

Answer 7

Meters = 100 x cube root of N.E.W

Feet =300 x cube root of N.E.W

Question 8

7. What is minimum requirement for time fuse test burn, and how many times should be conducted?

Answer 8

At minimum 3 ft test burn. Do not use the first or last 6” of time fuse from a new or partially used roll (moisture) Book answer is every 24 hrs. However it should be conducted every hour. Upon completion of test, mark roll with DTG, then tie half knot in non-working end

Question 9

5. Premature detonation of electric blasting caps may be include by

Answer 9

Radio
Radar
TV signal
Lightning
Static electricity

Question 10

1. What are the some considerations in demolition safety?

Answer 10

a) Maintain Control of all initiation source at all times (i.e. RAMS transmitter, electrical blasting machines, etc.)
b) Suspend blasting operations during electrical storms

Question 11

13. What is the first step you take when conducting a continuity check?

Answer 11

Ground yourself

Question 12

18. What is SADD?

Answer 12

Rules for storing explosives:
  Safety
  Accessibility
  Dryness
Drainage

Question 13

6. How many people requires to conduct explosive transportation?

Answer 13

Use only minimum number of personnel necessary to accomplish the mission

Question 14

12. How many fire extinguishers you must have when you transporting explosive and what are they?

Answer 14

2, Class B and C

Question 15

9. What is the MSD for charges that less than 27 lbs?

Answer 15

300 meter

Question 16

22. Can you destroy blasting cap with burning method?

Answer 16

NO. Blasting cap destroy by only detonation

Question 17

8. What is formula for DET Cord N.E.W?

Answer 17

Length in feet x 54 grains per foot x RE Factor = total grains of explosives
Grains / 7000 = NET EXPLOSIVE WEIGHT IN LBS

Question 18

4. When placing electrical blasting caps in a metal container, how much overlap should be on the lid ?

Answer 18

Minimum ½ inches overlap

Question 19

14. How long should you wait to clear a nonelectric misfire and electric misfire?

Answer 19

Non-electric: 30 minutes

Electric: Immediately

Question 20

20. What is the preferred method of disposing of explosive?

Answer 20

Burning

Question 21

2. If it is only means, can you use BLASTING CAPS underground?

Answer 21

No, Do not use blasting caps underground, use DET Cord or m151/m152 boosters

Question 22

21. When burning explosive what must you do?

Answer 22

Calculate Minimum Safety Distance

Ensure stacked pules will not exceed 2000 lbs or more than 3 inches thick