Demo Procedures Flashcards
How many holes are necessary for a lacing technique?
4 with a 6 inch tail
How many wraps for a hasty whip (minimum)?
4
How are blasting machines rated?
Rated in number of caps in series the machine will reliably detonate?
Which knots could you use to attach two pieces of Det cord together?
Square knot or modified girth hitch
Which knot would you use to initiate C-4 with unsensitized Det cord?
Double overhand or Uli knot
Which knot would you use to tie two pieces of Det cord together to form a longer length?
Square knot
Which knot could you use to attach Det cord to dynamite?
Lace or hasty whip
T or F. An electrical firing system consists of an electric Blasting cap, firing wire, Galvo, and a M81 igniter?
False
What would you use a galvometer for?
Check firing wire and electric blasting caps for continuity
T or F. A crisper should be used to cut Det cord?
False. No metal to metal to cut explosives.
What knot would you use to attach a branch line to either a ring main or main line?
Modified girth hitch
After connecting two caps in series circuit, what step must be done next?
Check circuit for continuity
How many twists of an electrical blasting cap leg wires will provide a proper shunt?
Minimum 3 twists
When connecting two pieces of Det cord together with tape, what is the minimum length of surface area will the Det cord contact with each other?
18 inches
To properly electrically dual prime an explosive, the bomb tech will have to?
Prime the explosive with two electric caps in parallel
What is the purpose of performing the close-open-close test on the firing wire after it is laid out?
To ensure that there are not shorts or breaks in the wire
When lacing explosives, what is the minimum length of the pigtails?
6 inches
What is the wait time for a non-electric misfire?
60 minutes plus burn time
What are some disadvantages of non-electric procedures?
Wait time and no control over shot
What are preventative measures that can be taken to prevent a non-electric misfire?
No moisture in caps, dual system, secure caps, correct procedures, don’t bury caps and corrective procedures
What factors determine the safe separation time (SST) for a demo operation?
The time needed for a person to walk at a normal pace from the demo site back to the safe area before the explosion occurs
When crimping a non-eclectic cap onto time fuze, what is the appropriate distance to crimp from the open end of the cap?
1/8 inch to 1/4 inch
What’s are the two types of det cord systems?
Ring main and main line
When attaching a branch line to a main line, what is the minimum angle of the branch line from the direction of the detonating wave?
90 degrees
What is the first thing you do to a new roll of time fuse before conducting a test burn?
Tie a knot on the non-working end.
T or F: A non-electric firing system consists of crimpers, electric blasting cap, M81 igniter and safety fuse
False
What item of equipment would you use to check the continuity of an electrical firing system?
Galvanometer
The M81fuse igniter can be used to initiate what?
Safety fuse of shock tube
What is the minimum wait time prior to investigating a misfire involving a Primadet if the shock tube initiated to the cap, but the cap did not go off?
30 minutes
T or F: You can use a multimeter to test blasting caps
False
What is the difference between civilian and military blasting caps?
Military caps are more powerful and less sensitive. Civilian caps are more sensitive but less powerful
Why are copper blasting caps dangerous?
They date back to pre-WWII and usually develop dangerous explosive salts
If two or more caps are combined, what must they be?
Of the same type and manufacturer
How many places should you weigh down time fuse?
In 2 places to avoid it curling up on itself
What is sensitized Det cord considered?
A booster, not an initiating cap
What are the advantages and disadvantages of a non-electric time fuse firing system?
Advantages: Minimum equipment, not subject to premature detonation. Disadvantages: No control after initiation, 60 min wait plus burn time for a misfire
What are the advantages and disadvantages of a non-electric Primadet system?
Advantages: Minimum equipment, positive control, no premature detonation. Disadvantages: Have to collect expended tube, 30 minute wait time for misfire
What is the misfire wait time for an electrical misfire?
30 minutes
What does the “C” mean when referencing plastic explosives
Grams per square inch
