A MISFIRE WILL BE APPROACHED
BY THE PERSON IN CHARGE, OR
WHO HAS THE MOST KNOWLEDGE
· When preparing and using an
OF THE FIRING SYSTEM INVOLVED.
electric ignition train, all applicable
A SECOND PERSON WILL ACT AS A
safety precautions in paragraph 5-7
will be observed.
A misfire may occur in spite of all precautions.
·Squibs and firing wiring will be
Therefore, working on or near a misfire is the most
tested prior to preparation of the
hazardous of all disposal operations. One qualified
ignition train; squibs in the same
person will examine the misfire with a second qualified
manner as electric blasting caps in
person acting as a safety backup. The safety backup
paragraph 5-8b; firing wire in
will stay clear of the immediate danger area. He will
accordance with paragraph 5-8c.
utilize natural barriers or obstructions for protection, but
remain in a position to observe the actions of the person
(1) Attach M1 flash-vented squib lead
examining the misfire. He will be prepared to go to the
wire to firing wire.
aid of the person examining the misfire if an accident
(2) Secure bag to squib by taping top of
bag to squib lead wires.
5-25. PREVENTION OF NONELECTRIC MISFIRES
All safety precautions will be followed In
(3) Insert bag into combustible material
addition, the probability of a misfire may be reduced if
the following procedures are adhered to:
(4) Attach firing wire to blasting
a. Prepare all initiators properly, ensuring use of
machine and operate in accordance with paragraph 5-
proper blasting cap.
b. Place charges carefully.
c. Place initiator properly.
WAIT AT LEAST 30 MINUTES AFTER
d. Perform any tamping operation with care to
IGNITION BEFORE APPROACHING
avoid damage to an otherwise carefully prepared
IF IT CAN BE
POSITIVELY ASCERTAINED THAT
e. Ensure time blasting fuse is ignited prior to
ELECTRICAL IN NATURE, AND IT IS
POSITIVELY KNOWN THAT THE
EXPLOSIVES ARE NOT BURNING,
f. Fire charge according to proper technique.
CORRECTIVE ACTION MAY BE
g. If possible, a dual firing system will be used. If
both initiators are properly assembled, the possibility of
a misfire is reduced to a minimum.
The above warning applies to all
nonelectric firing systems, all dual
5-26. HANDLING NONELECTRIC MISFIRES
systems (figs. 5-23, 5-24, 5-25, and 5-
26), and to detonating cord primed
Nonelectric misfires will be handled as follows:
with nonelectric blasting caps. An
exception is made only for single
a. Nonelectric Blasting Cap Misfire.
electrical firing systems (one firing
circuit) and single detonating cord
firing systems primed with an
(1) Allow a minimum of 30 minutes after
electric blasting cap.
expected detonation before starting investigation.