(f) Attach an M81 Igniter to the cut-off end of
(d) Every splice in shock tube reduces the reli-
the shock tube spliced to the blasting cap in accordance
ability of the priming system. Keep the number of splic-
with standard operating procedures.
es in a shock tube line to a few as practicable.
(2) The following is the proper splicing procedure
for shock tube:
Unused portions of M12 and M13 will not
(a) Use a sharp knife or razor blade to cut ap-
be retained for reuse. Unused portions will
proximately 3 feet from the previously cut-off end of
be initiated on demolition range or returned
left-over shock tube.
to ASP for disposal. Prior to disposition,
shock tube must be certified as inert. Shock
tube can be verified as expended using M81
or a commercially available reusable de-
Dispose of the cut off 3-foot piece of shock
tube in accordance with local regulations on
such flammable items.
g. Replacing Damaged Blasting Cap Holder on Inert
M12 Shock Tube Assembly.
(b) Cut off the free, sealed shock tube end of the
cap to be extended with a sharp knife or razor blade. Re-
move the "J" hook from M11 and M16 caps with the cut-
FAILURE TO FOLLOW REPAIR PRO-
off shock tube.
CEDURES CAN DAMAGE INERT
BLASTING CAP OR REPLACEMENT
(c) Place two free shock tube ends parallel and
tubes to tighten the knot, but not so tight as to significant-
ly deform the shock tube in the knot.
(1) Gently spread the two side walls outward by
applying outward pressure with thumbs.
(2) After opening holder, lift out inert blasting
Discard damaged holder.
Open replacement holder.
Figure 2-5.2 - Overhand knot.
(5) Place front end of inert blasting cap against
forward wall in holder.
(6) Align crimped portion of cap onto the top of
(d) Push one of the free shock tube ends to be
small locking ridge.
spliced firmly into one of the pre-cut splicing tubes.
Push the other shock tube end firmly into the other end of
(7) Press down to secure inert blasting cap.
the splicing tube at least 1/4 inch.
(e) Spool out the desired length of shock tube
and cut it off with a sharp knife or razor blade.