Ariz. Admin. Code § R11-1-265 - Loading of Blasting Agents
General:
1. All
fittings used in the construction of the hopper and pickup equipment and hose
connections of loading equipment must be constructed of materials compatible
with the ammonium nitrate composition.
2. Blasting agents shall not be blown into
boreholes that contain electrically nonconductive liners, even if the primer is
not inserted until after the blowing has been completed.
3. Primers which contain a blasting cap,
electric blasting cap or delay electric blasting cap shall not be handled by
persons who have previously been operating pneumatic loading devices unless
that person has grounded himself to bleed off any static charges.
4. Loading in boreholes containing electric
blasting caps, delay electric blasting caps, or blasting caps:
a. All pneumatic and air-pressure equipment
used for loading blasting agents must be adequately grounded to dissipate
static electric charges that may cause premature initiation of the detonator.
The machine or hopper, discharge hose, fittings, discharge tube, and loading
tube must form a continuous electrically conductive path to a ground. The
system ground conductor and loading tube shall have a resistance high enough to
prevent hazards from stray currents, yet low enough to adequately maintain
static electricity energy below hazardous levels.
b. Water lines, air lines, fan lines, rails,
or the permanent grounding system shall not be used as a ground for pneumatic
loading equipment.
c. Loading
equipment mounted on a car and rails must be thoroughly insulated from the car
and rails and grounded by a separate, static-dissipating ground.
d. When loading over electric blasting cap
wires, contact between any metal parts of the loader and cap leg wires shall be
avoided.
e. Metal or other low
electrical resistance loading tubes shall not be used.
f. All loading equipment must be removed from
the area before leg wire shunts are removed and the loaded holes are tied in
for blasting.
g. Ventilation --
When ammonium nitrate blasting agents are used, Section
27-411 of
the Arizona Mining Code shall apply.
Notes
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