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Safety for Aluminum Processing andFinishing Operations Involving
Combustible Dust
in the
Die Casting Industry
Unit 3
NADCANorth American Die Casting Association
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Enabling Objectives
Explain procedures for housekeeping, dust collection,
fire prevention, prevention of accumulation of
fugitive dusts, proper storage, and safety
procedures for aluminum and magnesium.
After completing this section
of the course studentsshould be able to:
Discuss aluminum dust
producing operations andthe precaution for carrying
out these operations safely
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Two recognized methods to
capture aluminum dust: Wet collectors located near the point
of generation
Dry collectors located outdoors as
near as possible to the point of
generation
Machines fitted with hoods and
capture devices able to capture and
transport al l the dus t that is
produced
Dust Producing Operations
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Design system so all dust
moves into the hoods, into
the ducts and is collected
Connecting ducts must
be kept as straight and
short as possible
Dust Producing Operations
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Ductwork
Duct runs as short &straight as possible!
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Metal dust-air
suspension can pass
into the explosive
range in the
collector!
Dust Producing Operations
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Dry-type provided with
barriersor other protection
Area around collector
posted with Caution Sign
Personnel outside of
marked area when
operating
CAUTION:
This dust collector can
contain explosible dust.
Keep outside the
marked area while
equipment is
operating.
CAUTION
CAUTION
This d tcollec
torcan c
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Dedicated equipment not to
be used with other types of
metals
Grinders, buffers posted
with warning sign!
Warning:
Aluminum Metal Only
Fire or Explosion CanResult with Other Metals.
!
Warning:
Aluminum Metal
OnlyFire or
Explosion Can
Result with
Other Metals.
Hi Aluminum!
Im another type
of metal!
Kaboom
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Practice Quiz
1. Duct runs for dust collectors should be: A. As far away from the machine feeding into it as possible.
B. Build with curves and turns to slow down the movement
of dust.
C. As short and straight as possible. 2. When dry-type dust collectors are operating:
A. They should be indoors near the point of generation.
B. Barriers should be established and personnel should stay
away.
C. Maintenance personnel should open them up to ensure
they are working properly.
Dust Producing Operations
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Practice Quiz
3. Grinders and buffers used for aluminum must be: A. Dedicated equipment.
B. Used for all types of metal including stainless steel
C. Disconnected from dust collection units when used for
other metals.
Dust Producing Operations
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Practice Quiz
1. Duct runs for dust collectors should be: A. As far away from the machine feeding into it as possible.
B. Build with curves and turns to slow down the movement
of dust.
C. As short and straight as possible. 2. When dry-type dust collectors are operating:
A. They should be indoors near the point of generation.
B. Barriers should be established and personnel should
stay away.
C. Maintenance personnel should open them up to ensure
they are working properly.
Dust Producing Operations
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Practice Quiz
3. Grinders and buffers used for aluminum must be: A. Dedicated equipment.
B. Used for all types of metal including stainless steel.
C. Disconnected from dust collection units when used for
other metals.
Dust Producing Operations
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Cyclones are less
hazardous than bag-
or media-type
Exhaust discharge to
atmosphere away
from other operations!
Portable Dust Collectors
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Fixed Media
Type Dust
Collector
NOT the best choice!
Material
Discharge
Filtration Media
Build a
barrier
around the
equipment!
Dust Producing Operations
Dry collectorsrequired to be
located outdoors
(exception: small
portable units
Dry co l lecto rs
prov ided w i th
barr iers
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Dust Collection, Ducts and
Ductwork
Collector area is to bemarked and a sign
posted
NFPA 68: length of afireball from a vented
collector
Collection system
dedicated to
aluminum only!
This dust collector can
contain explosive dust,
keep outside the marked
area while equipment is
running
20'
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Experts indicate an eventual explosion can
be expected from bag collectors use for
aluminum fines!
Multiple-series cyclone with final liquid stageis
a better choice
Not so good
Can lead to Im a better choice
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Dust Collection, Ducts and
Ductwork
If the collectionsystem used for
combustible
aluminum dust isused for other
materialsit should
be disassembled
and cleanedbefore
and after.
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Dust Collection, Ducts and
Ductwork
Use separate collection
systems for grinding
and buffing operations
The dust collector
should dissipate static
electricity
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For bag-house shake-out
design to minimize sparking
Pulse-types less likely tocreate a spark because there
are no moving parts
Attach ground wires to
bagsand securely ground
Dust Collection, Ducts and
Ductwork
Mechanical Shaker Baghouse
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For baghouse an alarm sounds
for pressure drop across bags
Locate baghouse or mediatype collector > 50 feet from
other operations and
buildings!
Keep personal > 50 feet away
when shaking!
Dust Collection, Ducts and
Ductwork
At least Im outside!
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Avoid letting aluminum
impact oxidized iron!
Thermite reaction possible
for impact with aluminum &
rusted iron or steel
Enough heat to produce
molten iron!
Thermite Reaction
Laboratory created
thermite reaction
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Practice Quiz
1. Baghouse collectors for aluminum: A. Are both economical and efficient.
B. Are considered better than cyclone collectors.
C. Have been associated with fires when used for aluminum.
2. If aluminum impacts iron oxide:
The material produced is inert.
A dangerous thermite reaction can be initiated.
It makes a valuable by-product that is a commodity.
Dust Collection, Ducts and Ductwork
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Practice Quiz
3. If a baghouse type collector is used: A. A pulse-type is better than a mechanical shaker.
B. The collector should be located outdoors at least 50 feet
away from buildings and other equipment.
C. Barriers and warning signs should be posted around theequipment.
D. All of the above
4. Dust collection for grinding and buffing operations
should be: A. A single unit with adequate capacity for the amount of
dust generated.
B. Located between the grinder and buffer.
Served by separate dust collection systems.
Dust Collection, Ducts and Ductwork
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Practice Quiz
1. Baghouse collectors for aluminum: A. Are both economical and efficient.
B. Are considered better than cyclone collectors.
C. Have been associated with fires when used for
aluminum.
2. If aluminum impacts iron oxide:
The material produced is inert.
A dangerous thermite reaction can be initiated. It makes a valuable by-product that is a commodity.
Dust Collection, Ducts and Ductwork
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Practice Quiz
3. If a baghouse type collector is used: A. A pulse-type is better than a mechanical shaker.
B. The collector should be located outdoors at least 50 feet
away from buildings and other equipment.
C. Barriers and warning signs should be posted around theequipment.
D. All of the above
4. Dust collection for grinding and buffing operations
should be: A. A single unit with adequate capacity for the amount of
dust generated.
B. Located between the grinder and buffer.
Served by separate dust collection systems.
Dust Collection, Ducts and Ductwork
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Explosion vents are usually
built into the system
If not a retrofit is a good idea!
Locate Explosion Vents
away from personnel!
Explosion vents for dust collectors
Explosion Venting
located away from personnel
Its a good thing!
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Ductwork
Ducts short and straight
to maximize free airflow
No dead ends or
unused caps in ductsthat could trap
accumulations of dust
Ducts grounded &
bonded to dissipate
static electricity
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Particles are suspended
Air velocity at least 4500 ft/min
Build-up of dust particles
Air velocity less than 3500 ft/min
Entrainment! is what you need!
Bad!
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Duct Construction Ducts made of
conductivematerial
Lap joints face
airflow direction
No unused or
capped outlets Duct seams
away from
personnel!
Smells
like
somethingsburning!
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Duct Construction
No add-ons without
engineering redesign of
system and the impact the
add-ons will have
Collectors and machines
that generate combustible
dust properly bonded &
grounded
Copper wire is securely fastened
to the equipment and then
grounded to earth, for example by
attaching it to a metallic water
pipe or other object connected
with earth.
Prevents
buildup
of staticcharges!
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Dust Collection & Ductwork Practice Quiz
1. Explosion vents:A. Should be built into collectors for combustible
aluminum dust.
B. Located away from personnel.
C. Not necessary under normal circumstances.
D. Both A & B.
2. Ducts for dust collectors should have:
A. Dead end sections to help collect dust at the
point of generation.
B. Unused caps to maintain duct velocity pressure.
C. No dead ends or unused caps.
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Dust Collection & Ductwork
Practice Quiz
3. Dust collectors and machines:A. Isolated from ground to prevent conducting
electricity.
B. Properly grounded and bonded. C. Designed and installed to dissipate static
electricity.
D. Both B & C.
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Dust Collection & Ductwork Practice Quiz
1. Explosion vents:A. Should be built into collectors for combustible
aluminum dust.
B. Located away from personnel.
C. Not necessary under normal circumstances.
D. Both A & B.
2. Ducts for dust collectors should have:
A. Dead end sections to help collect dust at the
point of generation.
B. Unused caps to maintain duct velocity pressure.
C. No dead ends or unused caps.
D C ll i & D k
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Dust Collection & Ductwork
Practice Quiz
3. Dust collectors and machines:A. Isolated from ground to prevent conducting
electricity.
B. Properly grounded and bonded. C. Designed and installed to dissipate static
electricity.
D. Both B & C.
Wet Type Dust Collector
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Wet-Type Dust Collector Exhaust to the outside of
building
Exhaust duct as short &
straight as possible
Ducts designed to
withstand same explosion
pressure as wet-type
collector
Wet Type Dust Collector
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Wet-Type Dust Collector
Aluminum and water canproduce hyd rogen gas
Extremely flammable and
easy to ignite
Dont trap in unventilated
areas of the building or
equipment!
Wet Type Dust Collector
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Wet-Type Dust Collector Return air tested and approved for recirculation
Exhaust vent inspected and cleaned frequently Particles can collect on the walls of the exhaust
duct and can be highly combustible
Particles Collecting on
exhaust duct
Im forming a highly combustible cake!
Wet Type Dust Collector
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Water level
sludge
Liquid level control w/ interlock
Non-sparking work surface
Liquid Precipitator Collector For Portable Dust Collector
Mist eliminator packs
Expanded metal aluminum mesh
Wet-Type Dust Collector
Sl d & C ll t S V ti
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Sludge & Collector Sump Venting
Wetted dust ishighly
flammable!
Sludge removed
regularly
Collector sump
vented!
H2H2
H2
H2
H2
H2H2
H2
H2
H2
H2H2
H2
H2
H2 H2
H2H2
H2
P S l
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Power Supply Inter locked with the
exhaust blower and
the liquid-level
controller
Time delay on dust
producing equipment
prevents motor
starting until collector
is operating
To dust producing
equipment
Power to dust-
producing eq. motor
cutoff by low liquid level
or
low airflow
Inspection/
Cleanout door
Water level
Overflow/Drain Piping
Liquid level
control w/
interlock
Sludge in tank
Mist Eliminator
Packs
My power supply is dependent on
my proper functioning
Sl d R l
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Sludge Removal
Sludge removed daily
Covered vented containers for transport
Containers filled to < 50 lbs
Sl d R l
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Sludge Removal
NO SMOKING
ALLOWED!
Mix with inert at 5:1
ratio & dispose of
properly
Hot Work
requires a Permit
use one!
W t T C ll t
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Wet-Type Collectors
Practice Quiz
1. Wet aluminum dust:A. Is inert
B. Is easily removed with steel shovels
C. Can generate explosive hydrogen gas
2. Exhaust air:
A. Should be vented to the outside
B. Should be tested if it is to be returned to thebuilding.
B. Both A & B.
W t T C ll t
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Wet-Type Collectors
Practice Quiz
3. Sludge from wet-type dust collectors for
combustible aluminum dust should be:
A. Emptied daily.
B. In containers of less than 50 lbs.
C. Covered in vented containers for disposal
transport.
D. All of the above.
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W t T C ll t
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Wet-Type Collectors
Practice Quiz
3. Sludge from wet-type dust collectors for
combustible aluminum dust should be:
A. Emptied daily.
B. In containers of less than 50 lbs.
C. Covered in vented containers for disposal
transport.
D. All of the above.
D T D t C ll t
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Dry-Type Dust Collectors
Use only where permitted
Collection containers covered to
prevent airborne fugitive dust
Collector designed and
maintained to ensure internal
cleanliness!
No accumulation of material allowed
except discharge container
D T D t C ll t
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Dry-Type Dust Collectors
Dust-collecting filter medium conductive
with enmeshed noninsulated wire
woven or fastened to it
Not fool proof:
No force passes charge across nonconductive
areas of the fabric
Broken wires can hold or build-up a charge!
D T D t C ll t
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Dry-Type Dust Collectors
Hoods regularly cleaned
Dry collectors for
aluminum dust provided
with deflagration vents
Air from dry dust
collectors is not to be
recycledback into the
building
Courtesy of
Fenwal SafetySystems
D T D t C ll t
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Dry-Type Dust Collectors Selection of type and location
of weak sections or vents
designed to minimize injury to
personnel and minimizedamage to nearby equipment &
structures
Explosion venting is a very
important consideration!
Al: high explosion pressure
Courtesy of
Fenwal Safety
Systems
Dry Type Dust Collectors
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Dry Type Dust Collectors Practice Quiz
1. Air from dry-type dust collectors: A. Should be vented back into the plant to balance negative
pressure.
B. Should be used to provide warmth around grinding
operations. Should not be recycled back into the building.
2. Grounding cartridge filters with wires built into the
cartridge :
A. Is a fool proof way of ensuring static charges will becontrolled.
B. Does not ensure that static charges will move across the
filter.
C. Never done.
Dry Type Dust Collectors
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Dry Type Dust Collectors
Practice Quiz
3. Dry type dust collectors should:A. Have their hoods regularly cleaned.
B. Be fitted with deflagration vents.
C. Allow for no accumulation of dust exceptfor in discharge containers.
D. All of the above.
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Dry Type Dust Collectors
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Dry Type Dust Collectors
Practice Quiz
3. Dry type dust collectors should:A. Have their hoods regularly cleaned.
B. Be fitted with deflagration vents.
C. Allow for no accumulation of dust exceptfor in discharge containers.
D. All of the above.
Additional Considerations
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Additional Considerations Cutting tools sharp & sufficient
coolant flow to prevent ignitionof turnings
Cutting & grinding eq. grounded
Chips, swarf, turnings, etc.
collected in closed-top
containers
Removed daily to safe storage
or disposal
Additional Considerations
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Additional Considerations
Coolant non-flammable & filtered
Collected solids max accumulation 5
gallons
Additional Considerations
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Additional Considerations
All electrical wiring conforms to NEC
Collection systems bonded &
grounded
Metallic jumpers installed when
continuous contact is interrupted
NEC
NFPA 70
Ho sekeeping
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Housekeeping
No accumulation of
fugitive combustible dust
Ignition of a dust cloud or
layer will likely result inan explosion
Often followed by a more
violent explosion
Good housekeeping is
extremely important!
Housekeeping
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Housekeeping Regular cleanup using
conductive non-sparkingtools
Soft brooms with natural
bristles Bulk of cleanup done with
scoops, shovels & brooms
Vacuum only small residualamounts
Non-sparking
Housekeeping
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Housekeeping
Compressed air blow down is
generally not to be permitted
Only allowed in areas otherwise
impossible to clean Only allowed under carefully
controlled conditions
All potential ignition sources
eliminated
All equipment shut down
Vacuum Cleaners
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Vacuum Cleaners Vacuums only for too small,
dispersed or inaccessibledust
Bonded & grounded
Listed or approved for usewith combustible dust
Periodic continuity tests
performed Dusts from fixed vacuums
collected to outside of
building
Fixed Vacuum Systems
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Fixed Vacuum Systems If possible locate
vacuum collectionoutside facility
50 feet from building
If closer enclose in
open-top steel shield
Fit suction lines withexplosion vents and
anti-flash back valves
50 ft
.
Water Cleanup Considerations
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Water Cleanup Considerations Wet aluminum fines can evolve
hydrogen gas!
Keep hydrogen at or below 1%
concentration in air usingventilation (H2LEL = 4%)
Inform management of risks
Competent person has
determined wet cleaning is
safest method availableApplies to Aluminum
Dross: Wet or Hot
Cleaning Frequency
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g q y
Avoid excessive accumulation of dust on any
portion of building that is not cleaned during
regular daily operations
Regular cleaning of buildings and machinery asneeded
Machines idle and
power off
Housekeeping
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p g
Practice Quiz
1. Cleanup of aluminum dust should be done
with:
A. Non-combustible conductive tools.
B. Brooms with soft natural bristles.
C. Mostly scoops, shovels and brooms.
D. All of the above.
2. Compressed air blown for aluminum dust:
A. Is a fast and safe way to clean up.
B. Is a common practice.
C. Should only be done under controlled
procedures when no other method is feasible.
Housekeeping
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p g
Practice Quiz
1. Cleanup of aluminum dust should be done
with:
A. Non-combustible conductive tools.
B. Brooms with soft natural bristles.
C. Mostly scoops, shovels and brooms.
D. All of the above.
2. Compressed air blown for aluminum dust:
A. Is a fast and safe way to clean up.
B. Is a common practice.
C. Should only be done under controlled
procedures when no other method is feasible.
Housekeeping
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p g
Practice Quiz
3. Cleaning dust from the facility should:
A. Include additional cleaning on all parts of the
building where dust can accumulate that is not
cleaned during normal operations.
B. Be done as often as necessary. C. Be done with machines idle with the power off.
D. All of the above.
Fire Prevention & Protection
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Fire Prevention & Protection Large scale fires in
aluminum dust are verydifficult to extinguish
DO NOT create a dust
cloud in an attempt to fight
an aluminum dust fire!
Attempt to control asquickly as possible with
minimum disruption to the
pile
Fire Extinguishers
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Fire Extinguishers
Ample Class D fire
extinguishers should be
available to fight incipient
stage fires
Available within 75 feet of
metalworking areas.
Required where dust is
generated at least once every
two weeks
Fire Extinguishers
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Fire Extinguishers
Install signsso other
types of extinguishers are
not used by mistake!
Extinguishing Agent
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g g g
Ring incipient fires with
dry sand, or a Class D
powder
Properly ringed will form ametal oxide crust
Apply with non sparking
utensils
Eliminate drafts, etc.
Extinguishing Agent
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g g g
Dry sodium chloride is very effective
Check for caking
Flux made of potassium and magnesium
chloride and calcium fluoride Avoid Class B agents for dry powder aluminum
fires, they will accelerate
fires or cause an explosion!
Aluminum Slurry Fires
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Aluminum Slurry Fires
Incipient stage fires
involving a slurry
(wetted) of aluminum
powder can be foughtusing a Class B type
extinguisher as long
as the agent is not
halogenated.
Sprinkler Systems
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p y
No automatic
sprinklers where dryaluminum powder is
produced or handled
Consider the hazards
associated with
aluminum and water in
considering sprinkler
systems
Fire Prevention and Protection
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Practice Quiz
1. Large aluminum fires:
A. Can be easily controlled with class D fire extinguishers.
B. Are extremely difficult to extinguish.
C. Are best handled with class B fire extinguishers.
2. Incipient stage aluminum fires:
A. Should be ringed with a Class D extinguishing agent.
B. Should have extinguishing material applied with non-
sparking scoops.
C. Should be protected from drafts.
D. All of the above.
Fire Prevention and Protection
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Practice Quiz
3. Class D fire extinguishers
A. Are optional for aluminum dust processing
areas.
B. Only needed by the dust collector.
C. Are required where combustible dust is
produced at least once every two weeks.
Fire Prevention and Protection
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Practice Quiz
1. Large aluminum fires:
A. Can be easily controlled with class D fire extinguishers.
B. Are extremely difficult to extinguish.
C. Are best handled with class B fire extinguishers.
2. Incipient stage aluminum fires:
A. Should be ringed with a Class D extinguishing agent.
B. Should have extinguishing material applied with non-
sparking scoops.
C. Should be protected from drafts.
D. All of the above.
Fire Prevention and Protection
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Practice Quiz
3. Class D fire extinguishers
A. Are optional for aluminum dust processing
areas.
B. Only needed by the dust collector.
C. Are required where combustible dust is
produced at least once every two weeks.
Employee Training & Emergency Evacuation
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Train employees in
evacuation procedures
Only trained
employees are al lowed
to attempt to f igh t f ires
All others must
evacuate!
Fire Safety Training
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Familiarize fire departments
with the special potential
hazards present
Plant safety officer to
provide instruction or direct
the efforts of fire personnel
Scrap metal fire
Will burn until it
runs out of fuel
Fire Safety Training
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Job hazard analysis
should be conducted
and safe work practices
developed
Employees trained on
hazard recognition,
elimination and control
Dont let this happen to you!
Fire Prevention & Control
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Fire Prevention & Control
Set up test fires for f i re
department train ing
Cover foreseeable
scenarios and plan and
prepare accordingly
Train employees for thedifferent types of fires
possible
Fire Prevention & Control
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Fire Prevention & Control Train employees on the
hazards present
Focus on proper actions,
decisions & procedures Train on location of
controls, emergency
supplies and fire
extinguishers
The stuff you NEED!
Fire Prevention & Control
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Fire Prevention & Control Train on proper
method for fighting
incipient stage
aluminum dust fires
Warn employees
regarding the creation
of a dust cloud or using
liquids on combustible
metal fires
Fire Prevention & Control
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Practice Quiz
1. If you have not been trained you should:A. Only fight a major fire with coworkers who haveexperience.
B. Only attempt to extinguish incipient fires.
C. Not attempt to put out combustible dust fires.
2. Your training should focus on hazard:
A. Recognition.
B. Elimination.
C. Control.
D. All of the above.
Fire Prevention & Control
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Practice Quiz
1. If you have not been trained you should:A. Only fight a major fire with coworkers who haveexperience.
B. Only attempt to extinguish incipient fires.
C. Not attempt to put out combustible dust fires.
2. Your training should focus on hazard:
A. Recognition.
B. Elimination.
C. Control.
D. All of the above.
Fire Prevention & Control
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Practice Quiz
3. It is important not to:A. Put liquids on aluminum dust fires.
B. Use a high pressure extinguisher that will create
a dust cloud.
C. Use the wrong type of fire extinguisher.
D. All of the above.
E. None of the above.
Fire Prevention & Control
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Practice Quiz
3. It is important not to:A. Put liquids on aluminum dust fires.
B. Use a high pressure extinguisher that will create
a dust cloud.
C. Use the wrong type of fire extinguisher.
D. All of the above.
E. None of the above.
Controlling Ignition Sources
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No smoking, cutting or
welding in areas where
wet sludge is present
Any area where hotwork takes place must
be free of all
accumulations of dust
Comply with NFPA 51B
Employees and visitors
should not carry smoking
materials in any areas wherecombustible dust is present!
Controlling Ignition Sources
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No propellant-actuated
tools unless machinery
is shutdown and
cleaned Only non-sparking tools
used on machines
where combustible dust
is present
Controlling Ignition Sources
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Do not dress grinding
wheels when the
collection ventilation is
on!
Cleaning Tools
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Brooms & brushes
natural fiber bristles
No synthetic bristles
Scoops and dustpans,
etc. to conductive & non-
sparking Do not return dry
sweepings to processing
Proper PPE around Combustible Metal Dust
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p
Except for working around
electricity, safety shoes
should be worn with
Soles and heels attached bysewing
No nails or metal plates
Safety toes composite or
covered
Shoes static dissipating
Specialstatic
dissipating
shoe
Proper PPE around Combustible Metal Dust
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Clothing clean, flame
retardant and non-staticgenerating
Tight fitting, smooth fabrics
from which dust can easilybe should be used
No cuffs or other folds
where aluminum couldcollect
No wool or silk
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Compressed air & inert gas
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Dont mistake plant
air for inert gas!
Fittings for both shall
not be
interchangeable!
Safety Inspections
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y p
Inspection program
for operations that
produce dust!
Performed on a regular
interval
Skilled inspectors
Reports filed
Deficiencies corrected!
Controlling Ignition Sources
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Practice Quiz
1. No smoking, cutting or welding in areas:A. Accumulations of dust are present.
B. Where wet aluminum is present.
C. Where powder actuated tools are approved. D. All of the above.
E. A & B only.
2. Do not dress grinding wheels if:A. If the ventilation system is turned off.
B. If the ventilation system is still turned on.
C. Neither A nor B.
Controlling Ignition Sources
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Practice Quiz
1. No smoking, cutting or welding in areas:A. Accumulations of dust are present.
B. Where wet aluminum is present.
C. Where powder actuated tools are approved. D. All of the above.
E. A & B only.
2. Do not dress grinding wheels if:A. If the ventilation system is turned off.
B. If the ventilation system is still turned on.
C. Neither A nor B.
Emergency Procedures
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Practice Quiz
3. Emergency procedures:A. For clothing fires needs to be implemented
B. Include fire blankets and their use where water is
not permitted. C. Are often overrated and usually not necessary
D. A & B only.
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PPE
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Practice Quiz
4. Clothing should be:A. Clean.
B. Non-static generating.
C. Flame Retardant. D. All of the above.
E. B & C only.
PPE
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Practice Quiz
4. Clothing should be:A. Clean.
B. Non-static generating.
C. Flame Retardant. D. All of the above.
E. B & C only.
Summary
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In this section we discussed safe practices for
machining and finishing aluminum. We identified the importance of safe meansof dust collection We looked at housekeeping issues Fire prevention and fire protection were also
discussed
We also examined proper cleaning tools andthe correct PPE to wear when working around
aluminum where combustible dust is present
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