Surge Pile Safety - Mine Safety and Health Administration · awareness of surge-pile hazards and of...
Transcript of Surge Pile Safety - Mine Safety and Health Administration · awareness of surge-pile hazards and of...
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Surge Pile Safety
Mine Safety and Health Administration
Directorate of Technical Support
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Surge-Pile Hazards...
• Feeding material
acts like
“quicksand.”
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Surge-Pile Hazards...
• The edge of the
drawhole is
unstable.
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Surge-Pile Hazards...
• Poor visibility
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Surge-Pile Hazards...
• The danger of hidden
cavities.
• Since 1980, 19 persons
have died in surge pile
accidents.
• Most of the accidents
have involved a hidden
cavity created when
material “bridged”
over a feeder.
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Causes of “bridging” over a surge-pile feeder
• Bridging can occur when
equipment compacts the
material at the surface of
the pile.
• Bridging can occur if the
surface material freezes.
• In a pile that has sat idle for
a period of time, the pile
material tends to “settle in”
and become more prone to
bridging.
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Surge-Pile Accidents
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Loveridge Accident - Five Victims
In 1986, five men died when bridged material underneath them collapsed into a hidden
cavity on a surge pile in WV. The men had gone onto the pile on-foot to try to
determine how best to repair the damaged overhead belt.
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Loveridge Accident: This is a section of the surge pile showing the position the
hidden cavity, and the location of the five victims and two witnesses.
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In this fatal surge pile accident a dozer fell into a hidden cavity. Note the
dozer tracks passing over the cavity.
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Here’s the dozer buried in cavity. Note the thickness of the material that had been
bridged over.
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Note the partially buried bulldozer in this fatal accident in Pennsylvania. A
hidden cavity collapsed under the dozer while it was pushing coal on the pile.
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• In most of the fatal
accidents the
dozer operator
was kill when the
dozer cab windows
either broke, or
were pushed into
the cab, allowing
coal to fill the cab.
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Close-up of cab filled with coal.
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Rescue efforts in a surge pile accident. Unstable material can endanger
rescue workers.
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More Recent Surge-Pile Accidents
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Sidney Coal Accident - March, 1998
Blade of Buried Dozer
Here a buried dozer is being dug out to rescue the operator.
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Sidney Coal Accident
The dozer cab was buried by approximately 12 feet of coal; the cab windows had been
upgraded to a degree; the windows held; the operator was rescued.
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Fatal Accident in Virginia - Nov. 1998
This bulldozer went into a cavity while pushing coal away from the stacker. The orange ball marks the location of a feeder.
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Virginia accident - This sketch, and the following two slides, show the surge pile layout and the
conditions when the accident occurred.
#4 #3 #2 #1
50' 50' 50'
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#4 #3 #2 #1
50'50' 50'
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Virginia Accident: The hidden cavity had been created by gravity discharge through an ungated
vibratory feeder.
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Elk Run Fatality - April, 1999
Elk Run Fatal Accident: Each stacker tube had two feeders. The accident occurred
while the dozer operator was pushing clean coal away from a stacker.
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Elk Run Fatality
The dozer broke into hidden cavity; coal filled the cab; the windows broke in.
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Zeigler Central Cleaning Plant Incident - May, 2000
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Zeigler raw coal surge pile. Cross-section showing one stacker tube and three feeders.
The pile was approximately 35 ft. high; the dozer fell into a void over the No. 3 feeder.
Tunnel
Coal Pile
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Zeigler case: That’s the dozer blade. The rest of the dozer is in a cavity
over the No. 3 feeder.
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Fortunately, the sides of the cavity held up and the operator was able to get out of the
cab, climb up on the blade, and narrowly escape injury.
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The feeders had been idle for a week while coal was spread on the pile using a D10. There
were clayey fines in the coal...
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“Pushing coal on a surge pile is the most
dangerous job at a prep plant.” Prep Plant Superintendent
• The job of pushing coal on a surge
pile is made difficult by:
• changing conditions…
• layout of stackers and feeders…
• time pressures...
• limited visibility…
• limited space…
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Best Practices:
Ways to Improve Surge-Pile Safety
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Best Practices: Surge Pile Safety
• Provide equipment cabs strong
enough to resist burial pressures.
• Or use remote-control equipment.
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The coal has broken or pushed in the cab windows and filled the cab...
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Windshield pushed back into cab. Note: orange object under windshield is an SCSR...
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Available Solutions for Stronger Cab Windows...
• MSHA initiative: use of very high-strength glass…
• Massey approach: add supports to the inside of the
cab windows - combined with using somewhat
stronger glass...
• Use of polycarbonate windows... (Adequate strength;
support around edges needs to allow for higher
deflection; issue of scratch-resistance…)
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Testing of Very High-Strength Glass at PPG Plant
Huntsville, Alabama
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Test fixture - size and shape of D9 rear dozer window
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Test Results:
D9 rear window held a
pressure of 40 psi for
over 2 hours - at a glass
temperature of 105
degrees - without
breaking.
Note that 40 psi is
equivalent to the pressure
of being buried under
about 35 feet of coal. This
value was determined
based on applying a factor
of safety to the conditions
observed in surge-pile
accidents.
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Field Burial Demonstration
Federal No. 2 Mine
near Morgantown, WV
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High-strength glass installed using urethane adhesive.
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High-strength glass installed in all cab windows of test dozer.
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Dozer with high-strength glass being buried in coal pile… (1 or 4)
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Dozer burial - 2 of 4
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Dozer burial - 3 of 4
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Dozer burial - 4 of 4
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Buried dozer being dug out...
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Checking windows after burial.
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High-strength glass intact after burial demonstration.
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The Massey Approach
Use somewhat stronger
glass and install support
bars on the inside of the
cab windows.
The supports for the
right-side door window
are shown here.
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Horizontal support
bars and additional
edge support for the
windshield are shown
here.
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Massey’s successfulburial demonstration.
The glass cracked but it
held the coal out of the
cab.
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Contrast this scene after the Massey demonstration - where coal was held out of the cab - with...
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This scene from an accident, where coal has filled the cab...
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New West Virginia Surge Pile Rule
• Title 36, Series 27, Section 5
• Effective January 1, 2001
• “All mobile equipment operated on a surge
pile shall be equipped with an enclosed cab
fitted with…a window support system or
glass certified to withstand 40 psi…”
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Best Practices: Surge Pile Safety
• Equip the cab
to allow a
rescue in the
event of an
accident.
• Provide self-
rescuers (shown
here mounted
above operator’s
head), radio
communications
and lighting...
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Best Practices: Surge Pile Safety
• Provide gates on feeders - or otherwise
ensure that coal cannot discharge when a
feeder is not activated.
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Type of feeder at Virginia accident
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WITH VIBRATOR OFF
Cross-section of feeder. With the vibrator off, no coal should discharge on to the belt.
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WITH VIBRATOR ON
Cross-section of feeder. With the vibrator on, coal should discharge on to the belt.
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STATIC OFF
DYNAMIC ON
VIBRATORY FEEDERThis is a different style
of feeder, but it works
on the same principle.
In this case, when the
vibrator unit is turned
off, the material comes
to rest in the chute at
its static angle of
by the red line.
When the vibrator is
started, the material
vibrates to its flatter,
dynamic angle of
through the end of the
chute onto the
conveyor belt.
ANGLE OF REPOSE - VIBRATOR
ANGLE OF REPOSE - VIBRATOR
repose - represented
repose - and drops
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Best Practices: Surge Pile Safety
• Provide the feeder operator with the
capability to directly observe the conditions
and activities on top of the pile.
– Install closed-circuit TV if necessary.
– Use with warning lights over feeders. For example, the feeder
operator could turn on a flashing red light over the appropriate feeder if he activated
a feeder and did not see a drawhole develop. This would warn everyone to stay away
from that feeder because a cavity was suspected.
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Camera monitoring a covered
surge pile at a copper mine.
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Feeder control room
with TV monitors
Monitors for surge pile
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Best Practices: Surge Pile Safety
• Mark the locations of the feeders.
Yellow markers
suspended above
feeders
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Best Practices: Surge Pile Safety
• Provide visual indicators of which feeders are active.
Lights above
feeders.
feeder is active.
Light
“on” indicates
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Best Practices: Surge Pile Safety
• Provide the mobile equipment operator
with the capability to remotely shut-down
the stacker and feeder belts from the
equipment cab.
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Example: Transmitter for shutting down stacker and feeder
belts at coal mine in WV. Various products are available with
this capability.
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New WV Surge Pile Rule
• Title 36, Series 27, Section 5.
Effective January 1, 2001
• “In addition, the cab shall be equipped with...
a remote-control device capable of stopping
the flow to and from the feeder;…”
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Best Practices: Surge Pile Safety
• Prevent persons from being on
foot on a surge pile - provide
warning signs.
• Be especially alert for new
miners, and contractor
personnel, who may not be
familiar with the dangers.
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Best Practices: Surge Pile Safety
• When working near
a drawhole, always
keep the equipment
facing the drawhole.
• Keep the drawhole
nearly full during
loadout. This prevents
getting into a situation where
dozers are pushing material
into a deep drawhole.
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Best Practices: Surge Pile Safety
• Dealing with cavities…
• Have a system to detect cavities and warn all affected parties.
• Take measures to ensure that no one is exposed to the hazard.
• Use safe procedures to eliminate a cavity.
• Based on experience, normally the most effective way to eliminate a cavity, or to
rescue an operator trapped in a cavity, is to begin to excavate material at a safe
distance off to the side of the cavity and work toward the cavity.
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Other Best Practices - Surge Pile Safety
• Avoid operating equipment near the feeders. Operating near the
feeders packs the material and makes it more prone to bridging.
• Provide adequate training for all surge pile workers. Of special
concern are new miners and workers, such as contract personnel, who may
only occasionally deal with the surge pile and may not understand the
danger.
• Minimize bulldozer safety problems in designing new surge piles
and in modifying existing piles. Design surge piles to decrease the
dangers of having mobile equipment work near feeders. Close and seal off
feeders where possible. On new piles, provide areas around stackers where
the dozer can push coal without being near or over a feeder.
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Everyone involved with surge piles should keep this image in mind. By
following the “Best Practices,” surge pile accidents can be eliminated.
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The preceding information is intended solely for the purpose of raising the
awareness of surge-pile hazards and of measures that can be taken to prevent surge-
pile accidents. The Federal standards for surge-piles are contained in 30 CFR Parts
56, 57, 75, and 77.
The following safety videos are available from the National Mine Health and Safety
Academy (304-256-3257).
• “Hazards of Coal Stockpiling Operations,” VC-831, 1994.
• “Hazards and Safety Practices on Surge Piles,” VC-859, 1997.
• “Hidden Dangers: Safety Improvements for Surge Piles,” VC-950, 2000.
Additional surge-pile safety information can be found under the “Accident
Reduction Program (ARP)” on MSHA’s web page at www.msha.gov.