Common Safety Issues in Grain Elevators · 2019-12-19 · checklist evaluation approach ... Areas...
Transcript of Common Safety Issues in Grain Elevators · 2019-12-19 · checklist evaluation approach ... Areas...
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Common Safety Issues
in Grain Elevators
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Joe Mlynek CSP, OHST
Safety Consultant
Partner/Content Expert
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Five Hazards that can Seriously Injure or
Kill a Grain Handling Worker
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Number One: Grain Engulfment
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Develop a zero-entry mentality
“where grain engulfment hazards exist”
Exhaust all options to eliminate the
need to enter, regardless of costs
Zero Entry Mentality
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Bin-Entry/PRCS Permit
Permit “Permission”
Think of it as a checklist evaluation approach
Consider layered approval process
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“All mechanical, hydraulic, and pneumatic equipment which presents a danger to employees inside grain structures must be de-energized, and shall be disconnected, locked-out and tagged, blocked off, or otherwise prevented from operating by other equally effective means.”
Sweep Augers – 10 Sweep Auger Safety Principles if accepted by your state
Lockout Tagout
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Atmospheric Testing
The atmosphere must be tested for the presence of:
“Combustible gases and vapors when there is reason to believe that they may be present;”
“Toxic agents when there is reason to believe that they may be present (i.e. phosphine)”
Oxygen unless there is:
“continuous natural air movement or;”
“continuous forced air ventilation before and during the entry.”
Don’t use exceptions within the standard
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A body harness or boatswain’s chair attached to a lifeline are required
when:
“An employee enters a grain storage structure from a level at or above the
level of grain products.”
“An employee walks or stands on or in stored grain at a depth which poses
an engulfment hazard.”
Take a stance, don’t enter bins where there is an engulfment hazard.
Precautions
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The lifeline:
“Must be positioned and of sufficient length to prevent the employee from sinking further than waist deep in grain.”
Exception “ Where the employer can demonstrate that the protection required are not feasible or creates a greater hazard the employer can provide an alternative means of protection against sinking further than waist deep in grain.”
Lifelines
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Understand Angle of Repose
Definition – The steepest angle of descent or dip relative to the horizontal plane to which a material can be piled without slumping.
At this angle the material on the slope face is on the verge of sliding.
The angle of repose can range from zero to ninety degrees.
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Understand Angle of Repose
A material with a low angle of repose forms flatter piles than a material with a high angle of repose.
Steepest angle at which an object can rest on an inclined plane without sliding down.
Teach people to identify angle of repose. Include on permit.
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Understand Angle of Repose
Corn – Approximately 21.5 - 23
degrees
Soybeans – Approximately 25
degrees
Wheat - Approximately 25 degrees
Oats – Approximately 28 degrees
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Rescue Equipment
“Employer shall provide
equipment for rescue
operations which is
specifically suited for the
bin, silo, or tank being
entered.”
Train on response
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Engulfment Prevention
Foster a zero-entry mentality
Be consistent in approach
Develop an inventory of spaces
Evaluate each space for hazards
Develop procedures for entry
Use a permit with a focus on
hazard analysis
Consider rescue – non-entry, entry
Train employees
Evaluate the program annually
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Number Two: Combustible Dust
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12 Grain Dust Explosions reported in the U.S. in 2018
Type of Facility
Ethanol Plants – 2
Feed Mills - 2
Grain Elevators - 8
1 Fatality
4 injured
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2018 Statistics Purdue University’s Department of Agricultural and Biological Engineering
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Statistics May Be Misleading
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Explosion Pentagon
1. Combustible Dust
2. Dispersion (Suspension)
3. Oxygen
4. Ignition Source
5. Containment/Confinement
Removal of any one of the elements may prevent an explosion or flash fire
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OSHA 1910.272: Immediately remove fugitive grain dust accumulations that
exceed 1/8 inch (0.32 cm) at priority housekeeping areas.
Develop a written housekeeping plan that establishes frequency and methods for removing fugitive grain dust on:
Ledges
Floors
Equipment
Exposed Surfaces
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Housekeeping
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Housekeeping program must address priority areas:
Areas within 35 feet of inside bucket elevators.
“a bucket elevator that has the boot and more than 20 percent of the total leg height (above grade or ground level) inside the grain elevator structure.”
“Bucket elevators with leg casings that are inside (and pass through the roofs) of rail or truck dump sheds with the remainder of the leg outside of the grain elevator structure, are not considered inside bucket elevators.”
Floors of enclosed areas containing grinding equipment
Floors of enclosed areas having grain dryers inside the facility
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Housekeeping
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Captures dust suspended in air at
grain transfer points
Goal: decrease dust concentration
to below the minimum explosive
concentration (MEC)
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Pneumatic Dust Control Systems
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Class II, Division1, Group G
“Open System”
Class II, Division 2, Group G
“Closed System”
Dust Tight
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Proper Electrical Classifications
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Use of Magnet at Receiving
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Two methods to address equipment Concerns:
Documented Preventive Maintenance Programs
Installation of Safety Control Equipment
Dual Approach Most Effective!
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Equipment Concerns
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Outlined in the OSHA Grain Handling Standard
Employer shall implement preventive maintenance procedures
Regularly scheduled inspections of at least the mechanical and safety control equipment associated with:
Grain Stream Processing Equipment
Filter Collectors
Bucket Elevators
Grain Drying Systems
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Preventive Maintenance
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Lubrication schedules and maintenance in accordance with manufacturer recommendations, or as determined by prior operating records
Promptly correct dust collection systems which are malfunctioning or operating below design efficiency
Employer shall promptly correct , or remove from service, overheated bearings, and slipping or misaligned belts associated with inside bucket elevators
Certification record needs to be maintained for each inspection to include: Date of inspection
Name of person inspecting, repairing, etc.
Serial number or other identifier of equipment
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Preventive Maintenance
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Preventive Maintenance
Infrared Thermography - the use of an
infrared imaging and measurement
camera to "see" and "measure" thermal
energy emitted from an object.
Can be used on:
Electrical Systems
Bearings
Motors
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Bearing Monitoring Systems
Conveyor Zero Speeds
Belt Alignment Systems
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Control Equipment
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Approved for the area (Class II, Group
G)
Prescribed preventive maintenance at
regular intervals – Contact installer or
manufacturer
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Preventive Maintenance – Hazard
Monitoring
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Detects grain dust explosion early
Floods area with an extinguishing agent
Can effectively suppress grain dust
explosions in bucket elevator legs and dust
collection equipment
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Explosion Suppression
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Number Three: Falls to Another
Level
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Falls to Another Level
Falls while climbing ladders
Falls from aerial lifts
Falls from work surfaces
Falls from tops of railcars
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Elimination
Passive Systems
Restraint
Personal fall Arrest
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Passive Fall Protection
Best example – Guardrail
Once a guardrail is installed it doesn’t need to
be altered to prevent access to the leading
edge or fall hazard.
Leading edge means the unprotected side and
edge of a floor, roof, or formwork for a floor
or other walking/working surface (such as
deck) which changes location as additional
floor, roof, decking or formwork sections are
placed, formed or constructed.
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Fall Restraint
A tie off system that “restrains” the
employee from falling
Does not allow the worker to access
the fall hazard
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Fall Restraint
Consists of an anchorage point
1,000 lbs.. (ANSI Z359) static
load per person
Body Harness
Connector
Adjustable Restraint Lanyard
Preferred
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Personal Fall Arrest System(PFAS)
Designed to stop a fall once it has already
begun
Bring an employee to a complete stop and
limit deceleration distance:
3.5 feet with a traditional energy absorbing
lanyard
24 inches for Self- Retracting Lifeline
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Basic Pieces of Fall Arrest System
Anchorage/(Anchorage Connector)
Full-Body Harness (Body Wear)
Connector (Connecting Device)
MAKE SURE EMPLOYEES UNDERSTAND CLEARANCE
DISTANCE!
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Horizontal Lifelines
Rigid or Flexible
Attach prior to stepping on to car or climbing
ladder
Tug and walk technique
Retract when not in use (stress on retraction
springs)
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No employee carries an object or
load that could cause the
employee to lose balance or fall
while climbing up or down the
ladder.
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Ladders
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Number Four: Moving Equipment
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Hazard - Struck-By
• According to OSHA, Struck By is defined as an
injury produced by forcible contact or impact
between the injured person, object or piece
of equipment.
• Examples: Involve vehicles including
forklifts, semi-trucks, end-loaders, skid-steer
loaders, etc.
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Hazard - Back-Over
• A back-over incident occurs when
a backing vehicle strikes a worker
who is standing, walking, or
kneeling beside or under a vehicle.
• Generally Caused by:
o Driver not being able to see a
worker in their blind spot
o Workers not hearing back-up
alarms
o Employee retrieving equipment or
tools under vehicles
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Personal Protective Equipment
• Reflective/High Visibility Clothing
o Intended to clearly distinguish the
worker from the environment
o Consists of background material,
retro-reflective bands, and combined
performance material
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Housekeeping/Maintenance
• Effective housekeeping not only
eliminates fugitive dust, but also
can eliminate the potential for
falls on the same level caused by
worker slips or trips.
• Eliminate grain on walking surfaces
• Store equipment such as brooms
and shovels on designated areas in
the immediate area
o Five S Approach - shadow board
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Preventing Back-Over/Struck-By
Incidents
• Develop internal traffic control
Plans
• Plans should coordinate the flow of
moving equipment, workers and
vehicles to eliminate vehicles and
employees from crossing paths
• Establish work zones (storage piles,
bunkers, storage structures, etc.)
From NGFA Safety Tips – Vehicle
Struck-By
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Preventing Back-Over/Struck-By
Incidents
• Eliminate cell-phone usage in
traffic areas, work zones, and
receiving areas
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Preventing Back-Over Incidents
• Use a spotter when backing up in the work area
• Equip vehicles with in-vehicle display monitors
• Ensure back-up warning devices are operational
• Define work zones using signage, traffic cones, etc.
• Establish work zones for vehicles (trucks, loaders, forklifts, etc.)
• Require communication between workers entering work zones and
the driver (radios, hand signals, etc.)
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Preventing
Back-Over
Incidents Train Employees on the blind
spots behind and around vehicles.
Put Workers in the driver seat to
experience what they can see
and what they can’t
Review blind spot diagrams
provided by NIOSH
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Preventing Struck-By Incidents
• Define pedestrian walkways and
vehicle traffic areas
o Barriers
o Signage
o Striping
• Post signage at doorways that enter
into traffic/vehicle areas
• Stay in designated walkways and
wear high visibility clothing
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Safe Practices
• Establish the “red zone.” The red zone is any area within arm’s length of the vehicle. Communicate with the driver prior to stepping into the red zone (neutral/Parking Brake, etc.).
• Communicate with the driver prior to crossing in front-of, in between, behind vehicles (verbal or visual). Follow company requirements for crossing in-between.
• Never cross under trailer
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Safe Practices
• When directing vehicle movement stay in a
position visible to the driver
• Ensure that a designated person directs
movement
• Remember: if you cannot see the driver in the
mirror, he or she cannot see you. Maintain
constant communication with the driver
• Keep persons not involved in the receiving
process out of the area
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Number Five: Dangerous Equipment
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Lockout Tagout
Lockout Tagout during Servicing or Maintenance Activities.
To learn more meet me in the Sagewood/Breezewood room at 3:00.
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Machine Guarding – Inward Running
Point/Rotating Shaft
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Machine Guarding – Inward Running Point
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Machine Guarding – Rotating Shaft
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Machine Guarding – Rotating Shaft
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Machine Guarding Example
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What Can I Do to Prevent Serious
Injuries and Fatalities (SIFS)
Small Focus Groups “What can kill or severely injure you at work?
Identify top 5-10
Use Hierarchy of Controls to address hazards
Implement Near Miss program
Implement JHA/JSA Process
Commit to Safety at all costs, even when we don’t have time.
Repetition, repetition, repetition!
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Questions
Joe Mlynek CSP, OHST
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