12 Aug Grinding / Hot Work – JSA

Grinding / Hot Work Job Safety Analysis (JSA)

Job / Task

Portable and stationary grinding activities that generate sparks, heat, or hot metal, including surface preparation, weld grinding, cutting or dressing metal, deburring, sharpening, and related abrasive-wheel work.

Purpose

This Job Safety Analysis (JSA), also known as a Job Hazard Analysis (JHA), identifies hazards associated with grinding and other spark-producing hot work and establishes safe work practices and controls to prevent wheel failure, cuts, burns, eye and face injuries, fires, explosions, electrical shock, noise exposure, and exposure to dusts, fumes, and flying particles.

Personnel Qualifications

Grinding and spark-producing hot work shall be performed only by trained and authorized employees who understand abrasive-wheel hazards, tool inspection, guarding, PPE, fire prevention, hot-work requirements, and safe operating practices.

Employees shall:

• Use grinders and abrasive wheels only for their intended purpose and within manufacturer limitations.
• Inspect grinders, guards, handles, cords, plugs, batteries, switches, flanges, and abrasive wheels before use.
• Verify the wheel type, size, and maximum operating speed are compatible with the grinder.
• Obtain a hot-work permit when required by the site or hot-work program.
• Remove or protect combustible and flammable materials from sparks and hot particles.
• Use required eye, face, hearing, respiratory, and hand protection.
• Secure workpieces and maintain control of the grinder with proper body positioning.
• Stop work when guards, wheels, fire controls, ventilation, or other safety measures are inadequate.

Required PPE

PPE shall be selected based on the grinder, wheel, material, sparks, dust, noise, and work environment and may include:

• Safety glasses with side protection.
• Face shield worn over safety glasses or goggles for protection from flying particles and wheel fragments.
• Work gloves appropriate for handling sharp or hot materials, provided they do not create an entanglement hazard.
• Flame-resistant clothing where sparks or hot particles present a burn or ignition hazard.
• Safety footwear appropriate for falling objects, sparks, and hot metal.
• Hearing protection where required by the noise exposure.
• Respiratory protection when required by the respiratory hazard assessment and respiratory-protection program.
• Hard hat where overhead or construction hazards exist.
• Additional task-specific PPE identified by the hazard assessment.

Loose clothing, jewelry, unsecured long hair, and other items that could become caught in rotating equipment shall be secured or removed before grinding.

JSA – Job Steps, Hazards, and Controls

Step 1 – Review the Grinding Task

Potential Hazards

• Wrong grinder or wheel.
• Hazardous material exposure.
• Fire or explosion.
• Excessive sparks or dust.

Required Controls

• Identify the material, required grinding operation, grinder type, wheel type, and work location.
• Review manufacturer instructions and applicable SDS information.
• Determine whether the work is considered hot work and whether a permit is required.
• Identify coatings, residues, or metals that could generate hazardous dust or fumes.
• Determine ventilation, respiratory protection, fire prevention, and PPE requirements before beginning.

Step 2 – Inspect the Work Area

Potential Hazards

• Combustible materials.
• Flammable vapors.
• Nearby personnel exposure.
• Poor housekeeping.

Required Controls

• Inspect the work area and adjacent spaces for combustible materials, flammable liquids, gases, dusts, and other ignition hazards.
• Remove combustibles where practical or protect them with suitable fire-resistant barriers or covers.
• Check openings, floor penetrations, lower levels, and concealed spaces where sparks could travel.
• Keep the area clear of unnecessary personnel and materials.
• Do not grind where a flammable or explosive atmosphere may exist unless specifically controlled and authorized.

Step 3 – Obtain Hot-Work Authorization

Potential Hazards

• Uncontrolled ignition source.
• Inadequate fire protection.
• Work in a prohibited area.

Required Controls

• Obtain a hot-work permit when required.
• Verify required fire-prevention measures are in place before grinding begins.
• Ensure suitable fire-extinguishing equipment is readily available.
• Assign a trained fire watch when required by the hot-work program or site conditions.
• Suspend work if permit conditions or required controls cannot be maintained.

Step 4 – Inspect the Grinder

Potential Hazards

• Electrical shock.
• Unexpected startup.
• Missing guard.
• Damaged tool.

Required Controls

• Inspect the grinder body, switch, guard, auxiliary handle, cord and plug, battery, and other components before use.
• Verify guards and handles are installed and secure as designed.
• Remove damaged or malfunctioning grinders from service.
• Do not bypass switches, guards, or safety devices.
• Disconnect the power source or remove the battery before changing wheels or making adjustments.

Step 5 – Inspect and Select the Abrasive Wheel

Potential Hazards

• Wheel rupture.
• Incorrect wheel type.
• Overspeed.
• Cracked or damaged wheel.

Required Controls

• Use only wheels designed for the grinder and intended operation.
• Verify the wheel’s maximum rated speed is equal to or greater than the grinder’s maximum operating speed.
• Inspect wheels for cracks, chips, contamination, excessive wear, or other damage before mounting.
• Perform a ring test on applicable vitrified bonded wheels before mounting when required.
• Do not use a wheel that has been dropped, damaged, altered, or improperly stored.

Step 6 – Mount the Wheel

Potential Hazards

• Wheel failure.
• Improper flange contact.
• Unexpected startup.
• Pinch injury.

Required Controls

• Disconnect or isolate the grinder from its energy source before mounting the wheel.
• Use the correct flanges, blotters, adapters, and mounting hardware specified by the manufacturer.
• Do not force a wheel onto the spindle or alter the mounting hole.
• Tighten mounting hardware only as required by the manufacturer.
• Reinstall and properly position the guard before operating the grinder.

Step 7 – Secure and Position the Workpiece

Potential Hazards

• Workpiece movement.
• Pinch points.
• Kickback.
• Struck-by injury.

Required Controls

• Secure small or movable workpieces with clamps, vises, fixtures, or other suitable means.
• Position the work so sparks and debris are directed away from employees, cylinders, hoses, cords, combustibles, and occupied areas.
• Maintain stable footing and adequate working space.
• Do not hold small workpieces by hand when loss of control is reasonably foreseeable.
• Plan the grinding direction before starting the tool.

Step 8 – Start the Grinder

Potential Hazards

• Wheel rupture.
• Unexpected movement.
• Loss of control.

Required Controls

• Hold portable grinders firmly with both hands when designed for two-handed operation.
• Keep the wheel clear of the workpiece during startup.
• Stand out of the plane of the wheel when practical during initial startup.
• Allow the grinder to reach operating speed and observe for unusual vibration, noise, or wobble.
• Stop immediately if the grinder or wheel does not operate normally.

Step 9 – Perform Grinding

Potential Hazards

• Flying particles.
• Wheel failure.
• Kickback.
• Cuts and burns.
• Sparks.

Required Controls

• Maintain required eye and face protection throughout grinding.
• Use the portion of the wheel intended for the operation and maintain the proper working angle.
• Apply controlled pressure; do not force, jam, twist, or bind the wheel.
• Keep hands and body out of the wheel’s path.
• Maintain firm control until the wheel stops completely.
• Direct sparks and debris into a controlled area away from people and ignition hazards.

Step 10 – Control Sparks and Hot Particles

Potential Hazards

• Fire.
• Burns.
• Damage to nearby equipment.
• Ignition of concealed combustibles.

Required Controls

• Use spark screens, welding blankets, curtains, or other fire-resistant barriers where appropriate.
• Protect nearby equipment, finishes, hoses, cords, cylinders, and combustible surfaces.
• Monitor where sparks land, including lower levels and opposite sides of partitions.
• Do not direct sparks toward flammable or combustible materials.
• Stop work immediately if ignition, smoldering, or uncontrolled spark travel occurs.

Step 11 – Grind Painted, Coated, or Contaminated Material

Potential Hazards

• Hazardous dust.
• Toxic fumes.
• Lead, chromium, or other metal exposure.

Required Controls

• Identify coatings and contaminants before grinding.
• Use local exhaust, dust collection, or other engineering controls where appropriate.
• Follow applicable controls for lead, chromium, silica, or other hazardous substances.
• Use respiratory protection when required by the exposure assessment and respiratory-protection program.
• Stop work if unknown coatings, unusual dust, odors, or symptoms are encountered.

Step 12 – Control Dust and Ventilation

Potential Hazards

• Respiratory exposure.
• Reduced visibility.
• Combustible dust accumulation.

Required Controls

• Use ventilation or dust collection suitable for the material and operation.
• Avoid directing airborne dust toward other employees or occupied areas.
• Do not use compressed air to create uncontrolled airborne dust.
• Prevent accumulation of combustible metal dusts and follow special procedures where such dusts may be present.
• Maintain housekeeping throughout the task.

Step 13 – Use Electric Grinders in Damp or Outdoor Areas

Potential Hazards

• Electric shock.
• Ground fault.
• Damaged cords.

Required Controls

• Keep electrical grinders, cords, plugs, and connections dry and protected.
• Use GFCI protection where required.
• Inspect extension cords and power supplies before use.
• Do not handle electrical connections with wet hands or while standing in water.
• Stop work when wet conditions create an uncontrolled electrical hazard.

Step 14 – Use Battery-Powered Grinders

Potential Hazards

• Battery damage.
• Thermal event.
• Unexpected startup.

Required Controls

• Inspect batteries and chargers for damage before use.
• Use only manufacturer-approved batteries and chargers.
• Remove the battery before changing wheels, clearing jams, or making adjustments when required.
• Protect batteries from sparks, heat, impact, and conductive debris.
• Remove damaged, swollen, overheated, or malfunctioning batteries from service.

Step 15 – Change or Adjust the Wheel

Potential Hazards

• Unexpected startup.
• Cuts.
• Hot wheel or workpiece.

Required Controls

• Disconnect the grinder from power or remove the battery before adjustment or wheel changes.
• Allow the wheel and workpiece to cool when necessary.
• Use the correct tool for removing and installing the wheel.
• Inspect replacement wheels before installation.
• Verify the guard is correctly positioned before returning the grinder to service.

Step 16 – Complete Grinding and Shut Down

Potential Hazards

• Contact with rotating wheel.
• Hot material.
• Tool movement after release.

Required Controls

• Remove the wheel from the workpiece before switching the grinder off when appropriate.
• Maintain control until the wheel has stopped completely.
• Do not set a portable grinder down while the wheel is rotating.
• Disconnect or isolate the tool before cleaning, inspection, or storage.
• Treat recently ground metal and sparks as hot until verified otherwise.

Step 17 – Complete Fire Watch and Cleanup

Potential Hazards

• Delayed fire.
• Smoldering debris.
• Sharp scrap.
• Hot particles in waste.

Required Controls

• Maintain the fire watch for the period required by the hot-work program and site conditions.
• Inspect adjacent areas, lower levels, concealed spaces, and opposite sides of partitions for heat or smoldering material.
• Collect grinding debris, metal fragments, used wheels, and combustible waste safely.
• Do not place hot metal or sparks in combustible waste containers.
• Report fires, near misses, damaged equipment, wheel failures, and unusual exposures.

General Safe Work Requirements

• Grinding shall be performed only by trained and authorized employees using equipment suitable for the task.
• A hot-work permit shall be obtained whenever required by the applicable hot-work program or site requirements.
• Grinding wheels shall be compatible with the grinder and rated at or above the grinder’s maximum operating speed.
• Required guards and auxiliary handles shall remain installed and properly positioned.
• Damaged, cracked, excessively worn, or questionable abrasive wheels shall not be used.
• The grinder shall be disconnected from its energy source before wheel changes, adjustments, or maintenance.
• Suitable eye and face protection shall be worn during grinding.
• Combustible and flammable materials shall be removed, isolated, or protected from sparks and hot particles.
• Adequate ventilation, dust collection, or respiratory protection shall be provided when hazardous dusts or fumes may be generated.
• A fire watch and suitable fire-extinguishing equipment shall be provided when required.
• Work shall stop whenever wheel condition, guarding, fire controls, ventilation, electrical conditions, or other hazards cannot be adequately controlled.

Training

Employees performing grinding and spark-producing hot work shall receive training appropriate to the equipment and materials used. Training shall include grinder and wheel selection, abrasive-wheel inspection, ring testing where applicable, guarding, wheel mounting, safe operating angles, kickback prevention, PPE, hot-work permits, fire prevention and fire-watch duties, spark control, electrical safety, hazardous dust and coating exposure, ventilation, emergency response, and stop-work expectations.

References

• OSHA 29 CFR 1926.300 – General Requirements for Tools.
• OSHA 29 CFR 1926.303 – Abrasive Wheels and Tools.
• OSHA 29 CFR 1926.352 – Fire Prevention.
• OSHA 29 CFR 1910.215 – Abrasive Wheel Machinery, where applicable.
• OSHA 29 CFR 1910 Subpart P – Hand and Portable Powered Tools and Other Hand-Held Equipment, where applicable.
• OSHA 29 CFR 1910.134 – Respiratory Protection, where applicable.
• Applicable SDSs, manufacturer instructions, hot-work procedures, and site requirements.