personal protective equipment and tool safety
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Personal Protective Equipment and Tool Safety. Joe Nail. Introduction to PPE. - PowerPoint PPT PresentationTRANSCRIPT
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04/21/2304/21/23 Industrial Safety Lecture TwoIndustrial Safety Lecture Two 11
Personal Protective Personal Protective Equipment and Tool Equipment and Tool
SafetySafetyJoe NailJoe Nail
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04/21/2304/21/23 Industrial Safety Lecture TwoIndustrial Safety Lecture Two 22
Introduction to PPEIntroduction to PPEEmployees must be protected from harm. Common methods for doing this are Engineering Controls, Work Practices, Administrative Controls and, Personal Protective Equipment (PPE). Sometimes one or more of the above is used and at times all are used to provide adequate protection. When only PPE is used, the PPE is the only thing protecting the employee from the danger. This unit discusses basic types of PPE and the employer requirements.
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What is personal protectiveWhat is personal protectiveequipment?equipment?
Personal protective equipment, or PPE, isPersonal protective equipment, or PPE, is
designed to protect employees from serious designed to protect employees from serious workplace injuries or illnesses resulting from workplace injuries or illnesses resulting from contact with chemical, radiological, physical, contact with chemical, radiological, physical, electrical, mechanical, or other workplace hazards. electrical, mechanical, or other workplace hazards. Besides face shields, safety glasses, hard hats, and Besides face shields, safety glasses, hard hats, and safety shoes, PPE includes asafety shoes, PPE includes a
variety of devices and garments such as goggles, variety of devices and garments such as goggles, coveralls, gloves, vests, earplugs, and respirators.coveralls, gloves, vests, earplugs, and respirators.
04/21/2304/21/23 Industrial Safety Lecture TwoIndustrial Safety Lecture Two
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Employer’s ResponsibilitiesEmployer’s Responsibilities(OSHA Subpart I:1910.132-140)(OSHA Subpart I:1910.132-140)
What Kind of PPE Approved PPEWhat Kind of PPE Approved PPEMaintained PPE Training to use PPEMaintained PPE Training to use PPE
04/21/2304/21/23 Industrial Safety Lecture TwoIndustrial Safety Lecture Two 44
OSHA’s primary PPE standards are in Title 29 of the Code of Federal OSHA’s primary PPE standards are in Title 29 of the Code of Federal Regulations (CFR), Part 1910 Subpart I, and equivalent regulations in states Regulations (CFR), Part 1910 Subpart I, and equivalent regulations in states with OSHA-approved state plans, but you can find PPE requirements with OSHA-approved state plans, but you can find PPE requirements elsewhere in the General Industry Standards. For example, 29 CFR 1910.156, elsewhere in the General Industry Standards. For example, 29 CFR 1910.156, OSHA’s Fire Brigades Standard, has requirements for firefighting gear. In OSHA’s Fire Brigades Standard, has requirements for firefighting gear. In addition, 29 CFR 1926.95-106 covers the construction industry. OSHA’s addition, 29 CFR 1926.95-106 covers the construction industry. OSHA’s general PPE requirements mandate that employers conduct a hazard general PPE requirements mandate that employers conduct a hazard assessment of their workplaces to determine what hazards are present that assessment of their workplaces to determine what hazards are present that require the use of PPE, provide workers with appropriate PPE, and require require the use of PPE, provide workers with appropriate PPE, and require them to use and maintain it in sanitary and reliable condition. As an employer, them to use and maintain it in sanitary and reliable condition. As an employer, you must assess your workplace to determine if hazards are presentyou must assess your workplace to determine if hazards are presentthat require the use of PPE. that require the use of PPE.
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1910.132(d) Hazard Assessment1910.132(d) Hazard Assessment
(2)The employer shall verify that the required workplace (2)The employer shall verify that the required workplace
hazard assessment has been performed through a written hazard assessment has been performed through a written
certification that identifies: certification that identifies:
The workplace evaluated; The workplace evaluated;
The person certifying that the evaluation has been The person certifying that the evaluation has been
performed; performed;
The date(s) of the hazard assessment; and, The date(s) of the hazard assessment; and,
Which identifies the document as a certification of hazard Which identifies the document as a certification of hazard
assessmentassessment
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New Employee OrientationNew Employee Orientation
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Employer’s ResponsibilitiesEmployer’s Responsibilities
If such hazards are present, you must select PPE and require employees to If such hazards are present, you must select PPE and require employees to use it, communicate your PPE selection decisions to your employees, and use it, communicate your PPE selection decisions to your employees, and select PPE that properly fits your workers. You must also train employees select PPE that properly fits your workers. You must also train employees who are required to wear PPE on how do the following:who are required to wear PPE on how do the following:
Use PPE properly,Use PPE properly, Be aware of when PPE is necessary,Be aware of when PPE is necessary, Know what kind of PPE is necessary,Know what kind of PPE is necessary, Understand the limitations of PPE inUnderstand the limitations of PPE in protecting employees from injury,protecting employees from injury, Don, adjust, wear, and care for PPE, andDon, adjust, wear, and care for PPE, and Maintain PPE properly.Maintain PPE properly.
04/21/2304/21/23 Industrial Safety Lecture TwoIndustrial Safety Lecture Two 77
1910.132(f) Training1910.132(f) Training
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04/21/2304/21/23 Industrial Safety Lecture TwoIndustrial Safety Lecture Two 88
Employee’s ResponsibilitiesEmployee’s Responsibilities Inspect Maintain Report DefectsInspect Maintain Report Defects
Employees should look at their equipment on a daily basis to make sure it is good working order. This is the responsibility of each employee.
PPE, especially eye wear and face masks, should be cleaned daily by the person who wears it.
The employee must reports any problems with PPE, as well as other protective equipment, as soon as it is detected.
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1910.132(f) Training1910.132(f) Training (2)Workers must (2)Workers must demonstrate an understandingdemonstrate an understanding of the of the
training and the ability to use PPE properly, training and the ability to use PPE properly, beforebefore being being
allowed to perform work requiring the use of PPE:allowed to perform work requiring the use of PPE: (4)Verify that each employee has received and understood the (4)Verify that each employee has received and understood the
required training through a written certification that contains: required training through a written certification that contains: The name of each employee trained, The name of each employee trained,
The date(s) of training, and that The date(s) of training, and that
Identifies the subject of the certificationIdentifies the subject of the certification
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1910.138(a) General requirements1910.138(a) General requirements Employers shall select and require employees Employers shall select and require employees
to use appropriate hand protection when to use appropriate hand protection when employees' hands are exposed to hazards such employees' hands are exposed to hazards such as those from: as those from: Skin absorption of harmful substances; Skin absorption of harmful substances;
Severe cuts or lacerations; Severe cuts or lacerations;
Severe abrasions; Severe abrasions;
Punctures; Punctures;
Chemical burns; Chemical burns;
Thermal burns; and Thermal burns; and
Harmful temperature extremesHarmful temperature extremes
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04/21/2304/21/23 Industrial Safety Lecture TwoIndustrial Safety Lecture Two 1111
Introduction to PPEIntroduction to PPE Hand Protection Hand Protection
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04/21/2304/21/23 Industrial Safety Lecture TwoIndustrial Safety Lecture Two 1212
Introduction to PPEIntroduction to PPE
Head Head ProtectionProtection
Webbing: 1 inch clearance
Early Hard Hats were made of metal
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1910.135(a) General requirements1910.135(a) General requirements
(1)Ensure that each employee (1)Ensure that each employee
wears a protective helmet wears a protective helmet
when working in areas where when working in areas where
there is a potential for injury to there is a potential for injury to
the head from falling objectsthe head from falling objects
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Classes and types of Hard hatsClasses and types of Hard hats
Type I hard hats - Type I hard hats - intended to intended to
reduce the force of impact resulting reduce the force of impact resulting
from a blow to the top of the headfrom a blow to the top of the head
Type II hard hats - Type II hard hats - designed to designed to
provide protection against both provide protection against both
side impact (lateral) side impact (lateral) andand blows to blows to
the top of the headthe top of the head
ClassesClasses G (old A)G (old A) GeneralGeneral
2,200 volts2,200 volts
E (old B)E (old B) ElectricalElectrical
20,000 volts20,000 volts
C (same)C (same) ConductiveConductive
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1910.135(b) Criteria for protective 1910.135(b) Criteria for protective helmetshelmets
(1)Protective (1)Protective
helmets purchased helmets purchased
after July 5, 1994 after July 5, 1994
shall comply with shall comply with
ANSI Z89.1-1986ANSI Z89.1-1986
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04/21/2304/21/23 Industrial Safety Lecture TwoIndustrial Safety Lecture Two 1616
Introduction to PPEIntroduction to PPE Care of a Hard HatCare of a Hard Hat
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04/21/2304/21/23 Industrial Safety Lecture TwoIndustrial Safety Lecture Two 1717
Introduction to PPEIntroduction to PPE
Eye ProtectionEye Protection GlassesGlasses
GogglesGoggles
Z 87.1-1989
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04/21/2304/21/23 Industrial Safety Lecture TwoIndustrial Safety Lecture Two 1818
Introduction to PPEIntroduction to PPE
Face ProtectionFace Protection
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04/21/2304/21/23 Industrial Safety Lecture TwoIndustrial Safety Lecture Two 1919
PPE 1910.95PPE 1910.95Protection against the effects of noise exposure shall be Protection against the effects of noise exposure shall be provided when the sound levels exceed those shown in provided when the sound levels exceed those shown in
Table G-16.Table G-16.
Hearing Protection: Reusable and DisposableHearing Protection: Reusable and Disposable
Ear MuffsReusable Ear Plugs
Ear Protection and Communication
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Table G-16Table G-16
Exposure Hours per Day Sound Level in dBA
8 90
6 92
4 95
3 97
2 100
1 1/2 102
1 105
1/2 110
¼ or less 115
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Ensure that each affected Ensure that each affected
employee uses protective employee uses protective
footwear when working footwear when working
in areas where there is: in areas where there is:
A danger of foot injuries due to A danger of foot injuries due to
falling or rolling objects, or falling or rolling objects, or
Objects piercing the sole, and Objects piercing the sole, and
Where such employee's feet are Where such employee's feet are
exposed to electrical hazardsexposed to electrical hazards
1910.136(a) General requirements1910.136(a) General requirements
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04/21/2304/21/23 Industrial Safety Lecture TwoIndustrial Safety Lecture Two 2222
Introduction to PPEIntroduction to PPE Foot ProtectionFoot Protection
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1910.136(b) Criteria for protective footwear1910.136(b) Criteria for protective footwear
(1)Protective footwear purchased after July 5, (1)Protective footwear purchased after July 5,
1994 shall comply with ANSI Z41-1991, 1994 shall comply with ANSI Z41-1991,
"American National Standard for Personal "American National Standard for Personal
Protection-Protective Footwear,"Protection-Protective Footwear,"
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04/21/2304/21/23 Industrial Safety Lecture TwoIndustrial Safety Lecture Two 2424
Introduction to PPEIntroduction to PPE Foot Protection(continued)Foot Protection(continued)
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Introduction to PPEIntroduction to PPE Foot Protection(continued)Foot Protection(continued)
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04/21/2304/21/23 Industrial Safety Lecture TwoIndustrial Safety Lecture Two 2626
Safety HarnessSafety Harness
Limits a fall to only a feetLimits a fall to only a feet
Must be supplied by employerMust be supplied by employer
Employee MUST be trained on how to useEmployee MUST be trained on how to use
Requires a written programRequires a written program
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04/21/2304/21/23 Industrial Safety Lecture TwoIndustrial Safety Lecture Two 2727
Introduction to PPEIntroduction to PPE
Respiratory ProtectionRespiratory Protection
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04/21/2304/21/23 Industrial Safety Lecture TwoIndustrial Safety Lecture Two 2828
Respiratory ProtectionRespiratory Protection
Filter RespiratorsFilter Respirators Air-Purifying-particles and gasesAir-Purifying-particles and gases Particulate-dusts and mistsParticulate-dusts and mists
Atmosphere-Supplying-RespiratorsAtmosphere-Supplying-Respirators
Supplied AirSupplied Air
Self ContainedSelf Contained
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1910.134(c)(1) Respiratory 1910.134(c)(1) Respiratory protection programprotection program
Where respirators are required you need:Where respirators are required you need: Written programWritten program
Worksite-specific proceduresWorksite-specific procedures
Required elements:Required elements: TrainingTraining
Fit testingFit testing
Medical evaluationsMedical evaluations
Care and maintenanceCare and maintenance
Procedures for respirator selectionProcedures for respirator selection
Procedures for routine & emergency useProcedures for routine & emergency use
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1910.134(c)(2) Where respirator use is not 1910.134(c)(2) Where respirator use is not required:required:
(i)If voluntary respirator use is permissible, provide the (i)If voluntary respirator use is permissible, provide the respirator users with the information contained in respirator users with the information contained in Appendix D and,Appendix D and,
(ii)Establish and implement those elements of a written (ii)Establish and implement those elements of a written respiratory protection program* necessary to ensure respiratory protection program* necessary to ensure that any employee using a respirator voluntarily is that any employee using a respirator voluntarily is medically able to use that respiratormedically able to use that respirator
(ii)That the respirator is cleaned, stored, and maintained (ii)That the respirator is cleaned, stored, and maintained so that its use does not present a health hazard to the so that its use does not present a health hazard to the useruser
*Written program not required for voluntary use of dust masks*Written program not required for voluntary use of dust masks
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04/21/2304/21/23 Industrial Safety Lecture TwoIndustrial Safety Lecture Two 3131
Introduction to PPEIntroduction to PPE Atmosphere Supplying Atmosphere Supplying
RespiratorsRespirators
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04/21/2304/21/23 Industrial Safety Lecture TwoIndustrial Safety Lecture Two 3232
SCBASCBA
Self Contained Breathing ApparatusSelf Contained Breathing Apparatus
Used in Low Oxygen Environments like Used in Low Oxygen Environments like Confined Spaces as defined by OSHAConfined Spaces as defined by OSHA
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04/21/2304/21/23 Industrial Safety Lecture TwoIndustrial Safety Lecture Two 3333
Part Two-Hand ToolsPart Two-Hand Tools
Defective ToolsDefective Tools Wrong Tool for the JobWrong Tool for the Job Improperly Maintained ToolImproperly Maintained Tool Tool in the Wrong PlaceTool in the Wrong Place Incorrect Body PositioningIncorrect Body Positioning
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Hand ToolsHand Tools
Defective ToolsDefective Tools
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04/21/2304/21/23 Industrial Safety Lecture TwoIndustrial Safety Lecture Two 3535
Hand ToolsHand Tools
Wrong Tool for the JobWrong Tool for the Job
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Hand ToolsHand Tools
Incorrect UseIncorrect Use
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04/21/2304/21/23 Industrial Safety Lecture TwoIndustrial Safety Lecture Two 3737
Hand ToolsHand Tools
Wrong Place (storage practices)Wrong Place (storage practices) Wrong Body PositioningWrong Body Positioning
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04/21/2304/21/23 Industrial Safety Lecture TwoIndustrial Safety Lecture Two 3838
Hand ToolsHand Tools
ScrewdriversScrewdrivers
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04/21/2304/21/23 Industrial Safety Lecture TwoIndustrial Safety Lecture Two 3939
Hand ToolsHand Tools
WrenchesWrenches
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Hand ToolsHand Tools
PliersPliers
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04/21/2304/21/23 Industrial Safety Lecture TwoIndustrial Safety Lecture Two 4141
Hand ToolsHand Tools
Hammers and MalletsHammers and Mallets
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04/21/2304/21/23 Industrial Safety Lecture TwoIndustrial Safety Lecture Two 4242
Hand ToolsHand Tools
Chisels and PunchesChisels and Punches
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04/21/2304/21/23 Industrial Safety Lecture TwoIndustrial Safety Lecture Two 4343
Hand ToolsHand Tools
KnivesKnives
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Hand ToolsHand Tools
Electric Tools and Electrical SafetyElectric Tools and Electrical Safety
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04/21/2304/21/23 Industrial Safety Lecture TwoIndustrial Safety Lecture Two 4545
Hand ToolsHand Tools
Pneumatic ToolsPneumatic Tools
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04/21/2304/21/23 Industrial Safety Lecture TwoIndustrial Safety Lecture Two 4646
Hand ToolsHand Tools
Gasoline Powered Tools and Gasoline Powered Tools and EquipmentEquipment
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General Safety PrecautionsGeneral Safety Precautions
Keep all tools in good condition Keep all tools in good condition with regular maintenancewith regular maintenance
Use the right tool for the right jobUse the right tool for the right job
Inspect each tool for damage Inspect each tool for damage before use before use
Operate according to the Operate according to the manufacturer’s instructionsmanufacturer’s instructions
Provide and use proper personal Provide and use proper personal protective equipmentprotective equipment
4747
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General Safety Precautions General Safety Precautions
Responsibility of the Responsibility of the employeremployer
PPE provision and monitoringPPE provision and monitoring
Safe work proceduresSafe work procedures
Safe condition of tools including Safe condition of tools including personal toolspersonal tools
4848
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Hand ToolsHand Tools
Non poweredNon powered
Largest hazardLargest hazard
MisuseMisuse
Improper maintenanceImproper maintenance
Safe useSafe use
Direction of knives and bladesDirection of knives and blades
Sharp knives and bladesSharp knives and blades
Safe working surfacesSafe working surfaces
4949
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Power ToolsPower Tools
Classification by power sourceClassification by power source
ElectricElectric
PneumaticPneumatic
Liquid FuelLiquid Fuel
HydraulicHydraulic
Powder ActuatedPowder Actuated
5050
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Power Tools (cont.)Power Tools (cont.)
1926.304(d)1926.304(d)
Upper blade guardUpper blade guard
Lower blade guardLower blade guard
Automatically returns to Automatically returns to starting positionstarting position
5151
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Power Tools (cont.)Power Tools (cont.)
1926.300(d)(2)1926.300(d)(2)
Equipped with a momentary Equipped with a momentary contact “on-off” control and contact “on-off” control and may have a lock-on control may have a lock-on control provided.provided.
However, that turnoff must be However, that turnoff must be accomplished by a single accomplished by a single motion of the same finger or motion of the same finger or fingers that turn it on.fingers that turn it on.
5252
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Power Tools (cont.)Power Tools (cont.)
Momentary Contact “on/off” switchMomentary Contact “on/off” switch
DrillsDrills
TappersTappers
FastenersFasteners
Drivers Drivers
Grinders – Greater than 2” in dia.Grinders – Greater than 2” in dia.
Disc and Belt SandersDisc and Belt Sanders
Reciprocating SawsReciprocating Saws
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Power Tools (cont.)Power Tools (cont.)
Positive “on/off” controlsPositive “on/off” controls
Disc Sanders – w/ discs 2” in dia. Or lessDisc Sanders – w/ discs 2” in dia. Or less
Routers Routers
TrimmersTrimmers
ShearsShears
Jig Saws – w/ blade ¼” wide or lessJig Saws – w/ blade ¼” wide or less
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Power Tools (cont.)Power Tools (cont.)
ON POSITION OFF POSITION
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Power Tools (cont.)Power Tools (cont.)
Never carry tools by cordsNever carry tools by cords
Never pull cords to disconnectNever pull cords to disconnect
Disconnect tools when not in use Disconnect tools when not in use or during maintenanceor during maintenance
Secure work with vice or clampSecure work with vice or clamp Allows two hands for workingAllows two hands for working
Follow users manual instructionsFollow users manual instructions
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Power Tools (cont.)Power Tools (cont.)
Proper apparel Proper apparel NONO loose clothing, hair, or jewelry loose clothing, hair, or jewelry
Tag all damaged tools “Out of Service” or discard themTag all damaged tools “Out of Service” or discard them
Keep blades and knives sharpenedKeep blades and knives sharpened
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Electric Tools (cont.)Electric Tools (cont.)
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Electric Tools (cont.)Electric Tools (cont.)
Double-Insulated Marking
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Powered Abrasive WheelsPowered Abrasive Wheels
Flying fragmentsFlying fragments
Wear proper PPEWear proper PPE
Ring test – 1926.303(c)(7)Ring test – 1926.303(c)(7)
MountingMounting
Follow manufacturer’s instructionsFollow manufacturer’s instructions
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Abrasive Wheels (cont.)Abrasive Wheels (cont.)
Maximum RPM
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Abrasive Wheels (cont.)Abrasive Wheels (cont.)
180 deg
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Powder Actuated ToolsPowder Actuated Tools 1926.302(e)1926.302(e)
Meet ANSI A10.3 – 1970Meet ANSI A10.3 – 1970
PPEPPE
Eye ProtectionEye Protection
Head and face depending on conditionsHead and face depending on conditions
Proper training requiredProper training required
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Powder Actuated Tools (cont.)Powder Actuated Tools (cont.)
1926.302(e)1926.302(e)
Fasteners used in tool Fasteners used in tool specifically designed specifically designed for that toolfor that tool
Designed for the Designed for the material that is being material that is being driven intodriven into
Concrete
Concrete/wood
Wood
Specific size = Specific operation
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Charges used in powder actuated tools
Right size charge with right size fastener
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Powder Actuated Tools (cont.)Powder Actuated Tools (cont.)
Tools must be inspected before useTools must be inspected before use
Defective tools taken out of service immediatelyDefective tools taken out of service immediately
Tools not loaded until just before intended firingTools not loaded until just before intended firing
Loaded or empty tools are never to be pointed at anyoneLoaded or empty tools are never to be pointed at anyone
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Powder Actuated Tools (cont.)Powder Actuated Tools (cont.) 1926.302(e)(7) 1926.302(e)(7) Fasteners not driven into:Fasteners not driven into:
Very hard or brittle materialsVery hard or brittle materials
Cast ironCast iron
Glazed tileGlazed tile
Surface-hardened steelSurface-hardened steel
Glass blockGlass block
Live rockLive rock
Face brickFace brick
Hollow tileHollow tile
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Powder Actuated Tools (cont)Powder Actuated Tools (cont) Inspection:Inspection:
Make sure it’s cleanMake sure it’s clean
All parts must operate freelyAll parts must operate freely
The barrel is free from obstructionsThe barrel is free from obstructions
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Powder Actuated Tools (cont)Powder Actuated Tools (cont) FiringFiring
Keep hands clear of the barrelKeep hands clear of the barrel
5 pounds of force against working material5 pounds of force against working material
MisfiresMisfires Wait 30 secondsWait 30 seconds
Try firing againTry firing again
Wait another 30 sec.Wait another 30 sec.
Remove the cartridge Remove the cartridge
Place in waterPlace in water
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Powder Actuated Tools (cont)Powder Actuated Tools (cont) DefectsDefects
Tag “do not operate”Tag “do not operate”
Remove from serviceRemove from service
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“FATAL FACT”
Employee killed when struck in head by a nail fired from a powder actuated tool. Tool operator was attempting to anchor a plywood form
in preparation for pouring a concrete wall.
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“FATAL FACT”
Employees performing remodeling operations building a wall. Operator was attempting to anchor plywood to a 2”x 4” stud. The nail penetrated the stud and struck the victim. One worker killed
when struck by a nail from a powder-actuated tool.
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Pneumatic ToolsPneumatic Tools
Appropriate PPEAppropriate PPE
Eye ProtectionEye Protection
Hearing ProtectionHearing Protection
Other EmployeesOther Employees
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7474
HOSE CLAMPHOSE CLAMP
UNACCEPTABLEUNACCEPTABLE ACCEPTABLEACCEPTABLE
Pneumatic Tool Connections
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04/21/2304/21/23 Industrial Safety Lecture TwoIndustrial Safety Lecture Two 7575
REVIEWREVIEW 1. What must your employer provide in addition to the appropriate PPE?1. What must your employer provide in addition to the appropriate PPE? 2. What is the employee’s responsibility before using PPE?2. What is the employee’s responsibility before using PPE? 3. What is the greatest danger when wearing loose fitting clothing on the job?3. What is the greatest danger when wearing loose fitting clothing on the job? 4. How long should you shower if you come into contact with a dangerous chemical?4. How long should you shower if you come into contact with a dangerous chemical? 5. How much clearance should a hard hat webbing provide between your head and the top of 5. How much clearance should a hard hat webbing provide between your head and the top of
the shell? the shell? 6. Give the type of eye protection that protects from debris approaching from multiple angles?6. Give the type of eye protection that protects from debris approaching from multiple angles? 7. What units are used to measure noise?7. What units are used to measure noise? 8. In what areas should disposable ear plugs NOT be used?8. In what areas should disposable ear plugs NOT be used? 9. Before entering a confined space, the workers safety harness is attached to a 9. Before entering a confined space, the workers safety harness is attached to a
__________.__________. 10. What kind of respirator is worn in areas that contain little or no oxygen?10. What kind of respirator is worn in areas that contain little or no oxygen? 11. What is the first thing to do before using any tool?11. What is the first thing to do before using any tool? 12. Which of the “jaws” is the strongest on the 12. Which of the “jaws” is the strongest on the crescentcrescent wrench? wrench? 13. What is the name given to the wrench that 13. What is the name given to the wrench that ISIS meant to be struck with a hammer? meant to be struck with a hammer? 14. What do you call the condition of wear that refers to a badly worn striking surface?14. What do you call the condition of wear that refers to a badly worn striking surface? 15. When should you use a mallet in place of a hammer?15. When should you use a mallet in place of a hammer? 16. What is the difference between a regular knife and a safety knife?16. What is the difference between a regular knife and a safety knife? 17. What is the most important feature of an electrical power tool?17. What is the most important feature of an electrical power tool? 18. What is the greatest hazard with electrical tools?18. What is the greatest hazard with electrical tools? 19. State the purpose of a 19. State the purpose of a dead mandead man switch. switch. 20. When using compressed air for removing dirt, what should the maximum pressure be?20. When using compressed air for removing dirt, what should the maximum pressure be?