safety through design bruce w. main, pe csp design safety engineering, inc. ann arbor, michigan 15...
TRANSCRIPT
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Safety Through DesignSafety Through Design
Bruce W. Main, PE CSPBruce W. Main, PE CSP
design safety engineering, inc.design safety engineering, inc.
Ann Arbor, MichiganAnn Arbor, Michigan15 Sept 200415 Sept 2004
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Problems…Problems…
SolutionsSolutions
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Safety in EngineeringSafety in Engineering
• Developing solutions to known hazardsDeveloping solutions to known hazards
• 2 robots, 5 stations2 robots, 5 stations
• area scanner vs light curtain vs fixed guardarea scanner vs light curtain vs fixed guard
• How to identify new hazardsHow to identify new hazards
• Things we don’t yet knowThings we don’t yet know
• Fall hazard of overhead maintenance workFall hazard of overhead maintenance work
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Story TimeStory Time
Range manufacturerRange manufacturer
• Anti-tip bracketsAnti-tip brackets
• Installation instructionsInstallation instructions
• On-product installation warningOn-product installation warning
• End user instructions manualEnd user instructions manual
• On-product user warningOn-product user warning
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Presentation OverviewPresentation Overview
• Safety through designSafety through design
• Why you should careWhy you should care
• Risk assessment basicsRisk assessment basics
• designsafedesignsafe demonstration and hints demonstration and hints
• ExamplesExamples
• On being an entrepreneur On being an entrepreneur
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Safety Through Design... Safety Through Design...
• Design - optimizing against criteriaDesign - optimizing against criteria
• Late changes in criteria - safetyLate changes in criteria - safety
• Getting it right the first time Getting it right the first time
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Familiar MethodsFamiliar Methods
• Government regulations (OSHA, FDA, etc.)Government regulations (OSHA, FDA, etc.)
• Industry standardsIndustry standards
• ChecklistsChecklists
• Safety factorsSafety factors
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“Recent” Advances“Recent” Advances
FMEA FMEA
• Failure Modes & Effects AnalysisFailure Modes & Effects Analysis
• Component failuresComponent failures
Risk assessmentRisk assessment
• People failuresPeople failures
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Safety Through Design…Safety Through Design…
• Getting it right the first time Getting it right the first time
• How?How?
• Risk assessmentRisk assessment
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Why you should care…Why you should care…
1.1. Your professors think it’s a good ideaYour professors think it’s a good idea
2.2. Your grade depends on itYour grade depends on it
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Other reasons to careOther reasons to care
• Industry standards are requiring risk assessmentIndustry standards are requiring risk assessment
• Europe - CE mark requires risk assessmentEurope - CE mark requires risk assessment
• Customers are beginning to require risk assessmentCustomers are beginning to require risk assessment
• Condition of saleCondition of sale
• Lots of momentum in industry in risk assessmentLots of momentum in industry in risk assessment
• Risk assessment worksRisk assessment works
• Better, cheaper, faster, more productiveBetter, cheaper, faster, more productive
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The Basics...The Basics...
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Risk Assessment Risk Assessment
Four parts:Four parts:
• Identify hazards *Identify hazards *
• Assess riskAssess risk
• Reduce risk *Reduce risk *
• Document the resultsDocument the results
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1. Set the Limits/Scope of the Analysis
2. Identify Tasks and Hazards
3. Assess Risk – Initial
Risk Scoring Systems
4. Reduce Risk
Hazard Control Hierarchy
5. Assess Risk - Residual
Risk Scoring Systems
7. Results / Documentation
6. Residual Risk
Acceptable?
Evaluation Complete
The
Ris
k A
sses
smen
t P
roce
ss
Yes
No
Re-
eval
uate
Tas
k
New or Next Hazard
The Risk Assessment Process
• Identify hazards
• Assess risk
• Reduce risk
• Document results
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Identify Hazards...Identify Hazards...
• Identify hazardsIdentify hazards
• Task-based is a very useful approachTask-based is a very useful approach
• Focuses on what people doFocuses on what people do
• Users/tasks/hazardsUsers/tasks/hazards
• Brainstorming grounded in realityBrainstorming grounded in reality
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Assess Risks...Assess Risks...
• Qualitative / semi-quantitative / Qualitative / semi-quantitative /
quantitativequantitative
• Working to achieve acceptable riskWorking to achieve acceptable risk• risk which remains after protective measures risk which remains after protective measures
have been takenhave been taken
• risk which is accepted in a given contextrisk which is accepted in a given context
• Zero risk does not existZero risk does not exist
• There is no one right approachThere is no one right approach
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B11 TR3 MatrixB11 TR3 MatrixB11 TR3 MatrixB11 TR3 Matrix
NegligibleNegligibleNegligibleNegligibleLowLowLowLowRemoteRemote
NegligibleNegligibleLowLowMediumMediumMediumMediumUnlikelyUnlikely
LowLowMediumMediumHighHighHighHighLikelyLikely
MediumMediumHighHighHighHighHighHighVery LikelyVery Likely
MinorMinor
SeveritySeverity
ModerateModerate
Level ofLevel of
SeriousSeriousCatastrophicCatastrophic
Probability Probability of of
Occurrence Occurrence of Harmof Harm
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MIL-STD-882D MatrixMIL-STD-882D MatrixMIL-STD-882D MatrixMIL-STD-882D Matrix
(E) IMPROBABLE(E) IMPROBABLE
( 10( 10-6 -6 > X ) > X )
(D) REMOTE(D) REMOTE
( 10( 10-3 -3 > X > 10> X > 10-6 -6 ))
(C) OCCASIONAL(C) OCCASIONAL
( 10( 10-2 -2 > X 10> X 10-3 -3 ))
(B) PROBABLE(B) PROBABLE
( 10( 10-1 -1 > X > 10 > X > 10-3 -3 ))
(A) FREQUENT(A) FREQUENT
( X > 10( X > 10-1 -1 ))
(4)(4)
NEGLIGIBLENEGLIGIBLE
(3)(3)
MARGINALMARGINAL
(2)(2)
CRITICALCRITICAL
(1)(1)
CATASTROPHICCATASTROPHIC
CATEGORY
FREQUENCY
UNACCEPTABLEUNACCEPTABLE
UNDESIRABLEUNDESIRABLE
ACCEPTABLE WITH REVIEWACCEPTABLE WITH REVIEW
ACCEPTABLE WITHOUT REVIEWACCEPTABLE WITHOUT REVIEW
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R15.06 MatrixR15.06 MatrixR15.06 MatrixR15.06 Matrix
Table 2 – Risk reduction decision matrix prior to safeguard selection
R4R4A1A1 Likely Likely
R3BR3BA2 A2 Not LikelyNot LikelyE1E1 Infrequent Infrequent
exposureexposure
R3AR3AA1A1 Likely Likely
R2CR2CA2 A2 Not LikelyNot LikelyE2 E2 FrequentFrequent
exposureexposureS1S1 Slight Injury Slight Injury
First-aidFirst-aid
R2BR2BA1A1 Likely Likely
R2BR2BA2 A2 Not LikelyNot LikelyE1 E1 InfrequentInfrequent
exposureexposure
R2AR2AA1A1 Likely Likely
R1R1A2 A2 Not LikelyNot LikelyE2E2 Frequent Frequent
exposureexposureS2S2 Serious Injury Serious Injury
More thanMore than
First-aidFirst-aid
RISK REDUCTIONRISK REDUCTION
CATEGORYCATEGORYAVOIDANCEAVOIDANCEEXPOSUREEXPOSURESEVERITY OF INJURYSEVERITY OF INJURY
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HFMEA Hazard Scoring MatrixHFMEA Hazard Scoring Matrix
Pro
bab
ilityP
rob
ability
Severity Severity CatastrophicCatastrophic MajorMajor ModerateModerate MinorMinor
FrequentFrequent 1616 1212 88 44
OccasionalOccasional 1212 99 66 33
UncommonUncommon 88 66 44 22
RemoteRemote 44 33 22 11
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Risk Scoring SystemsRisk Scoring Systems
• Bringing structure to a subjective analysisBringing structure to a subjective analysis
• There is no one right approachThere is no one right approach
• This is subjectiveThis is subjective
• Become comfortable with subjectivityBecome comfortable with subjectivity
• The goal is acceptable riskThe goal is acceptable risk
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Reduce Risk…Reduce Risk…
• A key component of the risk assessment A key component of the risk assessment
processprocess
• Involves feasibility, costs, effectiveness, Involves feasibility, costs, effectiveness,
practicality, etcpracticality, etc
• Optimizing design against the given criteriaOptimizing design against the given criteria
• Achieving acceptable riskAchieving acceptable risk
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The Safety Hierarchy…
Forms the theoretical basis for design safetyForms the theoretical basis for design safety
The preferred approach to addressing hazards is:The preferred approach to addressing hazards is:
1. Eliminate the hazard by design1. Eliminate the hazard by design2. Substitute less hazardous work methods or materials2. Substitute less hazardous work methods or materials3. Incorporate safety devices (guarding systems)3. Incorporate safety devices (guarding systems)4. Provide warning systems4. Provide warning systems5. Apply administrative controls (work methods, training)5. Apply administrative controls (work methods, training)6. Provide personal protective equipment (PPE)6. Provide personal protective equipment (PPE)
(Manuele: Innovations in Safety Management 2001(Manuele: Innovations in Safety Management 2001))
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Risk Assessment ResultsRisk Assessment Results
• New design requirements/criteria !!New design requirements/criteria !!• Assessment of risk: severity/probability ratingsAssessment of risk: severity/probability ratings• Road map for risk reduction activitiesRoad map for risk reduction activities• Framework for solutions (safety hierarchy)Framework for solutions (safety hierarchy)
• design changes, guarding systemsdesign changes, guarding systems• warnings, instructions, training, PPE requirementswarnings, instructions, training, PPE requirements
• Risk reduced to acceptable riskRisk reduced to acceptable risk
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A DemonstrationA Demonstration
designsafe…designsafe…
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Key Points about designsafeKey Points about designsafe
• Guides you through the risk assessment Guides you through the risk assessment processprocess
• Conforms to current standardsConforms to current standards• Helps you identify hazardsHelps you identify hazards• Prompts your risk reduction effortPrompts your risk reduction effort• Creates the documentationCreates the documentation
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Too Much Residual Risk? What do you do?Too Much Residual Risk? What do you do?
Reduce Reduce
TransferTransfer
AvoidAvoid
AcceptAccept
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When do we accept risk?When do we accept risk?
• When it’s insignificantly low.When it’s insignificantly low.
• When we are sure it is worth it.When we are sure it is worth it.
• When we do not know it is there.When we do not know it is there.
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Tips on using designsafe…Tips on using designsafe…
• It is a guide. Use your head.It is a guide. Use your head.• Keep your eye on the goal Keep your eye on the goal
• Identify hazardsIdentify hazards• Reduce risks to an acceptable levelReduce risks to an acceptable level
• Risk scoring is not a scientific exercise.Risk scoring is not a scientific exercise.• Look for effective shortcutsLook for effective shortcuts
• All users, all tasksAll users, all tasks• Cut, copy, pasteCut, copy, paste
• Make it work for you.Make it work for you.
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Example – Large Oven SystemExample – Large Oven System
• Oven system to bake finish on partsOven system to bake finish on parts
• Elevated, overhead locationElevated, overhead location
• Access required from time to timeAccess required from time to time
• Service conveyor, ovenService conveyor, oven
• Retrieve fallen partsRetrieve fallen parts
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View Inside of OvenView Inside of Oven
Fallen Parts
Tripping Hazards
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ProblemsProblems
• Lighting insufficientLighting insufficient
• Access difficultAccess difficult
• Introduced hazards to the workplaceIntroduced hazards to the workplace
• Task-based risk assessment finds theseTask-based risk assessment finds these
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Perishable Goods ProcessingPerishable Goods Processing
• Packaging system to extend food shelf lifePackaging system to extend food shelf life
• Automated production system in operationAutomated production system in operation
• Sales wants small, manual system Sales wants small, manual system
• customers can “try before they buy”customers can “try before they buy”
• Prototype hand-held design in developmentPrototype hand-held design in development
• Risk assessment performedRisk assessment performed
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New hazards identified New hazards identified
• Electrical equipment in wet environmentElectrical equipment in wet environment• not hard wirednot hard wired
• Complex/confusing operation Complex/confusing operation • unmarked/confusing controls unmarked/confusing controls • high probability for operator errorhigh probability for operator error• equipment damage could occur if not equipment damage could occur if not
properly doneproperly done• Hand puncture – needle stickHand puncture – needle stick
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Changes MadeChanges Made
• GFI addedGFI added• Design changes to greatly simplify Design changes to greatly simplify
proceduresprocedures• Entirely eliminated need for operator to Entirely eliminated need for operator to
adjust controlsadjust controls• Improved user information – manual, Improved user information – manual,
warnings, system ‘packagewarnings, system ‘package’’
• Puncture resistant gloves addedPuncture resistant gloves added
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Common ThemesCommon Themes
• Must identify hazards earlyMust identify hazards early
• Early is better, faster, cheaper and more effectiveEarly is better, faster, cheaper and more effective
• Task based risk assessment helps identify more Task based risk assessment helps identify more
hazards hazards
• Allows engineers to reduce risksAllows engineers to reduce risks
• Risk assessment helps to determineRisk assessment helps to determine
• What, why, how and how muchWhat, why, how and how much
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ReviewReview
• Problems… SolutionsProblems… Solutions
• Safety through designSafety through design
• Why you should careWhy you should care
• Risk assessment basicsRisk assessment basics
• Demonstrated the process - Demonstrated the process - designsafedesignsafe
• Example risk assessment applicationsExample risk assessment applications
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Entrepreneur Fairy TaleEntrepreneur Fairy Tale
• Great ideaGreat idea
• Solid teamSolid team
• Adequate financial resourcesAdequate financial resources
• You build it, they comeYou build it, they come
• Cash out rich Cash out rich
• 6 – 36 month run6 – 36 month run
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Entrepreneurial RealityEntrepreneurial Reality
• The idea is the easy partThe idea is the easy part
• Money – available, time, expensive, stringsMoney – available, time, expensive, strings
• Issues of controlIssues of control
• Sales – life bloodSales – life blood
• Personal investmentPersonal investment
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The EntrepreneurThe Entrepreneur
• EnergyEnergy
• SupportSupport
• Money Money
• Business ideaBusiness idea
• Execution and salesExecution and sales
• Discipline and stamina – how long can you sprint?Discipline and stamina – how long can you sprint?
• Fun - defining success your wayFun - defining success your way
??!!
!!!!
!!!!!!