Environmental Engineering Reference
In-Depth Information
E
xPlAnAtion
of
PbA
If.in.Statement.1.it.is.thought.that.a.physical.barrier.on.the.energy.source.was.not.
possible.and.practical,.then.select.(A)..Once.(A).has.been.selected,.it.is.not.necessary.
to.check.(B),.(C),.and.4..Simply.go.to.Statement.2..In.looking.at.Statement.2,.decide.
if.a.physical.barrier.between.the.energy.source.and.the.person.was.not.possible.and.
practical,.then.again.choose.(A).and.proceed.to.Statement.3.
In.Statement.3,.(A).is.probably.not.the.proper.option.because.safety.glasses.pos-
sibly.would.have.prevented.the.accident..Thus,.proceed.through.the.remaining.state-
ments.(B),.(C),.and.(D).to.determine.the.proper.selection..Because.it.is.believed.that.a.
physical.barrier.on.the.person.was.possible.and.practical,.it.must.be.decided.if.it.was.
not.provided,.provided.but.not.used,.or.used.but.did.not.protect.the.person..Making.
that.choice.depends.on.personal.experience.and.knowledge.of.the.operation.
Therefore,.if.personal.knowledge.and.experience.lead.to.the.belief.that.the.opera-
tion.normally.does.not.provide.safety.glasses,.then.select.(B).and.go.to.Statement 4..
If. the. belief. is. that. the. industrial. operation. routinely. provides. safety. glasses. but.
workers.usually.do.not.use.them,.then.select.(C).and.proceed.to.Statement.4..If.the.
belief.is.that.the.industrial.operation.is.a.stickler.for.safety.glasses,.then.it.might.be.
suspected.that.glasses.were.worn.but.failed,.and.then.(D).should.be.selected.and.then.
proceed.to.Statement.4..If.in.looking.at.Statement.4.the.belief.is.that.a.time.or.space.
barrier.was.not.possible.or.practical,.then.again.select.(A).
The.choices.have.now.been.made:.1.was.(A),.2.was.(A),.3.for.purposes.of.the.exam-
ple.was.(C),.and.4.was.(A)..Record.the.answers.on.the.PBA.matrix.(see.Table 11.1).
The.PBA.matrix.is.simply.the.PBA.statements.in.a.different.format..Normally,.
many.accidents.will.be.analyzed..When.this.occurs,.the.accidents.are.numbered.so.
that.choices.for.each.accident.will.equal.four..If.the.example.was.accident.number.1,.
then.(1).would.be.placed.in.the.appropriate.cells.corresponding.to.the.selections.that.
were.made..In.this.example,.a.(1).would.be.placed.in.cells.1A,.2A,.3C,.and.4A..This.
now.completes.the.Physical.Barrier.Analysis.of.one.accident..A.listing.of.the.steps.
for.a.PBA.that.is.normally.followed.is:
.
1.. Gather.the.accidents.you.wish.to.analyze.
.
2.. Number.them.sequentially.
.
3.. Starting. with. number. 1,. read. the. abstract;. then. the. accident. should. be.
visualized.
.
4.. Ask. yourself. the. irst. group. of. four. questions. on. the. PBA. question. list..
Choose.one.of.the.four.that.best.represents.the.opinion.
.
5.. Ask. yourself. each. of. the. remaining. four. groups. of. questions.. Make. one.
selection.from.each.group.
.
6.. Transfer.your.selections.to.the.PBA.matrix.
humAn BArrIer AnAlysIs
When.discussing.physical.barriers,.the.indication.is.that.the.absences.of.a..physical.
barrier. increase. the. likelihood. of. accidents.. Therefore,. putting. the. appropriate.
.physical.barriers.in.place.should.reduce.or.prevent.those.kinds.of.accidents.
