Environmental Engineering Reference
In-Depth Information
The.HBA.proceeds.from.data.collected.on.the.PBA.matrix.(see.Table 11.2)..The.
data.of.concern.are.those.found.in.rows
.
A.. Was.not.possible.and.practical.
.
B.. Was.possible.and.practical.but.not.provided.
.
C.. Was.provided.but.not.used.
.
D.. Was.provided.and.used,.but.failed.
Transfer. accidents. from. the. PBA. matrix. to. the. respective. HBA. tally. sheet. by.
doing.the.following:
.
1.. Accidents.in.A—record.any.accident.number.on.the.HBA.tally.sheet.that.
appears.four.times.in.the.A.category.
.
2.. Accidents. in. B,. C,. and. D—record. all. accidents. on. the. respective. HBA.
tally.sheet.that.appears.in.these.categories..(If.they.appear.more.than.once,.
record.them.more.than.once.)
The.PBA.matrix.categorized.the.accidents.into.two.groups..In.one.group,.a.physi-
cal.barrier.would.have.prevented.the.accident.(rows.B.and.D)..In.the.second.group.
(rows. A. and. C),. human. behavior. played. a. signiicant. role.. Accidents. A. and. C. are.
generally.caused.by.individuals.who.did.something.they.should.not.have.or.did.not.
do.something.they.should.have..All.industries.have.accidents.of.this.type..The.HBA.
is.our.tool.for.further.analysis.of.the.accidents.in.A.and.D,.where.human.behavior.
played.a.role..The.HBA.helps.us.answer.the.following.question:.If.a.person.could.
have.done.something.to.prevent.the.accident,.why.did.he.or.she.not?
After.recording.the.accidents.from.rows.A.and.C.on.the.HBA.Tally.Sheets.(see.
Tables 11.4.through.11.7),.the.data.are.ready.to.do.an.HBA..Go.back.to.the.accident.
abstract.and.for.each.accident,.ask.the.questions.to.determine.which.human.barrier.
was.operating.
When.analyzing.each.accident,.it.puts.one.in.a.forced.choice.situation..But.only.
select. one. of. the. ive. possible. human. barriers. as. the. cause. of. the. accident.. Using.
one's.experience.in.the.industry,.and.the.knowledge.of.the.industrial.operations.and.
procedures,.decide.which.of.the.human.barriers.you.think.probably.led.to.the.perfor-
mance.and.contributed.to.the.accident..Then.place.a.checkmark.in.the.column.under.
the.appropriate.barrier.for.that.accident..For.each.accident.on.the.HBA.Tally.Sheet,.
only.one.checkmark.can.be.in.one.of.the.ive.columns.
After. you. have. recorded. the. accidents. from. rows. B. and. D. on. the. HBA. Tally.
Sheets,.complete.those.forms.by.illing.in.the.blanks.with.the.barrier.that.was.not.
provided.and.the.barrier.that.failed,.respectively.
WrAP-uP oF PrelImInAry dAtA AnAlysIs
The.elements.of.the.PDA.have.been.reviewed..By.now.it.should.be.realized.that.this.
system. is.not.doing.the.thinking.for.us,.but,.instead,.provides.us.with.the.tools.to.
help.us.think.in.a.clearer,.more.consistent.manner..Its.design.intends.to.steady.our.
