Confined-Space-Entry---Environmental-Health-.ppt
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1、Confined Spaces“Non-Permit”“Permit-Required”ETSU Confined SpacesPhysical Plants Confined Physical Plants Confined Space PolicySpace PolicyApproved October 17,2019Approved October 17,2019The space is not designed for continuous The space is not designed for continuous employee occupancyemployee occup
2、ancyThe space is large enough to enter and The space is large enough to enter and perform workperform workThe space has limited The space has limited means of entry and exitmeans of entry and exitConfined Space DefinedConfined Space Examples TanksTanks ManholesManholes BoilersBoilers FurnacesFurnace
3、s SewersSewers HoppersHoppers VaultsVaults PipesPipes TunnelsTunnels BinsBins PitsPits SilosSilosNot Designed for Continuous Worker OccupancyMost confined spaces are not designed to enter Most confined spaces are not designed to enter and work in on a regular basis.and work in on a regular basis.The
4、 space encloses materials or processes.The space encloses materials or processes.Occasional worker entry for inspection,repair,Occasional worker entry for inspection,repair,cleanup,maintenance,etc.cleanup,maintenance,etc.Permit-Required Confined SpaceA Permit-Required Confined Space is a confined sp
5、ace that has one or more of the following characteristics:Contains or has the potential to Contains or has the potential to contain a hazardous contain a hazardous atmosphere;atmosphere;Contains a material that has the Contains a material that has the potential for engulfing an potential for engulfi
6、ng an entrant;entrant;Has an internal configuration Has an internal configuration such that an entrant could such that an entrant could become trapped or asphyxiated;become trapped or asphyxiated;oror Contains any other serious Contains any other serious safety or health hazard.safety or health haza
7、rd.Non-Permit Confined Space A non-permit confined space does not contain or,with respect to atmospheric hazards,have the potential to contain any hazard capable of causing death of serious physical harm.A permit-required confined space can be reclassified as a non-permit space.ENTRY by Entrant The
8、act by which a person passes through an opening into a permit-required confined space.Occurs during work activities when the entrants body breaks the plane of an opening into the spaceCategorizing the Work SpaceSpace large enough to enter&;Limited or Restricted entry or exit&;Not designed for contin
9、uous worker occupancy.NONot a Confined SpaceYESHazardous Atmosphere Engulfment Hazard Configuration Hazard Any other recognizedserious hazardPermit-Required Confined SpaceNonPermit-Required SpaceYESNOOrOrOr Confined SpaceTo reclassify a permit-required confined space,a pre-entry checklist shall be c
10、ompleted and certified by an entry supervisor prior to entry.Confined Space EntryThe checklist shall contain the date,the location of the space,and the signature of the person providing the certification.Pre-Entry ChecklistPhysical Plant employees shall follow the pre-entry procedures that establish
11、 safe entry for our employees.Pre-Entry ProceduresUnfavorable Natural VentilationLack of air movement in and out of the space can create an atmosphere much different than the outside atmosphere.Deadly gases can be trapped inside.Organic materials can decompose.May not be enough oxygen due to presenc
12、e of other gases or chemical reactions such as rusting.Confined Space Entry-HazardsManholes often remaincovered for long periodsof time.Poisonous gases,such as hydrogen sulfidecan accumulate inside ofmanholes.H2SManholes may alsoaccumulate highlyflammable gasessuch as methane.CH4Oxygen Deficient Atm
13、ospheres19.5%19.5%Minimum acceptable oxygen level.Minimum acceptable oxygen level.15-19%15-19%Decreased ability to work strenuously.Decreased ability to work strenuously.Impair coordination.Early symptoms.Impair coordination.Early symptoms.12-14%12-14%Respiration increases.Poor judgment.Respiration
14、increases.Poor judgment.10-12%10-12%Respiration increases.Lips blue.Respiration increases.Lips blue.8-10%8-10%Mental failure.Fainting.NauseaMental failure.Fainting.NauseaUnconsciousness.Vomiting.Unconsciousness.Vomiting.6-8%6-8%8 minutes-fatal,6 minutes-50%fatal8 minutes-fatal,6 minutes-50%fatal4-5
15、minutes-possible recovery.4-5 minutes-possible recovery.4-6%4-6%Coma in 40 seconds.DeathComa in 40 seconds.DeathOxygen Enriched AtmospheresOxygen level above 21%.Causes flammable and combustible materials to burn violently when ignited.Never use pure oxygen to ventilate.Never store or place compress
16、ed tanks in a confined space.Flammable AtmospheresCritical Factors:n nOxygen content in the air.Oxygen content in the air.n nPresence of a flammable gas,or vaporPresence of a flammable gas,or vaporn nPresence of dust (visibility of 5 or less)Presence of dust (visibility of 5 or less)Ignition Sources
17、:(Hot Work Permit)n nSparking or electric toolSparking or electric tooln nWelding/cutting operationsWelding/cutting operationsn nSmokingSmokingHydrogen SulfideDecomposition of materials.Human waste.Rotten egg odor at low concentrations.Possibly no warning at high concentrations.PPMEffectTime10 ppm10
18、 ppmPermissible Exposure LevelPermissible Exposure Level8 Hours8 Hours50-10050-100Mild Irritation-eyes,throatMild Irritation-eyes,throat1 Hour1 Hour 200-300 200-300Significant IrritationSignificant Irritation1 Hour1 Hour 500-700 500-700Unconsciousness,DeathUnconsciousness,Death1/2-1 Hour1/2-1 Hour 1
19、000 1000Unconsciousness,DeathUnconsciousness,DeathMinutesMinutesCarbon MonoxideOdorless,Colorless Gas.Combustion By-Product.Quickly collapse at high concentrations.PPMEffectTime 50 50Permissible Exposure LevelPermissible Exposure Level8 Hours8 Hours 200 200Slight headache,discomfortSlight headache,d
20、iscomfort3 Hours3 Hours 600 600Headache,discomfortHeadache,discomfort1 Hour1 Hour 1000-2000 1000-2000Confusion,nausea,headacheConfusion,nausea,headache2 Hours2 Hours 1000-2000 1000-2000Tendency to staggerTendency to stagger1 1/2 Hours1 1/2 Hours 1000-2000 1000-2000Slight heart palpitationSlight hear
21、t palpitation30 Min.30 Min.2000-2500 2000-2500UnconsciousnessUnconsciousness30 Min.30 Min.?Fresh outsideair is blown intothe space to diluteand removecontaminants,andsupply oxygen.O2If concentrations ofgases and vapors are found to be at harmful levels,the confined space must be ventilated beforeent
22、ry.Confined Space Entry-HazardsO2O2O2Fresh AirTesting The AtmosphereVerify presence of safe work atmosphere.Test at various depths of a confined space.n nTop,Middle,BottomAlwaysAlways test thetest theair at various levels air at various levels to be sure that theto be sure that theentire space is sa
23、fe.entire space is safe.Good air near the Good air near the opening does NOT opening does NOT mean there is good mean there is good air at the bottom!air at the bottom!Methane is lighter than air.Methane is lighter than air.Carbon Monoxide is the Carbon Monoxide is the same as air.same as air.Hydrog
24、en Sulfide is Hydrogen Sulfide is heavier than air.heavier than air.Emergency ProceduresCall911It It is is very very important important to to communicate communicate to to the the dispatcher dispatcher that that a a confined confined space rescue is necessary.space rescue is necessary.Should condit
25、ions develop which require extrication,and the entrant cannot get out of the confined space on their own,the attendant must call for emergency assistance at once!BARRIERS and BARRIERS and SIGNS must be SIGNS must be placed around any placed around any openings to protect openings to protect the entr
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- Confined Space Entry Environmental Health
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