OSHA-confined-Space--美国限制空间作业标准.ppt

CONFINED SPACE限制空间29 CFR 1910.146美国密闭空间标准OBJECTIVES 目标HDefine a Confined Space 限制空间定义HDefine a Permit-Required Confined Space 限制空间作业许可定义HBe Familiar with the OSHA Standard and the basic elements of the standard 熟悉OSHA标准和标准的元素HUnderstand the Hazards Associated with Confined Spaces and How to Detect Them 明白限制空间存在的危害以及如何查找它们HUnderstand How to Control Confined Hazards 如何控制风险HUnderstand Personal Protective Equipment 明白个人防护设备Confined Space:DefinitionHA Confined Space means a space that:HIs large enough and so configured that an employee can bodily enter and perform assigned work;andHHas a limited or restricted means for entry or exit(For example:tanks,vessels,silos,pits,vaults,hoppers);and,HIs not designed for continuous employee occupancy.Permit Required Confined Space:DefinitionHA Permit Required Confined Space means a confined space that has one or more of the following characteristics:HContains or has a potential to contain a hazardous atmosphere,HContains a material that has the potential for engulfing an entrant,Permit Required Confined Space:Definition(contd)HA Permit Required Confined Space means a confined space that has one or more of the following characteristics:HHas an internal configuration such that an entrant could be trapped or asphyxiated by inwardly converging walls or by a floor which slopes downward and tapers to a smaller cross-section.HContains any other serious safety or health hazard.Confined SpacesExamplesCharacteristics of Confined SpacesH(1)Internal configuration.(a)Open-there are no obstacles,barriers,or obstructions within the space.One example is a water tank.(b)Obstructed-the permit space contains some type of obstruction that a rescuer would need to maneuver around.An example would be a baffle or mixing blade.Large equipment,such as a ladder or scaffold,brought into a space for work purposes would be considered an obstruction if the positioning or size of the equipment would make rescue more difficult.Characteristics of Confined SpacesH(2)Elevation(a)Elevated-a permit space where the entrance portal or opening is above grade by 4 feet or more.This type of space usually requires knowledge of high angle rescue procedures because of the difficulty in packaging and transporting a patient to the ground from the portal.(b)Non-elevated-a permit space with the entrance portal located less than 4 feet above grade.This type of space will allow the rescue team to transport an injured employee normally.Characteristics of Confined SpacesH(3)Portal size.(a)Restricted-A portal of 24 inches or less in the least dimension.Portals of this size are too small to allow a rescuer to simply enter the space while using SCBA.The portal size is also too small to allow normal spinal immobilization of an injured employee.(b)Unrestricted-A portal of greater than 24 inches in the least dimension.These portals allow relatively free movement into and out of the permit space.Characteristics of Confined SpacesH(4)Space access.(a)Horizontal-The portal is located on the side of the permit space.Use of retrieval lines could be difficult.(b)Vertical-The portal is located on the top of the permit space,so that rescuers must climb down,or the bottom of the permit space,so that rescuers must climb up to enter the space.Vertical portals may require knowledge of rope techniques,or special patient packaging to safely retrieve a downed entrant.29 CFR 1910.146 Permit Required Confined SpacesHScope and ApplicationHDefinitionsHGeneral Requirements (to include development of written plan)HPermit-Required Confined SpacesHPermit SystemHEntry PermitHTrainingHDuties of Authorized EntrantsHDuties of AttendantsHDuties of Entry SupervisorsHRescue and Emergency ServicesHEmployee ParticipationAppendicesHAppendix A-Permit-required Confined Space Decision Flow Chart HAppendix B-Procedures for Atmospheric Testing.HAppendix C-Examples of Permit-required Confined Space Programs HAppendix D-Confined Space Pre-Entry Check List HAppendix E-Sewer System Entry HAppendix F-Rescue Team or Rescue Service Evaluation Criteria DefinitionsH“Acceptable entry conditions”means that conditions that must exist in a permit space to allow entry and to ensure that employees involved with a permit-required confined space entry can safely enter into and work within the space.DefinitionsH“Attendant”means an individual stationed outside one or more permit spaces who monitors the authorized entrants and performs all attendants duties assigned in the employers permit space program.DUTIES OF ATTENDANTSHKnows the hazards that may be faced during entryHIs aware of possible behavioral effects of hazard exposure in authorized entrants;HContinuously maintains an accurate count of authorized entrantsHRemains outside the permit space during entry operations until relieved by another attendant;HCommunicates with authorized entrants HMonitors activities inside and outside the spaceHSummons rescue and other emergency services Performs non-entry rescues as specified by the employers rescue procedureHPerforms no duties that might interfere with the attendants primary duty to monitor and protect the authorized entrants.DefinitionsH“Authorized entrant”means an employee who is authorized by the employer to enter a permit spaceDuties of Authorized EntrantsHKnow the hazards that may be faced during entry,including information on the mode,signs or symptoms,and consequences of the exposure;HProperly use equipment as required by paragraph(d)(4)of this section;HCommunicate with the attendant as necessary to enable the attendant to monitor entrant status and to enable the attendant to alert entrants of the need to evacuate the space as required by paragraph(i)(6)of this section;Duties of Authorized Entrants(contd)HAlert the attendant whenever:HThe entrant recognizes any warning sign or symptom of exposure to a dangerous situation,orHThe entrant detects a prohibited condition;andHExit from the permit space as quickly as possible whenever:HAn order to evacuate is given by the attendant or the entry supervisor,HThe entrant recognizes any warning sign or symptom of exposure to a dangerous situation,HThe entrant detects a prohibited condition,orHAn evacuation alarm is activated.DefinitionsH“Emergency”means any occurrence(including any failure of hazard control or monitoring equipment)or event internal or external to the permit space that could endanger entrants.DefinitionsH“Engulfment”means the surrounding and effective capture of a person by a liquid or finely divided(flowable)solid substance that can be aspirated to cause death by filling or plugging the respiratory system or that can exert enough force on the body to cause death by strangulation,constriction,or crushing.DefinitionsH“Entry”means the action by which a person passes through an opening into a permit-required confined space.Entry includes ensuing work activities in that space and is considered to have occurred as soon as any part of the entrants body breaks the plane of the opening into the space.DefinitionsH“Entry permit(permit)”means a written or printed document that is provided by the employer to allow and control entry into a permit space and that contains the information specified in section(f)of the standard.DefinitionsH“Entry Supervisor”means the person(such as an employer,foreman,or crew chief)responsible for determining if acceptable entry conditions are present at a permit space where entry is planned,for authorizing entry and overseeing entry operations,and for terminating entry as required by this section.HNote:An entry supervisor also may serve as an attendant or as an authorized entrant,as long as that person is trained and equipped as required by this section for each role he or she fills.Also,the duties of the entry supervisor may be passed from one individual to another during the course of entry operations.Duties of Entry SupervisorHKnows the hazards that may be faced during entry,including information on the mode,signs or symptoms,and consequences of the exposure;HVerifies,by checking that the appropriate entries have been made on the permit,that all tests specified by the permit have been conducted and that all procedures and equipment specified by the permit are in place before endorsing the permit and allowing entry to begin;HTerminates the entry and cancels the permit as required by paragraph(e)(5)of this section;Duties of Entry Supervisor(contd)HVerifies that rescue services are available and that the means for summoning them are operable;H Removes unauthorized individuals who enter or who attempt to enter the permit space during entry operations;andH Determines,whenever responsibility for a permit space entry operation is transferred and at intervals dictated by the hazards and operations performed within the space,that entry operations remain consistent with terms of the entry permit and that acceptable entry conditions are maintained.DefinitionsH“Hazardous atmosphere”means an atmosphere that may expose employees to the risk of death,incapacitation,impairment of ability to self-rescue(that is,escape unaided from a permit space,injury,or acute illness from one or more of the following causes:H(1)Flammable gas,vapor,or mist in excess of 10 percent of its lower flammable limit(LFL);DefinitionsH“Hazardous atmosphere”(contd)H(2)Airborne combustible dust at a concentration that meets or exceeds its LFL;NOTE:This concentration may be approximated as a condition in which the dust obscures vision at a distance of 5 feet or less.H(3)Atmospheric oxygen concentration below 19.5 percent or above 23.5 percent;DefinitionsH“Hazardous atmosphere”(contd)H(4)Atmospheric concentration of any substance for which a dose or a permissible exposure limit is published in Subpart G,Occupational Health and Environmental Control,or in Subpart Z,Toxic and Hazardous Substances,of this Part and which could result in employee exposure in excess of its dose or permissible exposure limit;HNOTE:An atmospheric concentration of any substance that is not capable of causing death,incapacitation,impairment of ability to self-rescue,injury,or acute illness due to its health effects is not covered by this provision.DefinitionsH“Hazardous atmosphere”(contd)H(5)Any other atmospheric condition that is immediately dangerous to life and health.HNOTE:For air contaminants for which OSHA has not determined a dose or permissible exposure limit,other sources of information,such as Material Safety Data Sheets that comply with the Hazard Communications Standard,section 1910.1200 of this Part,published information,and internal documents can provide guidance in establishing acceptable atmospheric conditions.DefinitionsH“Hot work permit”means the employers written authorization to perform operations(For example:riveting,welding,cutting,burning,and heating)capable of providing a source of ignition.H“Immediately dangerous to life and health(IDLH)”means any condition that poses an immediate or delayed threat to life or that would cause irreversible adverse health effects or that would interfere with an individuals ability to escape unaided from a permit space.DefinitionsH“Inerting”means the displacement of the atmosphere in a permit space by a noncombustible gas(such as nitrogen)to such an extent that the resulting atmosphere is noncombustible.H NOTE:This procedure produces an IDLH oxygen-deficient atmosphere.DefinitionsHIsolation means the process by which a permit space is removed from service and completely protected against the release of energy and material into the space by such means as:blanking or blinding;misaligning or removing sections of lines,pipes,or ducts;a double block and bleed system;lockout or tagout of all sources of energy;or blocking or disconnecting all mechanical linkages.DefinitionsHLine breaking means the intentional opening of a pipe,line,or duct that is or has been carrying flammable,corrosive,or toxic material,an inert gas,or any fluid at a volume,pressure,or temperature capable of causing injury.HNon-permit confined space means a confined space that does not contain or,with respect to atmospheric hazards,have the potential to contain any hazard capable of causing death or serious physical harm.DefinitionsHOxygen deficient atmosphere means an atmosphere containing less than 19.5 percent oxygen by volume.HOxygen enriched atmosphere means an atmosphere containing more than 23.5 percent oxygen by volume.DefinitionsHPermit-required confined space program(permit space program)means the employers overall program for controlling,and,where appropriate,for protecting employees from,permit space hazards and for regulating employee entry into permit spaces.PRCS WRITTEN PLAN OUTLINEHIntroduction-Company PolicyHDefinitionsHIdentification of Confined SpacesHNotification and WarningHHazard IdentificationHEquipment for Entry&RescueHEvaluation of Confined SpacesHPermitsHAuthorized EntrantsHAuthorized Attendants PRCS WRITTEN PLAN OUTLINE(contd)HEntry SupervisorsHEntry ProceduresHCommunications ProceduresHRescue ProceduresHClosure ProceduresHCoordination of Work With ContractorsHProgram Review and Update(Annually Required)HTraining Requirements and DocumentationDefinitionsHPermit system means the employers written procedure for preparing and issuing permits for entry and for returning the permit space to service following termination of entry.ENTRY PERMITSHPermit Space to be EnteredHPurpose of EntryHDate&Authorized Duration of PermitHAuthorized EntrantsHAuthorized AttendantsHName&Signature of Entry SupervisorHHazards of the Permit Space to be EnteredHIsolation of Hazard Control MeasuresHAcceptable Entry ConditionsHResults of Initial&Periodic Atmospheric MonitoringHRescue&Emergency ServicesHCommunications ProceduresHEquipment Required for Entry&rescue OperationsHOther Necessary Information and Other Required PermitsDefinitionsHProhibited condition means any condition in a permit space that is not allowed by the permit during the period when entry is authorized.DefinitionsHRescue service means the personnel designated to rescue employees from permit spaces.NOTE:Rescue personnel may be industry emergency personnel,an outside rescue service or a combination of teams.Rescue&Emergency ServicesH(k)Rescue and emergency services.H(1)An employer who designates rescue and emergency services,pursuant to paragraph(d)(9)of this section,shall:H(i)Evaluate a prospective rescuers ability to respond to a rescue summons in a timely manner,considering the hazard(s)identified;Rescue&Emergency ServicesHNote to paragraph(k)(l)(i):What will be considered timely will vary according to the specific hazards involved in each entry.For example,Sec.1910.134,Respiratory Protection,requires that employers provide a standby person or persons capable of immediate action to rescue employee(s)wearing respiratory protection while in work areas defined as IDLH atmospheres.Rescue&Emergency ServicesH(ii)Evaluate a prospective rescue services ability,in terms of proficiency with rescue-related task