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Confined space Entry safety Guideline.ppt
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- 2. What is aConfined Space? • Is large enough and so configured that an employee can enter bodily and perform work; • Has limited or restricted means of entry or exit; • Is not designed for continuous human occupancy. • Unfavorable Natural Ventilation A space that:
- 3. Examples of ConfinedSpaces: • Tanks • Manholes • Boilers • Furnaces • Sewers • Silos • Hoppers • Vaults • Pipes • Trenches • Tunnels • Ducts • Bins • Pits
- 4. Examples of ConfinedSpaces: TANK SILO PIPELINE
- 5. Categorising Work Space *Space large enough to enter &; * Limited or Restricted entry or exit &; * Not designed for continuous worker occupancy. NO Not a confined Space YES Confined Space Hazardous Atmosphere Engulfment Hazard Configuration Hazard Any other recognized serious hazard Permit Required Confined Space Non Permit Required Confined Space YES NO Or Or Or
- 6. Typical Reasons forConfined Space Entry: Inspection of physical integrity and process equipment. Maintenance such as abrasive blasting and application of surface coatings. Tapping, coating, wrapping and testing of underground sewage, petroleum, steam and water piping system. Installing, inspecting, repairing and replacing valves, piping, pumps, motors, etc. in below ground pits and vaults. Cont... Cont...
- 7. Typical Reasons forConfined Space Entry: Cleaning to remove sludge and other waste materials. Repair, including welding and adjustments to mechanical equipment. Adjusting and aligning mechanical devices and components. Checking and reading meters, gauges , dials, charts and other indicators. Installing,splicing, repairing and inspecting electric and telephone cables. Rescue of workers who are injured or overcome inside the space.
- 8. Potential Hazards inConfined Spaces • Oxygen Deficiency <19.5% or >23.5% oxygen concentration • Combustibles - Methane - Hydrogen - Acetylene - Propane - Gasoline fumes • Toxic Materials - Carbon Monoxide - Hydrogen Sulfide - Welding fumes - Corrosives • Electricity • Heat Stress • Mechanical Hazards - Mixers Crushers
- 9. Oxygen Deficient Atmospheres 19.5% Minimum acceptable oxygen level. 15 - 19% Decreased ability to work strenuously. Impair coordination. Early symptoms. 12-14% Respiration increases. Poor judgment. 10-12% Respiration increases. Lips blue. 8-10% Mental failure. Fainting. Nausea Unconsciousness. Vomiting. 6-8% 8 minutes - Fatal, 6 minutes - 50% fatal 4-5 minutes - possible recovery. 4-6% Coma in 40 seconds. Death
- 10. Oxygen Enriched Atmospheres •Oxygen level above 21%. • Causes flammable and combustible materials to burn violently when ignited. • Hair, clothing, materials, etc. • Oil soaked clothing and materials. • Never use pure oxygen to ventilate. • Never store or place compressed tanks in a confined space.
- 11. Flammable Atmospheres • 2Critical Factors: - Oxygen content in the air. - Presence of a flammable gas, or vapor - Presence of dust (visibility of 5’ or less) • Proper air/gas mixture can lead to explosion • Typical Ignition Sources: - Sparking or electric tool. - Welding / cutting operations. - Smoking
- 12. Toxic Atmospheres • Productstored in a confined space: • Gases released when cleaning. • Materials absorbed into walls of confined space. • Decomposition of materials in the confined space. • Work performed in a confined space: • Welding, cutting, brazing, soldering. • Painting, scraping, sanding, degreasing. • Sealing, bonding, melting. • Areas adjacent to a confined space:
- 13. Temperature Extremes • Extremelyhot or cold temperatures. • Steam cleaning of confined spaces. • Humidity factors. • Extremely cold liquids. • Work processes inside the confined space can increase temperature extremes. • Personal protective equipment.
- 14. Other Hazards • Noise •Amplified due to acoustics within the space. • Damaged hearing, affect communication. • Slick / Wet Surfaces • Slips and falls. • Increased chance of electric shock. • Falling Objects • Topside openings expose workers inside confined space to falling objects.
- 15. ENTRY • The actby which a person intentionally passes through an opening into a permit required confined space. • Any part of the body passing through the opening is considered entry.
- 16. IDLH • IMMEDIATELY DANGEROUSTO LIFE OR HEALTH • Any condition which poses an immediate threat to the health of life on an entrant, or; • Would cause irreversible adverse health effects, or; • Would interfere with an individual’s ability to escape unaided from a permit space.
- 17. ENTRANT • The employeewho will physically enter the confined space to perform the work.
- 18. ATTENDANT • The employeewho remains outside the confined space and monitors the entrant(s); guards the space against unauthorized entry; warns the entrants of any unusual conditions; and summons the rescue personnel if needed.
- 19. Permit-Required Confined Space • APermit-Required Confined Space is confined space that has one or more of the following characteristics: • Contains or has the potential to contain a hazardous atmosphere; • Contains a material that has the potential for engulfing an entrant; • Has an internal configuration such that an entrant could become trapped or asphyxiated; or • Contains any other serious safety or health hazard.
- 20. Should include: Specific permitspace identification Purpose and date of entry Duration of authorisation Authorised entrants by name Name of authorised attendant and entry supervisor Actual hazards of the identified space Control and isolation methods to be used Acceptable entry conditions Permit System Permit System Cont... Cont...
- 21. Should include: Results ofinitial and periodic atmospheric testing Rescue and emergency services to be summoned Communication procedures authorised between attendant and entrants Equipment to be provided Other information as necessary Other permits, such as hotwork. Permit System Permit System
- 22. Entry Supervisor • The employeeresponsible for coordinating the entry into the confined space. This must be a team leader or foreman.
- 23. Responsible Person • Theperson directly responsible for the work being performed in the confined space. This can be the RCM, Site Engineer, SSO or other person qualified by training and experience.
- 24. Non-Permit Confined Space • Aconfined space that does not contain or, with respect to atmospheric hazards, have the potential to contain any hazard capable of causing death of serious physical harm.
- 25. Two Options forEntering Confined Spaces: • Permit-required Permit-required confined space confined space entry entry – For hazardous For hazardous or potentially or potentially hazardous hazardous confined space confined space work work • Non-permit Non-permit confined confined space entry space entry – For non- For non- hazardous hazardous confined confined space work space work
- 26. Permit-Required Confined Space EntryProcedure • Isolate the space • Ventilate the space • Conduct Toolbox Talks • Complete permit • Test the atmosphere • Enter the space
- 27. Isolate the Space fromall hazards • Close Valves – Double block & bleed, or – Blank flange • Empty the Space – Depressurize, vent & drain • Lockout/Tagout Equipment – Electrical sources – Rotating/reciprocating parts – Hazardous materials • Clean residue from the space
- 28. Ventilate the Space •Use mechanical ventilation – Fans – Air horns • Ventilate at the rate of at least four (4) volumes per hour – Larger spaces require more ventilation • Make sure air supply is not contaminated – Ventilation air supply must be from fresh air uncontaminated with flammables, toxins, etc.
- 29. Conduct a ToolBox Talks • Entire crew must attend – Attendants, entrants, entry supervisor • Review hazards of entry and work • Review PPE • Review procedure for contacting rescue – verify rescue available • Complete permit
- 30. Complete Entry PermitForm • Permit must be correctly and completely filled out prior to entry. • Permit must be activated by Entry Supervisor’s signature to be valid. • No entry is allowed without a valid permit. • Permits are valid for up to 8 hours. • When work is completed, permit form should be returned to safety. • Cancelled permits must be kept on file
- 31. Test the Atmosphere •Check for Oxygen Content: – At least 19.5% and less than 23.5% • Check for Combustibles: – Less than 10% of the LEL • Check for Toxic Gasses: – Most commonly carbon monoxide (PEL <35 ppm) – or any other hazardous materials as determined by the use of the space. In this order:
- 32. NOTICE: • Any timea limit is exceeded, no matter what the reason, all personnel shall immediately exit the space, and no others shall enter until atmospheric conditions are returned to safe levels. THERE ARE NO EXCEPTIONS TO THIS! THERE ARE NO EXCEPTIONS TO THIS!
- 33. Atmosphere Testing ShallBe Performed: • Prior to every entry when the space is vacant; • After a 10 minute ventilation period (if ventilation is necessary); • At least hourly for permit-required confined spaces. • More frequently, if conditions or suspicions warrant.
- 34. Always test the Alwaystest the air at various levels air at various levels to be sure that the to be sure that the entire space is safe. entire space is safe. Good Air Good Air Poor Air Poor Air Deadly Air Deadly Air Good air near Good air near the opening the opening does NOT mean does NOT mean there is good air there is good air at the bottom! at the bottom!
- 35. Enter the Spaceand Proceed with work: • An attendant shall be posted near the entrance for the duration of the work. He shall be in constant communication with the entrants while the job is in progress.
- 36. When the Jobis Done: • Remove all personnel, tools, and debris from the space. • Close the space. • Cancel the permit. • Review the job with the host employer (hazards, problems, other employers, etc.)
- 37. Non-Permit Confined SpaceEntry • Isolate the space • Ventilate the space • Evaluate the space - Test atmosphere - Assure justification conditions are met • Conduct tool box talks • Enter the space
- 38. Isolate the Space fromall hazards • Close Valves - Double block & bleed, or - Blank flange • Empty the Space - Depressurize, vent & drain • Lockout/Tagout Equipment - Electrical sources - Rotating/reciprocating parts - Hazardous materials • Clean residue from the space
- 39. • Use mechanicalventilation – Fans – Air horns • Ventilate at the rate of at least four (4) volumes per hour – Larger spaces require more ventilation • Make sure air supply is not contaminated – Ventilation air supply must be from fresh air uncontaminated with flammables, toxins, etc. Ventilate the Space
- 40. Evaluate the Space •Determine that the space meets all the conditions set forth in the non-permit justifications • Conduct atmospheric testing • Evaluation must be certified by SSO’ s sign. • Determine that the confined space does not: - contain or have the potential to contain a hazardous atmospher • Continuous mechanical ventilation not acceptable as good atmosphere - contain a material with the potential for engulfment - Has an internal configuration which could trap or asphyxiate, or - contain any recognized serious safety or health hazard
- 41. Enter the Spaceand Proceed with work: • If non-permit conditions change during the job, the space shall be immediately evacuated, and re-classified as a permit- required confined space; or conditions shall be returned to non-permit conditions and again certified as such by the SSO.
- 42. Contractor Confined Space Entry •Contractors must be informed of the hazards within the space. • Contractors must supply their own attendants – One attendant is acceptable for multiple companies’ entrants • Contractors must supply their own air monitors • Contractors must review entry after completion of job
- 43. Attendant Responsibilities • Tomonitor entrants during the job and during entry & exit to help insure their safety. – The attendant may not abandon his post for any reason while personnel are in the space unless relieved by another qualified attendant. • To monitor atmospheric conditions in the space prior to and during entry. • To control access to the confined space. • To summon emergency assistance as needed. • To assess hazards in and around the space, and take action on the same. • To keep records of confined space work, such as air test results, personnel entry/exit, etc.
- 44. Entrant Responsibilities • Toassure that the space has been adequately ventilated, isolated, emptied, or otherwise made safe for entry. • To immediately exit a space, without question, upon word of the attendant, no matter what the reason. • To follow all safety rules and procedures that apply to the job. • To be familiar with the work to be performed and the procedures that apply to the job. • To use the appropriate PPE whenever necessary.
- 45. Supervisor Responsibilities • Toassure adequate protection is provided to the entrants by verifying adequate lockout/tagout and that all hazards are securely isolated. • To support the attendant’s authority in controlling access to a confined space. • To verify that all personnel have exited prior to closing the space. • To assure that all personnel involved are aware of the hazards associated with the space. • To assure that rescue services are available prior to entry.
- 46. Hydrogen Sulfide • Decompositionof materials. Human waste. • Rotten egg odor at low concentrations. • Possibly no warning at high concentrations. PPM Effect Time 10 ppm Permissible Exposure Level 8 Hours 50 - 100 Mild Irritation - eyes, throat 1 Hour 200 - 300 Significant Irritation 1 Hour 500 -700 Unconsciousness, Death 1/2 - 1 Hour >1000 Unconsciousness, Death Minutes
- 47. Carbon Monoxide Carbon Monoxide •Odorless, Colorless Gas. Odorless, Colorless Gas. • Combustion By-Product. Combustion By-Product. • Quickly collapse at high concentrations. Quickly collapse at high concentrations. PPM PPM Effect Effect Time Time 50 50 Permissible Exposure Level Permissible Exposure Level 8 Hours 8 Hours 200 200 Slight headache, discomfort Slight headache, discomfort 3 Hours 3 Hours 600 600 Headache, discomfort Headache, discomfort 1 Hour 1 Hour 1000-2000 1000-2000 Confusion, nausea, headache Confusion, nausea, headache 2 Hours 2 Hours 1000-2000 1000-2000 Tendency to stagger Tendency to stagger 1 1/2 1 1/2 Hours Hours 1000-2000 1000-2000 Slight heart palpitation Slight heart palpitation 30 Min. 30 Min. 2000-2500 2000-2500 Unconsciousness Unconsciousness 30 Min. 30 Min.