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Ken Arp Industrial Hygienist Iowa OSHA Consultation and Ed. 515-281-0621 Direct 515-281-7629 General Confined Spaces & Three New Uses.

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Presentation on theme: "Ken Arp Industrial Hygienist Iowa OSHA Consultation and Ed. 515-281-0621 Direct 515-281-7629 General Confined Spaces & Three New Uses."— Presentation transcript:

1 Ken Arp Industrial Hygienist Iowa OSHA Consultation and Ed Direct General Confined Spaces & Three New Uses for the Backhoe For the Iowa Rural Water Association

2 OSHA and CONFINED SPACES Objectives Define Confined Space Define Permit Required Confined Space Explain the Hazards of Confined Spaces What is a Safe Confined Space Entry?

3 Which would you rather have?

4 OSHA STANDARDS ON CONFINED SPACES 29 CFR CFR (b)(4) [welding] 29 CFR (o) [telecommunications] 29 CFR (b)(6)(i) 29 CFR [excavations] 29 CFR 1915 Subpart B [shipyards]

5 (b)(6)(i) All employees required to enter into confined or enclosed spaces shall be instructed as to the nature of the hazards involved, the necessary precautions to be taken, and in the use of protective and emergency equipment required. The employer shall comply with any specific regulations that apply to work in dangerous or potentially dangerous areas. Current Confined Spaces Standard for Construction

6 (b)(6)(ii) Means any space having a limited means of egress, which is subject to the accumulation of toxic or flammable contaminates or has an oxygen deficient atmosphere. … storage tanks, process vessels, bins, boilers, ventilation or exhaust ducts, sewers, underground utility vaults, tunnels, pipelines, and open top spaces more than 4 feet in depth such as pits, tubs vaults and vessels.

7 Confined Space large enough and so configured that an employee can bodily enter and perform assigned work; and has limited or restricted means for entry or exit (e.g., tanks, vessels, silos, storage bins, hoppers, vaults, pits); and is not designed for continuous employee occupancy A space that is:

8 Standard Safety Requirements for Confined Spaces (ANSI Z ) Restricted entry and exit is a physical configuration, which requires the use of the hands or contortion of the body to enter into or exit from a confined space.

9 Questions to Ask Does the person have to use their hands to enter or exit the space? Is the person in an awkward posture when entering or exiting the space? Is a persons entry into or exit from the space slowed down or impeded by physical obstructions (such as pipes, ductwork, walls, holes in the floor, flanges, etc.)? Would an employee be forced to enter or exit in a posture that might slow self-rescue or make rescue more difficult?

10 LARGE RESTRICTED ENTRY/EXIT CONFINED SPACE enough to bodily enter Not designed for continuous occupancy

11 What about Dry Wells or Lift Stations? Confined Space? Depends

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13 Permit-required Confined Space Hazardous Atmosphere – <19.5% O 2 (Oxygen Deficient) – > 23.5% O 2 (Oxygen Enrichment) – >10% LEL for gas or vapor – >100% LEL for combustible dust – > IDLH – > PEL + acute, serious & impairs ability to escape A confined space with hazards = a PRCS

14 Permit Space (contd) ENGULFMENT ENTRAPMENT OTHER SERIOUS RECOGNIZED HAZARDS –Energy Sources Electrical Mechanical Pneumatic Hydraulic, etc. –Steam –Corrosives, etc.

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16 He hasnt moved in 15 minutes, should we do something? Contingency Plan GOT ONE?

17 Is this a confined space? ______ Why or why not? ___________________________________

18 Is this a confined space? ______ Permit Required? ___________________________________

19 Is this a confined space? ______ Permit Required? ___________________________________

20 Is this a confined space? ______ Why or why not? ___________________________________

21 Is this a confined space? ______ Permit required? _________________________________

22 I think our means of egress has just been restricted! Is this house (providing this is the only exit) now a confined space?

23 Is this a confined space? ______ Is this a permit-required confined space? ______ If yes, what hazards make this confined space a permit space? ___________________________________________

24 Is this a confined space? ______ Is this a permit-required confined space? ______ If yes, what hazards make this confined space a permit space? ___________________________________________

25 Is this a confined space? ______ Is this a permit-required confined space? ______ If yes, what hazards make this confined space a permit space? ___________________________________________

26 Sanitary Sewer Manholes Is this a confined space? ______ Is this a permit-required confined space? ______ If yes, what hazards make this confined space a permit space? ___________________________________________ Respect these places

27 Pits (e.g., elevator, escalator, pump, or valve) Manholes (e.g., sewer, electrical, or communication) Tanks (e.g., fuel, water, or other liquid/solid/ gas) Boilers Transformer vaults Examples of Confined Spaces

28 Examples of Non-Permit Confined Spaces From FR 1/14/93, p. 4475: –Vented vaults –Motor control cabinets –Dropped ceilings Other examples MAY include: –Crawl space under buildings –Air handling units (HVAC systems)*

29 Is this a confined space? ______ Is this a permit-required confined space? ______ If yes, what hazards make this confined space a permit space? ___________________________________________ Again, these can be very dangerous

30 Is this a confined space? ______ Is this a permit-required confined space? ______ If yes, what hazards make this confined space a permit space? ___________________________________________ Elevator Pit

31 Is this a confined space? ______ Is this a permit-required confined space? ______ If yes, what hazards make this confined space a permit space? ___________________________________________

32 Is this a confined space? ______ Is this a permit-required confined space? ______ If yes, what hazards make this confined space a permit space? ___________________________________________

33 Confined Space? Permit Required ? Hazards? Actual or Potential?

34 Confined Space Incidents >60% of the fatalities resulted from hazardous atmospheres % of fatalities are would-be rescuers. Usually entrants nor rescuers fully recognized the potential hazards associated with confined spaces. Most common hazardous atmospheres were – { "@context": "http://schema.org", "@type": "ImageObject", "contentUrl": "http://images.slideplayer.com/1406540/4/slides/slide_33.jpg", "name": "Confined Space Incidents >60% of the fatalities resulted from hazardous atmospheres.", "description": "60 - 70% of fatalities are would-be rescuers. Usually entrants nor rescuers fully recognized the potential hazards associated with confined spaces. Most common hazardous atmospheres were –

35 Safe Conditions? 4 Gas Meter

36 Or would this look better?

37 Limitations of Air Testing Devices You need to know how to use it WELL Sensitivity varies Interference Poisoning/Shelf Life of Sensors Temp/Humidity Operating Range Some Not Intrinsically Safe Must Be Zeroed/Recalibrated Battery Life Hazards must be known

38 Clearing the Air Why do atmospheres account for a majority of the fatalities?

39 BAD AIR Will incapacitate YOU 20,000 Gas Meters Oxygen Deficient Hydrogen Sulfide Carbon monoxide Carbon dioxide Nitrogen Quickly

40 Oxygen Deficiency 21% - Normal O2 level 19.5% - Minimum permissible O2 level 15-19% - Impaired coordination 12-14% - Pulse up, impaired judgement 10-12% - Respiration increases further, lips blue 8-10% - Fainting, ashen face 6-8% - 100% fatal in 8 minutes, 50% fatal in 6 minutes, 4-5 minutes recovery with treatment 4-6% - Coma in 40 seconds, convulsions, death

41 The Incidents 2 employees die from hydrogen sulfide at oil well – gas meters with employees Sioux City lagoon deer rescue Carbon dioxide 1 fatality Nitrogen – 2 fatalities - Tanker Anhydrous Ammonia fatality

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43 Ventilation controls

44 What is a Safe Atmosphere Less than 10% of lower flammable limit 19.5% to 23.5% Oxygen Atmosphere below the permissible exposure limit

45 Is 20% Oxygen Safe? How much oxygen is missing if your meter reads 20%? Whats 1% in parts per million? 10,000 Are there any gasses at 10,000 ppm that could harm you? Hundreds Carbon Monoxide is deadly at 500ppm ALWAYS TEST THE ATMOSPHERE

46 Which would you rather have?

47 And Finally, Last, and least important Three new uses for that backhoe

48 backhoe bucket / trench box - NOT

49 Knocking Down Really Tall Stuff - NOT

50 Shade on a hot day - NOT

51 Thank You, Its time to run


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