DCASE UNIT 7 SLIDES

Home > Preview

The flashcards below were created by user EL_GUAPO on FreezingBlue Flashcards.


  1. CONFINED SPACE
    • Restricted openings for entry/exit
    • Ventilation not expected to remove hazardous contaminants
    • May contain or produce hazardous contaminants or oxygen deficiencies or enrichment
    • Not intended for human entry/occupancy on a routine basis
  2. Examples of CONFINED SPACES
    • Tanks
    • Voids
    • Double bottoms
    • Interior machinery (boilers, condensers, oil sumps)
    • Non-ventilated storerooms
    • Ventilation & Exhaust ducts
  3. PERMISSIBLE EXPOSURE LIMIT (PEL)
    • The maximum permissible concentration of a toxic agent to which personnel may be exposed.
    • Published by OSHA (Force of Law)
    • Based on TWA for a normal 8-hr day, 40-hr week
  4. IMMEDIATELY DANGEROUS TO LIFE OR HEALTH (IDLH)
    • Any atmosphere that meets one or more of the following conditions
    •  Oxygen content < 19.5 or > 22%
    •  Flammable vapors at a concentration of ≥ 10% of the LEL
    •  Presence of toxicants above NIOSH IDLH limits
  5. IMMEDIATELY DANGEROUS TO LIFE OR HEALTH (IDLH)
    All fuel tanks, chemical tanks, sewage system tanks (including all piping associated with these systems) or similar high hazard areas shall be treated as IDLH regardless of test readings until the tank/area has been emptied, cleaned and ventilated to remove contaminants and is certified as Safe for Personnel by the GFE/GFEA.
  6. Reasons for Oxygen Deficiency
    • Eductors
    • Fires
    • Rusting (Oxidation)
    • Inerting
    • Spray Painting
    • Decomposing Organic Matter
    • Sewage
    • Fermentation of grains, sugars, etc.
    • Rotting plant or marine life
    • AFFF
  7. Carbon Monoxide (CO)
    • FROM INCOMPLETE COMBUSTION
    • COLORLESS, ODORLESS, TASTELESS
    • LIGHTER THAN AIR
    • SUBTLE ASPHYXIANT
    • FLAMMABLE
  8. Hydrogen Sulfide (H2S):
    • #2 Killer of Sailors
    • Colorless, Odorless, Tasteless, Inert
    • HEAVIER THAN AIR
    • Blunt Asphyxiant
    • NON-FLAMMABLE
    • DARK BROWN, PUNGENT GAS
    • HEAVIER THAN AIR
    • NON FLAMMABLE
    • CHOKING AGENT
    • (Absorbed)
  9. Methane (CH4)
    • Colorless, odorless, and lighter than air.
    • It is a product of aerobic decay of organic materials such as those found in CHT systems.
    • It is a flammable and gaseous hydrocarbon
  10. Hydrogen (H)
    • Extremely flammable, explosive, and lighter than air.
    • It can be present in battery charging spaces from wet cell batteries
    • It is also produced by formation of rust
  11. REFRIGERANTS (“FREON,” R-134A)
    • Colorless and Odorless
    • Heavier Than Air
    • NON-FLAMMABLE
    • Frostbite
    • Blunt Asphyxiant, Attacks Nervous System, Dry Land Drowning
    • HEAT = PHOSGENE
    • Reefer Decks, A/C Plants
  12. REFRIGERANTS (“FREON,” R-134A)
    • Commonly used in refrigeration systems or as a solvent.
    • Asphyxiant in high concentrations.
    • Vapors will decompose to phosgene and other products when exposed to an open flame or hot surface.
  13. Ammonia (NH3)
    • PUNGENT ODOR
    • LIGHTER THAN AIR
    • FLAMMABLE
    • CHOKING AGENT
  14. Additive Effects
    When more than one hazardous substance is present and their toxicological effects are similar, the following additive effects formula applies to the mixture.
  15. Additive Effects Equation
    • C1/T1 + C2/T2 + C3/T3 =
    • C = measured concentrations of substances
    • T = PEL of the substance
    • Additive Effects Equation
    • If the sum of these fractions is one or less, the PEL of the mixture is not exceeded.
    • If the sum exceeds one, the PEL of the mixture has been exceeded.
  16. REVIEW QUESTION #1
    • Oxygen < 19.5% or > 22%
    • Flammable vapors of 10% or > of LEL
    • Presence of toxicants above NIOSH IDLH limits
  17. REVIEW QUESTION #2
    • Name 4 Toxicants that are HEAVIER than Air:
    • CO2, H2S, HALON, Refrigerants
  18. REVIEW QUESTION #3
    • Name 3 Toxicants which are LIGHTER than Air:
    • CO, Hydrogen, Methane

Card Set Information

Author:
EL_GUAPO
ID:
336611
Filename:
DCASE UNIT 7 SLIDES
Updated:
2017-12-07 00:25:27
Tags:
DCASE
Folders:

Description:
Hazardous Atmospheres
Show Answers:

Home > Flashcards > Print Preview