Q&A Hero

Q: 86. Do automatically-closing dip tank covers qualify as an appropriate means of automatic extinguishment for dip tank fires?a. yesb. no

Q: 87. Compare the advantages of automatically closing dip tank covers with those of other automatic extinguishing systems for dip tanks.

Q: 88. Which of the following characteristics of dip tanks are used to determine whether automatic extinguishing facilities are needed? a. capacity of the tank b. purpose for which the tank will be used c. liquid surface area of the tank d. all of the above e. none of the above

Q: 89. A certain plant has two dip tanks of the same capacity. One is required by OSHA standards to have automatic extinguishment facilities. One is used for hardening and tempering, and the other is for general use in the application of coatings. Which one is required to have automatic extinguishment facility?

Q: 90. A certain plant has two dip tanks of the same capacity. Neither tank has an open surface area of more than four square feet. One is required by OSHA standards to have automatic extinguishment facilities, and the other is not required to have such facilities. From your knowledge of the OSHA requirements for dip tanks, select which of the following capacities these tanks have: a. 100 gallons b. 200 gallons c. 500 gallons d. 1000 gallons

Q: 75 If the temperature of a liquid is too low for a fire to be sustained on the top of the liquid, then you know thata. the temperature is below the flash point but above the firepointb. the temperature is below the firepoint but above the flash pointc. the temperature is below both the flash point and the firepointd. the temperature is below the firepointe. b and d abovef. none of the above

Q: 91. Explain how liquid surface area affects the requirement for automatic extinguishment facilities for dip tanks.

Q: 76 If the temperature of a liquid is high enough that a spark causes a flash at the liquid, then you know thata. the temperature is above the flashpointb. the liquid is flammablec. both of the aboved. none of the above

Q: 92. A frequent problem with dip tanks is keeping them covered when not in use. What constitutes "not in use?"

Q: 77. In qualitative terms describe the relationship between flash point and flammability and combustibility.

Q: 93. Which is a better choice for liquefied petroleum gas (LPG)? Why?

Q: 78. Which of the following characteristics is indicated by the diagram? a. flash point b. boiling point c. LEL d. none of the above

Q: 79. Calculate the amount of general exhaust ventilation (in room changes per hour) needed to control (prevent explosion) a general release of gasoline vapors of 4 cubic feet per minute in a room that measures 12'x 15'x 10'. State any necessary assumptions. Gasoline has the following characteristics: FLASH POINT: -40OF BOILING POINT: 36.1OC LEL: 1.5% UEL: 7.8% VAPOR DENSITY: 2.48

Q: 80. A room that measures 12'x 15'x 10' has general dilution exhaust ventilation of 1 room change per hour to prevent explosion. Calculate the maximum tolerable level of gasoline vapor leaking into the room atmosphere. State any necessary assumptions. Gasoline has the following characteristics: FLASH POINT: -40OF BOILING POINT: 36.1OC LEL: 1.5% UEL: 7.8% VAPOR DENSITY: 2.48

Q: 81. A glue-making process releases ethylene glycol that becomes generally diluted and interspersed throughout the plant atmosphere. The rate of release is 2.4 cubic feet per hour vapor volume at standard plant temperature and pressure. The plant ventilation system is of the general dilution type with make-up air being supplied at windows and doors throughout the plant area. The plant area is 4000 square feet and the average ceiling height is 12 feet. The problem is to specify the capacity of the general ventilation system required to maintain a steady state condition throughout this process area that protects against both health and safety hazards due to ethylene glycol. For your information in performing calculations the following data is provided:ETHYLENE GLYCOL (CH2OHCH2OH)Molecular weight: 62.1Boiling point: 197.5o CelsiusLEL: 3.2%Firepoint: -13o CelsiusFlash point: 232o FahrenheitAutoignition temperature: 752o FahrenheitVapor Pressure: 0.05 mm @ 20o CelsiusPEL: 50 ppm (Ceiling)(a) Calculate how much exhaust ventilation (in cubic feet per hour, general dilution type) is required to maintain safety hazards below explosive levels. Show your work.(b) Calculate how much exhaust ventilation (in cubic feet per hour, general dilution type) is required to maintain health hazards below OSHA-specified Action Levels (AL). Show your work.(c) Calculate how many plant area room changes per hour the level of ventilation calculated in part (b) would represent. Show your work.

Q: 82. Under certain conditions, combustible liquids become as easily ignitable as flammable liquids at room temperature. Explain these conditions and how they relate to flashpoint.

Q: 83. A common term used by safety engineers, safety managers, and emergency personnel is "bleve". Explain this term, what it means, and how the word is pronounced (what it rhymes with).

Q: 84. Transportation of a new explosive requires prior approval and the assignment of: a. a flashpoint b. an emergency fire procedure c. an EX-number d. a CAS number

Q: 85. A 1000-gallon dip tank is used for hardening and termpering using a flammable liquid. Is the dip tank required to have an automatic extinguishing facility?a. yesb. no

Q: 70. What term describing flammable liquids refers to that temperature below which the liquid does not give off sufficient vapors to cause a flash at the surface of the liquid?

Q: 55. "Liquids" excluded by NFPA from the definition of "flammable liquid" are those which have a vapor pressure: a. less than 40 pounds b. more than 40 pounds c. less than 100 pounds d. more than 100 pounds

Q: 71. What term describing flammable liquids refers to that temperature above which the liquid gives off sufficient vapors to cause a flash at the surface of the liquid?

Q: 56. The principal basis for classification of flammable liquids is: a. flashpoint b. firepoint c. volatility d. autoignition temperature

Q: 72. Define the term "flash point".

Q: 57. The "TAG closed tester" derives its name from a. the tag indicator device which is suspended in the liquid b. the term "TEST AND GROUND" c. the term "TEMPERATURE ABSOLUTE GAUGE" d. an abbreviation of a French name

Q: 73 The temperature at which a fire on the top of a flammable liquid is sustained is called. a. firepoint b. flash point c. LEL d. UEL

Q: 58. The most frequently used test for flashpoint is the a. Cleveland open cup test b. TAG closed tester c. Pensky-Martens closed tester method d. BLEVE test

Q: 74 The temperature above which a flammable liquid gives off vapors too rich ignite is called a. firepoint b. flash point c. LEL d. UEL e. none of the above

Q: 59. Which of the following is used to extinguish LPG fires? a. dry chemical portable fire extinguishers b. water c. CO2 d. BLEVE units

Q: 60. Label the temperatures (Fahrenheit) on the axes.

Q: 61. The diagram plots a. flammability vs. combustibility b. flash points vs. boiling points c. liquids vs. vapors d. class vs. division

Q: 62. Label the axes in the diagram.

Q: 63. Which of the following characteristics is indicated by the diagram? a. flash point b. boiling point c. UEL d. none of the above

Q: 64. Which of the following parameters of flammable liquids is shown on the diagram? a. flash point b. boiling point c. LEL d. none of the above

Q: 65. The design concept illustrated in the diagram on the left is.

Q: 66. The purpose of the device shown (as illustrated in the text) is to a. expand gases b. filter particulates c. bond containers d. eliminate static

Q: 67. The concentration of flammable vapors in the air that is sufficiently rich to ignite describes which of the following terms? a. flash point b. boiling point c. LEL d. UEL

Q: 68. What term describing flammable liquids refers to that concentration below which the vapors are too lean to ignite?

Q: 69. What term describing liquid refers to that concentration above which the vapors are too rich to ignite?

Q: 38. Filling tanks or containers generates static electricity due to the flow of the liquid.a. trueb. false

Q: 54. Which of the following is not considered a flammable liquid? a. acetone b. gasoline c. propane d. carbon disulfide

Q: 39. Use of a carbon dioxide fire extinguisher can subject the user to electrical shock.a. trueb. false

Q: 40. "Splash loading" generates static electricity.a. trueb. false

Q: 41. A "rest area" expansion chamber in a liquid flow line permits static electricity to bleed off.a. trueb. false

Q: 42. Static electrical discharge is a source of ignition for flammable liquid vapors.a. trueb. false

Q: 43. Small portable spraying apparatus not used repeatedly in the same location is exempt from spray painting standards.a. trueb. false

Q: 44. Electrical wiring inside spray booths, subject to deposits of combustible residue, must be in rigid conduit or in boxes or fittings containing no taps, splices, or terminal connections.a. trueb. false

Q: 45. Electrical equipment of any kind is prohibited in a spray area if subject to deposits of combustible residues.a. trueb. false

Q: 46. Automatic sprinkling systems are required in paint spray areas.a. trueb. false

Q: 47. If a sprinkler system is installed inside ventilation ducts for a spray area, sprinkler heads are needed on both sides of the filter system.a. trueb. false

Q: 48. Combustible residues contribute to the largest proportion of spray booth fires.a. trueb. false

Q: 49. Spray residue accumulations are difficult to detect and thus do not lead to many OSHA citations.a. trueb. false

Q: 50. Pure propane has a characteristic odor.a. trueb. false

Q: 51. Injury from liquid propane while opening the tank valve implies that the valve is defective.a. trueb. false

Q: 36. Floating roof tanks are more hazardous than fixed roof tanks.a. trueb. false

Q: 52. LPG tanks are required to have "bleed off" valves for removing condensed moisture.a. trueb. false

Q: 37. When dispensing Class I liquids into plastic containers, NFPA regulations require electrical bonding.a. trueb. false

Q: 53. Quick action with the proper fire extinguisher is the key to control of burning LPG.a. trueb. false

Q: 22. The ignition temperature for gasoline is higher than for paper.a. trueb. false

Q: 23. An empty tank can be more dangerous than a tank full of gasoline.a. trueb. false

Q: 24. Gasoline/air mixtures in which the gasoline vapors are held to less than 5% are considered safe.a. trueb. false

Q: 25. Gasoline will ignite at leaner concentrations than alcohol will.a. trueb. false

Q: 26. Alcohol will ignite at richer concentrations than gasoline will.a. trueb. false

Q: 27. Alcohol will ignite inside a drum more readily than gasoline will.a. trueb. false

Q: 28. Fires in underground gasoline tanks burn or explode with such intensity as to destroy much life and property around service stations.a. trueb. false

Q: 13. Classification of flammable liquids does not depend upon boiling point.a. trueb. false

Q: 229. Underground tanks of gasoline will not sustain combustion.a. trueb. false

Q: 14. Volatility of a liquid bears a close relationship to the boiling point of a liquid.a. trueb. false

Q: 30. If space permits, the safest place to locate tanks of gasoline is outside in overhead tanks.a. trueb. false

Q: 15. All flammable liquids are Class I liquids.a. trueb. false

Q: 31. Gasoline vapors are lighter than air and will therefore gradually rise and disperse.a. trueb. false

Q: 16. All Class I liquids are flammable liquids.a. trueb. false

Q: 32. Natural gas is lighter than air and will therefore gradually rise and disperse.a. trueb. false

Q: 17. All combustible liquids are Class II liquids.a. trueb. false

Q: 33. High octane aviation gasoline is more flammable than ordinary "regular" gasoline.a. trueb. false

Q: 18. All combustible liquids are Class III liquids.a. trueb. false

Q: 34. A broken light bulb can ignite vapors of flammable liquids.a. trueb. false

Q: 19. All Class II liquids are combustible liquids.a. trueb. false

Q: 35. Flammable liquid tank design is an engineering function and is therefore not discussed in federal safety standards.a. trueb. false

Q: 20. Some flammable liquids are Class III liquids.a. trueb. false