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Exam 11: Flammable and Explosive Materials

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Question 1

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All combustible liquids are Class III liquids.

A) True
B) False

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Question 2

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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: -40^OF BOILING POINT: 36.1^OC LEL: 1.5% UEL: 7.8% VAPOR DENSITY: 2.48

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Since the contaminant will mix with the air in a general dilution exhaust ventilation system,sufficient makeup air must be continually introduced to keep the contaminant level at or below the LEL,which is stated above to be 1.5%. Vent rate = 1 room-chg/hour = 12'x15'x10' = 1800 ft³/hr Let X = the maximum allowable gasoline vapor leak Then X/1800 = 1.5% = 0.015 X = 1800 x 0.015 = 27 ft³/hr

Question 3

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What principal physical characteristic of gasoline makes it particularly hazardous to have basements in service stations?

Automatic sprinkling systems are required in paint spray areas.

Which of the following characteristics is indicated by the diagram?

Which of the following is best classified as a Class C explosive?

Electrical equipment of any kind is prohibited in a spray area if subject to deposits of combustible residues.

What two physical characteristics of a liquid are principally used to determine its flammability classification?

The most frequently used test for flashpoint is the

Label the temperatures (Fahrenheit)on the axes.

Do automatically-closing dip tank covers qualify as an appropriate means of automatic extinguishment for dip tank fires?

The ignition temperature for gasoline is higher than for paper.

Gasoline will ignite at leaner concentrations than alcohol will.

"Splash loading" generates static electricity.

Flashpoint is the temperature at which a fire on top of the liquid is sustained.

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?

The definition of "liquid" by NFPA as far as flammable liquids are concerned has little to do with vapor pressure.

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

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:

All Class I liquids are flammable liquids.