F.O. CLASS #9 - Week of 11/25/18: AUC 207 Addendums #3 - 11, T.B. – Emergency #1 (Elevators), Haz Mat #1, Eng Ops #8 & 9 Instructor: DC Jim DiDomenico Flashcards Preview

Fire Officer Fall 2018 > F.O. CLASS #9 - Week of 11/25/18: AUC 207 Addendums #3 - 11, T.B. – Emergency #1 (Elevators), Haz Mat #1, Eng Ops #8 & 9 Instructor: DC Jim DiDomenico > Flashcards

Flashcards in F.O. CLASS #9 - Week of 11/25/18: AUC 207 Addendums #3 - 11, T.B. – Emergency #1 (Elevators), Haz Mat #1, Eng Ops #8 & 9 Instructor: DC Jim DiDomenico Deck (64)
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1. An officer conducting drill on elevator operations was incorrect in which one of the following points? (TB - Elevator—2.4.1, 2.4.2, 3.2.1 C, D, F 3.2.2)
A. A stuck elevator with trapped passengers becomes an emergency if there is fire endangering the passengers, a passenger is injured, or a passenger is in panic.
B. The location of the counterweight will indicate the exact location of the elevator car.
C. If the counterweight or governor ropes are seen moving, this indicates a car in motion
D. If the emergency bell is ringing, instruct the passengers to deactivate it

1. B

D. The location of the counterweight can be used to approximate the position of the car. For example, in a 6 story building where the elevator serves the basement, if the counterweight is on the 1st floor, the stalled car would
be at the 5th. The counterweight can be located by viewing through the wire glass door panel or by opening a hoistway door.

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2. A ladder company arrives at an incident where they have a report of a stuck elevator on the 6th floor of a 26-story multiple dwelling. On arrival at the 6th floor, they note that the passengers have activated the Emergency Stop Button. Regarding the use of primary removal procedures in this situation, they would be correct to think? (TB - Elevator—3.3, 3.3.1 A, B, 3.3.2, 3.4)
A. An elevator mechanic must be called before attempting any primary removal procedures
B. Electrical contacts must be checked before placing an elevator into Fireman Service
C. They should have passengers press either the door open button or the lobby call button. Either one of these tactics will override the Emergency Stop Button.
D. Placing the elevator into Fireman Service-Phase 1 will override the Emergency Stop Button

2. D

3.4 Summon an elevator mechanic if Primary Removal Procedures fail.

The first type of primary removal procedures checks whether simple electrical contacts might have been broken. However, if the passengers have activated the
Emergency Stop Button, these methods will not work. The passengers must be instructed to deactivate the Emergency Stop Button.

A. Have a passenger press Door Open Button. If the car is level with the landing this may open both the car and hoistway door.
B. Press lobby call button.

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3. If secondary removal procedures are necessary at an elevator operation, an Officer should know that? (TB Elevators—3.4.3, 3.5.1, 3.5.1 A, 3.5.1 C4, 3.5.2 C, 3.6.3 B)
A. Secondary removal procedures may not be initiated until the arrival of an elevator mechanic
B. Power removal is essential when using a secondary procedure. One handie-talkie equipped member with forcible entry tools should be sent to shut power to the stalled car.
C. Members shutting power to a stalled car must never turn the power back on to that car during any secondary removal procedure
D. Members operating in a shaft are to be secured by a life-saving rope

3. D

3.4.3 Secondary Removal Procedures may be initiated prior to the arrival of the mechanic.

Dispatch two members to the elevator machinery room to shut off the power to the stalled car.

This is the only circumstance in which the elevator power may be restored by members of this department. If this procedure fails, power must be shut off and members are not to restore power after completion of operations.

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4. During secondary removal procedures at an elevator operation, an Officer would be correct to think that? (TB Elevators—3.5.2 B, D, E, F)
A. Any passenger removed from a car between floors should always be taken up and out to eliminate any possibility of them falling down the shaft
B. Members shall never be permitted to enter the shaft below the elevator car
C. Elevators shall never be jacked up or moved in an upward direction as this may free the car
safeties
D. Prying or adjusting the elevator brake may be attempted only if power is assured off

4. C

F. No adjustment to or prying of the elevator machinery brake shall be attempted. The brake will be in a safe position and should not be tampered with.

E. The elevator shall never be jacked up or moved in an upward direction. This action may free the car safeties causing the car to move either upward or downward depending on the live load in the car.

D. Members shall not normally be permitted to enter the shaft below the elevator car. During a rescue necessitating members entering the shaft below the car, the power switch must be turned off.

B. When passengers are removed from a car between floors they should be taken up and out of the car if practical. This eliminates the possibility of a passenger falling down the shaft after exiting the elevator. If they are removed to the lower landing, the shaft opening must be protected.



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5. An officer arrives at a stuck elevator where he determines that the elevator has a two speed system. He decides to attempt to restart the stuck elevator car. In this situation the Officer would be incorrect to think? (TB Elevators 3.6)
A. Two speed systems are commonly found in buildings over 10 stories
B. The officer should order power shut to the stuck car and then power turned back on again
C. If an Emergency Stop Button was activated, have it deactivated before turning power off
D. If the car is to restart, it will do so within 20 to 30 seconds

5. D

C. If the car is to restart it will do so within 10 seconds.

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6. Members operating at a multi-car hoistway elevator emergency are attempting to use the POLING procedure. In this situation, they should know that from the adjacent car they can trip the lock by? (TB Elevators—3.6.4 D)
A. Depressing the roller on a hinged door; Pushing up on the locking arm on a sliding door
B. Depressing the roller on a sliding door; Pushing up on the locking arm on a hinged door

6. A

D. Member in the adjacent car inserts pole or hook between the striking post and the hoistway door and trips the lock by either depressing the roller or pushing on the locking arm.

1. Hinge type door - Depress the roller.

2. Sliding type door - push up on locking arm.

E. Member on the landing near hoistway door of the stuck car opens hoistway door when the lock is disengaged.

F. Elevator car door is then opened.

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7. A ladder company is performing a top hatch emergency removal of three passengers who were injured in an elevator accident. In this situation, they would be correct to think that? (TB Elevators—3.7A—3, 4, 5, 8)
A. When lowering a portable ladder to the elevator roof, an extension ladder is preferred, with the halyard tied around the rungs of both sections.
B. All members in the shaft shall be secured with a Life-Saving Rope, and a maximum of three firefighters are permitted on the elevator roof at one time.
C. The order of removal of the trapped passengers shall be determined by the Ladder Officer
D. During removal, members shall maintain physical contact with each trapped person and insure the civilians are secured with a Life-Saving Rope

7. D

3. Lower a portable ladder to the elevator roof. Use straight ladder if possible. If an extension ladder is used tie the halyard around the rungs of both sections of the ladder. This will prevent the lower section from dropping on to the car roof.

4. Climb down to the car roof. Maximum of two firefighters are to be permitted on the roof of the car at one time.

9. Members are to remain in physical contact with trapped persons while they are being removed.

8. One member equipped with a handie talkie enters car. Member in the car must determine the order of removal. Secure each person with a life saving rope.


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8. A ladder company is performing a side exit emergency removal of two passengers who are both panicking in a stuck elevator. In this situation, they would be incorrect to think that? (TB Elevators—3.7—3, 6, 7, 8)
A. The rescue car must be brought even with the stuck elevator. If a mechanic is present, use his operating key to bring the car level
B. Power must be removed to the rescue car before beginning the side exit removal
C. Planks of sufficient length — 4' or longer should be used as a bridge
D. Both the members and passengers must be secured to a Life-Saving Rope

8. C

6. Planks of sufficient lengths (6' or longer) should be used as a bridge between cars.

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9. A ladder company is operating at an elevator emergency where they are going to attempt forcible entry of the hoistway and elevator car door. In this situation, it would be correct to state? (TB Elevators—3.7.3, 3.7.3 B 1, 2)
A. Forcible entry should only be attempted under the direct advisement of an elevator mechanic. There are no exceptions to this policy.
B. The Rabbit Tool is the preferred forcible entry method
C. If using an Air Bag, place it midway between (centered) the top and bottom of the door
D. If using an Air Bag, position it to permit the center of the bag to be as close as possible to
the door edge

9. D

Forcible entry of hoistway and elevator car doors should only be attempted under the direct advisement of an elevator mechanic or as a last resort during EMERGENCY REMOVAL PROCEDURES. The deformation of the doors and locks may add to the problem and delay the rescue. Upon completion of forcible entry operations have maintenance personnel secure the hoistway door or have police or security warn people of the danger.

1. Maxi Force Air Bag System.

This is the preferred forcible entry method. It is less likely than the others to push the door off its hangers or out of its track.

b. Place bag between the leading edge of the door and jamb as high as possible to apply a more direct force on the linkage and the locking mechanism.

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10. An officer drilling on elevator pit operations was correct to state? (TB Elevator—4.1-4.2)
A. For Jump Pit operations, after shutting power to the elevator, enter the pit via the lowest hoistway door using a portable ladder. For additional safety, trip the lower limit switch and secure it in the closed position
B. For Walk-In Pit operations, after shutting power to the elevator, enter via the pit door at the bottom of the shaft. Emergency elevator keys are required to open this pit door
C. Never enter a Walk-In Pit before the elevator power switch is off.
D. Buffers found in Walk-In pits may be filled with combustible or inflammable liquid

10. D

4.2.1
Jump Pit.

A. Shut off elevator power switch.

B. Open the lowest hoistway door on shaft.

C. Use portable ladder to enter shaft.

D. For additional safety, trip lower limit switch and secure it in an open position.

4.2.2
Walk In Pit.

A. Shut off elevator power switch.

B. Enter via pit door.

C. If there is a fire in the pit, be cautious of the buffers (a device designed to stop a descending elevator beyond the normal limits of travel), they may be filled with combustible or inflammable liquid.

D. In an EXTREME EMERGENCY (immediate action necessary to save life) entry to a Walk in Pit before the elevator power switch is off may be made using the following precautions:

1. Open a hoistway door on shaft to be entered. The interlock will prevent car from moving.

2. Use caution around mechanical and electrical components.

3. Turn off power as soon as possible.

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11. BC Question - In regard to the requirements for Firemen Service elevators, a BC would be incorrect to think? (Elevators—5, 5.1.1, 5.1.4)
A. Fireman service is required in all elevators that serve 3 or more landings or travel 36’ or more if plans were filed after January 1, 1980.
B. In a Class E building that is 100’ or more in height, every elevator serving a floor must be equipped with Firemen Service if there are 3 or less cars serving that floor
C. In a Class E building that is 100’ or more in height, every elevator serving a floor must be equipped with Fireman Service if the total load capacity of all cars serving the floor is less than 6000 pounds
D. Where a floor is serviced by more than three elevator cars, at least three elevator cars with a total rated capacity of not less than 6,000 pounds shall be equipped for Firemen Service.

11. A

Firemen Service is required in all elevators that serve three or more landings or travel 25 feet or more if plans for the elevator were filed after January 1, 1980.

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12. An Officer discussing the Lobby Keyed Switch of Firemen service elevators was incorrect to state? (Elevators—5.2.1--A, B, C, D)
A. The Lobby Keyed Switch is required to be within 4 feet of the lobby call button
B. A Lobby Keyed Switch will exist either on the street floor for elevators that terminate on
the street floor or on the Sky Lobby level for elevators terminating above the street floor
C. The Lobby Key Switch can be operated by a FDNY 1620 key, or by a citywide standard elevator 2642 key
D. Elevator keys are removable from Lobby Keyed Switches in the Normal, Firemen Service, and Door Open positions

12. D

E. The Normal and Firemen Service position in the keyed switch permit the removal of the key. The key is not removable in the door open position.

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13. Regarding elevator car keyed switches it is correct to state that? (Elevator—5.2.2 B)
A. In an elevator car, a 1620 key is removable only in the “NORMAL” position
B. The “HOLD” position is required in all elevators installed since March, 1991
C. A firefighter with a 1620 key can move a car by changing the switch from HOLD to NORMAL
D. Firefighters shall not move an elevator car found in “HOLD” without first informing the IC or a Sector Chief

13. B

E. The Normal and Firemen Service position in the keyed switch permit the removal of the key. The key is not removable in the door open position.

NOTE: Elevators approved for installation after March 1991 are required to be equipped with a three position switch:

A firefighter with a 1620 key can move the car by changing the switch position from HOLD to FIREMAN SERVICE.
THIS ACTION SHALL NOT BE TAKEN WITHOUT FIRST INFORMING THE FIREFIGHTERS OPERATING ON THAT FLOOR.




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14. First alarm units arrive at a fire on the 24th floor of a 60-story High-Rise Office building. In regards to the recall of the elevators, it would be accurate to make which statement(s)? (Elevators—5.3.1 A, B)
A. Manual recall of elevators terminating on the street floor occurs by use of a 1620 key at the Lobby Keyed Switch on the street floor
B. Manual recall of Sky Lobby elevators can be accomplished at a 3-position keyed switch at the Fire Command Station or the 3-position keyed switch on that elevator’s terminal floor
C. Automatic recall of elevators will occur if an elevator landing smoke detector activates
D. Automatic recall of elevators will occur if there is a water flow from a sprinkler system
E. Automatic recall of elevators will occur if an HVAC detector activates

14. A, C, D

Note: For elevators whose terminals are above the street floor (sky lobby), a two position keyed switch will be at the fire command station. The switch will allow the elevators to be brought down non-stop to their lowest floor landing. A three position keyed switch will also be at their terminal floor landing.

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15. First alarm units arrive at a fire on the 28th floor of a 45-story High-Rise Office building. The Fire Safety Director informs members that Phase 1—Recall, was initiated using his elevator key. They then find all the elevator doors are closed in that bank. In this situation, in order to open the doors in this bank of elevators, the officer should use her 1620 key to place the Lobby Keyed Switch to the? (Elevators—5.3.1 A, B)
A. DOOR OPEN position
B. NORMAL position
C. NORMAL position momentarily, then place it to FIREMEN SERVICE
D. NORMAL position momentarily, then place it to DOOR OPEN

15. C

a. Determine if Phase I was initiated manually or automatically.
b. If Phase I was initiated manually the Firemen Service lobby keyed switch will be found in the Firemen Service position. Place the Firemen Service lobby keyed switch momentarily in the "Normal"
(OFF) position. Then return it to the Firemen Service position. This will cause all elevator car doors in this bank to open.
c. If Phase I was initiated automatically (by lobby smoke detectors or sprinkler water flow), place the lobby keyed switch in the "Door Open" position. The doors of the Firemen Service cars will then open. In some older installations the doors of the non- Firemen
Service cars will not open and must be opened by use of the emergency hoistway door key.

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16. Emergency Stop Buttons are? (Elevators—5.3.1 D-5, 5.3.3 E)
A. Operational only in Phase 1
B. Operational only in Phase 2
C. Operational in both Phase 1 and Phase 2
D. Non-operational in both Phase 1 and Phase 2

16. B

E. Emergency Stop Button.
1. The Emergency Stop Button is rendered inoperative during the Phase I operation.
2. The Emergency Stop Button should be operational during Phase II operation.
3. Activation of the Emergency Stop Button in Phase II will quickly stop the elevator car.

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17. In Phase II — the operational phase, members should know which one of the following points is accurate? (Elevators—5.3.2 A-2, 3, 10, 5.3.3 C)
A. As soon as the elevator car begins to move, press the Call Cancel button. The elevator car should stop immediately.
B. When you reach the selected floor, press the Door Open button, keeping your finger on this button until the door starts to open
C. The elevator car can be placed on or off of Fireman Service at any landing
D. It is recommended that the Call Cancel Button be pressed whenever a member enters a car on Firemen Service to clear the floor selection panel

17. D

2. When the Call Cancel Button is operated, the elevator car stops at the next available floor landing (i.e., the first floor, in the direction of travel, that the elevator is electrically and mechanically capable of serving). The
doors remain closed. A new floor selection must then be made.

D. Door Open Button.
1. The elevator door opens only when the Door Open Button is pressed.
2. The Door Open Button must be held until the doors are fully opened.
3. If the Door Open Button is released before the doors are fully opened, the doors return to the closed position. This feature is provided so that the release of the Door Open Button will automatically close the doors in the event the car inadvertently stops at the fire floor.
4. Members leaving the elevator car must verify that the doors are fully opened. If the member leaves the car before the doors are fully opened, the door will close behind him, isolating the car and placing it out of

10. An elevator can be placed on Firemen Service or taken off of Firemen Service only when the car is at the landing where the lobby keyed switch is located.
service.

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18. First alarm units arrive at a fire in a 42-story High-Rise Office building where there are 3 elevator banks. Bank A runs from 1-14, Bank B runs from 14-28, and Bank C runs from 28-42. There are access stairs in the building from floors 8-10, and 24-26. In the lobby you are able to determine from information at the Fire Command Station and occupants that the fire floor is the 25th floor. In this situation, you should take? (Elevators—6.1)
A. A stairway in the lobby to walk to the fire floor
B. Bank A to the 16th floor, then walk up to the fire floor
C. Bank B to the 22nd floor, then walk up to the fire floor
D. Bank B to the 23rd floor, then walk up to the fire floor

18. C

B. Select a floor at least two floors below the fire floor or two floors below the lower level of an access stair in the fire area, whichever is lowest.

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19. When operating a hose line on the floor below a fire for members that are trapped in a stalled car, the line should be operated in a fog stream with a _______ degree fog pattern? (Elevators—6.3.1--#9)
A. 30 B. 45 C. 60 D. 75

19. A

9. Hose line on the floor below can be used to spray a fog stream between the car and the hoistway door. A 30 degree fog pattern should be used to cool and protect trapped persons during the rescue operation.

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20. First alarm units arrive at a fire on the 26th floor of a 40-story HRFPMD. The 1st Arriving LCC of Ladder 59 is attempting to reach the roof of this building. In this situation, he should know which point(s) to be correct? (More than one correct) (TB Elevators—6.4.4)
A. Never take an elevator that serves all floors to go above a fire unless that elevator has Firemen Service
B. If there is an elevator with a blind shaft on the fire floor, that elevator may be used to go above the fire
C. A fire tower may be used to go above the fire
D. Attack stairs may be used to go above the fire
E. Evacuation stairs may be used to go above the fire

20. B, C, E

6.4.4 Members shall never take a Firemen Service elevator which services all floors to go above the fire. When assigned to go above the fire via an elevator, choose an elevator which has a blind shaft on the fire floor. Remember a "Firemen Service" elevator is not necessarily a "safe" elevator. It can still be affected by heat, smoke or water entering the shaft. If there is no blind shaft elevator to go above the fire, stairs shall be used.

Note: Use a fire tower or a stairway other than the attack stair.

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21. An Engine company is taking an elevator up to the 11th floor of a 46-story High Rise FPMD for a heavy fire condition in apartment 13J on the 13th floor. On arrival at the 11th floor, the elevator car opens, but the hoistway door is locked. In this situation, the Officer would be correct to think that? (Elevators 6.5.1)
A. This lock is not required to be openable with an FDNY 1620 key
B. If the lock can be removed or opened with only minor damage to the door, do so
C. Attempt to remove the lock even if some bending or warping could occur
D. The preferred tactic in this situation is to drop down to a floor where exit is possible

21. D

1. If the hoistway door security lock can be removed or opened with no damage to the door, do so.

2. If removal of the locking device threatens any bending or warping of the door or door buck, make no attempt at removal. Warping or springing of the door assembly may interfere with the car's electrical circuits, putting the car out of service.

Note: In high rise buildings, on the street floor and above, any locks placed on passenger elevator car or hoistway doors must be openable with a 1620 key.

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22. In a single car blind hoistway, emergency access openings shall be provided at every ______ floor, but not more than ______ feet apart. (Elevators — 7.3.2)
A. 2nd, 24 B. 3rd, 36 C. 4th, 48 D. 5th, 60

22. B

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23. Elevator Car Door Zone Locks are found on NYC Housing Authority elevator cars. Regarding these locks, it would be incorrect to state that the Zone Lock? (Elevators — Add 8)
A. Prevents the elevator car door from opening if the car does not stop level with the floor
B. Is installed on the outside of the elevator car door on hinged and sliding type doors
C. Will be visible on the front side of the elevator car towards the top of the door
D. Is disengaged on hinged doors by lifting a rod straight up, and disengaged on sliding doors by depressing a lever

23. D

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1. The term LP is used for Liquefied Petroleum Gases that are stored as a liquid under pressure, but vaporize into a gas when the pressure is released. Regarding these LP gases it would be incorrect to state that they are? (HM 1—1.2)
A. Flammable
B. Heavier than air (2 to 2.5 times heavier)
C. Odorless
D. Similar to a highly volatile flammable liquid, but with more rapid vaporization when the LP gas is in a liquid state

1. B

1.2.5 LP gases are heavier then air (1.5 to 2 times heavier).

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2. First alarm units arrive at the scene of a LP Gas fire in a tank truck on an express highway. Regarding the basic precautions during initial operations it would be correct to state that? (HM 1—1.3.1-1.3.3, 1.4.1)
A. When approaching the fire from the upwind side, the engine officer ordered the nozzle firefighter to keep the nozzle low and aim it downward to disperse gases or flaming vapors
B. Ladder Company members immediately evacuated areas in the vapor cloud and in the path of the vapor cloud
C. The Chief ordered members not operating to remain at least 500 feet from the front and rear of the tank and at least 1000 feet from the sides
D. Never extinguish the fire until the leak has been stopped
E. If a frost line is seen on the tank, apply water to the area below the frost line

2. B

1.3.1 Whenever possible, approach the fire or leak from upwind. Keep nozzle low and aim it upward to disperse gases or flaming vapors. Use multiple lines where
necessary.

1.3.3 Keep everyone, not actually engaged in operations, at least 1000 feet from the front and rear of the tank and 500 feet from the sides.

1.4.1 Do not extinguish the fire until the leak has been stopped, except under extremely unusual conditions.

1.4.7 Tank failure under fire conditions usually occurs in the vapor area of the tank when sufficient water cannot be applied to prevent the metal from softening or weakening to a point where metal failure occurs.

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3. Battalion Chief arrives at a fire in a rear yard of a commercial business where an outside LPG tank is being exposed to high heat from a garage fire. In this situation, which tactic would be correct for him to consider? (HM 1—1.4.3, 1.4.5, 1.4.7, 1.4.8, 1.4.9)
A. The LP gas tank exposed to the serious fire can be moved to a safe location by moving it in a position horizontal with the ground
B. If LP gas is on fire and the flow of gas cannot be shut, immediately extinguish the gas fire
C. Large quantities of water should be applied to the tank surface, particularly on the liquid area of the tank
D. A bubble or blister forming on the tank shell should cause members to be withdrawn

3. D

1.4.5 Where escaping gas is on fire and the flow cannot be shut off, application of large quantities of water on the tank and piping will permit controlled burning, allowing the fire to consume the contents of the tank without the danger of tank or pipe failure. Make certain that fire is NOT extinguished.

1.4.7 Tank failure under fire conditions usually occurs in the vapor area of the tank when sufficient water cannot be applied to prevent the metal from softening or weakening to a point where metal failure occurs.

1.4.9 Ordinarily no attempt should be made to move a tank involved in a fire. Usually little would be gained in reducing the hazard. However if specific conditions
develop that make it desirable to move the tank, it should be moved in an upright position. Never drag it in a manner that might further damage valves or piping.
Any attempt to turn the tank upright, to remove it to some remote location or to facilitate product withdrawal, should be done carefully to avoid damage to valves and piping, Portable LP gas cylinders that are exposed to a serious fire should be removed to a safe location.

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4. Units arrive on the scene of a LP gas leak with no fire, where LP gas vapors are dispersing in the area. In this situation, they would be correct to disperse the vapors by using a? (HM—1.5.2)
A. Straight stream from the rear of the vapor path
B. Water spray from the rear of the vapor path
C. Straight stream across the vapor path
D. Water spray across the vapor path

4. D

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5. LPG is indicated on a diamond shaped placard which displays what 4-digit number and what single digit DOT Hazardous-Material Class pictured below? (HM-1—Pg 9—Figure 17)

A. 1075
2
B. 1075
3
C. 1971
2
D. 1971
3

5. A

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6. An officer discussing the possibility of a BLEVE with LPG would be correct to state that? (HM-1—2.4)
A. LP gas is stored in cylinders just below its boiling point
B. One cubic foot of LPG as a liquid will expand 170 times as a gas
C. An impact failure of a cylinder in an accident can cause a BLEVE
D. Satisfactory performance of a relief valve will generally prevent a BLEVE

6. C

2.4.1 Propane is a liquefied gas stored in cylinders at a temperature above its boiling point and remains under pressure and in liquid form only so long as the container remains closed to the atmosphere.
2.4.2 Heat applied to the cylinder will cause excessive pressure to build up in the cylinder opening the relief valve. One cubic foot of liquid will expand 270 times
as a gas.
2.4.3 There is a great possibility that a cylinder involved in a fire will "BLEVE" (Boiling Liquid Expanding Vapor Explosion). A BLEVE can occur in a matter of
minutes. A satisfactory performance of a relief valve can not prevent a BLEVE.

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6. First alarm units arrive at the scene of a car accident where one of the vehicles is dual-fueled, utilizing both gasoline and LP gas. Because the vehicle has a propane leak, they would be incorrect to think that? (HM-1—2.5.1—A, B, C, 2.6.2 C)
A. They should evacuate downwind and in low areas like cellars, evacuating first where the life hazard is greatest
B. A combustible gas detector should be utilized
C. When shutting the LP gas tank, they should turn the valve counter-clockwise
D. Fog streams should be used to channel any vapors

6. C


The fuel shutoff valve can be turned off by turning it
CLOCKWISE.