Flashcards in Chapter 11 Operating Fire Pumps Deck (70):
The process of making the fire pump operational may also be called:
putting the pump into gear.
The process for making the fire pump operational begins:
after the apparatus has been properly positioned and the parking brake has been set.
On the majority of apparatus, the procedure for making the pump operational takes place:
before the driver/operator exits the cab.
Except when the apparatus is used for pump-and-roll operations, what is the next step after the driver/operator exits the cab?
Chock the apparatus wheels.
When does IFSTA recommend that the apparatus wheels be chocked?
Every time the apparatus is stopped with the engine running and the driver/operator exits the cab
What are the two basic pressurized water supply sources used to supply a fire pump?
A hydrant and a supply hose from another fire pump
Negative pump pressure is also called:
When operating at negative pump pressure, as the volume from the fire pump increases, the incoming pressure from the supply source may:
Which of the following is a danger of operating at negative pressure from a fire hydrant?
A. Increases the possibility of damage to the source pumper due to cavitation*
B. May make it necessary to make a later transition to a static supply source
C. Can cause water to enter the pump with too much pressure from the source
D. Can cause supply hose to collapse, resulting in interruption of water supply
Which of the following is a danger of operating at negative pressure from another pumper?
Can cause supply hose to collapse, resulting in interruption of water supply
The best hydrants are located:
on large water mains that are interconnected in a grid pattern.
The worst hydrants typically are those located:
on dead-end mains.
Which of the following commonly become clogged with sediment and encrustation, further reducing their capacity?
A. Dead-end mains
B. Open-ended mains
C. Single mains that supply small amounts of water*
D. Large water mains that are interconnected in a grid pattern
Which of the following is NOT a way in which reliability of hydrants can be found?
A. Fire departments should have access to water department records.
B. Apparatus may be equipped with map books with hydrant information and locations.
C. Fire hydrants may be color coded to indicate the flow that can be expected from them.
D. A pumper should be hooked up as quickly as possible to test the flow rate of each hydrant.*
Once a hydrant has been selected, the pumper should be hooked to it as quickly as possible, using either:
a forward or a reverse lay.
One possible problem with a forward lay depends on:
the distance from the hydrant to the fire and the length of the hose carried on the engine.
Many departments that prefer forward lays use a(n):
four-way hydrant valve.
On dry-barrel hydrants, it is recommended that ___ be attached to the unused hydrant discharges.
When using 2½- or 3-inch (65 mm or 77 mm) hoselines to supply the pumper directly off hydrant pressure, it is recommended that the lines be no longer than:
300 feet (90 m).
A reverse lay is used so that ___ can be made before laying a supply line.
If threaded couplings are used, hose beds set up for reverse lays should be loaded so that the first coupling to come off is:
The reverse lay has become a standard method for setting up a ___ operation when using smaller diameter hose as a supply line.
A disadvantage of the reverse lay is that:
essential fire fighting equipment must be removed and placed at the fire location before the pumper can proceed to the water source.
Do not engage the pump drive system ___ if there will be an extended period of time where water is introduced into the pump.
before leaving the cab
If operating a two-stage pump, set the ___ valve to the proper position before increasing the throttle to build discharge pressure.
Open discharge valves:
In most cases, the static water supply will be located:
at a lower level than the fire pump.
In order to pump from a lower level, ___ must be created by evacuating some of the air inside the fire pump.
a partial vacuum
To force water into the pump, ___ is needed between the fire pump and the body of water to be used.
hard intake hose
The amount of friction loss in the intake hose depends upon the:
diameter and length of the hose.
The total pressure available to overcome all these pressure losses is limited to the atmospheric pressure at sea level (___ psi [kPa]).
14.7 psi (100 kPa)
Atmospheric pressure decreases ___ psi (kPa) for each 1,000 feet (305 m) of elevation gain.
0.5 psi (3.5 kPa)
Because the same amount of atmospheric pressure must overcome elevation pressure as well as friction loss, increasing the height of the lift also decreases:
total pump capacity.
While the pump is moving water, the vacuum reading on the ___ provides an indication of the remaining pump capacity.
master intake gauge
The maximum amount of vacuum that most pumps develop is approximately ___ inches (mm) of mercury.
22 inches (560 mm)
What happens when an attempt is made to increase the discharge from the pump beyond the point of maximum vacuum on the intake?
The most important factor in the choice of the draft site is the ___ of water available.
In order for a pumper to approach its rated capacity using a traditional strainer, there should be a minimum of ___ of water above the strainer.
2 feet (0.6 m)
It is also desirable to have ___ of water all around the strainer.
2 feet (0.6 m)
If there is not an adequate amount of water above the strainer, the rapid movement of the water into the intake strainer creates:
The best solution in drafting from a swiftly moving shallow stream is a ___ strainer.
Low-level strainers are designed to sit directly on the bottom of the tank or pool and are capable of allowing water to be drafted down to a depth of about:
2 inches (50 mm).
Water that is below ___ or above ___ may adversely impact the pump's ability to reach capacity.
35ºF (2ºC); 90ºF (32ºC)
Pumping ___ water can be harmful to the pump.
The most common type of contamination, and possibly the most damaging, is ___ water.
dirty or sandy
All fire pumps meeting NFPA and UL requirements are rated to pump their capacity at ___ of lift.
10 feet (3 m)
Once the desired drafting position has been chosen, the driver/operator should move the apparatus:
toward the drafting site.
If the apparatus is not able to park directly at the drafting location:
firefighters will have to carry the hose and strainer and put them into the desired position.
Before connecting sections of hard intake hose, check the ___ to make sure that they are in place and that no dirt or gravel has accumulated inside the ___.
If a barrel strainer is used, the rope that was tied to it can be used to suspend the strainer above the bottom by tying it to:
A. a tree.
B. the pumper.
C. another fixed object.
D. all of the above.*
If a barrel strainer is used and the bottom slopes away from the edge, it may be possible to put a ___ in the water and rest the intake hose on it.
Priming the pump starts:
the draft operation.
If operating a two-stage pump, the transfer valve should be in the ___ position during priming.
Before priming, make sure that all drains and valves are:
Most priming pumps are intended to work best when the engine is set between:
1,000 and 1,200 rpm.
The vacuum reading on the master intake gauge should read ___ inches (mm) for each ___ feet (m) of lift.
1 inch (25 mm); 1 foot (0.3 m)
The entire priming action typically requires ___ seconds from start to finish.
10 to 15
When using no more than 20 feet (6 m) of hard intake hose lifting a maximum of 10 vertical feet (3 m), the priming process should not take more than:
After the pump has been primed, the pressure needs to be between:
50 and 100 psi (350 kPa and 700 kPa).
The water supply for sprinkler systems is designed to supply ___ of the total number of sprinklers on the system.
only a fraction
Sprinklered FDCs consist of a ___ or one large diameter sexless connection that is connected to a clappered inlet.
siamese with at least two 2½-inch (65 mm) female connections
If there is any indication of an actual fire, a minimum of ___ should be connected to the FDC.
Two 2½-inch (65 mm) hoselines
It is a general rule of thumb that one ___ gpm (L/min) rated pumper should supply the FDC for every ___ sprinklers that are estimated to be flowing.
1,000 gpm (4 000 L/min); 50
If recommended discharge pressure is not on the FDC plate or in the pre-incident planning information, the general rule of thumb is to discharge ___ into the FDC.
150 psi (1 050 kPa)
For what type of structure are standpipes commonly used to speed fire attack?
Multistory or single-story buildings with large floor areas
Generally, what lines should be used to support standpipe systems?
Fire department attack lines
How are dry pipe systems supplied with water?
A pumper that attaches to a standpipe FDC outside the building
Add approximately ___ psi (kPa) to the desired nozzle pressure for each floor above the standpipe connection that will have operating fire streams.
5 psi (35 kPa)
When a standpipe system is known to be equipped with pressure-reducing valves, the elevation pressure used must be based on:
the total height of the standpipe.