Chapter 10 Flashcards by bobby mckenzie

The driver operator must first made the pump operational and then prepare to use?

At least one of the three sources of water to supply the pumping operation (335)

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When making a fire pump operational begins?

After the Apparatus is properly position and the parking brake has been set

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how to prevent pump from over heating

circulator bypass or booster cooling valve to recirculate water back in the tank (337-38)

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During drafting operations, the amount of friction loss is____to the amount of water moving through the hose or appliance

Proportional

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pumping at a low residual pressure while being supplied by another apparatus is____ dangerous. This may cause the ____ to____,interrupting the supply of water. it may also lead to______of the pump

equally/hose /collapse,/cavitation

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Transfer valve must be in parallel (volume)position when priming:(358)

Two-stage pumps

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A pump in series (pressure) position may(358)

Trap air that will need to be removed

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To create an effective fire stream during drafting operations,a lift of no greater than____ is recommended

20 feet for 60% capacity of the pump

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As air is evacuated from the pump the compound gauge on the intake will register a vacuum reading

1 inch of mercury for 1 foot of lift required

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Priming typically take 10 to 15 seconds but not to exceed

30 seconds (45 seconds in pump larger than 1250 GPM)

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Vacuum is measured from the surface of the water

To the eye of the pump’s impeller

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When opening the discharge (using a draft)if the pressure dropped below____pause a moment to allow it to stabilize before opening it further

50psi

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Water temperature below 35°F or above 90°F may adversely impact The ability of the pump to reach (356)

Capacity

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Driver engineer should maintain the residual pressure of at least ____ on their master gauge intake during pumping operation (340)

20 PSI

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When using 2 1/2 or 3 inch to supply the pumper off the hydrant the lines should be(344)

Kept as short as possible to avoid excess friction loss

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When pumping in relay the supplying pumper should supply

20 psi plus friction loss and engine pressure should not exceed 250 psi

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If a circular tank is 12 feet in diameter 15 feet high is 3/4 full and water is being removed from the tank at a rate of 500 GPM, approximately how many minutes will it takes before the tank is empty

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Class AA hydrant

Light blue at 1500 gallons per minute

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Class A hydrant

Green at 1000 to 1499 gallons per minute

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Class B hydrant

Orange at 500 to 999 gallons per minute

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Class C hydrant

Red at less than 500 gallons per minute

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The water supply from an onboard water tank is(336)

The sole source of supply for many incidents

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The two basic pressurized water supply sources are a fire hydrant and(339)

Supply hose from another pumper.

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In order to partially open the tank fill valve and not create the potential for pump cavitation, some driver open the valve the distance of their thump to the pump panel with their hand on the valve control.(338)

True.

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As the discharge volume from the fire pump increases,(339)

the incoming pressure from the supply source may drop due to friction lost in the water system

If discharge flow volume is increased too much when operating from a pressurized water source(339)

Intake pressure from the supply source may be reduced to a point that may damage the pump

During pumping operations, driver/operators should maintain a residual pressure on the master intake gauge: (340)

Of at least 20psi

Hydrants served by large mains that are in the interconnected in a grid pattern receive their supply(340)

From several directions and usually have lesser amount of segmentation and deterioration

The least desirable hydrant are those located on(340)

"Dead end mains"that are served by smaller mains from only one direction.

Dead end mains hydrants generally have(340)

Higher amounts of sediments and deterioration,which further reduce their capacity

A pumper may need to be placed at the hydrant to make use of all available pressure

In a long lay with large flow demands

Which of the following is the purpose of a four-way hydrant valve in making a lay? (341)

Allows a second arriving pumper to be connected without interrupting the flow of water to the original supply line

Which of the following consists of laying hose from the fire to the water source? (344)

Reverse lay

Which of the following would be used when the driver/operator first reports to an incident location in order to size up the scene before laying a supply line? (344)

Reverse lay

executing a reverse lay is a common method for setting up water supply operation relay pumping operation using ______as a supply line(344)

medium diameter hose

the reverse lay is the most direct method of supplementing____ ____ or performing_____ _____(344)

hydrant pressure/drafting operation

When a pumper is connected to hydrant and not discharging water, the pressure show on the intake gauge is

static pressure

the driver should close the tank to pump valve after transition to

an external water supply

When the pump is discharging water, the intake gauge display the

Residual pressure

The difference between the static pressure and a residual pressure

Determine how much more water the hydrant can supply

The amount of friction loss in the intake hose depends on

The diameter and length of the hose as well as the intake strainer and any adapters in use

During drafting operations,the ability to overcome losses in pressure is

Limited to atmospheric pressure at sea level

With the pump moving water, the vacuum reading on the master intake gauge will provide an indication of

The remaining capacity of the pump

Most pumps are able to develop a vacuum capacity of approximately

22" of mercury

During cavitation, the pressure drops below atmospheric and

The boiling point of water drops to the point that the water changes to a vapor and creates a void composed of water vapor,steam

The temperature of the water, the height of the lift,and the amount of water to be discharged.

Affect the point at which cavitation begins

What are some indication that pump is cavitating

1•The pressure gauge on the pump well fluctuate and hose streams may pulsate creating a distinctive sound as the water leaves the nozzle. 2• (severe case)noise from the pump sounding gravel passing through the pump 3• (surest indication) lack of reaction on the pressure gauge to increases in the throttle

Water temperature will also affect drafting operations

True

Water below _____ or___may adversely impact the ability of the pump to reach capacity

35°F or above 90°F

All fire pumps meeting NFPA and underwriter's Laboratories Inc. requirements are rated to pump

The capacity at 10' of lift

if the lift is less

the capacity of the pump is higher

If the lift is greater

The capacity city decreases

Pressure differential

A pumper in good working order I can lift water and a maximum of

25'

To create an effective fire stream

A lift of no greater than 20' is recommended. With the pump operating at about 60% of it rated capacity

When priming the pump and beginning drafting operations, a two- stage pump: (358)

must have the transfer valve in the parallel (volume) position.

Most priming pumps are intended to work most effectively when the engine is set at

A rate between 1000-1200 rpm

If an Apparatus features a vacuum-primer, the engine RPM should be kept

As low as possible without causing the engine to stall

As the air is evaluated from the pump the master intake gauge will register

vacuum reading (should equal 1" of mercury for 1' of lift required)

Vacuum is measured from the surface of the water

To the eye of the pump's impeller

the most common cause of an inability to prime? (359)

An air leak that prevents primer from developing enough vacuum to successfully draft water

The most common cause of an air leak is

Open drain or valve

The entire priming action typically requires 10-15 seconds. However,when up to 20 feet of intake hose lifting a maximum of 10 vertical feet,

It may take as long as 30 seconds (45 seconds in pumps larger than 1250 gpm)

After successfully priming the pump, the throttle setting should:

slowly be increased before attempting to open any discharges.

Open the desire discharge valve slowly while observing the discharge pressure

True

If the pressure drops below 50 psi

Pause for a brief time to allow it to stabilize before opening the valve further

Opening the valve too quickly may cause

Air to enter the pump causing a loss of prime

The driver/operator should not attempt to set the discharge pressure to the desire value

Until water is flowing and the gauge is stabilized

Once the desired pressure has been established and the hoselines are in service

Set the relief valve or pressure governor

The most common source of problem while operating at draft

Air leak on the intake side of the pump

If the discharge pressure gauge begins to fluctuate with corresponding loss of vacuum on the intake gauge,

Air is most likely coming into the pump along with the water. (Couplings should be re-check for tightness)

If there is not enough water above the drafting strainer

A Whirlpool may be allowing air to enter the pump.

If the onboard tank is empty

The tank to pump line may be a source of leakage

While the pump is operating, a gradual increase in the vacuum maybe noted with no change in the flow rates

This is an indication that a blockage is developing

After a pump has been operating at high rate of discharge

A blockage often occurs

The most common place for a blockage to occur is

In the strainer

Blockage may also occur against the strainer located at the intake of the pump

In this case, the pumping in operations must be discontinued while the intake hose is removed to access and clear the strainer

After the pump has been drained and the connections removed

Operate the positive displacement primer for several second until primer oil or fluid comes out of the discharge from the priming pump

When shutting down the drafting operation, why should the positive displacement primer be operated for several seconds until primer oil or fluid comes out of discharge from the priming pump

Aids in lubrication of priming pump

The automatic water supply for sprinkler system is designed to supply only

A fraction number of the total fire sprinklers at any given time

fire department connection may consist of a Siamese with at least

Two 2 1/2 inch female connections connected to a clapper Inlet, or one larger diameter sexless connection

Wet standpipe system that contain water on the pressure

May be used as soon as the hose line is stretched and the valve opened

Generally friction loss in the standpipe is small unless the flow is very large

True

Do not use pump discharge pressure in excess of 185 psi

Unless the standpipe system, hoses,and appliances has been designed to function under high-pressure

For each floor above the fire department connections that will have operating fire streams

Add approximately 5 psi

When a standpipe system is known to be equipped with pressure reducing valve

The elevation pressure used must be based on the total height of the standpipe or zone being used

When a dry standpipe system is charged, water will be discharged: (365)

at all points where caps are off and valve is open

the most likely scenario if a supply line that was charged suddenly loses water

The supply line has burst

The most likely scenario if a supply line loses water but the supply line is intact

The hydrant or water main has failed

All pumps meeting NFPA and Underwriters Laboratories Inc. requirements are rated to pump their capacity at

10 feet of lift

If the lift is _____, the _____, of the pump is highter; if the lift is _____, the capacity _____.

less, capacity, greater, decreases

Pumper in good working order can lift water a maximum of _____. However,all available atmospheric pressure is required to overcome this lift. Making the remaining ______of the pump of little value for fire suppression

25 feet,capacity

To create an effective fire stream during drafting operations,a lift of no greater than____ is recommended

20 feet for 60% capacity of the pump

As air is evacuated from the pump the compound gauge on the intake will register a vacuum reading

1 inch of mercury for 1 foot of lift required

The ability to overcome losses in pressure is limited to atmospheric pressure at _____. This pressure decreases approximately _____ or 1 inch of Hg for each _____ of alitude gain.

sea level (14,7 psi) 0.5 psi, 1,000 feet