Pump Ops Chpt 10 Flashcards
Making the pump operational referred to as “_________” begins after the apparatus is properly positioned and the parking brake has been set
Putting the pump into gear
Typically the least desirable hydrants are those located on “_________” that are served by smaller mains from only one direction.
Dead end mains
A _________ consists of stopping at the hydrant, dropping the end if one or more supply hose lines at the hydrant, and then proceeding to the fire location
Forward hose lay
Some deportments use a __________ to aid the process of making a forward lay. This valve allows the original supply line that was laid by the first pumper to be immediately charged using hydrant pressure
Four-hydrant valve
This allows the second arriving pumper, located at the hydrant, to be connected without interrupting the flow of water to the original supply line. The second pumper is then able to boost the pressure to the supply line using a second intake connection on the valve.
Four way hydrant valve
With the ________, hose is laid from the fire to the water source
Reverse lay
Load the hose with the make coupling to come out of the bed first when using hose with threaded couplings for a
Reverse lay
A common two pumper operation provides for an attack pumper and a war supply pumper. The _______ reports directly to the incident scene to begin initial operations using water from it’s onboard water tank. The ________ lays a supply line front he attack pumper back to the water source.
First pumper (attack pumper)
Second (water supply)
When the pump is full of water and the pressure in the system has the stabilized with no water flowing, a reading on the master intake gauge indicates the ________ in the water supply system.
Static pressure
Pumps supplying a relay operation or master stream are usually used to supply large amounts of water, requiring the use of the _______ setting of the transfer valve
Parallel volume
When a pumper is connected to a hydrant and is not discharging water, the pressure shown on the intake gauge is ___________.
Static pressure
When the pumper is discharging water, the intake gauge displays the _______.
Residual pressure
When using the _______, the driver /operator must note the static pressure of the water system before any pump discharges are open or know the usual static pressure in the water supply system under normal circumstances.
Square-lines-method
However, it is possible to evacuate some of the air inside the pump creating a _______, which allows atmospheric pressure acting on the surface of the water to force the water into the fire pump.
Pressure differential (partial vacuum)
The amount of _______ in the intake hose depends on the diameter and the length of the hose as well as the intake strainer and any adapter use.
Friction loss
With the pump moving water, the vacuum reading on the master intake gauge will provide an indication of the remaining capacity if the pump. Most pumps are able to develop a vacuum capacity of approximately _______ of mercury
22 inches
In theory,________ can be described as water being discharged faster than it is coming into the pump. This condition occurs when air cavities are created in the pump or bubbles pass through the pump.
Cavitation
In order for a pumper to approach it’s rated capacity using a traditional strainer, there must be at least _______ of water over the strainer
24 inches
These strainers are designed to sit directly on the bottom of a tank or pool and allow water to be effectively drafted down to a depth of approximately 2inches
2 inches low level strainers
Each time _______ is pumped through the apparatus, the pump and piping should be thoroughly flushed with fresh water soon afterwards.
Non potable water
All fire pumps meeting NFPA and underwriters laboratories inc. requirements are rated to pump their capacity at ______ of lift.
10 feet
A pumper. In good working order can lift water a maximum of _____.
25 feet
To create an effective fire stream, a lift no greater than ______ is recommended. Working with this lift, the pump operates at about 60 percent of its rated capacity.
20 feet
When the pump has been made operational, priming the pump will begin the operation. For two stage pumps, the transfer valve must be in the ___________. A pump in series pressure position may trap air that will need to be removed.
Parallel volume position
Most priming pumps are intended to work most effectively when the engine is set at rate between ______ and _____.
1000 and 1200 rpm
While the pump is operating, gradual increase in the vacuum may be noted with no change in the flow rate. This is an indication that a ______ is developing
Blockage
The installation of all occupancies with ______ should be identified in preincedent planning.
Automatic sprinkler systems
If a sprinkler system is to be supplied at the FDC, the driver/operator should slowly develop the amount of pressure required to supply the system, after the need to supply the system has been confirmed. Multi stage pumps should be operated in ________.
Parallel volume position
Allow for quicker access to water supply for attack hose lines in multi floor or single buildings with large floor areas.
Standpipe systems
Add approximately _____ for each floor above the fire department connection that will have operating fire streams
5 psi
When a standpipe system is known to be equipped with _____, the elevation pressure used must be based on the total height of the standpipe or zone being used.
Pressure reducing valves
Driver operators should maintain a residual pressure of at least ____ on their master intake gauges at all times during pumping operations.
20 psi
The ____ is the most direct method of supplementing hydrant pressure or performing drafting operations
Reverse lay
To use the percentage method, first calculate the drop in pressure as a
Percentage
The _____ is a quick and easy way to calculate available water using psi and gpm
First digit method
The ability to overcome losses in pressure is limited to atmospheric pressure at sea level 14.7psi. The inches of mercury measurement is used in drafting since the changes in pressure are so minute. This pressure decreases approximately _____ for each 1000 ft of altitude gain.
0.5 psi
Although cavitation can occur when operating from a hydrant system, it often occurs during
Drafting operations
The first consideration in establishing a drafting operation is
Site selection
If the draft is being established to supply water tenders for a shuttle operation, there may be several options. A site may be selected by:
Amount of water
Type or quality of water
Accessibility of water
The most important factor in choosing the draft site is the
Amount of water available
When using a portable tank or swimming pool for drafting operations, a _______ is the appliance of choice
Low level strainer
Accessibility to a water source is an important factor in selecting a
Drafting site
If the apparatus features a ______, the engine rpm should be kept as low as possible without causing the engine to stall.
Vacuum type primer
The most common inability to prime is an ______ that prevents the primer from developing enough vacuum to successfully draft water
Air leak
The most common cause for an air leak is an
Open drain
The most common place for blockage to occur is in the
Strainer
Several types of problems may occur during drafting operations. They all fall into the following general categories
Air leak on the intake side of the pump
Whirlpool allowing air to enter the pump
Air leakage due to defective pump packing
Many manual standpipe systems are designed to be pumped at a pressure of ____ at the FDC
150 psi
