Chpt 13 Flashcards
A ____ can be one of the most complex of these options because it requires at last two pumpers and sometimes multiple pumpers, to form a relay
Relay pumping operation
To establish any type of relay, you must have a minimum of
Two fire pumpers, hoselines, and personnel
One fire pumper is located at a water source; it is called the
Source pumper
The other fire pumper is positioned at the fire scene; it is called the
Attack pumper
Any other fire pumpers that are between these two fire apparatus and are positioned to maintain flow pressure in the relay are called
Relay pumpers
The _____ is the most important pumper in the relay because it is located at a water source and supplies the water to the entire incident
Source pumper
The source pumper should consist of the _______ fire pump of the units assigned to the relay operation, thereby ensuring that it can provide the maximum amount of water
Largest fire pump
Is usually the first unit on the scene of an incident, and it’s operation will dictate how much water will be needed based on how many gpms the fire attack requires
Attack pumper
If the _____ is being positioned in an area that has limited access, it is generally recommended that a supply line be laid down from an open area to a limited access point
Attack pumper
Ultimately the _____ serves as the workhorse at the incident; it provides water to all of the hoselines that are attacking the fire
Attack pumper
Are the fire apparatus that are placed in the middle of the relay pumping operation
Relay pumpers .
Is the primary path of travel for the water to get from one pumper to another in a relay operation
Fire hose
In addition, no matter which size hose you are using to supply water from the source pumper, each pumper in the relay operation and the attack pumper be equipped with an
Intake relief valve
An ____ will prevent the incoming water supply from reaching an excessively high pressure, which might damage the pump and possibly interrupt the relay operation
Intake relief valve
The length of a relay pumping operation is primarily determined by the distance between the _______
Water source and the incident
Generally, _____ represents the best option for relay pumping operations
LDH
a ____ is a supply hoseline that is brought to the scene by a fire pumper from the water source
Forward lay
Hose can also be laid backward from the attack pumper to a water source or to another fire pumper in the relay line; both are examples of
Reverse lay
One fire pumper may lay hose into the scene while another fire pumper lays hose out from the first engines couplings to the water source this approach is called a
Split lay
Although a good rule of thumb is that no relay operation should extend for more than _______, it can be longer as long as you keep adding pumpers
800 ft
When two fire pumpers use different threads on their couplings for hose, _____ allow for both pumpers to connect to the same hose
Adapters
When the sizes of different hose lines differ _____ are needed to connect the mismatched lines
Reducers
An ____ is any other component that you can flow water through
Appliance
One type of relay pumping operation is called a
Calculated flow relay
This type of relay is the most common as it uses actual ____ to determine the quantity of water required
Flow calculations
The relay pumping operation starts at the source pumper and is where the _______ fire pump should be located
Largest
The ______ is generally the first pumping apparatus to arrive on the scene of the fire
Attack pumper
A ____ is considered ready when the supply hose to the pumper and the discharge hose to the next pumper are connected
Relay pumper
As the driver operator of a relay pumper, you must monitor the incoming residual pressure from either the source pumper or another relay pumper; your goal is to maintain
20 psi of residual pressure
Many fire departments that regularly use relay pumping operations because of issues related to limited water supply will use a ___in long hose lays
Relay valve
A ___ lets you hook up into the relay without shutting down the entire operation
Relay valve
In this process, water is pumped from a water source through hose under pressure to the apparatus engaged in fire suppression efforts.
Relay pumping operations
Can be as simple as one fire pumper at a pond or lake and the other fire pumper at the fire scene, or as complex as the use of multiple pumpers to supply water over a long distance to the fire operation
Relay pumping operations
Greatly increase the effectiveness of relays by allowing one LDH to supply two to four medium size lines with water
Manifolds
It requires the driver operator of the source pumper to obtain from the attack pumper the flow required for the fire operations; the driver must then calculate the friction loss for each hose layout in the relay and add 20 psi for the residual pressure at the attack pumper.
Calculated flow relay
The pumper driver operator in this type of relay sets the pump discharge pressure to 175 or 80 psi depending on the size of the supply line, and maintains this pressure for the duration of the relay pumping operation
Constant pressure relays
Most fire pumpers have 500 to 1000 gal water tanks, which allow them to supply the two 1 3/4 in hoselines for ______ before running out of water.
2 1/2 to 5 minutes
Pumpers are generally added to an existing relay pumping operation when there is not enough ______ to meet the demands of the attack pumper
Pressure or flow
Depending on the nature of the relay pumping operation, the last pumper in the series may supply two attack pumpers. If this is the case, then the last pumper may use a ________ that is, one LDH that is split into four or five medium size hoselines that provide water supply for multiple attack pumpers
Manifold
