41 Questions
What is the main benefit of placing the supply pumper as close to the positive source (hydrant) as possible?
Maximizing pressure and minimizing friction loss
What is the operation called when the supply pumper and attack pumper are set up in series?
Tandem pumping
How does placing the supply pumper closer to the hydrant benefit the attack pumper?
Increases the volume of water available to the attack pumper
What does pumping in series allow the supply pump operator to do for the attack pump operator?
Assist by increasing discharge pressure
Why is the relationship of increasing pressure to increasing available volume considered not unlimited?
As a result of diminishing returns in pressure increase
What can the supply pumper do if the attack pumper tries to flow more water than is available to it?
Increase its discharge pressure
What is the advantage of running a two-stage pump in volume mode for fires not involving a high rise?
Decreased need to transfer modes during active firefighting operations
How does running the pump in volume mode benefit the pump operator?
Reduces the training and discipline needed to operate the pump
What is one of the disadvantages of running a two-stage pump in pressure mode?
Increased complexity of pump operation
Why is it important to eliminate the need for changing pump modes during active firefighting operations?
Allows the pump operator to focus on the task at hand
In a series supply operation, what does it mean if the supply engine is still showing pressure on their intake gauge?
Additional supply line is needed
What is the purpose of using a second supply line to connect two engines together?
To maximize the water source
What is established when a supply pumper is set up near the hydrant and is pumping to the attack engine?
Built-in safety if the attack pump fails
What does series supply allow pump operators to do?
Maximize the amount of water possible
What should the attack pump operator do as the supply pump operator increases the pressure they are sending through the supply lines?
Check their discharge pressure gauge
What does establishing a series supply provide in case of an attack pumper failure?
Flow to the attack lines
What priorities should the driver remember when functioning in a series supply operation?
Get water for the crew first, then for themselves, then for everyone else
What is the reason for the Columbus Fire Department to begin purchasing all new engines with two-stage fire pumps?
To meet the increased pressure requirements necessary for pumping water to the upper floors of high-rise buildings
What led to the shift from using two-stage fire pumps to single-stage pumps in the fire service?
The shift to diesel powered engines in the fire service
What is the function of the impeller in a fire pump?
To draw water into the pump and create pressure
Why is it important for the attack driver to not charge the backup line on tank water alone?
To ensure that the limited tank water is going to the interior crews
What should a supply driver do to spot the hydrant properly?
Position the engine one car width away from the curb on the side to connect the hydrant
Why is it important for a supply driver to continually evaluate their discharge pressure?
To maintain a steady flow of water to the attack operator
What does sending the attack engine 80-100 PSI initially indicate?
It may initially be at a static pressure (no flow)
What is needed for Pump Boss engines to maintain the desired discharge pressure?
$Throttling$ $up$ $the$ $RPM$ $(only$ $if$ $the$ $operator$ $sets$ $the$ $pressure$ $initially$ $and$ $is$ $in$ $Pressure$ $Mode)$
When should a supply operator recheck the discharge pressure?
$Once$ $a$ $hydrant$ $supply$ $is$ $established$
What should a supply engine driver do once on hydrant water?
$Radio$ $to$ $command$ that they are on a hydrant
How should an individual identify themselves when speaking on the radio as an engine driver?
Engine ___ Driver should be used as an identifier when attempting to talk to another engine driver
What are some reasons for using a two-stage pump instead of a single-stage pump?
Meeting pressure requirements necessary for pumping water through standpipe systems in high-rise buildings
What is one of the disadvantages of running a two-stage pump in pressure mode?
Increased wear on the engine
Why must a decision be made by the pump operator as to which mode the pump will be operated in during an incident?
To avoid complications during firefighting operations
What is the main benefit of placing the supply pumper as close to the positive source (hydrant) as possible?
Eliminating the need for changing pump modes during active firefighting operations
How does running the pump in volume mode benefit the pump operator?
Reduces wear on the engine
Why is it important to eliminate the need for changing pump modes during active firefighting operations?
To avoid complications during firefighting operations
What can the supply pumper do if the attack pumper tries to flow more water than is available to it?
Initiate a mode transfer
How does placing the supply pumper closer to the hydrant benefit the attack pumper?
Eliminates mode transfer requirement
What is one of the advantages of running a two-stage pump in volume mode for fires not involving a high rise?
Less wear on vehicle
What is the operation called when the supply pumper and attack pumper are set up in series?
Double pressure of water
What does pumping in series allow the supply pump operator to do for the attack pump operator?
Transfer double amount of water to attack pumper
Why is the relationship of increasing pressure to increasing available volume considered not unlimited?
Limited space within pump housing
What can the supply pumper do if the attack pumper tries to flow more water than is available to it?
Initiate a mode transfer
Study Notes
Series Supply Operations
- Placing the supply pumper close to the hydrant allows for more efficient use of resources and benefits the attack pumper by reducing the distance the water has to travel, resulting in less pressure loss.
- When the supply pumper and attack pumper are set up in series, it is called a series supply operation.
Pump Operations
- Pumping in series allows the supply pump operator to control the pressure sent to the attack pump, ensuring the attack pump is not overwhelmed.
- Running a two-stage pump in volume mode is beneficial for fires not involving high-rise structures because it allows for more water volume without excessive pressure.
- Running the pump in volume mode benefits the pump operator by allowing for better control over the water flow.
- One disadvantage of running a two-stage pump in pressure mode is that it can lead to excessive pressure, which can be harmful.
Hydrant Operations
- When the supply engine shows pressure on their intake gauge, it indicates that the hydrant is supplying water.
- Connecting two engines together with a second supply line allows for a backup supply line in case of failure.
- Establishing a series supply operation near the hydrant ensures a continuous water supply to the attack engine.
- Series supply allows pump operators to supply water from one engine to another if needed.
Safety Precautions
- The attack pump operator should not charge the backup line on tank water alone to avoid emptying the tank and losing water supply.
- The supply driver should continually evaluate their discharge pressure to ensure it is not too high or too low.
- Sending the attack engine 80-100 PSI initially indicates a safe and efficient water supply.
Communication and Identification
- When speaking on the radio, engine drivers should identify themselves by identifying their engine number.
- Pump Boss engines require continuous monitoring to maintain the desired discharge pressure.
Engine Operations
- The impeller in a fire pump is responsible for increasing water pressure.
- A supply engine driver should spot the hydrant properly to ensure efficient water supply.
- A supply engine driver should recheck the discharge pressure regularly to ensure it is within the safe range.
- Once on hydrant water, a supply engine driver should ensure a steady water supply.
Test your knowledge of the firefighting water supply protocol with this quiz. The quiz covers topics such as securing a permanent water supply, managing tank water, and charging backup lines.
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