Engine Ops | Pump Ops 3

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What are the two operating modes of the Pump Boss?

Flow Mode and Temperature Mode

Speed Mode and Power Mode

Pump Mode and Discharge Mode

Pressure Mode and RPM Mode (correct)

What does the governor do in Pressure Mode?

Regulates the intake line pressure

Adjusts the water flow rate

Monitors the water tank level

Maintains a constant pump discharge pressure (correct)

What happens if the max engine RPM is reached in Pressure Mode?

The governor switches to RPM Mode

The message display flashes MAX RPM/OPERATOR (correct)

The pump discharge pressure increases

The engine shuts down automatically

When might there be low or no supply water during pump operations?

Empty water tank, problem on the intake line, air in the pump Signup and view all the answers

What does the governor currently monitor during pump operations?

Discharge pressure and engine RPM Signup and view all the answers

What does the Pressure LED indicate in Pressure Mode?

The Pressure LED will be on Signup and view all the answers

In which mode does the governor switch to RPM Limit Mode if the pressure drops and an increase in engine RPM does not bring the pressure back up?

Pressure Mode Signup and view all the answers

What happens if the discharge pressure remains at a level ABOVE 45 PSI in the RPM Limit Mode?

The governor behaves like a manual throttle Signup and view all the answers

What does the governor do in the Low Water Cycle if the discharge pressure stays above 15 PSI but is less than 45 PSI?

Sets the engine RPM to 1100 RPM Signup and view all the answers

What does the governor do in the Low Water Cycle if the discharge pressure is below 15 PSI?

Sets the engine RPM to IDLE Signup and view all the answers

What does the governor do in RPM Mode if the discharge pressure approaches a limit of 30 PSI over the last established PSI value?

Automatically lowers the RPM Signup and view all the answers

What happens when changing from Pressure Mode to RPM Mode?

The RPM setting becomes the last established RPM value Signup and view all the answers

What is a function of the pilot valve mounted to the exterior of the pump panel?

Controlling the operation of the relief valve Signup and view all the answers

What does an amber light on the pilot valve indicate?

Relief valve engaged (open) Signup and view all the answers

What is the purpose of the strainer on the pilot valve?

Filtering sand, grit, or other objects from valve piping Signup and view all the answers

What does turning counterclockwise do on pressure adjustment handle?

Decreases pressure required to open the relief valve Signup and view all the answers

What could happen if the intake relief valve is found to be discharging below the desired 180 PSI?

Large amounts of ice forming during cold weather operations Signup and view all the answers

Why is it important to periodically flush debris out of the pump?

To avoid rust and corrosion inside the pump housing Signup and view all the answers

What is back flushing?

Flowing water in reverse through the pump to clear debris Signup and view all the answers

How is back flushing done?

A positive water source is hooked up to the pump discharge, and water is flowed out the remaining intakes and discharges Signup and view all the answers

What should be done prior to back flushing the pump?

Contact the Support Services Apparatus Maintenance Captain Signup and view all the answers

Why are replacement intake screens needed?

To replace corroded or damaged screens Signup and view all the answers

How can older intake screens be removed if they are corroded in place?

Use needle nosed pliers or webbing to pull out the screens Signup and view all the answers

Why should caution be exercised when removing older intake screens?

To avoid breaking the screens Signup and view all the answers

What could happen if an intake relief valve is not adjusted properly?

Limiting intake pressure available to an attack engine during series pumping operations Signup and view all the answers

What should be done once the intake relief valve is tensioned to achieve desired pressure?

Tighten the locking screw (if applicable) Signup and view all the answers

Why should crews regularly flow water from a supply source through their pumps?

To clear accumulated dirt and debris from their pumps Signup and view all the answers

Why is it undesirable to perform intake relief valve adjustment on the scene of an emergency incident?

It can create a hazard area around the pump for operators Signup and view all the answers

What is the purpose of the intake relief valves?

To regulate pressure surges and prevent damage to supply hose or personnel Signup and view all the answers

What does the relief valve do if the MIV is inadvertently closed, regardless of which side the supply hose is attached to?

Discharges the excess pressure onto the ground Signup and view all the answers

How can you determine the current pressure setting of the MIV relief valves?

Connect a short section adapter and slowly increase discharge pressure Signup and view all the answers

What does it indicate if you observe water discharging onto the ground via the piping during the process of checking the MIV relief valves?

The intake relief valve is activating at a certain pressure Signup and view all the answers

What is a key difference between intake relief valves and discharge relief valves?

Intake relief valves are not intended to be adjusted externally Signup and view all the answers

Why should caution be exercised when removing older intake screens?

To prevent injury from sudden changes in flow Signup and view all the answers

What is the purpose of the pilot valve mounted to the exterior of the pump panel?

To control the water flow from the strainer opening Signup and view all the answers

What does turning counterclockwise do on the pressure adjustment handle?

Decreases pump discharge pressure Signup and view all the answers

What could happen if an intake relief valve is found to be discharging below the desired pressure setting?

Water hammer could occur Signup and view all the answers

Why is it undesirable to perform intake relief valve adjustment on the scene of an emergency incident?

To prevent surges in pressure from damaging supply hose or personnel Signup and view all the answers

What happens if the discharge pressure remains at a level ABOVE 45 PSI in RPM Limit Mode?

The governor activates Low Water Cycle Signup and view all the answers

What is back flushing?

Flushing debris out of the pump Signup and view all the answers

Engine Ops | Pump Ops 3

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Questions and Answers

What are the two operating modes of the Pump Boss?

What does the governor do in Pressure Mode?

What happens if the max engine RPM is reached in Pressure Mode?

When might there be low or no supply water during pump operations?

What does the governor currently monitor during pump operations?

What does the Pressure LED indicate in Pressure Mode?

In which mode does the governor switch to RPM Limit Mode if the pressure drops and an increase in engine RPM does not bring the pressure back up?

What happens if the discharge pressure remains at a level ABOVE 45 PSI in the RPM Limit Mode?

What does the governor do in the Low Water Cycle if the discharge pressure stays above 15 PSI but is less than 45 PSI?

What does the governor do in the Low Water Cycle if the discharge pressure is below 15 PSI?

What does the governor do in RPM Mode if the discharge pressure approaches a limit of 30 PSI over the last established PSI value?

What happens when changing from Pressure Mode to RPM Mode?

What is a function of the pilot valve mounted to the exterior of the pump panel?

What does an amber light on the pilot valve indicate?

What is the purpose of the strainer on the pilot valve?

What does turning counterclockwise do on pressure adjustment handle?

What could happen if the intake relief valve is found to be discharging below the desired 180 PSI?

Why is it important to periodically flush debris out of the pump?

What is back flushing?

How is back flushing done?

What should be done prior to back flushing the pump?

Why are replacement intake screens needed?

How can older intake screens be removed if they are corroded in place?

Why should caution be exercised when removing older intake screens?

What could happen if an intake relief valve is not adjusted properly?

What should be done once the intake relief valve is tensioned to achieve desired pressure?

Why should crews regularly flow water from a supply source through their pumps?

Why is it undesirable to perform intake relief valve adjustment on the scene of an emergency incident?

What is the purpose of the intake relief valves?

What does the relief valve do if the MIV is inadvertently closed, regardless of which side the supply hose is attached to?

How can you determine the current pressure setting of the MIV relief valves?

What does it indicate if you observe water discharging onto the ground via the piping during the process of checking the MIV relief valves?

What is a key difference between intake relief valves and discharge relief valves?

Why should caution be exercised when removing older intake screens?

What is the purpose of the pilot valve mounted to the exterior of the pump panel?

What does turning counterclockwise do on the pressure adjustment handle?

What could happen if an intake relief valve is found to be discharging below the desired pressure setting?

Why is it undesirable to perform intake relief valve adjustment on the scene of an emergency incident?

What happens if the discharge pressure remains at a level ABOVE 45 PSI in RPM Limit Mode?

What is back flushing?

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