Mobile Water Supply Test with Correct
Solutions
Static pressure is available pressure at a discharge point without water flowing.
Once water starts flowing from a hydrant, friction loss usually reduces static
pressure to? - ✅✅ Residual pressure
To calculate the appliance pressure loss? - ✅✅ Add 10 psi for each appliance
Identify two correct statements about hydrants - ✅✅ Grid systems with large
supply mains and looping secondary mains generally have less friction losses and
deterioration
If hydrants are color coded, select a light blue hydrant when responding to a large
incident and be sure to test the flow before connecting the hydrant to pump
It is important to monitor the water level in the onboard tank because? - ✅✅ You
need to know if the incident requires additional water before the tank is empty.
As hose diameter increases? - ✅✅ Friction loss decreases
What is the minimum required intake pressure of the apparatus being resupplied? -
✅✅ 20 psi
Static pressure is the available pressure at a discharge point without water flowing.
Once water starts flowing from a hydrant, friction loss usually reduces static
pressure to? - ✅✅ Residual pressure
A hose has a flow rate of 500 gpm with a friction loss of 4 psi, if the flow rate
increases to 1000 gpm, then the friction loss will increase to?? - ✅✅ 16 psi
The hand method provides a fair estimate of? - ✅✅ hose friction loss
The condensed Q formula for a 4in hoseline is? - ✅✅ FL=Q^2/15
Identify five requirements for a MWS apparatus that can be found in NFPA 1901 -
✅✅ 1. An MWS apparatus equipped with a fire pump must have a tank to pump
, line at least two inches in diameter and be capable of supplying the pump with 500
GPM until at least 80% of the tank is emptied.
2. An MWS apparatus must be equipped with at least one external fill connection
connected into the tank that allows the tank to be filled at a minimum rate of 1000
GPM.
3. The external fill connection should be equipped with a valve, strainer, and a 30
degree elbow.
4. Valves that are three inches or larger must be of the slow closing design.
5. An MWS apparatus must have at least three large tank discharges capable of
discharging 90% of the tank volume at an average of 1000 GPM.
When Checking the left front or right front side of the fire apparatus, don't forget to
inspect the: - ✅✅ saddle tanks
Daily inspection - ✅✅ Ensure auxiliary fuel tank is full
Operate pump primer
Inspect auxiliary winterization system.
Weekly Inspection - ✅✅ Clean intake strainers
Pre-service pump certification test are conducted by: - ✅✅ An independent
testing agency
When using a static body of water as your water source during fire apparatus
service testing, the water surface must not be more than___ feet above the
centerline of the pump intake and the water must be at least _____ feet deep. -
✅✅ 10 Feet above
4 Feet deep
If the engine speed check proves the MWS apparatus is running at a different
speed than what which it was originally rated, you need to? - ✅✅ Stop the
testing until the problem is corrected.
Solutions
Static pressure is available pressure at a discharge point without water flowing.
Once water starts flowing from a hydrant, friction loss usually reduces static
pressure to? - ✅✅ Residual pressure
To calculate the appliance pressure loss? - ✅✅ Add 10 psi for each appliance
Identify two correct statements about hydrants - ✅✅ Grid systems with large
supply mains and looping secondary mains generally have less friction losses and
deterioration
If hydrants are color coded, select a light blue hydrant when responding to a large
incident and be sure to test the flow before connecting the hydrant to pump
It is important to monitor the water level in the onboard tank because? - ✅✅ You
need to know if the incident requires additional water before the tank is empty.
As hose diameter increases? - ✅✅ Friction loss decreases
What is the minimum required intake pressure of the apparatus being resupplied? -
✅✅ 20 psi
Static pressure is the available pressure at a discharge point without water flowing.
Once water starts flowing from a hydrant, friction loss usually reduces static
pressure to? - ✅✅ Residual pressure
A hose has a flow rate of 500 gpm with a friction loss of 4 psi, if the flow rate
increases to 1000 gpm, then the friction loss will increase to?? - ✅✅ 16 psi
The hand method provides a fair estimate of? - ✅✅ hose friction loss
The condensed Q formula for a 4in hoseline is? - ✅✅ FL=Q^2/15
Identify five requirements for a MWS apparatus that can be found in NFPA 1901 -
✅✅ 1. An MWS apparatus equipped with a fire pump must have a tank to pump
, line at least two inches in diameter and be capable of supplying the pump with 500
GPM until at least 80% of the tank is emptied.
2. An MWS apparatus must be equipped with at least one external fill connection
connected into the tank that allows the tank to be filled at a minimum rate of 1000
GPM.
3. The external fill connection should be equipped with a valve, strainer, and a 30
degree elbow.
4. Valves that are three inches or larger must be of the slow closing design.
5. An MWS apparatus must have at least three large tank discharges capable of
discharging 90% of the tank volume at an average of 1000 GPM.
When Checking the left front or right front side of the fire apparatus, don't forget to
inspect the: - ✅✅ saddle tanks
Daily inspection - ✅✅ Ensure auxiliary fuel tank is full
Operate pump primer
Inspect auxiliary winterization system.
Weekly Inspection - ✅✅ Clean intake strainers
Pre-service pump certification test are conducted by: - ✅✅ An independent
testing agency
When using a static body of water as your water source during fire apparatus
service testing, the water surface must not be more than___ feet above the
centerline of the pump intake and the water must be at least _____ feet deep. -
✅✅ 10 Feet above
4 Feet deep
If the engine speed check proves the MWS apparatus is running at a different
speed than what which it was originally rated, you need to? - ✅✅ Stop the
testing until the problem is corrected.
