Chapter 8 - Fireground Hydraulic Calculations Flashcards
The dynamic environment of the fireground usually is not conducive to performing lengthy ___________ equations.
mathematical
During emergencies, drivers commonly use these methods for determining pressure loss and pump discharge pressure:
- flow——
- ——— calculators
- —- charts
- condensed - method
- — flowing
- flowmeters
- hydraulic calculators
- pump charts
- condensed Q method
- GPM flowing
Flowmeters ________ the number of calculations required of a driver/operator on the fireground.
- lengthen
- build up
- multiplies
- reduce
- reduce
To insure reliability of a flowmeter, they must be __________ in accordance with the manufacturer’s recommendations.
maintained
Flowmeters MEASURE and DISPLAY water flow in WHAT per minute?
gallons
Do you have to do any further calculations when a flow meter reflects the water pressure if the hoseline is functioning at its rated capacity?
NO
When automatic nozzles are employed with handlines, what makes the ability to quickly and accurately determine flow for a particular hoseline in gallons per minute?
use of a flowmeter
Because handlines or master stream devices maintain a perdetermined nozzle pressure and a stream that appears adequate, what may automatic nozzles lead you to do as a driver that is hazardous?
supply insufficient discharge pressures
What can relieve you from relying on calculations based on friction loss, elevation pressure and length of the hoseline?
flowmeter
Based on NFPA 1901, for every discharge outlet equipped with a flowmeter, a \_\_\_\_\_\_\_ \_\_\_\_\_\_ shall also be provided. A. pressure gauge B. discharge cap C. backflow meter D. all of these
A. pressure gauge
What must a flowmeter display flows in increments of?
10 gpm OR LESS
What are the 2 most common flowmeters?
paddlewheel and spring probe
For a paddlewheel flowmeter, why is it mounted at the top of a straight section of the discharge?
so only a small portion of the device extends into the waterway
For a paddlewheel flowmeter, it is mounted at the top of a straight section of the discharge so only a small portion of the device extends into the waterway. Why?
reduce the impediment of the waterflow and lessens the chance of damage from any debris in the pipe
What type of flowmeter works when water moves past the it, a sensor measures the speed at which it spins and translates the information into a flow measurement?
paddlewheel
What type of flowmeter employs a stainless steel spring probe to detect water movement in the discharge piping?
spring probe
The \_\_\_\_\_ the flow, the more the spring is bent on a spring probe flowmeter. A. slower B. less C. colder D. greater
D. greater
In a spring probe flowmeter, an electrical charge is transmitted from the spring to the display unit for the driver to view. TRUE or FALSE
TRUE
How many simple moving parts are on a spring probe flowmeter that tends to require very little maintenance?
1
With proper calibration, a flowmeter in good working order should be accurate to tolerance of plus or minus _ percent? (for flow of 100 gpm, the display should be no more than _ gallons off)
- 3
- 3
Each discharge equipped with a flowmeter must have a DIGITAL readout display mounted with _ inches of the control valve for that discharge. A. 1 B. 6 C. 9 D. 5
B. 6
If a pressure gauge is mounted at the 6-inch location to the control valve, the flowmeter mus be mounted with _ inches adjacent to the pressure gauge. A. 1 B. 6 C. 9 D. 2
D. 2
Some apparatus feature monitoring devices that offer drivers additional information:
- the ___ through any specific discharge
- the total water flow through the pump in “____-time”
- total water flowed through the pump for the ________ of the incident
- the amount of ____ being flowed
- flow
- real
- duration
- foam
Who may determine when to use each type of flowmeter?
AHJ
What are 2 applications for flowmeters from the book?
- diagnosing waterflow problems
- relay pumping
What can be used by the driver to identify waterflow issues?
flowmeter READING
What might register a change in the flowmeter’s reading? (2)
kink or closed valve
If the volume of the water at the nozzle suddenly decreased and there is no change to the flowmeter, what might you diagnose as the problem?
burst hose section
During the initial phase of relay setup, what can a driver use in order to feed a supply line without having to know the volume of water flowing form the receiving pumper? (2)
- flowmeter
- pumper’s master discharge gauge
During the initial phase of relay setup, a driver can use the flowmeter and pumper’s master discharge gauge in order to feed a supply line without having to know the volume of water flowing form the receiving pumper. Until when should you increase the engine speed?
till the flowmeter reading no longer increases
When you increase the speed of the engine until the flowmeter reading no longer increases, it will estabilish the correct ______ pressure to supply and adequate volume of water to the _______ pumper.
- discharge
- receiving
In relay operations, should you just leave the flowmeter and intake pressure gauges? YES or NO
NO, monitor both
In relay operations, the intake pressure reading cannot be allowed to drop below __ psi.
20
In relay operations, be careful not to \_\_\_\_\_\_\_ the next pumper in the relay. A. overpressurize B. skip C. park to close to D. park to far away from
A. overpressurize