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Pumping Apparatus Highlights 6
Terms in this set (50)
A 1x3 concentrate (alcohol resistant AFFFs) would indicate what?
Designed to be used at 1% on hydrocarbon fuels and 3% on polar solvent fuels.
Three types of foam eductors (proportioners) are?
In-line eductors, foam nozzle eductors, and self-educting master streams
For in-line eductors, follow manufacturer directions regarding ____, and also ____ between eductor and nozzle.
Inlet pressure, hose lay
Back pressure on in-line eductor should not exceed ____ of eductor inlet pressure.
Rated inlet pressure of in-line eductors is usually ___ to ___ psi.
150 to 200 psi.
These three things comprise in-line eductor back pressure.
Nozzle pressure, friction loss in hose lay between eductor and nozzle, and elevation pressure.
The jet ratio controller used with self-educting master streams receives approx. ___ percent of the total water flow, and proportions the concentrate at a ___ percent solution.
Installed in-line eductors are commonly used to proportion ____ foams.
Most commonly used apparatus-mounted proportioner is ____.
Some disadvantages of around-the-pump proportioners include not being able to _____, and can also recirculate foam solution and overadd concentrate to it. To avoid this, _____ when no water is flowing. Some older around-the-pump systems also cannot _____.
Discharge plain water and foam solution simultaneously; turn off bypass valve; take advantage of incoming pressure.
The _____ proportioner is one of the most accurate methods of foam proportioning.
Bypass-type balanced pressure proportioner
This system has a separate pump that provides foam concentrate to the discharge at the same pressure the fire pump is supply water to that discharge.
Bypass-type balanced pressure proportioner
Variable-flow variable-rate direct injection proportioners operates off power supplied from the apparatus _____ system.
Class A foams do not retain their foaming properties if mixed in the water for more than ____.
Early types of CAFS, also known as WES or WEPS (water expansion pumping systems), were limited to a flow rate of about ___ gpm.
Most structural and wildland CAFS fire attacks are done with an airflow rate of ___ to ___ cfm per gallon of foam solution.
0.5 to 1.0 cfm
Standard nozzle rule of thumb: discharge orifice should be no greater than ___ the diameter of the hose size.
Expansion ratios using fog nozzles are between ___ and ___. Their best applicationis when used with ____ and ____ foams.
2:1 and 4:1, regular AFFF and Class A
The only style of nozzle that can be used with protein and fluoroprotein concentrates.
Air-aspirating foam nozzles
Two types of medium- and high-expansion foam generating devices
Water-aspirating type and the mechanical blower.
The ____ oxygen that is required to degrade a particular foam, the better or more environmentally friendly the foam is.
For more information on the environmental impact of any particular foam product, contact ____ and consult ____.
The manufacturer, NFPA 1150
Difference between Class A foam and durable agents
Class A foams utilize aerated foam, while durable agents utilize hydrated foam.
When using durable agents, use at a concentration of ___ for fire extinguishment, and ___ for exposure protection.
NFPA ____ requires drivers to functionally test foam systems.
If NFPA 1901 is contained in the apparatus specifications, two additional manufacturer's test must be performed.
The road test and the hydrostatic test
The road test specifies achieving a speed of ___ mph from a standstill within ___, minimum top speed of ____ mph, and coming to a full stop from ___ mph in ___ feet.
35 mph in 25 seconds, 50 mph, 20 mph in 35 feet.
If apparatus has a pump capacity of less that 750 gpm, it does not have to undergo the _______ test.
Pumping engine overload
Initial certification pumping test operates the pump for ____, while the annual service pumping test requires _____ to complete.
3 hours, 40 minutes.
Pumping engine overload test required to be performed during acceptance testing if buyer is located in area ______.
At greater altitude than 2,000 feet.
Standard for Service Tests of Fire Pump Systems on Fire Apparatus
Ambient air temperature during service testing should be between __ and __ degrees, and water temperature should be between __ and __ degrees.
0 to 100 F, 35 and 90 F.
Gasoline engines have ___ less efficiency for every 1,000 foot altitude increase.
If scribe mark at coupling moves more than ___ during service testing, stop test and replace the hose.
Pump service tests are conducted at four different net pump discharge pressures.
150, 165, 200, and 250 psi
NFPA 1911 requires that all gauges used in service testing be calibrated within ___ of the testing.
Service test gauge ranges: ___ to ___ for vacuum gauges, ___ to ___ for discharge gauges, and pitot tubes are rated from __ to __.
30 in Hg to 0 (or 150 psi for compound gauges), 0 to 400 psi, 0 to 160 psi.
___ can be used instead of pitot tube for service testing.
During vacuum test, no more than ___ inches of vacuum should be lost in 5 minutes.
10 in Hg
Never hold test nozzles ___ during service testing.
40 minute pumping service test composed of:
20 minutes at 150 psi, 10 minutes at 200 psi, and 10 minutes at 250 psi.
Pressure control test: stabilize discharge pressure at ___ psi, then ___ psi, then ___ psi, each time closing discharges one at a time, with discharge pressure not rising more than ___ psi.
150 psi, 90 psi, 250 psi, 30 psi
Capped discharge gauges should be off more than ___ from master discharge gauge.
Tank-to-pump line must provide rated capacity for at least ___ of the tank water.
If pump service test results in less than 90% rating then when new, two options are available:
Remove pump from service to repair and re-test, or give pump a lower rating
Foam proportioning tested in two ways
Finished concentrate solution testing, or measuring amount of foam flowed with known amount of water.
Water used in lieu of foam for proportioning testing is given ___ due to differing viscosity.
A correction factor (provided by the manufacturer)
____ testing is performed for synthetic foams, while ____ testing is done for protein- and fluoroprotein foams.
Establish a base calibration curve for refractivity testing by manually proportioning a foam solution at the proper percentage, and then ___ more and less than recommended.
Conductivity testing for foam is done by comparing the electrical conductivity of the foam solution against ____.
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