Pumping Apparatus Flashcards
NFPA 1901 braking test requires that all new apparatus be brought to a complete stop from the speed of _______ in a distance not to exceed _____feet
20 mph
35 feet
The parking break should hold the apparatus and place on a grade of ______ percent
20%
NFPA standard requires all apparatus equipped with airbrakes to build sufficient level to allow vehicle to operate within _____ seconds
60
The airhorn will not operate when air pressure drops below ____psi
80
In general steering wheel play should be no more than _____degrees in either direction
10
When more than one emergency vehicles responded along the same route unit should travel at least ______ to______feet apart
300 to 500
The collapse zone of the building should be equal to
The height of the building
A measure of heat absorbing capacity of a substance
Specific heat
The primary way water extinguishers fire is by ______or ________heat from the fire
Cooling or absorbing
The amount of heat required to raise the temperature of 1 pound of water 1°F
Btu
The quantity of heat absorbed by a substance when it changes from a liquid to a vapor
Latent heat of vaporization
The temperature at which a liquid absorbs enough heat to change to vapor is known as
Boiling point
The density of the liquid in relation to water is known
Specific gravity
The weight of one cubic foot of water is approximately
62.5 pounds
One square inch column of water 1 foot high exerts a pressure at its base of
.434 psi
At sea level atmospheric pressure exerts a pressure of
14.7 psi
The heights of water supply above the discharge orifice
Head pressure
Stored potential energy available to force water through pipe fittings firehouse and adapters
Static pressure
The pressure found in a water distribution system during normal consumption demands
Normal operating pressure
The total available pressured not used to overcome friction loss or gravity of forcing water through the pipes, fittings, firehose, and adapters
Residual pressure
Above sea level, atmospheric pressure decreases approximately ______psi for every thousand feet
.5 PSI
Suddenly stopping water moving through a hose or pipe results in an energy surge been transmitted in the opposite direction, often at many times the original pressure
Water hammer
Three methods of moving water in the system are
Direct pumping systems
Gravity systems
Combination systems
System uses one or more pumps to take water from the primary source and discharge it through the filtration and treatment process
Direct pumping system
Water system using a primary water source located at a higher elevation than the distribution system
Gravity system
A fire hydrant that receives water from only One Direction is known as
A dead-end hydrant
Hydrant that received order from two or more directions and said to have a circulating feed or a
Looped in line
The grid system consists of the following components
Primary feeders
Secondary feeders
Distributors
Large pipes with relatively widespread spacing that convey large quantities of water to various points of the system for local distribution to smaller mains usually 16 inch pipe
Primary feeders
Network of intermediate size pipes that reinforce the grid within the various loops of the primary feeder system in aid in the concentration of the required fire flow at any point and are 12 inch pipes
Secondary feeders
Grid arrangement of smaller means serve an individual fire hydrants and blocks of consumers 8 inch pipes
Distributors
In residential areas, the recommended size for the fire hydrant supply main is at least _____ inches
6
In business and industrial districts, the minimum recommended sizes _____ inches
8
_____ inch mains should be used On principal streets and in long mains not cross connected at frequent intervals
12
Valves and private fire protection systems are usually two types of indicating valves
Post indicating valves PIV
Outside screw and yolk valves OS&Y
The valve stem inside the post indicating valve has the words ________ and _________printed on it but the position of the valve is shown
Open and shut
The most common type of valve used on most public water distribution systems is
Non-indicating valves
