Water supply Mid term Flashcards
A drilled well draws it’s water from a(n):
aquifer
a residential well using a submersible pump would normally have a casing ____ inches in diameter:
4”
the distance in feet or meters that water lowers when the well is being pumped is defined as:
Drawdown
What is the minimum grade of polyethylene pipe approved for use as a pump drop pipe
series 160
the rate at which water flows into a well from its supplying aquifer is defined as:
restores the deplested water from drawdown
Recovery rate
a shallow well is normally defined as being no more than _____ feet deep:
25’
the amount a well is capable of supplying in GPM at a given time is defined as:
well yield
A device for storing water (usually underground) is defined as a:
Cistern
which of the following determines when the pump starts and stops:
pressure switch
the most common type of pump used in private water supply systems is:
Centrifugal
According to your modules, each stage of a submersible pump will produce ____ psi:
9 psi
what is the daily water requirement per person (us gal) used when sizing private water supply?
60
A spring will always supply high quality water:
false
Water from a well should be tested to ensure it is potable a minimum of:
once a year
as high velocity water leaves the impeller vanes and enters the volute, it slows and changes to:
high pressure
centrifugal pumps that are in series will result in:
increased pressure
The maximum practical suction lift at sea level is:
25’
the maximum practical suction lift at 2000’ above sea level is:
23
Subtract 1psi from 25 psi for every 1000’ above sea level
the amount of pressure an impeller will produce is mainly a function of its:
Diameter
Pressure = diameter
the amount of flow an impeller will produce is mainly a function of its:
width
floW
I
D
T
H
centrifugal pumps are classified as what type of pump:
Variable displacement
a Pump that will lift water 345 feet will develop a pressure of ____ psi:
149.39
345’ x .433 psi = 149.39
which type of pressure tank would use an air volume control?
standard
a pressure switch usually has a pressure differential setting of _____ psi:
20psi
a centrifugal pump should cycle no more than ____ times per hour:
25
what type of pump would be best suited for fuel transfer use?
diaphragm
what type of pump would be best suited to move body fluids in a hospital setting?
peristaltic
what type of pump would best be suited to add chlorine to a water system?
metering
sewage pumps generally use what type of impeller?
open
a centrifugal pump works on the ________ principle
Bernoulli’s
the pressure relief valve in a private centrifugal water supply system should be set _____ psi above cut out pressure:
10
a pump that sounds like it has marbles running it is most likely:
in cavitation
As high pressure water enters the ejector of a jet pump, it passes thru the ____ and is converted to High velocity water:
venturi
What converts the high velocity water in a jet pump ejector to high pressure water?
venturi
the larger of the two pipes on a deep well jet pump is the ____ line:
suction
SUCTION = OPEN WIDE KIRBY STYLE
A pressure expressed in terms of a height of column of fluid in feet is defined as:
head
what is the most likely cause of a pump turning on every time there is a demand for water?
pressure tank waterlogged
the minimum size of a pressure tank for agricultural applications is ____ gallons:
42
normal pressure switch settings for residential use are:
30-50 psi
flow rates for pumps are normally expressed as:
US gpm
a vacuum reading 1”hg will lift water:
1.13 ft of head
A vacuum gauge on the suction side of a running pump would show _____ ______ if the foot valve was stuck close:
high vacuum
A vacuum gauge on the suction side of running the pump would show ____ ____ if there was a large hole in the drop pipe above the waterline:
low vacuum
what is the correct ratio of air to water in a standard pressure tank?
1/3 air to 2/3 water
what prevents the water from draining out of the drop pipe when the pump stops running?
foot valve
pressure tanks are sized so that the pump will run for a minimum of ____ minutes:
2.4 mins
private water systems are designed to provide the required amount of water:
during peak demand
the NFPA recommends a minimum supply of _____ gallons of water for 2 hours for fire fighting purposes:
1200 gallons for 2 hours
water from a dug out must always be _____ prior to human consumption
treated
