Water F Flashcards
what indicates hardness in water
dissolved calcium and magnesium in the water
what is the maximum pressure allowed at the fixture
550 kpa
when servicing a diaphragm flush valve what stops the flush cycle?
force in the upper chamber
what happens when a diaphragm flush valve finishes its cycle?
force in the upper chamber is higher then the lower chamber
which is a differential pressure backflow preventer?
RP
if a jet pump 2 pipe system is working close to lifting capacity, what options are available to you, to increase its capacity?
increase the suction side and drive line sizes
which is allowed to drain into a septic tank?
garbage grinder
what CCC protection device is required for a shampoo sink?
vacuum breaker
what causes back siphonage?
a fire truck using a fire hydrant
what method is used for lowering 100’ submersible pump down with pvc piping?
a truck with well pump hoist
the horizontal water service from the well is back-graded from the pitless adaptor, what will this cause?
loss of prime
what is the main problem with high rise buildings using downfeed system?
balancing the hot water
what prevents back siphonage on a flush valve for a WC?
vacuum breaker
what factors contribute to water’s ability to dissolve soluble material?
solubility of material,
time of contact
ph of water,
temperature of water
when using a pressure tank without air/water separation, how do you remove or vent gases from the water in the tank?
air volume control
the process by which air is brought into intimate contact with water is known as:
aeration
the process by which normal flow thru a filter bed is reversed, thus cleaning the bed is known as:
Backwashing
a gas widely used to disinfect water is:
chlorine
the amount of alkalinity present in water is normally measured by the:
PH scale
untreated water is known as ______ water:
raw
rainwater is normally:
a) corrosive
b) relatively soft
c) slightly acidic
d) all of the above
All of the above
the total hardness of water should not exceed _______ gpg in residential applications:
3.5 gpg
water heater temperature should not be set higher than 140 deg F in order to prevent ______ Hardness from precipitating out of solution:
temporary
temperature, taste, odour, and turbidity are all considered _______ characteristics of water:
physical
soft water is considered to have a hardness of less than _______ gpg:
1 gpg
the iron content of water should not exceed:
0.3 ppm
the simplest method for removing iron (0.3ppm or less) from water is by the use of:
water softener
when using spring water as your source, how do you collect water and protect it from contamination?
an impoundment box around the spring
the acceptable ph range for potable water is:
6.5-8.5
a ph reading of 2.0 would be considered:
extremely acidic
water containing H2S in excess of _____ mg/l is considered to be aesthetically objectionable:
.05 mg/l
the best method for removing taste and odour problems from water is by the use of a:
activated carbon filter
the maximum amount of e coli permitted in potable water is:
0 ppm
waht type of treatment would a water softener be considered?
ion exchange
which type of treatment kills bacteria when used and installed correctly?
chlorination
reverse osmosis can be used to treat bacteriologic-ally unsafe water
T or F
false
All piping downstream of a reverse osmosis unit must be plastic:
T or F
True (its acidic)
which regeneration process provides fora better reserve in a water softener?
Up flow
what is the recommended length of a regeneration cycle for water softeners?
3 days
when sizing water softeners, 1 ppm of iron is equivalent to ______ gpg of hardness:
4
when sizing water softners, 1 ppm of manganese is equivalent to _____ ppm of hardness:
8
a water softener must always be installed ______ of a hot water heater:
upstream
what is one of the most common reasons of why a RO system will continuously run water down the drain?
the ASO valve is broken
a drilled well draws its water from an:
Aquifer
a residential well using a submersible pump would normally have a casing ______ inches in diamter:
4”
the distance in feet or meters that water lowers when being pumped is defined as:
drawdown
what is the minimum grade of PE pipe approved for use in a pump drop pipe:
series 160
a shallow well is normally defines as being no more than _______ feet
25’
which of the following determines when the pump starts and stops?
pressure switch
the most common type of pump used in the private water supply systems is:
centrifugal
according to your modules; each stage of a submersible pump will produce _____ psi:
9
what is the daily water requirement per person (US gal) used when sizing private water supply systems?
60 US Gal
a spring will alsways supply high quality water:
T or F
high pressure
centrifugal pumps that are piped in series will result in:
increased pressure
the maximum practical lift at 2000 feet above sea level is:
23ft
the amount of pressure an impeller will produce is mainly a function of its:
diameter
the amount of flow an impeller will produce is mainly a function of its:
variable displacment
a pump what will produce 345 ft will develop a pressure of ______ psi:
multiply by .433
149.39
a centrifugal pump should cycle no more than _____ per hour
25
what type of pump would be best suited for a fuel transfer station:
diaphragm
what type of pump would be best suited for bodily fluids:
peristaltic
what type of pump is best suited for adding chlorine to a water system?
metering
a centrifugal pump works because of ________ principle:
bernoulli’s
as high pressure enters the ejector of a jet pump, it passes thru the _____ and is converted to high velocity:
nozzle
what converts the high velocity water jet pump ejector to high pressure?
venturi
the larger of the two pipes on a deep well jet pump is the ______ line:
suction
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
normal pressure switch for residential use are:
30-50 psi
a vacuum reading of 1”hg will lift water
1.13’
a vacuum gauge on the suction side of a running pump would show ___________ if the foor valve was stuck closed:
high vacuum
what prevents the water from draining out of the drop pipe when the jet pump stops running?
foot valve
