Exam (elaborations)
Water distribution level 3 Questions with correct Answers 2024
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Water distribution level 3
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Water distribution level 3A factor or value used to indicate the smoothness of the interior of a pipe - answer
factor
Major parts of water distribution - answer Pipes, storage facilities, pumping stations,
valves ,fire hydrants, meters, and other appurtenances
Main purpose of water storage facilities - answer To provide sufficient amount of water
to average or equalize the daily demands on the water supply system
Types of storage facilities - answer Clear wells, elevated tanks, standpipes, ground level
storage tanks , hydro pneumatic or pressure tanks, and surge tanks
20 psi - answer Absolute minimum pressure
35 psi - answerMinimum working pressure
Basic requirements of pipes - answer Adequate strength, durability, maximum
corrosion, resistance and no adverse effect on water quality
Four classes of working pressure are commonly encountered - answer100,150,200,250
psi
Push on and mechanical joints are most often used for - answer Ductile iron pipe.
Flanges, restrained, flexible, and sleeve joints are also used
Flange joints - answer Not flexible
Restrained joints - answer Prevent movement
Flexible joints - answer Permits one joint to move
PE pipe - answer Has the highest cofactors 150
Pipe protection - answer Paint
Rock must be excavated - answer6inches
Ladder must b located - answer25 ft and 3ft above hole
Laying pipe is also called - answerStringing
, The horizontal shoring members are generally referred to as - answer Stringers or
walers
Shield shoring - answer Consists of a rectangular box that must b open on the top and
bottom and usually the ends are open too
Solid sheeting - answerUsed when materials will not stand in a vertical position or not
practical to slope the trench
Types of valves - answerPlug, rotary,butterfly, diaphragm, gate
Entrained - answerAir to escape a line is operating under pressure
4 parts to a hydrant - answerInlet pipe connection from the water supply main,the main
valve,the barrel,the head
Post hydrants - answerExtend above ground most commonly used
Rule of thumb - answerMeter should b one size smaller that service line
3basic backflow devices - answerDouble check valve, reduced pressure(rp),air gap-
provides greatest protection
The source of supply might b a - answerWell
Preventive - answerScheduled
Corrective - answerEquipment failure
Predictive - answerMaintenance program
Bacteriological samples are analyzed for the presence of - answerTotal coliform.
Presence of these bacteria indicates other forms may b present
Minimum chlorine residual - answerFree 0.2mg/l Combined 0.6mg/l
Cross connection - answerA connection between potable water system and an
unknown water supply
The particular type of device most suitable for a given situation depends on -
answerThe degree of hazard
Pressure vacuum breaker and atmospheric vacuum breaker - answerIrrigation
backflows
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