age 1 of 39
Distribution/Treatment Review questions with verified
answers.
Flow measuring devices in a typical compound meter?
......ANSWER........Velocity meter for high flow and displacement
meter for low flow.
This must be provided at distribution system pipe bends?
......ANSWER........Thrust restraint at the bend
The minimum size water main to supply a standard fire hydrant?
......ANSWER........6 inch
Material removed from a trench or excavation?
......ANSWER........Spoil
Stages or bowls are added to a line shaft turbine pump to
increase this? ......ANSWER........The total head pump produces
,age 2 of 39
Theoretical suction lift for a centrifugal pump, at sea level?
......ANSWER........33.9 ft
Chlorine gas is visible in the air at this concentration?
......ANSWER........100 ppm
Exhaust vents for chlorine handling facilities should be located
where? ......ANSWER........Near the floor of the chlorine facility
A self contained breathing apparatus for chlorine handling
facilities should be located where? ......ANSWER........On a wall
just outside the chlorine room facility
This can be provided to protect steel tanks and pipe from
corrosion? ......ANSWER........Cathodic protection
Rapid opening or closing of a fire hydrant valve can cause this?
......ANSWER........Water hammer
,age 3 of 39
Minimum distribution system pressure that should be maintained
during fire flow? ......ANSWER........20 psi
The purpose of distribution system valves? ......ANSWER........They
enable isolation of small portions of the system for maintenance
or repair
Process of making a connection to a water line that is under
pressure? ......ANSWER........"Live tap" or "Wet tap"
These condition can result in a reduction in the "C" factor for
distribution system water mains, with subsequent increase in
friction loss? ......ANSWER........Tuberculation or scale deposition
Distribution system air and vacuum relief valves should be
placed here? ......ANSWER........At high points
, age 4 of 39
Purpose of thrust blocking? ......ANSWER........Keep pipe joints
from separating
Recommended spacing interval for distribution system isolation
valves in a residential area. ......ANSWER........Every 800 ft
Used to "passivate" or provide a protective film on distribution
system mains to reduce corrosion? ......ANSWER........Silica
compounds or Polyphospahtes
Purpose of a dry barrel hydrant ......ANSWER........Protects the
hydrant from freezing
Plan view maps are used in the distribution system to?
......ANSWER........Determine horizontal dimensions and layout.
Section of elevation view maps are used in the distribution
system to? ......ANSWER........Determine depths and elevations
Distribution/Treatment Review questions with verified
answers.
Flow measuring devices in a typical compound meter?
......ANSWER........Velocity meter for high flow and displacement
meter for low flow.
This must be provided at distribution system pipe bends?
......ANSWER........Thrust restraint at the bend
The minimum size water main to supply a standard fire hydrant?
......ANSWER........6 inch
Material removed from a trench or excavation?
......ANSWER........Spoil
Stages or bowls are added to a line shaft turbine pump to
increase this? ......ANSWER........The total head pump produces
,age 2 of 39
Theoretical suction lift for a centrifugal pump, at sea level?
......ANSWER........33.9 ft
Chlorine gas is visible in the air at this concentration?
......ANSWER........100 ppm
Exhaust vents for chlorine handling facilities should be located
where? ......ANSWER........Near the floor of the chlorine facility
A self contained breathing apparatus for chlorine handling
facilities should be located where? ......ANSWER........On a wall
just outside the chlorine room facility
This can be provided to protect steel tanks and pipe from
corrosion? ......ANSWER........Cathodic protection
Rapid opening or closing of a fire hydrant valve can cause this?
......ANSWER........Water hammer
,age 3 of 39
Minimum distribution system pressure that should be maintained
during fire flow? ......ANSWER........20 psi
The purpose of distribution system valves? ......ANSWER........They
enable isolation of small portions of the system for maintenance
or repair
Process of making a connection to a water line that is under
pressure? ......ANSWER........"Live tap" or "Wet tap"
These condition can result in a reduction in the "C" factor for
distribution system water mains, with subsequent increase in
friction loss? ......ANSWER........Tuberculation or scale deposition
Distribution system air and vacuum relief valves should be
placed here? ......ANSWER........At high points
, age 4 of 39
Purpose of thrust blocking? ......ANSWER........Keep pipe joints
from separating
Recommended spacing interval for distribution system isolation
valves in a residential area. ......ANSWER........Every 800 ft
Used to "passivate" or provide a protective film on distribution
system mains to reduce corrosion? ......ANSWER........Silica
compounds or Polyphospahtes
Purpose of a dry barrel hydrant ......ANSWER........Protects the
hydrant from freezing
Plan view maps are used in the distribution system to?
......ANSWER........Determine horizontal dimensions and layout.
Section of elevation view maps are used in the distribution
system to? ......ANSWER........Determine depths and elevations
