NC Public Utilities License Study
|\ |\ |\ |\ |\
Guide - SET G questions with |\ |\ |\ |\ |\ |\
answers
Iron pipe is now classified as two types....
|\ |\ |\ |\ |\ |\ |\
The older cast iron materials are called Gray Iron
|\ |\ |\ |\ |\ |\ |\ |\
The newer materials are called Ductile Iron
|\ |\ |\ |\ |\ |\
Cement mortar linings of Ductile Iron Pipe may be repaired in the
|\ |\ |\ |\ |\ |\ |\ |\ |\ |\ |\ |\
field in accordance with
|\ |\ |\
ANSI/AWWA C104/A21.4 |\
Defective or damaged areas of cement mortar linings may be
|\ |\ |\ |\ |\ |\ |\ |\ |\ |\
patched by |\
cutting out the defective or damaged lining to the metal so that the
|\ |\ |\ |\ |\ |\ |\ |\ |\ |\ |\ |\ |\
edges of the lining not removed are perpendicular to the pipe wall
|\ |\ |\ |\ |\ |\ |\ |\ |\ |\ |\ |\
or slightly undercut. A stiff mortar is then applied to the thoroughly
|\ |\ |\ |\ |\ |\ |\ |\ |\ |\ |\
wetted cutout area and troweled smooth with the adjoining lining.
|\ |\ |\ |\ |\ |\ |\ |\ |\ |\
,In making up tiers of pipe, every other pipe is normally turned so
|\ |\ |\ |\ |\ |\ |\ |\ |\ |\ |\ |\ |\
that
at each end of the tier, the pipe is alternately bell end to plain end.
|\ |\ |\ |\ |\ |\ |\ |\ |\ |\ |\ |\ |\ |\
Pipe to be moved a short distance at the work site, as from one side
|\ |\ |\ |\ |\ |\ |\ |\ |\ |\ |\ |\ |\ |\ |\
of the street to the other, should be
|\ |\ |\ |\ |\ |\ |\
rolled by hand or lifted and moved by machine. It should not be
|\ |\ |\ |\ |\ |\ |\ |\ |\ |\ |\ |\ |\
pushed or dragged. |\ |\
Stacking height limit for Ductile Iron Pipe
|\ |\ |\ |\ |\ |\
approximately 12 feet for safety and handling ease |\ |\ |\ |\ |\ |\ |\
Delivery at trench site - to avoid unnecessary handling, the pipe and
|\ |\ |\ |\ |\ |\ |\ |\ |\ |\ |\
appurtenances should be placed as close as possible to
|\ |\ |\ |\ |\ |\ |\ |\ |\
the position they will occupy in the finished pipeline (normally
|\ |\ |\ |\ |\ |\ |\ |\ |\ |\
placed close to the trench on the side opposite the spoil bank)
|\ |\ |\ |\ |\ |\ |\ |\ |\ |\ |\
, Pipe is normally strung along the trench with the bells facing in the
|\ |\ |\ |\ |\ |\ |\ |\ |\ |\ |\ |\
same direction |\
If there are unlocated gas services along the trench route, a
|\ |\ |\ |\ |\ |\ |\ |\ |\ |\ |\
____________ should be present at the job site to make necessary |\ |\ |\ |\ |\ |\ |\ |\ |\ |\ |\
repairs
gas service agent
|\ |\
To provide a substantial cushion to absorb shock caused by traffic, a
|\ |\ |\ |\ |\ |\ |\ |\ |\ |\ |\
minimum cover of ______ is generally desirable for water mains.
|\ |\ |\ |\ |\ |\ |\ |\ |\ |\
2.5 to 3 feet
|\ |\ |\
The trench bottom should be true and even to give the barrel of the
|\ |\ |\ |\ |\ |\ |\ |\ |\ |\ |\ |\ |\ |\
pipe
soil support for its full length
|\ |\ |\ |\ |\
The trench bottom can be improved by adding
|\ |\ |\ |\ |\ |\ |\
crushed stone up to 2 inches in diameter |\ |\ |\ |\ |\ |\ |\
|\ |\ |\ |\ |\
Guide - SET G questions with |\ |\ |\ |\ |\ |\
answers
Iron pipe is now classified as two types....
|\ |\ |\ |\ |\ |\ |\
The older cast iron materials are called Gray Iron
|\ |\ |\ |\ |\ |\ |\ |\
The newer materials are called Ductile Iron
|\ |\ |\ |\ |\ |\
Cement mortar linings of Ductile Iron Pipe may be repaired in the
|\ |\ |\ |\ |\ |\ |\ |\ |\ |\ |\ |\
field in accordance with
|\ |\ |\
ANSI/AWWA C104/A21.4 |\
Defective or damaged areas of cement mortar linings may be
|\ |\ |\ |\ |\ |\ |\ |\ |\ |\
patched by |\
cutting out the defective or damaged lining to the metal so that the
|\ |\ |\ |\ |\ |\ |\ |\ |\ |\ |\ |\ |\
edges of the lining not removed are perpendicular to the pipe wall
|\ |\ |\ |\ |\ |\ |\ |\ |\ |\ |\ |\
or slightly undercut. A stiff mortar is then applied to the thoroughly
|\ |\ |\ |\ |\ |\ |\ |\ |\ |\ |\
wetted cutout area and troweled smooth with the adjoining lining.
|\ |\ |\ |\ |\ |\ |\ |\ |\ |\
,In making up tiers of pipe, every other pipe is normally turned so
|\ |\ |\ |\ |\ |\ |\ |\ |\ |\ |\ |\ |\
that
at each end of the tier, the pipe is alternately bell end to plain end.
|\ |\ |\ |\ |\ |\ |\ |\ |\ |\ |\ |\ |\ |\
Pipe to be moved a short distance at the work site, as from one side
|\ |\ |\ |\ |\ |\ |\ |\ |\ |\ |\ |\ |\ |\ |\
of the street to the other, should be
|\ |\ |\ |\ |\ |\ |\
rolled by hand or lifted and moved by machine. It should not be
|\ |\ |\ |\ |\ |\ |\ |\ |\ |\ |\ |\ |\
pushed or dragged. |\ |\
Stacking height limit for Ductile Iron Pipe
|\ |\ |\ |\ |\ |\
approximately 12 feet for safety and handling ease |\ |\ |\ |\ |\ |\ |\
Delivery at trench site - to avoid unnecessary handling, the pipe and
|\ |\ |\ |\ |\ |\ |\ |\ |\ |\ |\
appurtenances should be placed as close as possible to
|\ |\ |\ |\ |\ |\ |\ |\ |\
the position they will occupy in the finished pipeline (normally
|\ |\ |\ |\ |\ |\ |\ |\ |\ |\
placed close to the trench on the side opposite the spoil bank)
|\ |\ |\ |\ |\ |\ |\ |\ |\ |\ |\
, Pipe is normally strung along the trench with the bells facing in the
|\ |\ |\ |\ |\ |\ |\ |\ |\ |\ |\ |\
same direction |\
If there are unlocated gas services along the trench route, a
|\ |\ |\ |\ |\ |\ |\ |\ |\ |\ |\
____________ should be present at the job site to make necessary |\ |\ |\ |\ |\ |\ |\ |\ |\ |\ |\
repairs
gas service agent
|\ |\
To provide a substantial cushion to absorb shock caused by traffic, a
|\ |\ |\ |\ |\ |\ |\ |\ |\ |\ |\
minimum cover of ______ is generally desirable for water mains.
|\ |\ |\ |\ |\ |\ |\ |\ |\ |\
2.5 to 3 feet
|\ |\ |\
The trench bottom should be true and even to give the barrel of the
|\ |\ |\ |\ |\ |\ |\ |\ |\ |\ |\ |\ |\ |\
pipe
soil support for its full length
|\ |\ |\ |\ |\
The trench bottom can be improved by adding
|\ |\ |\ |\ |\ |\ |\
crushed stone up to 2 inches in diameter |\ |\ |\ |\ |\ |\ |\
