NEVADA NV A-20 INDUSTRIAL PIPING
CONTRACTOR EXAM 2026 COMPREHENSIVE
EXAM SCRIPT WITH VERIFIED SOLUTIONS
GRADED A+
◉ Nozzle. Answer: A stub-pipe that is shop-welded to a vessel to
facilitate welding a connecting pipe in the field.
◉ O.D.. Answer: Outside diameter
◉ Olet. Answer: A physical object that has a self-reinforced end
intended to be welded onto a hole in the wall of a pipe or a piping
component. The other end is to be connected to another pipe or
piping component.
◉ Orifice plate. Answer: Device used for measuring flow rate, for
reducing pressure or for restricting flow (in the latter two cases it is
often called a restriction plate.
◉ Oxidation. Answer: Interaction between oxygen molecules and
other substances (e.g., metal). With iron, this process causes rust.
,◉ Paddle blind. Answer: Thick piece of metal inserted between
flanges to stop piping flow.
◉ Pipe external surface area. Answer: The area of the outside of the
pipe, expressed in square feet per foot
of pipe.
◉ Pipe fitting. Answer: A joint or connector, as an elbow, union, or
tee, used to connect two or more pipes in a pipe system.
◉ Pipe hanger. Answer: A bracket, clamp, clip, or loop used to
suspend or support pipes by transferring the load of the pipe and
conveyed material to a supporting structure.
◉ Pipe nipple. Answer: A fitting, consisting of a short piece of pipe of
small diameter, usually provided with a male pipe thread at each
end, for connecting two other fittings.
◉ Pipe size. Answer: The approximate diameter of a pipe, specified
using nominal size.
◉ Pipe spool. Answer: Prefabricated components of a piping system,
including the pipes, flanges and fittings, fabricated before they are
delivered to the construction area. Prefabrication allows more
, rapid field pipe assembly.
◉ Pipe wall thickness. Answer: The thickness of the pipe wall,
measured in inches, or similar unit,
generally specified by pipe schedule.
◉ Pipe water weight. Answer: Weight of water that could fit inside
one foot of pipe, expressed in pounds per foot (or similar unit).
◉ Pipe weight. Answer: Weight of pipe in pounds per foot (or similar
unit).
◉ Piping. Answer: System of pipes used to convey all kinds of fluid
materials (liquids and gases).
◉ Piping isometric drawing (Iso). Answer: A pictorial representation
of a piping system in three dimensions. Drawing is not to Scale, does
not show size of piping or components.
◉ Piping orthometric drawing (Ortho). Answer: A two-dimensional
drawing of a three-dimensional
object, using two or more additional drawings to show additional
views of the object. Drawing is to scale, including representation of
piping and components.
CONTRACTOR EXAM 2026 COMPREHENSIVE
EXAM SCRIPT WITH VERIFIED SOLUTIONS
GRADED A+
◉ Nozzle. Answer: A stub-pipe that is shop-welded to a vessel to
facilitate welding a connecting pipe in the field.
◉ O.D.. Answer: Outside diameter
◉ Olet. Answer: A physical object that has a self-reinforced end
intended to be welded onto a hole in the wall of a pipe or a piping
component. The other end is to be connected to another pipe or
piping component.
◉ Orifice plate. Answer: Device used for measuring flow rate, for
reducing pressure or for restricting flow (in the latter two cases it is
often called a restriction plate.
◉ Oxidation. Answer: Interaction between oxygen molecules and
other substances (e.g., metal). With iron, this process causes rust.
,◉ Paddle blind. Answer: Thick piece of metal inserted between
flanges to stop piping flow.
◉ Pipe external surface area. Answer: The area of the outside of the
pipe, expressed in square feet per foot
of pipe.
◉ Pipe fitting. Answer: A joint or connector, as an elbow, union, or
tee, used to connect two or more pipes in a pipe system.
◉ Pipe hanger. Answer: A bracket, clamp, clip, or loop used to
suspend or support pipes by transferring the load of the pipe and
conveyed material to a supporting structure.
◉ Pipe nipple. Answer: A fitting, consisting of a short piece of pipe of
small diameter, usually provided with a male pipe thread at each
end, for connecting two other fittings.
◉ Pipe size. Answer: The approximate diameter of a pipe, specified
using nominal size.
◉ Pipe spool. Answer: Prefabricated components of a piping system,
including the pipes, flanges and fittings, fabricated before they are
delivered to the construction area. Prefabrication allows more
, rapid field pipe assembly.
◉ Pipe wall thickness. Answer: The thickness of the pipe wall,
measured in inches, or similar unit,
generally specified by pipe schedule.
◉ Pipe water weight. Answer: Weight of water that could fit inside
one foot of pipe, expressed in pounds per foot (or similar unit).
◉ Pipe weight. Answer: Weight of pipe in pounds per foot (or similar
unit).
◉ Piping. Answer: System of pipes used to convey all kinds of fluid
materials (liquids and gases).
◉ Piping isometric drawing (Iso). Answer: A pictorial representation
of a piping system in three dimensions. Drawing is not to Scale, does
not show size of piping or components.
◉ Piping orthometric drawing (Ortho). Answer: A two-dimensional
drawing of a three-dimensional
object, using two or more additional drawings to show additional
views of the object. Drawing is to scale, including representation of
piping and components.
