chapter 15 Flashcards
Steel pipe fittings and valves are rated for a maximum pressure at certain maximum
a)temperature
b)outside diameter
c)class designation
d)thread taper
a
Steel piping:
a)Is restricted to moderate pressure installations
b)Has a low corrosion resistance
c)Is brittle
d)Has high corrosion resistance
b
The “Schedule” designation of pipe indicates:
a)Exact internal diameter
b)Wall thickness
c)Approximate external diameter
d)Approximate internal diameter
b
Gaskets are made in three general designs:
a)Flat full-face, flat ring, and ring for ring joints
b)Butt joint, raised flange, and ring for ring joints
c)Slip joint, ring joint, flat face
d)None of the above
a
The nominal pipe size for piping up to and including NPS 12” is
a)A precise indication of internal diameter
b)An approximate indication of internal diameter
c)An approximate indication of external diameter
d)An indication of wall thickness
b
For any given NPS, the outside diameter of the pipe ________ with increasing wall thickness
a)Decreases
b)Remains the same
c)Increases
b
Copper and copper alloys:
a)Lose strength at higher temperatures
b)Are appropriate for use in underground installations
c)Are appropriate for use in all refrigeration systems
d)Have low resistance to the corrosive effects of water
a
A _________ connection is particularly suited for severe service.
a)Welded neck flange
b)Lapped flange
c)Bolt-on flange
d)Grooved piping joint
a
________ connections reduce the strength of the pipe
a)Threaded
b)Welded
c)Flanged
d)Loose flanged
a
DN is
a)The unit for pipe wall thickness
b)A grade of steel pipe
c)The Imperial unit for pipe size
d)The SI unit for pipe size
d
a solid billet is used to produce ______ pipe
a. welded
b. seamless
c. cast iron
d. flanged
b
potable drinking water lines cannot be made from copper
true false
false
cast iron has a high resistance to _______________
a. intense pressure
b. corrosion
c. shock
d. watter hammer
b
__________ is used most often in plumbing systems for cold and hot water lines
a. cast iron
b. steel
c. aluminum
d. copper
b
an advantage of plastic piping is
a. ease of assembly
b. heavy weight
c. high cost
d. resistance to high temp
a
after a pipe is cut with a wheel and roller cutter, there is a burr left on the outside
true
false
false
gaskets are added to flanged joints to prevent leakage
true
false
true
for more flexibility in pipe design _______ joints are used
a. flanged
b. threaded
c. welded
d. soldered
c
Joining or connecting lengths of piping by the use of threaded pipe and screwed connections has the disadvantage of:
A.There is no chance of leakage
B.The strength of the pipe is reduced
C.Gaskets are not required
D.The piping can not be easily assembled or disassembled
E.A qualified welder must be used
b
No lubricant is used on the _____ because any excess lubricant is forced into the piping system.
A.Both male pipe and female fitting threads
B.Outside of the fitting
C.Female fitting threads
D.Male pipe threads
E.Inside of the pipe
c
One of the general types of pipe flanges used is the _____ flange.
A.Raised face
B.Six bolt
C.Flat face
D.Eight bolt
E.Lapped or slip-on
e
For 152.40 mm (6 inch) nominal pipe size the inside diameter will be
A.154.1 mm
B.202.7 mm
C.128.2 mm
D.154.2mm
E.90.1 mm
D
Threaded _____ pipe fittings cannot be used for gas service piping systems.
A.Malleable iron
B.Cast iron
C.Steel
D.Aluminum
E.Copper
b
Copper and copper alloys offer great resistance to:
A.Corrosion
B.Thermal expansion
C.Creep
D.High pressure
E.Breakage
a
The use of welded joints for piping has the advantage over the use of screwed or flanged connections in that:
A.The possibility of leakage is greatly increased
B.The piping is easier to insulate
C.The cost of material is higher
D.The need for maintenance is higher
E.The weight of the piping system is more
b
Joining or connecting lengths of piping by the use of threaded pipe and screwed connections has the advantage of:
A.There is no chance of leakage
B.The strength of the pipe is not reduced
C.A qualified welder must be used
D.The piping can be easily assembled or disassembled
E.Gaskets are not required
d
Welded steel pipe made from flat steel plates that are rolled and welded is used for _____ service.
A.Lower pressure
B.Higher pressure
C.Steam
D.Water
E.Oil
a
Joining or connecting lengths of piping by the use of threaded pipe and screwed connections is generally used for:
A.Low and moderate pressures
B.Low and moderate temperatures
C.Moderate and high pressures
D.Low and high pressures
E.Moderate and high temperatures
a
