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