Piping Flashcards
(136 cards)
1
Q
Pipes and fittings are made from which
A
Glass, plastic,and stainless steel
2
Q
Any substance or material that flow is defined as
A
Fluid
3
Q
Why is a steam trap used in steam line
A
Collect condensate
4
Q
To make a turn, a pipeline is fitted with
A
Elbow
5
Q
What happens when sludge or corrosion reduces the I D of piping
A
Pressure decreases
6
Q
If the speed of fluid is doubled,the friction will
A
Increase 4 times
7
Q
What are expansion joints installed in a pipeline
A
Filters, strainers and safety valves
8
Q
What is the best insurance for keeping a piping system operating efficiently
A
Routine preventative maintenance
9
Q
Most piping system problems are caused by
A
Leakage and corrosion
10
Q
What terms are used to express pipe dimensions
A
Outside diameter,inside diameter and inches and fractions of inches
11
Q
A pipe smaller than 12” in diameter schedule 80( extra strong) pipe is
A
I D
12
Q
What is the class of pipeline used to carry compressed air
A
Service
13
Q
A ferrous metal always contains
A
Iron(fe)
14
Q
As fluid viscosity decreases,friction in the line
A
Decrease
15
Q
Water hammer in a piping system occurs when the
A
Flow is suddenly slowed or stopped
16
Q
Welded joints are preferred for applications that involve
A
High temperatures, highly pressures
17
Q
One way to avoid weld icicles and splatter in a pipe weld is to use a
A
Backing ring
18
Q
What is used to prevent oxides from forming when brazing a pipe
A
Acid flux
19
Q
Metal piping is sometimes lined with non metallic piping material to provide
A
Corrosion resistant
20
Q
How much extra capacity,in a waste pipeline usually designed to have
A
40
21
Q
What is the strongest, most pressure resistant concrete pipe
A
Reinforced and prestressed
22
Q
Asbestos cement pipe has advanced of high resistance to
A
Corrosion
23
Q
Plastic piping have which qualities
A
Self insulating properties
24
Q
Section of pipe can be joined by which methods
A
Threading, welding and butt and strap joints
25
Which joining method can also be used to repair leaks in the thermoplastic piping
Fillet welding
26
The correct wrench to use on plastic pipe is
Strap wrench
27
What should you check for when maintaining nonmetallic piping
Leakage,corrosion and secure support
28
Nonmetallic piping can be joined to metal piping by
Flanges
29
If the wall thickness gage of tubing is not specified,you know that it is made of
Birmingham wire gage (BWG)
30
Stander steel tubing ranges in size from
3/16” to 10 3/4”
31
Compared to pipe,tubing is
Flexible
32
Which of the following methods are used for joining tubing
Brazing,welding and threading
33
What kind of tubing would be used for a food processing or clean room application
Aluminum or stainless steel
34
With tubing, the term impact method refers to what kind of operation
Flaring
35
Before tubing can be bent or flared,it should be
Annealed
36
Which tube materials is strong enough to be threaded
Steel
37
What type of tubing is best for low pressure operation at extremely low temperatures
Aluminum
38
Plastic tubes are joined by what method
Fusion
39
What effect must hose be protected against
Temperature,pressure and corrosion
40
What is the diameter of a -16 (dash 16) hose in inches
1”
41
The most common hose for general use is of what type construction
Reinforced nonmetallic
42
The inner section of a hose is called the
Tube
43
Hose section are
Outer- cover
Inner -tube
Carcass - reinforce or centre section
44
To what general classification of pressure does a hose carrying 2500 psi belong
Medium. 2500-300
45
The type of construction most suited to maximum suction conditions is
Wire reinforced spiral wand
46
The nonmetallic hose best suited for use at extremely low temperatures is
Dacron
47
Interlocked metal hose is used in what type of application
Low pressure
48
What materials are distributed from one source to several points,what kind of coupling will most likely be used
Quick connect disconnect
49
What should you look for when inspecting a steam hose
Brittleness, swelling and softening or cover breaks
50
Classification of pressure of hose
Low-0-2500
Medium-2500-3000
High -3000-6000
Very high-6000 and up
51
Which of the functions are performed with the use of fittings
Changes the direction of fluid flow
Provide branch connections
Change the size of pipe and tubing lines
52
What does c/f (centreline of face ) distance equal in a long radius elbow
1 1/2 times the fitting diameter (od)
53
For best fluid flow , which elbow should be used
Long radius
54
The fitting that provides two smaller branches is called
Reducing cross
55
A union is used to
Connect two sections of pipe or tubing
56
What can be used with screwed connections to make them leakproof
Paste dope
Teflon tape
Properly cut threads
57
Which of the flanged joints uses a gasket
Bolted flange
58
A flange that has a plain or flat face should be joined to the flange that has a
Plain face
59
What fitting helps reduce the effect of water hammer
Vibration dampener
60
Most valves are named after the
Internal closing element
61
A gate valve that has two ports and is designed for fluid flow in one direction only is considered a
Two way valve
62
Which of the values provides the most accurate metering of fluid
needle valve
63
When an application calls for fast on off operation,low pressure drop, good sealing and flow in both directions which of the valves is the best choice
Ball valve
64
Large butterfly valves are most likely to be operated by
Electric or hydraulic power
65
The opening in the cylinder of plug valve designed for throttling service is usually what shape
Diamond
66
Which is true of a check valve
Closers automatically
Ensure proper flow direction
Maybe installed vertically or horizontally depending on the type
67
What type of check valve should be used where pressure drop is the major consideration
Swing valve
68
Water for emergency showers is best controlled through use of
Quick opening valves
69
The first step to good valve maintenance is
Careful, periodic inspection and trained personnel
70
What is the best valve to use for vacuum application
Diaphragm vale
71
Which does a diaphragm valve eliminate
Lubricant contamination of fluid
72
Blow off valves in steam boiler applications are used to do which
Blow down boiler pressure
Rapidly lower boiler water level
Clear cleaning solution from boiler
73
What does pressure regulating valves do
Keep line pressure at a preset level
74
In valves, what is feedback
Outlet pressure controlling inlet pressure
75
It is customary to install additional valves in a section of piping that includes which valves
Rupture dic relief
Pressure regulating
Pressure reducing
76
The control unit of a temperature regulating valve includes a
Thermostat
77
The dic of a rupture dic relief valve is usually made of
Metal
78
Which of the following would be installed to help balance pressure on either side of a main valve
Bypass valve
79
A direct operating valve is opened and closed by a
Solenoid plunger
80
Solid particle in the fluid have what harmful effects in piping system
Score pipe or tubing walls
Damage seals and fittings
Damage pump parts
81
Which of the following values problems is caused by solid particles in the fluid
Valve closing elements jammed
82
Where is the coarse scream placed in a strainer
Inside the fine screen
83
What should you do as the first step when removing a strainer for cleaning
Shut off the line
84
On which side of the filter element do filtered particles collect
Entry side
85
What is a filter through which all of the oil in a system passes called
Full flow
86
What happens in a piping system carrying saturated steam (100psi at 170c or 338f) if the steam pressure drops to 50psi
Steam flashes to superheated
87
When there are slight variations in a load or pressure, which of the following traps are used
Upright or bucket trap
88
In which of the following are air vents valves used
Oil lines
89
Why is it difficult to lubricant steam traps
Because of the water steam mixture
90
It is necessary to maintain proper pressure level in a piping system to
Have the most efficient transportation of fluids
91
A pressure gage reads 30 psi at sea level what is the absolute pressure
44.7
92
Fluid pressure of 10 psi is pushing against an area of 5 square inches. What is the total force against the area
50 pounds
93
Which of the following gage elements are spring loaded
Plunger
Bellows
Bourdon tube
94
The component that connects a revolving unit with a fluid line is called a
Rotary pressure joint or rotary union
95
For what reason can vacuum direction
The line may collapse
The fluid may become contaminated
The fluid may become contained
96
When pressure rises in a compressed air line what happens to the air in the receiver
The air is compressed
97
Which of the following is the work preforming elements in an electric actuator
Motor and screw driven shaft
98
The area of an intensifier’s small position is 2 square inches. Area of the large piston is 6 square inches input pressure is 40 psi what is the output of the small piston in psi
120
99
Which of the following wrenches should you use on plated or polished pipe
Strap wrench
100
Gage to absolute pressure
14.7 psi
101
Maximum pressure screw to valve
2500
102
What size does NPT referred to outside diameter of a pipe?
Above 12”
103
As all thickness of a pipe changers the inside diameter changes
True
104
The wall thickens for 10 “ schedule 80 pipe is identical to 10 in extra heavy pipe
False
105
What is the corresponding schedule number for double extra heavy pipe
There is no corresponding number
106
What is the recommended maximum pressure for screw thread pipe joints
2500psi
107
List 3 situations where a welding pipe joint would be preferred over a threaded joint
Pressure is high
Vibration is present
Oil leaks cannot be tolerated
Large o.d. In pipe
108
What are the 3 pressure designation for forged steel fittings
Class 2000,3000,6000
109
The American national standard taper pipe thread( NPT) has 1 in 16(3/4inch pre foot) taper on a diameter and 60 degree thread from
True
110
All pipe threads have the same number of threads per inch
False
111
How does NPTF thread differ from the NPT thread
Crests and roots change to ensure that the spinal clearance around the threads is eliminated
112
Why should a thread sealant be used with NPTF thread
Anti galling purpose
113
Which type of reamer should be used in a power vise to remove internal burrs after cutting a pipe off to length
Straight fluted reamer
114
spiral reamer can be used to remove external burrs
False
115
Over tightening pipe threads in a housing
May split or crack the housing
116
Tube is sized according to the
Outer diameter
117
The wall thickness of tubing is specified by a schedule number similar to iron pipe
False
118
Tubing sized a dash 12(-12) would be 1-1/2 inch tubing
Fales
119
Carbon steel is the only available material for tubing
False
120
When using flared type fittings it is important that the tubing is soft relative to the fittings material
True
121
NPT threads are used when tubing is to be threaded
False
122
When using flared fittings,the double flare is used
When using thin walled tubing
123
The 37 degree flare is the standard angle used for hydraulic tubing
True
124
List 3 advantages that flexible hydraulic hose has over rigid conductors
Simple to route
Can with stand vibration
No problems with thermal expansion
Can dampen hydraulic shock
125
List 3 main components of flexible hydraulic hose
Tube inner
Reinforced
Outer protective cover
126
For a given size, what determines the pressure rating of hydraulic hose
The reinforcement
127
The swayed on type of hydraulic hose end in not reusable
True
128
The dash number used to size hydraulic flexible hoses refers to inside diameter of the hose for most hose types
True
129
A dash 5 flexible hydraulic hoses is what size in inches
5/16
130
A 1-14 inch hydraulic hose is what size
-20
131
For a specific reinforcement, the working pressure of hydraulic hose will become less as the size is increased
True
132
As a hose is pressurized its length will become
Shorter and longer
133
The difference between metering value and a safety value
Metering vale is designed to control the flow of a fluid, safety is designed to rapidly release pressure from a system
134
What is a male end of a hose and a female end
The male end outward threads which screws into the female end
135
What is wrench make up
The amount of thread engagement that occurs after a connection is hand-tightened
3”
136
What type of pipe finish is preferred for hydraulic system
Picked and oil or pickled only
