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Pipe 160 > Test 3 > Flashcards

Test 3 Flashcards

1
Q
  1. T/F Both relief valves and safety valves are the two most common safety devices designed to prevent overpressure conditions in process industries.
A

True

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2
Q

________ is the abnormal rapid reciprocating motion of the movable parts of a relief valve in which the disc contacts the seat repeatably.

A

Chatter

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3
Q

______ is the pressure increase over the Maximum Allowable Working Pressure (MAWP) of equipment during discharge through the protecting pressure relief valve and is usually expressed as a percentage of the MAWP.

A

Accumulation

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4
Q

_______ is the pressure at which the relief valve starts to open.

A

Set Pressure

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5
Q

The sun is a pressure source for relief valves in thermal expansion relief valve scenarios.

A

True

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6
Q

T/F A relief valve will rapidly fully open (pop) when the set pressure is reached.

A

False

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7
Q

T/F The pilot-operated valve allows for more accurate control over the set pressure compared to a spring-operated relief valve.

A

True

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8
Q

A pilot-operated relief valve is ____ susceptible to chattering compared to a spring-operated relief valve.

A

less

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9
Q

A spring operated relief valve ______ require an external power source.

A

does not

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10
Q

Label the parts of the spring operated relief valve. A

A

Bonnet

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11
Q

Label the parts of the spring operated relief valve.
B

A

Spring

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12
Q

Label the parts of the spring operated relief valve. C

A

Disc

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13
Q

Label the parts of the spring operated relief valve. D

A

Adjusting Ring

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14
Q

Label the parts of the spring operated relief valve. E

A

Nozzle

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15
Q

Label the parts of the spring operated relief valve. F

A

Body

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16
Q

T/F In systems containing flammable fluids, the diverted fluid is usually routed through a piping system to a flare header or relief header.

A

True

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17
Q

This type of relief valve is designed to open when the temperature of the process fluid exceeds a certain temperature limit.

A

Temperature-Activated Relief Valve

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18
Q

Identify the bellows in the balanced bellow relief valve A

A

Guide

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19
Q

Identify the bellows in the balanced bellow relief valve B

A

Metal Bellows

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20
Q

Identify the bellows in the balanced bellow relief valve C

A

Disc Holder

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21
Q

If you require a relief valve that is used in a process where the fluid is dirty and contains particulate, you should use a ______ pressure relief valve.

A

Nozzle Type

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22
Q

With a pressure safety valve (PSV), when the set pressure is reached the PSV will ________.

A

Open Rapidly to full open

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23
Q

Name an application where a pressure safety valve is used.

A

Steam Boilers

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24
Q

Section VIII of the ASME Code covering pressure vessels requires pressure relief valves to have lifting levers on __________________________________

A

air, Steam and hot water (over 140°F) service

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25
Q

What are the two common sizes for thermal relief valves.

A

1” x 1” or 3/4” x 1” having minimum orifice area of 0.110 in squared.

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26
Q

A tank that has sun exposure has inlet and outlet valves that are often closed. The tank holds a liquid that expands when heated. Should the tank have a thermal relief valve?

A

Yes

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27
Q

Relief valves are sized based on the _______ area.

A

orifice

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28
Q

The API standard for relief valve orifice sizes are designated by _____.

A

letter

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29
Q

Which API orifice size has a bore dimension of 0.785 in2?

A

H

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30
Q

For a 4” x 6” relief valve, the outlet connection size is _____ inch.

A

6

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31
Q

A hard seat relief valve uses a _______ to ______ seat valve.

A

metal to metal

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32
Q

Name an application that a hard seat relief valve will be used in.

A

Extremely high temperature applications

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33
Q

T/F The composition of the sealing material in the internals of the relief valve will depend upon on the compatibility of media flowing through the valve.

A

True

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34
Q

T/F Pressure relief valves and safety valves should be mounted in the vertical position (upright with the spindle vertical).

A

True

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35
Q

T/F It is good practice to make the inlet piping a smaller diameter than the relief valve inlet size.

A

False

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36
Q

T/F For flanged relief valves, it is a good practice to tighten one side all the way down before tightening the other side

A

False

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37
Q

The nominal size of the outlet piping __________.

A

must be as large or larger diameter than the relief valve out size

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38
Q

T/F The outlet piping of a relief valve should always be supported to prevent damage to the relief valve.

A

True

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39
Q

Name the two common end connections for relief valves.

A

Threaded and flanged

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40
Q

Name two industries that use relief valves.

A

Chemical processing & Oil and Gas Industry

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41
Q

The symbol shown is a symbol is for a ______.

A

P&ID symbol for a relief valve

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42
Q

The symbol shown is a symbol is for a ______.

A

Pilot operated relief valve

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43
Q

T/F Rupture discs can be used multiple times.

A

False

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44
Q

What are the two most used pressure protection devices in industrial plants?

A

Rupture discs and pressure safety valves

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45
Q

T/F Rupture discs provide an instant response to over or under pressurization in a piping system.

A

True

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46
Q

T/F Relief valves and safety valves can fail to function against overpressure.

A

True

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47
Q

T/F Rupture discs can be used in combination with a pressure safety or relief valve.

A

True

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48
Q

T/F Rupture disc can be either round or square.

A

True

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49
Q

_______ acting rupture discs allow higher working pressures and tighter tolerances.

A

Reverse

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50
Q

Identify the domed rupture disc

A

Forward Acting

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51
Q

Identify the domed rupture disc

A

Reverse Acting

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52
Q

Name two materials that rupture discs are constructed from.

A

Carbon Steel and Stainless Steel

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53
Q

Name three industries where rupture discs are used.

A

Petrochemical, railroad and Chemical

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54
Q

Name the two ways in which rupture discs are installed.

A

Directly between flanges or inserted into a corresponding rupture disc holder which is then mounted between flanges

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55
Q

Name an application where a rupture disc is used in a primary relief option.

A

A pressure vessel with no permanent supply connection

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56
Q

Name an application where a rupture disc is used in a primary relief option. Can be used with pressure relief valves in parallel.

A

Rapid & large pressure rise where extremely fast action is required to prevent catastrophic failure.

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57
Q

Name a benefit of using a rupture disc upstream of a relief valve.

A

Protects the PSV/PRV from fluids containing solids, that may plug/damage the valves.

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58
Q

The burst pressure requested by the user is the ________ burst pressure.

A

specified

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59
Q

The accuracy of the rupture disc’s performance is known as burst _______.

A

tolerence

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60
Q

Name two advantages of a rupture disc.

A

Leak tight seal and High reliability

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61
Q

Name a disadvantages of a rupture disc.

A

Must be replaced after each occurrence

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62
Q

The P&ID symbol for a rupture disc is

A

b

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63
Q

T/F A check valve allows fluid (liquid or gas) to flow through it in only one direction.

A

True

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64
Q

What is the primary function of a check valve?

A

Protect mechanical equipment in a piping system by preventing reversal of flow by the fluid.

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65
Q

How are check valves labeled to show the proper direction of flow?

A

Typically have an arrow on its body to show the proper direction of the flow

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66
Q

What is cracking pressure?

A

The minimum upstream pressure required to open a check valve enough to allow detectable flow.

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67
Q

The most common check valve used in industry is the _______ check valve.

A

Swing

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68
Q

This type of check valve is designed to fit in tight spaces and is a good choice where a short length check valve is required.

A

Wafer check valve

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69
Q

T/F It is possible for foreign particles to get stuck between the check valve seat and disc.

A

True

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70
Q

Label the components of the wafer check a.

A

Plate

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71
Q

Label the components of the wafer check valve b.

A

Body

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72
Q

Label the components of the wafer check valve c.

A

Spring

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73
Q

Label the components of the wafer check valve d.

A

Plate Hinge Spring

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74
Q

Label the components of the wafer check valve e.

A

Spring Restraining Pin

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75
Q

Name three commonly used check valves.

A

Swing, wafer and ball

76
Q

Wafer check valves can be installed in _____ positions.

A

both horizontal and vertical

77
Q

T/F For systems with pulsating flow, a swing check valve is a good choice.

A

False

78
Q

_______ are used in wafer check valves to assist the valve in closing and preventing reverse fluid flow.

A

Springs

79
Q

Name two recommended guidelines for inspection of swing check valves.

A

Check for leakages and look for any sign of corrosion, rust and wear

80
Q

T/F Swing check valves are prone to water hammer issues.

A

True

81
Q

T/F A wafer check valve can be inspected while in service.

A

False

82
Q

The only moving part of a ball check is a(n) ___________.

A

Spherical ball

83
Q

T/F For a ball check valve, the ball is available in different weights to match the application.

A

True

84
Q

Label the parts of the piston check valve a.

A

Springs

85
Q

Label the parts of the piston check valve b.

A

Spacers

86
Q

Label the parts of the piston check valve c.

A

Seating Surfaces

87
Q

Label the parts of the piston check valve d.

A

Seating Surfaces

88
Q

Label the parts of the piston check valve e.

A

Valve Stem

89
Q

Label the parts of the piston check valve f.

A

Valve Bonnet

90
Q

Label the parts of the piston check valve g.

A

Cage

91
Q

Label the parts of the piston check valve h.

A

Main Plug Valve

92
Q

This part of the piston check valve is used to help in closing the valve immediately when suction pressure starts reducing.

A

The Spring

93
Q

This type of check valve has a short linear stroke and spring return action combine to close the valve prior to flow reversal which effectively eliminates the shock and water hammer.

A

Silent Check Valves

94
Q

What is the likely cause of a chattering or vibrating silent check valve.

A

Fluid moving at a high velocity

95
Q

The P&ID symbol for a check valve is ______.

A

b

96
Q

What is a sampling valve used for?

A

For taking a representative portion of a fluid (gases, liquids, solids, or slurries) from a live process to test typically for the purpose of identification, quality control, or regulatory assessment. Also can be used of or injecting a substance into a process.

97
Q

Name the three common sampling valve end connections.

A

Flanged, Welded and Threaded

98
Q

T/F In the chemical industry, a sample must not contain remains of previous batches that may have stayed in the valve’s dead space.

A

True

99
Q

What is the problem with using a ball valve for obtaining a representative sample?

A

Liquid stays in the ball and the next time it is opened, the liquid flows first. The valve must be flushed before the sample is taken.

100
Q

T/F When sampling hazardous chemicals, it is important that the operator is not exposed to toxic fumes or vapors.

A

True

101
Q

What is the advantage of using a sampling valve with a piston?

A

The valve ensures that new product samples are always taken with no prior sample material remaining.

102
Q

In the natural gas industry to take a representative sample, the sampling probe should _____.

A

extended to the center third of the pipe

103
Q

Name two components that are commonly added to a sampling probe in the natural gas industry.

A

Pressure regulator and membrane filter

104
Q

What issue can liquid pose when included in the gas sample?

A

Impact the accuracy of the compositional analysis and damage the analyzer.

105
Q

What does the A+ manifold have to monitor the pressure?

A

Pressure gauge and ball valve

106
Q

Define an actuator.

A

An actuator is a device that converts energy into a mechanical force to enable movement of a valve.

107
Q

Name three sources of energy for an actuator.

A

pneumatic (compressed air), pressure, hydraulic (oil) pressure or electric current which moves the internal mechanical parts of the actuator.

108
Q

Provide the six basic functions that a valve actuator performs.

A

Move the closure component position, maintain the closure component position, seat the valve with sufficient torque, have a failure mode, provide proper rotational capabilities, Operate the appropriate speed.

109
Q

In a single-acting actuator, what provides the power to return an actuator to its original position?

A

A spring provides the power to return the actuator to its original position.

110
Q

T/F A double-acting actuator has ports on both sides of the piston.

A

True

111
Q

What is the largest issue with electrical actuators?

A

They can overheat if there are extreme changes in duty cycle.

112
Q

The amount of torque generated by a hydraulic actuator is ____.

A

High

113
Q

What industry typically uses gas-over-oil actuators?

A

Natural Gas Industry

114
Q

Name two types of valves that rotary actuators are used with.

A

Gate and Globe

115
Q

Name the two main styles of linear actuators.

A

Diaphragm and piston (cylinder)

116
Q

In direct-acting actuators, air enters the _____ area of the diaphragm.

A

Top

117
Q

Direct-acting actuators are suitable for _______ applications.

A

Fail Open

118
Q

Diaphragm actuators are typically used in _______ applications.

A

Throttling

119
Q

Name two industries that use diaphragm actuators.

A

Power, oil & gas, process.

120
Q

Indirect-acting actuators are suitable for _______ applications.

A

Fail Closed

121
Q

Name the two supply pressure ranges for diaphragm actuators.

A

3 to 15 psi or 6 to 30 psi

122
Q

Label the parts of direct acting diaphragm actuator 1.

A

Loading Pressure Connection

123
Q

Label the parts of direct acting diaphragm actuator 2.

A

Diaphragm Case

124
Q

Label the parts of direct acting diaphragm actuator 3.

A

Diaphragm

125
Q

Label the parts of direct acting diaphragm actuator 4.

A

Diaphragm Plate

126
Q

Label the parts of direct acting diaphragm actuator 5.

A

Actuator Spring

127
Q

Label the parts of direct acting diaphragm actuator 6.

A

Actuator Stem

128
Q

Label the parts of direct acting diaphragm actuator 7.

A

Spring Seat

129
Q

Label the parts of direct acting diaphragm actuator 8.

A

Spring Adjuster

130
Q

Label the parts of direct acting diaphragm actuator 9.

A

Stem Connector

131
Q

Label the parts of direct acting diaphragm actuator 10.

A

Valve Stem

132
Q

Label the parts of direct acting diaphragm actuator 11.

A

Yoke

133
Q

Name two advantages of pneumatic diaphragm actuators.

A

Simplicity of operation and low maintenance

134
Q

Name a disadvantage of a pneumatic diaphragm actuator.

A

Cost & maintenance of a compressed air system. Improperly maintained air system can provide air that is contaminated by oil or lubrication, leading to downtime and maintenance.

135
Q

Piston actuators take supply pressure up to ____ psig

A

150

136
Q

T/F Piston actuators are used when the thrust of a diaphragm actuator is too short to move the valve.

A

True

137
Q

T/F Piston actuators can generate higher thrust due to the ability to take higher inlet supply pressures.

A

True

138
Q

Label the parts of the piston actuator 1.

A

Loading Pressure Connection

139
Q

Label the parts of the piston actuator 2.

A

Piston

140
Q

Label the parts of the piston actuator 3.

A

Piston Seal

141
Q

Label the parts of the piston actuator 4.

A

Cylinder Closure

142
Q

Label the parts of the piston actuator 5.

A

Cylinder Closure Seal

143
Q

Label the parts of the piston actuator 6.

A

Seal Bushing

144
Q

Label the parts of the piston actuator 7.

A

Stem Connector

145
Q

Name the type of actuator for the P&ID symbol

A

Electric or Motor

146
Q

Name the type of actuator for the P&ID symbol

A

Diaphragm

147
Q

Name the type of actuator for the P&ID symbol

A

Hydraulic

148
Q

Name the type of actuator for the P&ID symbol

A

Piston

149
Q

Name the type of actuator for the P&ID symbol

A

Electro/Hydraulic

150
Q

Amount of torque to unseat an initially closed valve.

A

Breaking Torque

151
Q

Amount of torque that leads to a valve being fully closed.

A

Closing Torque

152
Q

Design to close a valve automatically in event of system failure.

A

Fail Closed

153
Q

Design to open a valve automatically in event of system failure.

A

Fail Open

154
Q

Design to have a valve stay in current position in the event of a system failure.

A

Fail Last Position

155
Q

Air supply pressure required to operate a pneumatic actuator.

A

Supply Pressure

156
Q

The material flowing through a valve.

A

Media

157
Q

Throttling flow by varying the valve position between open & closed.

A

Modulating

158
Q

Linear distance from the center of rotation upon which a force acts to produce torque.

A

Moment arm

159
Q

Basic full open or full closed operation to start or stop flow.

A

On/Off Service

160
Q

Force required to operate a valve expressed in foot-pounds

A

Operating Torque

161
Q

Set of electrical contacts that are activated mechanically at a preselected position.

A

Limit Switch

162
Q

Amount of force required to operate the control mechanism (valve)

A

Torque

163
Q

The mechanism used to open and close a valve is known as ________.

A

actuator

164
Q

The capability provided to actuators that allows the manual positioning of the actuator is known as a ___________.

A

Manual Override

165
Q

The maximum amount of torque that can be implemented on a valve train before it malfunctions or is damaged is known as the __________.

A

MAST Maximum Allowable Stem Torque

166
Q

The percentage of time a device is allowed to operate over a given period of time and is expressed in a percentage is known as _______.

A

Duty Cycle

167
Q

A code established for electrical components by the National Electric Manufacturers Association is known as the _____ Rating.

A

NEMA

168
Q

Identify the National Electric Manufacturers Association rating for the following electrical accessory enclosure applications - Indoor use and protects components from contact

A

NEMA 1

169
Q

Identify the National Electric Manufacturers Association rating for the following electrical accessory enclosure applications -Indoor/outdoor use that is watertight and dust tight. Protects from windblown dust and rain.

A

NEMA 4

170
Q

Identify the National Electric Manufacturers Association rating for the following electrical accessory enclosure applications - Indoor/outdoor use that is watertight and dust tight. Protects from windblown dust and rain and is corrosion resistant.

A

NEMA 4X

171
Q

Identify the National Electric Manufacturers Association rating for the following electrical accessory enclosure applications-Explosion proof rating (Class I, Division 1, Groups A, B, C, and D) for an area that will contain gasoline or naptha.

A

NEMA 7

172
Q

Identify the National Electric Manufacturers Association rating for the following electrical accessory enclosure applications - Explosion proof rating (Class II, Division 1, Groups E, F, G) for an area that will contain coal, coke dust, or flour.

A

NEMA 9

173
Q

A machined coupling and plate, spool, or length of rectangular tubing designed to adapt an actuator to a valve is known as a __________.

A

Mounting Bracket

174
Q

The maximum temperature of the flow media that is used in the selection of the proper valve material for the application is known as _______.

A

Maximum Service Temperature

175
Q

The temperature of the air surrounding the actuator is known as the _________.

A

Ambient Temperature

176
Q

This type of actuator uses compressed air or liquid to move the actuator in one direction and relies on a spring to return the actuator to its original position.

A

Single Acting

177
Q

This type of actuator uses compressed air or liquid to both open and close the valve.

A

Double Acting

178
Q

Name the two main types of actuators.

A

Rotary and Linear

179
Q

T/F The most common manual operator on smaller quarter-turn valves is the basic lever.

A

True

180
Q

On small valves where leverage is not needed, ____ shaped knobs are often used

A

these may be replaced by ovals, tees, or other

181
Q

T/F Some manual levers have a means to lock them in place.

A

True

182
Q

A lever with a _______ is also known as a dead man’s lever.

A

Spring Return

183
Q

What purpose does the gearbox (gear assembly) serve with the hand wheel to operating the valve?

A

Increases mechanical leverage

184
Q

Hand wheels with a gear assembly are commonly found on ball and butterfly valves larger than ___ inch

A

8

185
Q

What accessory is added to access a large valve that is located out of reach from the ground?

A

Chain Wheel

186
Q

A manual valve where the valve position needs to be known are equipped with a _______.

A

Position indicators

Pipe 160 (4 decks)

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