TPC 347 Valve Maintenance and Piping System Protection

Question 1

A bellows gauge is used to measure

Answer 1

Pressure

Question 2

Install pneumatic piston actuators with the valve in the __________ position; install electric actuators with the valve in the __________ position.

Answer 2

Open; closed

Question 3

Why are bimetallic gauges manufactured with different stem lengths?

Answer 3

To allow placement where the temperature is being measured

Question 4

Which of the following devices is used to measure fluid pressure?

Answer 4

Bourdon tube gauge

Question 5

A mechanism used to open or close a valve is called a(n)

Answer 5

Actuator

Question 6

The maximum air pressure for pneumatic diaphragm actuators is approximately ________ psig.

Answer 6

30psig

Question 7

What is the purpose of tracing a pipeline?

Answer 7

Maintain fluid temperature

Question 8

Condensate in a steam tracing system should be drained to the

Answer 8

not blowdown valve; collection header

Question 9

A Btu is a unit of __________ measurement.

Answer 9

Heat

Question 10

One of the most common signs of insulation failure in steam lines is

Answer 10

Leakage

Question 11

Which of the following describes the heat produced by the sun’s rays?

Answer 11

Radiation

Question 12

One of the disadvantages of electric tracers is that they

Answer 12

Require constant monitoring

Question 13

The two basic types of butterfly valve are _________ and __________.

Answer 13

Water; lug

Question 14

For most pop safety valves, pressure and temperature conditions are usually limited to

Answer 14

250 and 400

Question 15

Chatter in pop safety valves is caused by a _______ volume of flow at a _______ pressure.

Answer 15

Low; high

Question 16

The basic function of a relief valve is to maintain a constant

Answer 16

Pressure at its inlet

Question 17

What causes a pop safety valve to open?

Answer 17

Pressure rising above a preset level

Question 18

What is the maximum amount a pop safety valve can be adjusted from the preset pressure level?

Answer 18

10%

Question 19

The first part of a diaphragm valve to wear out is usually the

Answer 19

Diaphragm

Question 20

If the stem of a globe valve does not move freely, one likely cause is a

Answer 20

Damaged spot on the thread

Question 21

Which type of wrench should be used on a valve body when connecting it to a pipe?

Answer 21

Do not use a wrench on the valve body

Question 22

Which type of valve requires a lubricant to hold a film between surfaces?

Answer 22

Plug

Question 23

The cold service rating of a valve is usually identified by the letters

Answer 23

W.O.G.

Question 24

The first step in stopping leakage around the stuffing box of a gate valve is to

Answer 24

Tighten the gland bolt nuts

Question 25

A vertical lift check valve must be installed with the inlet side

Answer 25

On the bottom

Question 26

Which of the following valve materials is the best choice for service conditions that include high pressures, high temperatures, and a corrosive fluid?

Answer 26

Stainless steel

Question 27

Which wrench type should you use on a pipe with a polished finish?

Answer 27

Strap wrench

Question 28

Which type of check valve is useful for reducing water hammer?

Answer 28

Spring-loaded check

Question 29

Which material is commonly used for constructing smaller-size valves?

Answer 29

Standard cast iron

Question 30

The marking “WOG” on the body of a valve stands for

Answer 30

Cold water, oil, and gas

Question 31

Which of the following valve materials is most likely to be used in high-pressure, high-temperature conditions?

Answer 31

Steel

Question 32

Valves operate most efficiently when installed

Answer 32

Upright