3A2-Steam Traps, Water Hammer, Insulation

Front 1

List the trap selection criteria for the application?

1. Condensate capacity, under start-up.

2. Condensate capacity, under normal operating.

3. Condensate temperature the trap will have to handle.

4. Steam header temperature.

5. Pressure differential across the trap.

6. The location of the trap.

a. 1, 3, 4, 5, 6

b. 1, 2, 3, 4, 5, 6

c. 1, 2, 3, 5, 6

d. 1, 2, 3, 4

e. 5, 6.

Back 1

b. 1, 2, 3, 4, 5, 6

Front 2

Find the warm-up load in kg/h in warming up 50 m of 202.7 mm,Schedule 40 steel pipe to a working pressure of 1750 kPa in awarm-up time of 20 minutes. Initial temperature of the pipe is 20°C.

a. 113.45 kg

b. 2.05 kg

c. 223.6 kg

d. 70.24 kg

e. 102.42 kg.

Back 2

e. 102.42 kg.

Front 3

Out of the steam traps listed below, indicate the one that operateson the thermodynamic principle.

a. Impulse

b. Bellows

c. Ball float

d. Inverted bucket

e. Corrugated.

Back 3

a. Impulse

Front 4

In warming up 60 m of 4 inch schedule 40 steel pipe to a workingpressure of 950 kPa from an initial temperature of 12°C in 10minutes, the condensate produced per hour would be:

a. 232.7 kg/h

b. 169.6 kg/h

c. 249.5 kg/h

d. 38.8 kg/h

e. 625.2 kg/h

Back 4

a. 232.7 kg/h

Front 5

What type of insulation will most likely be used for HP steam piping?

a. Fiberglass.

b. Cloth.

c. Calcium silicate.

d. Refractory fiber.

e. Cellulose.

Back 5

c. Calcium silicate

Front 6

A group of units draining to a common return header:

1. May be trapped as one unit

2. Must be trapped separately

3. Should have a check valve in each line

4. Do not require a trap

a. 1, 2

b. 2, 3

c. 3, 4

d. 1, 3

e. 2, 4.

Back 6

b. 2, 3

Front 7

When metal cladding is used in chemical installations where thereare caustic lines, the insulation is covered or wrapped with _____.

a. Stainless steel

b. Canvas

c. Linen

d. Galvanized tin

e. Aluminum.

Back 7

a. Stainless steel

Front 8

Describe three tasks done on a yearly trap inspection.

1. The trap body and operating parts should be examined forcorrosion, erosion, mechanical wear, etc.

2. All internal parts should be cleaned and worn valves, seats,levers etc., should be replaced, as should cracked buckets,floats or bellows.

3. Check trap housing temperature.

4. All gasket seating surfaces should be thoroughly cleaned andnew gaskets used on reassembly.

a. 1, 2, 3, 4

b. 1, 2

c. 1, 2, 4

d. 1, 2, 3

e. 2, 3, 4.

Back 8

c. 1, 2, 4

Front 9

10. The proper installation of the traps to prevent water hammer in thecondensate system should include:

1. Steam lines properly pitched

2. Drip traps installed after regulating valves

3. Each drainage point equipped with a drip pocket

4. “Y” strainers installed horizontally

a. 1, 2

b. 2, 3

c. 3, 4

d. 1, 3

e. 1, 4.

Back 9

e. 1, 4.

Front 10

11. Piping insulation is normally fabricated in half-cylindrical sections forfitting over the pipe. It is held together by _____ or _____, andthen _____ with _____ _____, _____ or galvanized steel.

a. Glue, tape, covered, fabric, sheeting.

b. Wire, tape, insulated, paint, rock wool, metal.

c. Gravity, weight, pasted, plaster, sheeting.

d. Friction, tightness, closed, paint, tar.

e. Metal wire, bands, covered, sheet metal, aluminum

Back 10

e. Metal wire, bands, covered, sheet metal, aluminum

Front 11

A steam separator may:

1. Not require that a steam trap be used

2. Imparts a whirling motion to the steam

3. Cause the steam to suddenly change direction4. Removes moisture droplets

5. Be called a steam purifier

a. 2, 3, 4, 5

b. 1, 3, 4, 5

c. 1, 2, 3, 4

d. 3, 4, 5

e. 2, 3, 4.

Back 11

a. 2, 3, 4, 5

Front 12

In order to determine the correct size of the trap for an application,it is necessary to calculate the condensate load to be removed bythe trap per:

a. Second

b. Minute

c. Hour

d. Day

e. Month.

Back 12

c. Hour

Front 13

In some systems where the temperature from one condensatestream is _____ than _____, a small _____ is used to _____ thecooler condensate.

a. Much cooler, another stream, steam heat exchanger, heat up.

b. Hotter, water, steam injection, change.

c. Colder, steam, temperature gauge, measure.

d. Smaller, the other, time count, blend.

e. Larger, the other, cooler, heat.

Back 13

a. Much cooler, another stream, steam heat exchanger, heat up

Front 14

If a group of traps drain into a common return header, a _____valve should be installed between the trap and the supply header.

a. Check

b. Globe

c. Gate

d. Controle. Butterfly.

Back 14

a. Check

Front 15

List three purposes of insulation.1. Retains the heat in the hot lines.2. Protects the metal surfaces from rust.3. Prevents the temperature inside the power plant building frombecoming uncomfortably high.4. Insulate hot pipelines to prevent injury to personnel due tocontact with the bare surfaces of the pipe.

a. 2, 3, 4

b. 1, 2, 3

c. 1, 3, 4

d. 1, 2, 4

e. 1, 2, 3, 4.

Back 15

c. 1, 3, 4

Front 16

Centrifugal type steam separators have _____ sets of baffles:

a. 5

b. 4

c. 3

d. 2

e. 1.

Back 16

d. 2

Front 17

The coefficient of thermal conductivity (λ) is defined as the amountof heat that will be:

a. Conducted by a material

b. Transmitted through a material

c. Heald by the material

d. Given up by the material during combustion

e. Absorbed by the material during combustion.

Back 17

b. Transmitted through

Front 18

If the condensate must be lifted to an over head return line themost common type of trap used is the _____ trap.

a. Thermostatic

b. Ball float

c. Inverted bucket

d. Impulse

e. Controlled disc

Back 18

c. Inverted bucket

Front 19

The most positive method to test a trap to ensure it is working is to:

a. Touch the body of the trap

b. Observe the discharge by means of a test valve

c. Check the temperatures of the inlet and outletd. Remove the trap for bench testing

Back 19

b. Observe the discharge by means of a test valve

Front 20

The removal of condensations from a steam line is required in orderto avoid:

1. Water hammer

2. Overheating and wearing of the steam traps

3. Turbine blade erosion

4. Rupture of fittings

5. Increasing the heat content of the steam

a. 1, 2, 3, 4, 5

b. 1, 3, 4, 5

c. 1, 2, 3, 4

d. 1, 3, 4

e. 2, 4, 5.

Back 20

d. 1, 3, 4

Front 21

Insulating blankets are used in various applications including:

1. Expansion joints

2. Valves

3. Steam traps

4. Odd shaped equipment

a. 1, 2, 3, 4

b. 1, 2, 3

c. 1, 3, 4

d. 2, 3, 4

e. 1, 2, 4.

Back 21

a. 1, 2, 3,4

Front 22

Steam traps may be classified into the following types according tothe principle of their operation:

1. Impulse

2. Disk

3. Mechanical

4. Thermostatic

5. Thermodynamic

a. 2, 3, 4, 5

b. 1, 3, 4, 5

c. 1, 2, 3

d. 3, 4, 5

e. 2, 4, 5.

Back 22

d. 3, 4, 5

Front 23

A material suitable for use as insulation should have the followingcharacteristics:

1. High insulating value

2. Long life

3. Corrosive

4. Ability to retain its shape and insulating value when wet

5. Vermin proof

a. 1, 2, 3

b. 1, 2, 3, 4

c. 1, 2, 4, 5

d. 2, 3, 4, 5

e. 3, 4, 5.

Back 23

c. 1, 2, 4, 5

Front 24

Which of the following are mechanical type traps?

1. Ball float trap

2. Disk trap

3. Bellow trap

4. Inverted bucket trap

5. Impulse trap

a. 1, 2, 3, 4, 5

b. 1, 2, 3

c. 1, 2, 4

d. 1, 4

e. 2, 4, 5.

Back 24

d. 1, 4

Front 25

Moisture must be removed from steam lines to prevent:

1. Water hammer

2. overloading the steam traps

3. Turbine erosion

4. Rupture of fittings

5. Increasing the heat content of the steam

a. 1, 2, 3, 4, 5

b. 1, 3, 4, 5

c. 1, 4, 5

d. 1, 3, 4

e. 2, 4, 5.

Back 25

d. 1, 3, 4

Front 26

Asbestos pipe covering can be used for temperatures up to:

a. 650°C

b. 800°C

c. 750°C

d. 500°C

e. 425°C.

Back 26

a. 650°C

Front 27

Steam traps are divided into three classes:

1. Impulse

2. Disk

3. Mechanical

4. Thermostatic

5. Thermodynamic

a. 2, 3, 4, 5

b. 3, 4, 5

c. 1, 2, 3

d. 2, 4, 5

e. 1, 3, 4, 5.

Back 27

b. 3, 4, 5

Front 28

The _____ trap is a thermodynamic type of trap.

a. Impulse

b. Inverted bucket

c. Thermostatic

d. Ball float

e. Liquid expansion

Back 28

a. Impulse

Front 29

The coefficient of heat conductivity (k value), of an insulatingmaterial:

a. Does not change with temperature

b. Is higher for glass fiber than steel

c. Is lower when the material has a large number of microscopicair spaces

d. Is decreased as the number of air spaces in the materialdecreases

e. Is affected by atmospheric pressure.

Back 29

c. Is lower when the material has a large number of microscopic air spaces

Front 30

Before pressurizing a cold steam line, what checks should be madeto ensure that the line is completely drained of condensate?

1. Make sure that the line is completely blocked in at both ends.

2. Slowly open each low point drain on the steam line. Be surethe drain lines are free and clear of any blockage.

3. Open downstream flange.

4. Check that each trap is in service.

5. Ensure all condensate has been drained from the pressurizedside of the steam supply valve.

a. 1, 2, 4, 5

b. 1, 2, 3, 4, 5

c. 1, 2, 5

d. 1, 2

e. 2, 3, 4.

Back 30

a. 1, 2, 4, 5

Front 31

Water hammer may occur in _____ lines.

1. Steam

2. Water

3. Air

4. Oil

a. 1, 2, 3

b. 2, 3, 4

c. 1, 3, 4

d. 1, 2, 4

e. 1, 2.

Back 31

d. 1, 2, 4

Front 32

In a thermostatic trap, the bellows are usually filled with:

a. Mercury

b. Water

c. Alcohol

d. Carbon dioxide

e. Helium.

Back 32

c. Alcohol

Front 33

The definition of a heat insulating material is:

a. A material that transfers heat readily

b. A material that transfers heat poorly

c. One whose coefficient of heat conductivity is large

d. One that has a small number of tiny air pockets

e. One that eliminates heat loss.

Back 33

b. A material that transfers heat poorly

Front 34

Some of the main features of steam separators are as follows:

1. They cause the steam to suddenly change its direction

2. They impart a whirling motion to the steam3. They use baffles to cause the motion changes

4. They are unnecessary on steam turbine lines5. They are sometimes called steam purifiers

a. 1, 2, 3

b. 1, 2, 3, 4

c. 3, 4, 5

d. 1, 2, 3, 5

e. 2, 3, 5.

Back 34

d. 1, 2, 3, 5

Front 35

Strainers in steam lines are installed:

a. After the trap

b. To reduce steam temperature

c. To remove moisture

d. To prevent water hammer

e. Before the trap.

Back 35

e. Before the trap.

Front 36

Steam separators:

1. Cause the steam to suddenly change its direction

2. Impart a whirling motion to the steam

3. Use baffles to cause the steam flow to change direction

4. Are not required on steam turbine lines

5. Are sometimes called steam purifiers

a. 1, 2, 3

b. 1, 2, 3, 4

c. 3, 4, 5

d. 1, 2, 3, 5

e. 2, 3, 4.

Back 36

d. 1, 2, 3, 5

Front 37

All traps should provide the following:

1. Long life and dependable service

2. Resistance of trap parts to corrosion

3. Efficient venting of air and carbon dioxide

4. Ability to remove suspended impurities from the steam

5. Ability to operate against the back-pressure which will bepresent in the return line

a. 1, 2, 3, 5

b. 1, 2, 3, 4

c. 2, 3, 4, 5

d. 1, 2, 4, 5

e. 1, 3, 4, 5.

Back 37

a. 1, 2, 3, 5

Front 38

The phenomenon of water hammer in pipe lines is caused from:

1. Rapid opening of valves.

2. Rapid condensation of a pocket of steam.

3. Rapid closing of valves.

4. Sudden stopping of a motor driven centrifugal pump.

5. Rapid opening of the check valve.

a. 1, 2, 3, 4

b. 2, 3, 4

c. 3, 4, 5

d. 1, 2, 3

e. 2, 4, 5.

Back 38

a. 1, 2, 3, 4

Front 39

The “k” value of an insulation material:

a. Remains constant at all temperatures

b. Increases with a temperature increase

c. Decreases with a temperature increase

d. Is the same for all materials

e. Increases for low temperature materials

Back 39

c. Decreases with a temperature increase

Front 40

Glass fiber may be used for pipe insulation up to a temperature of:

a. 454°C

b. 595°C

c. 150°C

d. 185°C

e. 212°C.

Back 40

d. 185°C

Front 41

Which of the following traps is a thermodynamic type?

a. Impulse

b. Bellows

c. Ball float

d. Inverted bucket

e. F and T trap.

Back 41

a. Impulse

Front 42

One or more of the following statements may be true with regard toa steam separator:

1. It may render a steam trap unnecessary

2. It imparts a whirling motion to the steam

3. It causes the steam to suddenly change direction

4. It removes moisture and condensed steam droplets

5. It could be called a steam purifier

a. 2, 3, 4, 5

b. 1, 3, 4, 5

c. 1, 2, 3, 4

d. 3, 4, 5

e. 1, 2, 3.

Back 42

a. 2, 3, 4, 5

Front 43

An insulating material may be defined as one which:

a. Transmits heat poorly

b. Transmits heat readily

c. Has no k value

d. Has a small number of microscopic air pockets

e. Eliminates heat loss.

Back 43

a. Transmits heat poorly