Plant Ops Chapter 59

1.

1 point

Temperature relief valves can open on a rise in temperature by the expansion of a wax-filled rod or by the

action of a bi-metal strip

action of a Bourdon tube

melting of a fusible link

melting of the alloy in a fusible plug

action of a bellows

2.

1 point

Do not open the safety valve with the test lever

if there are more than two safety valves on the boiler

if the valve is not vented to the roof

if the pressure is less than 75% working pressure

after 9 p.m. in populated areas

if the valve is less than 2.5 cm inlet diameter

3.

1 point

If, during the testing of a safety valve, the valve does not open, you would first

continue to increase the steam pressure

stop the boiler and notify the boiler branch

take the boiler out of service

try to open the valve with the lifting lever

force it open by striking it with a hammer

4.

1 point

What is the minimum number of safety valves required on a boiler having a heating surface of 42 square metres?

none

three

one

four

two

5.

1 point

If a safety valve is too small then the boiler pressure will

remain at the MAWP

rise 5% above the maximum allowable working pressure

rise to 6% above the MAWP

rise more than 6% above the MAWP

not rise more than 15% above the MAWP

6.

1 point

What is the maximum heating surface for a boiler to have only one safety valve?

47 square metres

19 square metres

36 square metres

28 square metres

75 square metres

7.

1 point

The discharge pipe of a safety valve should be separately supported

because the safety valve is not capable of supporting the mass

so that the valve can be quickly and easily removed

so that drainage of the discharge line can occur

so that allowance for expansion prevents stress on the safety valve

in order to prevent leakage at the joint

8.

1 point

The safety valves on a boiler meet code requirements and are set
to a popping pressure of 1380 kPa. What would be the maximum
permissible pressure rise in the boiler, if the boiler was fired
at full capacity with the main steam stop valve closed?

25 kPa

47 kPa

72.4 kPa

37.5 kPa

82.8 kPa

9.

1 point

If the boiler was fired up with the main steam stop valve closed, the safety valves should ensure that:

the pressure cannot exceed the maximum working pressure by more than 6%

the fuel cut-off will operate

the pressure is never more than the hydrostatic test pressure

the pressure cannot exceed the maximum working pressure by more than 3%

the water glass will not burst with the pressure

10.

1 point

If a boiler has a maximum allowable working pressure of 1000 kPa, what would be the maximum pressure allowed when the safety valve is open?

2500 kPa

1600 kPa

1400 kPa

1060 kPa

2000 kPa

11.

1 point

If a safety valve leaks after a try lever test, the operator should

reduce boiler pressure and call the team leader

fit a gag to the safety valve

reduce the boiler pressure

plug the safety valve outlet

operate the try lever several times to blow away foreign material

12.

1 point

Two safety valves are required on a high pressure steam boiler that has a heating surface larger than

47 square metres

40 square metres

12 square metres

27 square metres

45 square metres

13.

1 point

The popping pressure of a safety valve

cannot be changed

can only be decreased by 5%

can only be increased by 5%

can be changed any amount

can be increased or decreased by up to 5%

14.

1 point

The lip on a safety valve

allows it to close slowly

is only required if the steam is superheated

allows it to "pop" open

supplies a drain lip for condensate to collect on

makes the valve stronger

15.

1 point

If the safety valve starts to leak steam

phone the inspector immediately

break the seal, and tighten down on the spring

pull the test lever and try to clear the seat face

report it to the insurance company

adjust the blowdown of the safety valve

16.

1 point

An agency or code with which fittings must comply with is the

ASME code

Fittings and Boiler Parts Act

Health and Safety code

Plumbing Gas Act

Boiler Repair code

17.

1 point

When performing a safety valve pop test one of the first things to do is

check the popping pressure

notify the chief engineer

verify the accuracy of the applicable steam pressure gage

check the blowdown of the safety valve

notify the boiler inspector

18.

1 point

Boiler fittings

requires only the manufacturer's identity attached

are not regulated by the ASME Codes

must be registered by the government

may be used at the discretion of power plant personnel

are tested by a destructive test

19.

1 point

A safety relief valve is like a safety valve except it

must discharge directly to the atmosphere

may have an isolation valve placed between it and the pressure vessel

does not have a blowdown ring or bottom guides

is prone to leakage

must have greater blowdown

20.

1 point

Testing the safety valve by means of the try lever method is considered good practice when carried out on a

weekly basis

six month basis seat pressure is reached

bi-weekly basis

yearly basis

monthly basis

21.

1 point

A try lever safety valve test will

ensure the closing pressure is correct

indicate that valve capacity is adequate

take approximately 2 seconds

ensure the valve is free to operate

ensure the popping pressure is correct

22.

1 point

Cast iron fittings for a boiler can be deemed to have upper limitations of

1,720 kPa and 232 degrees C

3,000 kPa and 150 degrees C

8,000 kpa and 670 degrees C

1,100 kPa and 173 degrees C

17,200 kPa and 1,100 degrees C

23.

1 point

An operator should check that a boiler safety valve will open at its set pressure by

sending for the inspector to bring his or her test gauge

listening to the alarms of the set pressures

connecting the boiler to an air compressor during shut down and raising the pressure in the boiler until the set pressure is reached

putting a piece of pipe over the lifting lever and lifting the valve off its seat when the seat pressure is reached

increasing the boiler pressure until the valve opens and noting the pressure on the pressure gauge when the valve opened

24.

1 point

Each boiler must have a safety valve, preferably

welded in a horizontal position to the top of the boiler

placed in a pipe system leading from a boiler valve

fitted in a vertical position directly connected to the top of the boiler

at eye level on the front surface of the boiler

fitted securely to a shut-off valve directly connected to the top of the boiler

25.

1 point

A stop valve is allowed between the safety valve and the boiler drum when

a rupture disc is placed between the stop valve and the safety valve

the stop valve is locked open

no stop valves are allowed before or after the safety valve

the stop valve is the quick opening type

there is more than one safety valve

26.

1 point

Safety valves "pop" open because the force of the steam

acts upon a huddling chamber

decreases the force created by the spring

is suddenly increased due to a larger area

acts upon a blowdown ring

increases due to the discharge ports

27.

1 point

If a safety valve fails to open at its popping pressure, you should

raise the pressure

try the lifting lever

shut the boiler down

tap it gently

reface the valve

28.

1 point

The blowdown on a safety valve is adjusted by turning the

inspector's seal

adjusting ring

adjusting nut

valve seat

valve disc

29.

1 point

A blowdown ring on a safety valve is used to

increase the effectiveness of the safety valve

adjust the operating pressure of the valve

increase the life of the cone shaped lip

adjust the blowdown differential

set the opening pressure

30.

1 point

Test levers on safety valves should not be used until the boiler
pressure is at least _________ or more of the safety valves normal
popping pressure.

c) 50%

e) 25%

b) 60%

a) 75%

d) 40%

31.

1 point

What does the boiler inspector install to prevent tampering with a safety valve setting?

a restraining order

a plug

a cover plate

a seal

a gag

32.

1 point

It is necessary to clearly mark or identify valves and fittings so that

the operator knows how it works

the manufacturer's reputation is known

a proper safety inventory can be maintained

strength and material can be applied for a particular use

they can be properly stored in the warehouse