HVAC 6033 - Introduction to Thermol Heaters and Systems (Chp 19)

Question 1

During shutdown, hot oil heater pilots and main burners are checked for:

A) Temperature
B) Setting
C) Cleanliness
D) Pressure
E) Flame pattern

Answer 1

C) Cleanliness

Question 2

A “hot oil system pump” inlet is located:

A) Level with the surge tank
B) Below the surge tank
C) Inside the surge tank
D) At the side of the tank
E) Above the surge tank

Answer 2

B) Below the surge tank

“hot oil system pump”

Question 3

Low hot oil flow shutdowns (FSDL) are usually installed on the:

A) Surge tank line
B) Pump discharge line
C) Outlet line of the oil heater
D) Pump inlet line
E) Inlet line of the oil heater

Answer 3

C) Outlet line of the oil heater

Question 4

Steam which comes in contact with people is called:

A) Treated steam
B) Disinfected steam
C) Low flow steam
D) Low temperature superheated steam
E) Clean steam

Answer 4

E) Clean steam

Question 5

The kind of pump normally used with a hot oil system is a:

A) Rotary screw pump
B) Conventional, single stage centrifugal pump
C) Regenerative pump
D) Multistage reciprocating pump
E) Sliding vane, volute pump

Answer 5

B) Conventional, single stage centrifugal pump

Question 6

_____ are required to “prevent oil from spreading” beyond the confines of a heater in the event of a ruptured tube.

A) Moats
B) Rails
C) Tunnels
D) Dikes
E) Bypass pipes

Answer 6

D) Dikes

Question 7

The inner walls and floor of a furnace of a fired heater are usually lined with:

A) Refractory brick
B) Pyrex glass
C) Asbestos blocks
D) Fibreglass blocks
E) Ceramic tile

Answer 7

A) Refractory brick

Question 8

A ‘‘high stack temperature in a hot oil heater’’ may be an indication of:

A) An increase in fuel gas flow
B) A low oil flow
C) A ruptured tube
D) A high oil flow
E) Pump cavitation

Answer 8

C) A ruptured tube

NOTE: ‘‘high stack temperature in a hot oil heater’’

Question 9

To avoid start-up difficulties in cold weather a thermal fluid must have:

A) Methanol injected into it periodically
B) A low pour point
C) Antifreeze added to it
D) A dehydration system installed in the surge tank
E) A low fire point

Answer 9

B) A low pour point

Question 10

The “convection tubes” of a typical up-draft model fired heater are located in the:

A) Burner windbox
B) Stack
C) Waterwalls
D) Superheater
E) Breeching

Answer 10

E) Breeching

Question 11

Hot oil convection heaters have an approximate efficiency of:
A) 55 - 65%
B) 85 - 95%
C) 70 - 80%
D) 75 - 85%
E) 80 - 90%

Answer 11

D) 75 - 85%

Question 12

A _____ system uses a thermal fluid in place of steam or water to conduct heat from a central source to other vessels and heating coils in a plant.

A) Hot oil
B) Vapour
C) Gas turbine
D) Cooling
E) Condensing

Answer 12

A) Hot oil

Question 13

The initial fill of a hot oil system surge tank is done by:

A) Bucket brigade
B) Bulk truck
C) Use of a vacuum pump
D) Field pressure
E) Pipe line

Answer 13

B) Bulk truck

Question 14

The ‘‘automatic shutdown devices on a hot oil’’ system are called:

A) Circuit breakers
B) Fail safe locks
C) Lock-ups
D) Interlocks
E) Locksmiths

Answer 14

D) Interlocks

‘‘automatic shutdown devices on a hot oil’’

Question 15

Overheated oil in fired heater’s tubes breaks down to form:

A) Coke
B) Carbonic acid
C) Clinkers
D) Ash
E) Paraffin

Answer 15

A) Coke

Question 16

Blanket Gas is used in storage tanks to prevent contact between the liquids and their vapors in the tank and the outside air. The blanket gas is injected in:

A) The radiant section to prevent tubes overheating
B) The vapor space of the surge tank
C) The atmosphere to dilute CO emissions
D) The hot oil heaters to remove coke
E) The flare system

Answer 16

B) The ‘‘vapor space’’ of the surge tank

Note: Blanket Gas