Power Piping Auxiliary Equipment

Question 1

What type of attemperator would be used if the plant feed water is not pure enough to inject directly into the superheated steam?
A. Non-condensing attemperator.
B. Condensing attemperator.

Answer 1

B. Condensing attemperator.

Question 2

Where is the desuperheater located relative to the plant piping system?

Answer 2

In the steam supply line

Question 3

What is used as a boiler feed water tank in larger plants that have deaerators in the boiler feed Water system?

Answer 3

The receiver tank from the discharge line of the deaerators.

Question 4

What are the two purposes blowdown tanks are used for?

Answer 4

To act as a flash steam vessel and to cool the condensate

Question 5

Where would you expect to have to install in-line boiler water circulating pumps?

Answer 5

On very large water tube boilers with poor gravity circulation

Question 6

What will occur with a constant speed drive pump, if the load throttles in under low fire and conditions?

Answer 6

The pressure will rise

Question 7

How often would the furnace wall in an oil fired boiler need to be cleaned of ash?

Answer 7

Annually

Question 8

Which type of fuels make it necessary to install soot blowers in both the firebox and the flue passes of a boiler?

Answer 8

Coal and pulverized Coke boilers and black liquor burning boilers

Question 9

Under what circumstance with the regulations of the National Plumbing Code of Canada take affect in a plant?

Answer 9

Where there is a physical connection between the process, and the municipal plumbing system

Question 10

What might the consequence be from an overflow of hazardous materials from a spill container?

Answer 10

A full scale soil removal and replacement

Question 11

From what point in the boiler feed water system is the water drawn to feed the attemperator?

Answer 11

The outlet of the economizer

Question 12

What device might be used for turbine temperature control below 440°C on small boilers or boilers with only one super heater?
A. Superheater.
B. Desuperheater
C. Attemperator.

Answer 12

B. Desuperheater.

Question 13

Where would an attemperator be placed if it was used as a temperature controlled device for the reheater?

Answer 13

The reheater inlet line

Question 14

Where is the steam obtained from to feed into a bottom fed deaerator?
A. From a steam pad in the bottom of the feed water storage tank
B. From a steam pad in the top of the feed water storage tank.
C. From the vapour space at the bottom of the feed water storage tank.

Answer 14

B. From a steam pad in the top of the storage tank.

Question 15

At what location should the probes used to collect a sample of the boiler feed water and for injecting chemicals into the tank being installed?

Answer 15

The bottom of the tank

Question 16

What type of pump control is used for the smaller boilers (200 hp or less)?
A. Centrifugal
B. Positive displacement
C. Variable
D. On/off

Answer 16

D. On/off

Question 17

What device is employed to ensure a minimum flow of water through a continuous running pump?

Answer 17

A temperature relief or pressure valve is used.

Question 18

What is the required temperature control range for the controller of a water tempering valve used on the overflow line from a blow down tank?

Answer 18

38°C to 77°C (100°F to 170°F)

Question 19

Where does the condensate go from the automatic dump valves on the pumped condensate return system?

Answer 19

Do either the pump header or drain as required

Question 20

What type of strainer is used at the inlet to the condensate tank pump discharge?

Answer 20

Basket strainer

Question 21

Why does the control valve on the overflow line from a liquid mover operate on a time delay when the tank is being vented?

Answer 21

To prevent filling the mechanical room with steam

Question 22

In cases where there is more flash steam being produced in the traps than can be used in the low temperature steam system, Where is the excess steam vented?

Answer 22

To atmosphere