Heating Boiler Feedwater Controls

Front 1

When a boiler equipped with a combination feedwater control and low-water cutoff device shuts down due to a low-water condition
a) the feedwater flow will also stop
b) level must be restored to above the cutoff line before the unit can be restarted
c) it can be restarted by simply resetting the cutoff switch
d) a manual reset switch must be used
e) a prepurge will not be necessary

Back 1

B

Front 2

An electric feeder valve will
a) eliminate the need for a low-water fuel cutoff
b) prevent a low-water trip
c) open before the low-water cutoff line is reached
d) require manual action to open
e) open after the unit trips on low-water

Back 2

C

Front 3

A float operated mechanical feeder valve should
a) be a normally closed valve
b) open just after the low-water cutoff switch opens
c) be located above the water column
d) not be deemed a stand-by device
e) not open until the level is well below the feed pump cut-in level

Back 3

E

Front 4

In nearly all LP steam heating systems the feedwater
a) is usually condensate
b) requires daily close scrutiny of chemical values
c) is a high make-up percentage
d) must be deaerated
e) requires preheating in an economiser

Back 4

A

Front 5

A Hartford loop will
a) eliminate the need for venting a steam heating system
b) ensure continuous circulation of a hot water system
c) prevent steam from entering a steam pressure gage
d) prevent boiler water level from going below the LPWL
e) prevent the draining of an expansion tank

Back 5

D

Front 6

Because of variations in flow rate, nearly all large steam heating plants utilize
a) an economiser
b) a deaerator
c) a condensate receiver
d) multiple boilers
e) steam pressure regulating valves

Back 6

C

Front 7

Heating plants with multiple boilers often have
a) independent boiler feedwater control from a header
b) individual feedwater systems
c) feedwater pressure regulating valves for each boiler
d) separate condensate receivers
e) a common feedwater control valve

Back 7

A

Front 8

Dissolved oxygen in condensate
a) will cause pitting in a boiler
b) can cause pitting on the return lines
c) causes grooving of the condensate lines
d) cannot be removed with chemicals
e) necessitates the installation of a deaerator

Back 8

A

Front 9

Neutralizing amines
a) raise the pH of condensate
b) lower the pH of boiler water
c) eliminate boiler pitting
d) can cause return grooving
e) absorb carbon dioxide

Back 9

A

Front 10

The result of a condensate receiver which is too small could be
a) high boiler water
level(s)
b) loss of condensate to the sewer
c) loss of make-up water
d) unacceptable high steam pressures
e) low make-up water flow rates

Back 10

B

Front 11

A feedwater make-up system should
a) utilize demineralizers
b) utilize a deaerator
c) be able to satisfy normal firing needs
d) always be softened water
e) be able to satisfy the needs of at least one boiler in a multiboiler plant

Back 11

C

Front 12

Equalizing lines on a condensate receiver float chamber
a) will dampen level fluctuations
b) keep receiver level equal to boiler level
c) maintain make-up flow equal to condensate flow
d) eliminate the need for a make-up level control valve
e) maintains equal flow of condensate to multiple boilers

Back 12

A

Front 13

A condensate receiver low level cutoff switch will
a) act to open a make-up solenoid
b) stop the feedpump thereby preventing damage to it
c) act to close boiler fuel
valve(s)
d) sound an alarm
e) cause the make-up valve to close

Back 13

B