Water Treatment

Question 1

Scale is caused by:

Scale is treated with:

Scale is tested using:

Answer 1

1. Calcium or magnesium carbonate
2. Caustic soda or phosphate
3. Hardness tests, soap and phosphate

Question 2

Corrosion caused by:

Treated with:

Tested with:

Answer 2

1. Oxygen and carbon dioxide
2. Sodium sulfite (o2 scavenger)
3. Measure residual sulfite

Question 3

Caustic embrittlement is caused by:

Treated with:

Tested by:

Answer 3

1. High alkaline solution that cracks at seams
2. Correct alkaline levels and control blowdowns
3. P alkalinity and M alkalinity

Question 4

Foaming and carryover is caused by:

Treated with:

Test for:

Answer 4

1. High amount of total dissolved solids, high alkalinity or high surface tension.
2. Bottom or surface blowdowns
3. Chlorides and conductivity

Question 5

Causes hardness in boiler water to participate as heavy sludge and is then removed as bottom blowdown

Answer 5

Phosphates

Question 6

Common O2 scavenger

Answer 6

Sodium sulfite

Question 7

Dissolved CO2 causes corrosion in what system?

Answer 7

Condensate system

Question 8

Excess O2 in boiler water indicates what?

Answer 8

Improper operation of deaerating feed water tank

Question 9

What type of waterside deposits are removed by boiling out a boiler

Answer 9

Oil and grease

Question 10

Why is dissolved CO2 in boiler water dangerous?

Answer 10

Forms carbonic acid

Question 11

Return conductivity condensate formula

Answer 11

Rc= makeup conductivity-feed water conductivity/makeup conductivity-condensate conductivity X 100