Corrosion of return lines is caused by?
A. Sodium hydroxide and sodium carbonate
B. Sodium phosphate and Sodium sulphite
C. Bicarbonates and phosphates
D. Oxygen and carbon dioxide
E. All of the above
Answer: D
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Power Engineering Chapter 67
- In the phosphate test, what reagent is used?
- In the sodium sulphite test, ___ is added drop by drop until a permanent light blue color is attained.
- Which test uses a device with two electrodes that are immersed in the sample and a voltage is supplied to the electrodes by a means of a battery.
- Which test measures the ability of the water to conduct an electric current?
- In the methyl orange test, if a yellow color is produced then this means that the sample is still alkaline due to __ present.
- In the phenolphthalein test __ is added drop by drop to the water until the pink color disappears.
- The titration test has an accuracy of 10% if the ppm is lower than __ppm.
- The titration test has an accuracy of 2% if the ppm is between __ppm to __ppm.
- Sample line is connected to?
- Sample water passes through a cooler where its temperature is reduced to about __C.
- Chemical that prevent caustic embrittlement is?
- Disadvantage of sodium hydroxide is?
- Hydrazine chemical formula?
- Chemicals used for scale prevention are?
- Chemicals used for sludge conditioning are?
- Chemicals are sold by:
- Caustic acid is?
- Soda ash is?
- Low pressure hot water boilers require:
- A continuous blow-off is
- When performing a water test be sure that:
- Boiler water chemicals are injected
- The phenolphthalein or "P" alkalinity test does not indicate alkalinity due to
- One element which leads to caustic embrittlement in boiler tubes is