Disadvantage of sodium hydroxide is?
A. Causes caustic embrittlement of the boiler metal
B. Causes forming
C. Poor for pH control
D. All of the above
E. A and C
Answer: A
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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.
- Corrosion of return lines is caused by?
- Chemical that prevent caustic embrittlement 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