Term
| What are the Three Primary Contaminates in Raw Water? |
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Definition
| Dissolved Solids, Suspended Solids, and Dissolved Gases. |
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Term
| What are the Two Sources of Water treatment used in power plant? |
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Definition
| Surface Water and Ground Water. |
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Term
| What are the Two forms of Water treatment used in power plants? |
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Definition
| External Treatment and Internal treatment. |
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Term
| What are the Four reasons we treat Boiler Feed-Water? |
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Definition
1. Prevent Sludge
2. Prevent Scale
3. Prevent Corrosion
4. Prevent Carryover |
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Term
| What are Cations and what are Anions? |
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Definition
| Cations are Positively charged ions, while Anions are Negatively charged ions. |
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Term
| How are Suspended Solids removed from Raw Water? |
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Definition
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Term
| How are Minerals removed from Raw Water? |
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Definition
| De-mineralization which works on the principle that ions can be exchanged. |
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Term
| How are Dissolved Gases gases removed from make-up water/feed-water? |
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Definition
| Clarifiers, Coagulation, Filtration, and De-aeration/Aeration. |
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Term
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Definition
| The logarithm of the reciprocal of the Hydrogen Ion Activity. Simply put: A measure of water's Acidity or Alkalinity. |
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Term
| Is 7.0 on the scale Acidic or Alkaline? |
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Definition
| A 7.0 on the scale is Neutral. |
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Term
| How are chemicals added to the boiler? |
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Definition
| Internally, either by Volatile chemicals or Non-Volatile chemicals. |
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Term
| What is meant by the term "Cycles of Concentration"? |
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Definition
| It indicates the number of times the water in the boiler has Cycled Up. |
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Term
| What P.H. level do we try to maintain in boilers? |
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Definition
| About 11 on the P.H. scale. |
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Term
| What is Foaming and what is Priming? |
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Definition
| Foaming is a layer of foam (bubbles) on the surface of the boiler water due to high alkalinity, high dissolved/suspended solids or the presence of oil or other colloidal solids. Priming is the carry-over of large slugs of water with the steam. |
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Term
| Name some conditions in a boiler that could cause Carry-Over. |
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Definition
| High water level in the boiler and/or Foaming. |
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Term
| What chemicals are used to adjust boiler P.H.? |
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Definition
| Caustic Soda, (Sodium Hydroxide NaOH) and Ammonia (NH3) |
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Term
| Why is sodium Sulfite used in some boilers? |
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Definition
| To remove oxygen from the boiler. It is an Oxygen Scavenger. |
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Term
| How do you Blow-Down a boiler? |
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Definition
1. Find the true water level.
2. Have 1/2 a gauge glass full or better.
3. Open cooling water to blow-down tank.
4. Open quick opening valve or inside valve
5. Open slow opening or outside valve wide
6. Shut the outside or slow closing valve.
7. Close the inside valve or quick closing valve.
8. Check site glass
9. Secure cooling water to blow-down tank |
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Term
| What causes Condensate Return Line Corrosion? |
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Definition
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Term
| Explain the terms Dry Lay-Up and Wet Lay-Up. |
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Definition
Dry Lay-Up: When taking a Boiler offline for about more than Six months one will usually dry out the boiler completely, close all the valves to prevent moisture, and lay trays of moisture-absorbing chemicals in the boiler drum.
Wet Lay-Up: When taking a boiler off-line for less than six months one will close up the boiler and fill it with warm treated water until it is filled to the vent, then the vent will be closed. Then the pressure in the boiler will be maintained slightly above atmospheric pressure. |
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