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21 Cards in this Set
- Front
- Back
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What is the normal discharge pressure of the block 39 condensate pumps? |
130 - 150 psi |
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What sources do the block 39 tanks receive water from? |
The tanks are filled with demin water and condensate from the caustic plant, and condensate from power 1. |
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What can affect the temperature of the condensate from block 39? |
When caustic is running there is a noticeable increase in water temp to block 39. |
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List how many of each and the rated capacity or % of the following. |
(2) Block 39 tanks - 3,000,000 gallons each. (3) Block 39 condensate pumps - 50% (3) Condensate heaters - 33% (has a bypass) (2) Deaerators and storage tanks - 75% |
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What are the above percentages based on? |
5,000,000 lbs/hr of feed water flow. |
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What system is in place to maintain a minimum flow on the block 39 condensate pumps? How is it actuated? |
The recirculation valve which maintains flow at 875,000 per pump. It's air operated using P3 air. |
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List all places that the Power 3 Block could receive condensate from? |
Block 39, ST5, Cross tie to Power 1 via mov 0110-16 |
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Under what circumstances would the crosstie valve to MUPS 8,9,&10 be used? |
If there is a loss of condensate supply to either block 38 or power 2. Pressure should be monitored on both sides of the valve to ensure no plant gets starved for condensate. The valve will open during a low pressure situation and will have to be reset by water treatment before it can be closed. |
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What actions should the Aux Operator take upon loss of a Block 39 condensate pump? |
Work with CCR to verify the standby pump is started. Check the breaker, burnt smells in the switchgear room, oil in the pump, valve lineup, any signs of physical damage, and burnt smells near the pump. |
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What actions will the Aux Operator take upon loss of the Block 39 recirculation valve? |
The bypass will need to be opened to maintain a flow close to what the point on the faceplate is reading. Adjust according to CCR and troubleshoot valve. |
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What chemical is used to manipulate the conductivity downstream of the condensate Cleanup? |
Aqueous ammonia |
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What is the purpose of measuring conductivity downstream of the condensate Cleanup system? |
Conductivity is measured at the outlet of the cleanup to determine PH of the H2O prior to introduction to the HRSGS |
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What controls the output of the Aqueous ammonia pumps? |
The DCS sends a speed output to the pumps based on a conductivity setpoint downstream of condensate Cleanup system. |
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What are the 3 main purposes do the DA and Storage tank? What pressure are the operated at? At the normal pressure what is the operating temp? What means are used to supply this pressure? |
The purpose of the Deaerators is to preheat condensate, remove dissolved oxygen, and to store condensate prior to use in the HRSG. Our DA'S are operated at 5 psi and 265° by a 30# valve which is set to stay between 40 and 60% and a 235/30# PRV which provides the remaining steam required to keep the pressure. |
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How is it possible for the water in the Deaerator to still be in liquid state even though it has passed it's boiling point of 212? |
Because of the increased pressure. |
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What pressure is the relief set at on the DA'S and what protection is there against a vacuum situation? |
The DA'S are equipped with safeties which are set at 58 psi. There are 6" vacuum breakers on both of the DA storage tanks. |
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What actions can be taken in the event of a high dissolved O2 on the outlet of the DA's? |
The feed water bypass on the condensate heaters can be opened more, also the auxiliary operator could open the vents on the top of the DA a little more. |
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What Deaerators supply suction to what pumps? |
DA #1 - BFP 4,5,6 DA #2 - BFP 1,2,3 |
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What's the normal DA Level? |
100 inches |
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How would you tell if a condensate heater has a leak? |
Will produce a rumbling or rattling sound which will get progressively worse. This should be checked once per shift. This will affect the pressure of the boiler feed water and typically affects the attemperators first. |
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When taking a condensate heater our of service, what should be isolated first? Why? |
Ensure that the higher pressure feed water (tube side) is fully isolated first. If a leak is present in heater isolation of the lower pressure side would allow feed water to over pressure the shell side. Reliefs are set at 250 psi. |
