Section Review

Question 1

Where are the stop valves located? What is the purpose of the valves ? Where are the lead lines?

Answer 1

The stop valves are located at the front of the steamer, the purpose is to isolate steam to st84, and the lead lines are on the mid deck upstream of the stop valves

Question 2

What are the two sources of water that you have in the surface condenser?

Answer 2

1. Condensate/polished H20
2. CTW

Question 3

State the hazards to plant personnel when operating around high pressure steam and or hot condensate 

Answer 3

Burns, noise, water hammer

Question 4

State the steps necessary to put the cooling tower water system in service, on the following systems.
A. The a and B vacuum skid (plate and frame)
B. Exciter cooler

Answer 4

A. Open ctw inlet/outlet on E8406A/B. Open inlet/outlet on seal water E-8405A/B.
B. Open inlet/outlet on E – 8409 and vent discharge through tube drains.

Question 5

State where can the contaminated hotwell condensate go when it is dumped?

Answer 5

It’s lined up to the polished water tanks but it can goto the West ditch and condensate tanks

Question 6

State what role the surface condenser has in the hotwell condensate system

Answer 6

Condenses exhaust steam from ST 84 and provides cooling from cooling tower to maintain vacuum

Question 7

Briefly described the function or purpose of each of the following valves.
A. P 8401A suction and discharge valves.
B. P 8401A recirculation valve.
C. P 8401A condensate dump valve.
D. Check valve

Answer 7

A. Isolation valves
B. Maintain hotwell level and flow
C. Dumps on high conductivity
D. Prevents backflow

Question 8

State the purpose of the hotwell makeup condensate line.

Answer 8

Adds polished water to hotwell for st84 start up

Question 9

State the purpose of the oil conditioning system.

Answer 9

Removes water and impurities from oil.

Question 10

Describe the purpose of the jacking oil system.

Answer 10

Provides extra oil pressure to keep the shaft from “sagging” during start up shutdown of st84

Question 11

Describe the operation and function of E-8402.

Answer 11

Condenses gland seal leak off and sends it back to the condenser. gland seal fans provide vacuum to support steam flow

Question 12

State the purpose of E 8402 drain line level switch high

Answer 12

Alarms when high level in gland seal condenser

Question 13

Describe the hazards associated with improper steam line warm-up

Answer 13

Water hammer

Question 14

State what is used for cooling on the vacuum skid?

Answer 14

Aux cooling water

Question 15

State the function of the following items
A. Inter condenser condensate trap
B. Steam jets on vacuum skids

Answer 15

A. Maintains level in inter condenser and returns water to hotwell condenser.
B. Creates vacuum using 300 pound steam establishes/maintains vacuum in condenser.

Question 16

Describe the function of the hydraulic oil on the ST 84 turning gear

Answer 16

Used to control steam control valves, opens stop valves, engages turning gear pinion

Question 17

State the hazards of hydrogen

Answer 17

Highly flammable with oxygen

Question 18

State the hazards of CO2

Answer 18

Asphyxiation

Question 19

State why hydrogen purity in the generator is important

Answer 19

Cooling efficiency keeps from damaging windings and produces more megawatts

Question 20

State hazard involved while performing this job
A. Purging the generator with CO2 from hydrogen.

Answer 20

A. Oxygen displacement/valve alignment.

Question 21

State the results of low hydrogen pressure if it continued to be low

Answer 21

Less cooling, seal oil could get into the generator

Question 22

Explain why the seal oil pressure is run higher than the hydrogen pressure

Answer 22

To trap the hydrogen in the generator

Question 23

State the reason why it’s a good idea to check the hydrogen bank pressure each time you make a round

Answer 23

To ensure adequate supply/identify leaks early

Question 24

Describe the purpose of D 8405 and D 8406

Answer 24

Used to de gas hydrogen/oil mixture from generator oil seals

Question 25

State the control range for the hydrogen to seal oil differential pressure

Answer 25

8-10 psi

Question 26

State the normal control range for the seal oil pressure

Answer 26

70-80 psi

Question 27

List the hazards involved with work being done on the bridge crane

Answer 27

Slip strips and falls, falling debris, electrical shock

Question 28

Explain the purpose of the bridge crane

Answer 28

Assist with turbine outages lifts equipment related to turbine

Question 29

State the permit limits for blowdown water from cooling tower.

Answer 29

7 to 9 pH
0 to 45 TSS
0 to 50 TOC

Question 30

Describe the location of CT 84 blow downs and explain how they are used and controlled

Answer 30

West side of polisher building and it’s controlled on conductivity readings

Question 31

List the tanks and vessels associated with the cooling tower area (detergent, corrosion inhibitor)

Answer 31

Sulfuric acid, bleach and Nalco tanks

Question 32

A. state the upper and lower limits for cooling tower pH
B. list the results of high ph excursion and low ph excursion.

Answer 32

7.5-7.8
Low ph- corrosion of condenser tubes
High pH- plugging of exchanger tubes

Question 33

Explain the procedure for startup of a cooling tower circulating pump and putting the 54 inch cooling tower water header and associated equipment service

Answer 33

First verify cooling tower level, verify proper lineup, check pump oil levels, verify discharge vents and condenser vents open, check discharge valve position is at 20%, verify cooling tower riser is open, start pump, verify sealwater flow, close vents Open discharge 100%, balance risers to fans

Question 34

List the steps for preparing the cooling tower fan for maintenance

Answer 34

Shut down fan, place HOA in off, open switch gear, install fan brake, bump test, hang isolation

Question 35

Explain the established procedure for performing the total chlorine sample analysis

Answer 35

Catch sample, rinse 25 mill bottle, fill 2 25 mil bottles, add reagent, read sample