CW

Question 1

State Max Delta-T for CW

Answer 1

41F Daily

39F monthly average

Question 2

State CW SCW alarm setpoints

Answer 2

4” Alarm
18” UA-53 Alarm
60” CW pump trip, after discharge valve is <25% open

Question 3

List where Bleach can be injected

Answer 3

Intake tunnel
ITS
DTS
CW pump bay
SW pump bay

Question 4

State what CW Lube water supplies

Answer 4

Thrust Bearing oil cooler
Pump Lower Bearing
Pump Packing Gland

Question 5

State What’s needed to start a CW pump

Answer 5

Discharge valve closed
Lube water flows
All water box vacuum breakers closed
No 86 Device or bus undervoltage

Question 6

State what will trip a CW pump

Answer 6

CS to stop
60” on screen DP and Discharge valve <25% open
Bus undervoltage( <70% with 1.5sec TD)
86 device

Question 7

Stat what’s needed to open a CW pump discharge valve

Answer 7

CW pump CS in normal after start
CW pump breaker closed
After 40 second TD valve will open
Or local pushbutton

Question 8

State what’s needed to close a discharge valve

Answer 8

CW pump CS to pump
High screen DP of 60”
Local push button

Question 9

State limitation on 3 CW pumps running to 2 condensers

Answer 9

This is limited to 24hours due to high flow in the condenser tubes

Question 10

State caution on taking CW pump to pull to lock

Answer 10

This will auto stop the CW pump regardless of the discharge valve position.
This prevents back flow through pump from running pumps

Question 11

State limitation on running 1 CW pump with more than 1 waterbox in service

Answer 11

This is to prevent pump runout