How will the traveling screen wash system be operated if a TRASH RACK DIFF LEVEL HI alarm is received for 3 of 6 trash racks?
continuous trash rack cleaning is performed
Plant in mode 1, July 12th, slow 1. No screen carryover, wave height approximately 3.5 feet. How is operation of SWT affected?
the emergency spray headers for the A and B screens must be placed in service
All traveling water screens in auto. Large mat of seaweed impacts screens. Shift to FAST 2. Screen diff pressure drops to zero inches. What is the min. time that the screens will remain operating?
36 mins
What is the max time period between auto initiated traveling screen wash operations?
4 hours
“C” traveling screen diff pressure is rapidly increasing. At what screen D/P will the “C” circ water pump trip?
> 36” for 10 seconds
What will cause the FOLLOW screen wash pump to auto start?
9” DP on any traveling screen
What will cause an operating screen wash pump to auto trip?
> 13 psid strainer diff pressure for at least 50 seconds
Which of the following is a trip set point for an operating traveling screen wash pump?
discharge valve not fully open within 155 seconds of pump start
Who must be notified if the screen wash systems fish sprays are taken out of service?
environmental lab
What is the traveling water screen DP trip setpoint lower for the B, C, D, and E circ pompoms than the A and F pumps?
the B, C, D, and E pump bays have service water pumps associated with them
