Screen Wash

Question 1

Describe screen wash system

Answer 1

Bar racks- big filter for debris
Traveling screens- smaller filters for debris
Screen wash pumps- press for washing screens
Refuse trough- accepts debris washed off screens
Muffin monster- grinds up debris in refuse trough
Traveling screen drive- VFD various speeds 4 screens

Question 2

Precautions and limitations for Screen wash system?

Answer 2

• at least two screen wash pumps avail always
• CWP not operated if more than one of its screens not avail (3 total)
• do not rotate traveling screens w/o spray valves in

Question 3

Auto start for traveling screens?

Auto stop?

Answer 3

Spring/summer. 15 min/ 4 hrs

Fall/winter. 45 min/ 3 hrs

8” d/p

<8” d/p for > 15 min

Question 4

Different speeds of traveling screens?

Answer 4

Low 10 fpm (5.4-ASW)

Hi 20 fpm (10.8-ASW)

Auto/jellyfish 10-30 fpm (5.4-10.8 ASW)