1. Raw Water System Flush By introducing fresh water into the cooling system, growth of sea life is reduced or eliminated keeping the raw water cooling pipes free to flow maximum water. This is performed every two ( 2 ) months – December through May and every month ( 1 ) June through November January - C March - A May - B June - C July - A August - B September - C October - A November - B

2. Raw Water System Flush 1½” Gated Wye 2 ½” to 1 ½” Reducer 2 ½” 90* Elbow / Female Swivel 1 ½” to 2 ½” Increaser Fresh Water Inlet

3. Use 1 3/4” hose Raw Water System Flush Portside

4. Raw Water System Flush Sea chest valve - P & S Fresh Water Inlet Valve Close Both Sea Chest Valves Open Both Fresh Water Valves

5. Raw Water System Flush Open Close

6. Raw Water System Flush When the sea chest valves are closed you can pump the raw water main dry with the bilge pump The bilge pump prime valve uses the raw water main as a source open

7. Raw Water System Flush Close all overboard valves not being used Add one (1) gallon bleach Turn on fresh water Start and runStart and run both generators for five (5) minutes Check for overboard discharge – this should have a slight bleach odor Generators Only step 1

8. Raw Water System Flush Remove the sea strainer top Remove the screen and clean all debris from the strainer Check for a good seal when replacing the top Commonly found debris Sea strainer P&S With the sea chest closed

9. Raw Water System Flush Main and Pump Engines steps 2 & 3 Close all overboard valves except for the pump engines Do Not run the pump engines – Use house line pressure only Add one (1) gallon bleach and flow fresh water for five (5) minutes Check overboard flow for volume & slight bleach odor Close all overboard valves except for the main engine and VSP units Do Not run the main engines – Use house line pressure only Add one (1) gallon bleach and flow fresh water for five (5) minutes Check overboard flow for volume & slight bleach odor Open all Raw Water (sea water) valves and close all fresh water valves Run generators first – check for overboard flow Add pump engines then main engines – always checking for free overboard water flow There should be four (4) overboard discharges per side

10. Raw Water System Flush Pump Engine Overboard Valve VSP Unit Cooling Overboard Valve

11. Raw Water System Flush Main Engine Overboard Valves

12. Raw Water System Flush With all engines running you should see four (4) overboard Discharges per side: (Bow to Stern) 1.VSP Unit 2.Main Propulsion Engine 3.Pump Engine 4.Generator When complete, run all engines for five minutes checking Temperature and overboard flow.