18.08 How are filter / polishing units used for multi-tank systems?

Our recommendation is to use an independent filtration – polishing system for each bulk tank. The system minimizes the risk of inadvertent fuel transfer between tanks. And typically it is more economical than adding controls and valves for multiple tank filtration from a single filtration unit.

Where multi-tank systems are required, we recommend the following: (a) actuated ball valves for flow controlwith position monitoring for open and closed position, (b) independent high level sensors for pump shutdown on high level, (c) use of the manual start mode as described in Item 9.07

The system operates to open a fuel supply and fuel return valve for the tank to be filtered, and assure that the valves for the other tanks are closed.