According to the illustrated diesel engine fuel treatment and fuel service systems schematic, what statement is true concerning the valves labeled "4" and "5"? Illustration MO-0077

Question

Accepted Answer

Valves 4 and 5 are closed during normal operation, but when opened will allow one of the HFO purifiers to be used as a backup DO purifier, should the DO purifier become disabled.

Answer

Valves 4 and 5 are closed during normal operation, but when opened will allow the DO purifier to be used as a backup HFO purifier, should one of the HFO purifiers become disabled.

Answer

Valves 4 and 5 are closed during normal operation, but when opened will allow all three purifiers to centrifuge HFO while in series.

Answer

Valves 4 and 5 are closed during normal operation, but when opened will allow all three purifiers to centrifuge HFO while in parallel.

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