Referring to the illustration, what would be...

🔍 Key Concepts

• Operation modes of a 15 ppm oily water separator (idle, separation processing, oil discharge, overboard discharge, recirculation) • Function of upper vs. lower oil/water interface probes in automatic control • How interface level sensing triggers valve line-ups between discharge, recirculation, and sludge (oil) discharge

💭 Think About

• On this particular diagram, what does the LOWER interface probe detect, and which valve or mode change does that signal control? • If the lower probe failed and never "saw" the interface, which operation could NOT safely begin because the unit would not know that the oil layer had cleared from a certain level? • Trace the sequence: idle → separation processing → oil discharge → overboard or recirculation. At which transition is the LOWER probe’s confirmation absolutely required?

✅ Before You Answer

• Identify on the illustration which control lines (dashed) originate from the lower probe and which valves or modes they actuate — follow those signal lines carefully. • Confirm at which point in the cycle the system must verify that the oil/water interface has dropped BELOW the lower probe before switching to another mode — that is where a faulty lower probe will block a transition. • Make sure the option you choose matches a transition where losing the lower probe signal would prevent starting the next mode, not stopping a current one.

Referring to the illustration, what would be the result if the lower oil/water interface detection probe became faulty? Illustration GS-0175

The unit would not be able to transition from the overboard discharge mode to the recirculation mode while in the separation processing mode.

The unit would not be able to transition from ending the separation processing mode to initiating the oil discharge mode.

The unit would not be able to come out of the oily-water separator idle mode and begin processing bilge water.

The unit would not be able to transition from ending the oil discharge mode to initiating the separation processing mode.

🔍 Key Concepts

💭 Think About

✅ Before You Answer