In preparation for getting a platform supply vessel underway, what is the primary factor to consider in whether or not pre-lubrication of the main propulsion engines shall be necessary?
• Pre-lubrication purpose: building oil film on bearings before engine rotation • Effects of engine idle/shutdown time on oil draining off bearing surfaces • Difference between oil properties (like viscosity) and operational history (overhaul date, shutdown length)
• Which condition most affects whether an oil film is still present on critical bearing surfaces before you start turning the engine? • Think about what changes more quickly: oil characteristics, room temperature, overhaul date, or the condition of the oil film on metal surfaces when the engine has been stopped. • On a real platform supply vessel, what situation would make you MOST worried about starting a main engine without first circulating lube oil?
• Identify which choice directly relates to how long oil has had to drain away from bearings and surfaces. • Check which options are about engine internal condition right now versus general maintenance history or oil spec sheets. • Ask: In the manufacturer’s starting instructions, which factor is typically mentioned as the trigger for requiring pre-lubrication before start?
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